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纳米前沿刊物Nano Lett 引用次数最多的20篇文章
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原创整理，纳米前沿刊物Nano Lett 引用次数最多的20篇文章 1.Carbon Nanotube Inter- and Intramolecular Logic Gates link V. Derycke, R. Martel, J. Appenzeller, and Ph. Avouris Nano Lett.; 2001; 1(9) pp 453 - 456; (Letter); DOI: 10.1021/nl015606f Abstract：Single wall carbon nanotubes (SWCNTs) have been used as the active channels of field effect transistors (FET). The next development step involves the integration of CNTFETs to form logic gates; the basic units of computers. For this we need to have both p- and n-type CNTFETs. However, without special treatment, the obtained CNTFETs are always p-type: the current carriers are holes and the devices are ON for negative gate bias. Here we show that n-type CNTFETs can be prepared not only by doping but also by a simple annealing of SWNT-based p-FETs in a vacuum. We use our ability to prepare both p- and n-type nanotube transistors to build the first nanotube-based logic gates: voltage inverters. Using spatially resolved doping we implemented this logic function on a single nanotube bundle.  2.Highly Luminescent Monodisperse CdSe and CdSe/ZnS Nanocrystals Synthesized in a Hexadecylamine-Trioctylphosphine Oxide-Trioctylphospine Mixture Link Dmitri V. Talapin, Andrey L. Rogach, Andreas Kornowski, Markus Haase, and Horst Weller Nano Lett.; 2001; 1(4) pp 207 - 211; (Letter); DOI: 10.1021/nl0155126 Abstract:Highly monodisperse CdSe nanocrystals were prepared in a three-component hexadecylamine-trioctylphosphine oxide-trioctylphosphine (HDA-TOPO-TOP) mixture. This modification of the conventional organometallic synthesis of CdSe nanocrystals in TOPO-TOP provides much better control over growth dynamics, resulting in the absence of defocusing of the particle size distribution during growth. The room-temperature quantum efficiency of the band edge luminescence of CdSe nanocrystals can be improved to 40-60% by surface passivation with inorganic (ZnS) or organic (alkylamines) shells. 3. [Block-by-Block Growth of Single-Crystalline Si/SiGe Superlattice Nanowires Yiying Wu, Rong Fan, and Peidong Yang Link：Link Nano Lett.; 2002; 2(2) pp 83 - 86; (Letter); DOI: 10.1021/nl0156888 Abstract:Heterojunction and superlattice formation is essential for many potential applications of semiconductor nanowires in nanoscale optoelectronics. We have developed a hybrid pulsed laser ablation/chemical capor deposition (PLA-CVD) process for the synthesis of semiconductor nanowires with longitudinal ordered heterostructures. The laser ablation process generates a programmable pulsed vapor source, which enables the nanowire growth in a block-by-block fashion with a well-defined compositional profile along the wire axis. Single-crystalline nanowires with longitudinal Si/SiGe superlattice structure have been successfully synthesized. This unique class of heterostructured one-dimensional nanostructures holds great potential in applications such as light emitting devices and thermoelectrics.  4. Crystalline Silver Nanowires by Soft Solution Processing Link Yugang Sun, Byron Gates, Brian Mayers, and Younan Xia Nano Lett.; 2002; 2(2) pp 165 - 168; (Letter); DOI: 10.1021/nl010093y Abstract This paper describes a soft, solution-phase approach to the large-scale synthesis of uniform nanowires of bicrystalline silver whose lateral dimensions could be controlled in the range of 30-40 nm, and lengths up to ~50 m. The first step of this procedure involved the formation of platinum nanoparticles by reducing PtCl2 with ethylene glycol heated to ~160 C. Due to their close match in crystal structure and lattice constants, these platinum nanoparticles could serve as seeds for the heterogeneous nucleation and growth of silver that was produced in the solution via the reduction of AgNO3 with ethylene glycol. When surfactants such as poly(vinyl pyrrolidone) (PVP) were present in this solution, the silver could be directed to grow into uniform nanowires with aspect ratios as high as ~1000. Measurements of transport property at room temperature indicated that these nanowires were electrically continuous with a conductivity of approximately 0.8 × 105 S/cm  5.Hierarchical ZnO Nanostructures Link Jing Yu Lao, Jian Guo Wen, and Zhi Feng Ren Nano Lett.; 2002; 2(11) pp 1287 - 1291; (Letter); DOI: 10.1021/nl025753t Access: Abstract  6.Functionalization of Carbon Nanotubes for Biocompatibility and Biomolecular Recognition http://pubs.acs.org/cgi-bin/abst ... /abs/nl015692j.html Moonsub Shim, Nadine Wong Shi Kam, Robert J. Chen, Yiming Li, and Hongjie Dai Nano Lett.; 2002; 2(4) pp 285 - 288; (Letter); DOI: 10.1021/nl015692j Access: Abstract  7.Spontaneous Polarization-Induced Nanohelixes, Nanosprings, and Nanorings of Piezoelectric Nanobelts http://pubs.acs.org/cgi-bin/abst ... /abs/nl034463p.html Xiang Yang Kong and Zhong Lin Wang Nano Lett.; 2003; 3(12) pp 1625 - 1631; (Letter); DOI: 10.1021/nl034463p Access: Abstract  8.ZnO Nanobridges and Nanonails http://pubs.acs.org/cgi-bin/abst ... /abs/nl025884u.html J. Y. Lao, J. Y. Huang, D. Z. Wang, and Z. F. Ren Nano Lett.; 2003; 3(2) pp 235 - 238; (Letter); DOI: 10.1021/nl025884u Access: Abstract  9.Alternative Routes toward High Quality CdSe Nanocrystals http://pubs.acs.org/cgi-bin/abst ... /abs/nl0155532.html Lianhua Qu, Z. Adam Peng, and Xiaogang Peng Nano Lett.; 2001; 1(6) pp 333 - 337; (Letter); DOI: 10.1021/nl0155532 Access: Abstract  10.High Weight Fraction Surfactant Solubilization of Single-Wall Carbon Nanotubes in Water http://pubs.acs.org/cgi-bin/abst ... /abs/nl025924u.html M. F. Islam, E. Rojas, D. M. Bergey, A. T. Johnson, and A. G. Yodh Nano Lett.; 2003; 3(2) pp 269 - 273; (Letter); DOI: 10.1021/nl025924u Access: Abstract  11.Gallium Nitride Nanowire Nanodevices http://pubs.acs.org/cgi-bin/abst ... /abs/nl015667d.html Yu Huang, Xiangfeng Duan, Yi Cui, and Charles M. Lieber Nano Lett.; 2002; 2(2) pp 101 - 104; (Letter); DOI: 10.1021/nl015667d Access: Abstract  12.Probing the Cytotoxicity of Semiconductor Quantum Dots http://pubs.acs.org/cgi-bin/abst ... /abs/nl0347334.html Austin M. Derfus, Warren C. W. Chan, and Sangeeta N. Bhatia Nano Lett.; 2004; 4(1) pp 11 - 18; (Letter); DOI: 10.1021/nl0347334 Access: Abstract  13.Enzyme-Coated Carbon Nanotubes as Single-Molecule Biosensors http://pubs.acs.org/cgi-bin/abst ... /abs/nl034139u.html Koen Besteman, Jeong-O Lee, Frank G. M. Wiertz, Hendrik A. Heering, and Cees Dekker Nano Lett.; 2003; 3(6) pp 727 - 730; (Letter); DOI: 10.1021/nl034139u Access: Abstract  14.Individually Suspended Single-Walled Carbon Nanotubes in Various Surfactants http://pubs.acs.org/cgi-bin/abst ... /abs/nl034524j.html Valerie C. Moore, Michael S. Strano, Erik H. Haroz, Robert H. Hauge, Richard E. Smalley, Judith Schmidt, and Yeshayahu Talmon Nano Lett.; 2003; 3(10) pp 1379 - 1382; (Letter); DOI: 10.1021/nl034524j Access: Abstract  15.Large-Scale Hexagonal-Patterned Growth of Aligned ZnO Nanorods for Nano-optoelectronics and Nanosensor Arrays Xudong Wang, Christopher J. Summers, and Zhong Lin Wang Nano Lett.; 2004; 4(3) pp 423 - 426; (Letter); DOI: 10.1021/nl035102c Access: Abstract  16.One-dimensional Steeplechase for Electrons Realized M. T. Björk, B. J. Ohlsson, T. Sass, A. I. Persson, C. Thelander, M. H. Magnusson, K. Deppert, L. R. Wallenberg, and L. Samuelson Nano Lett.; 2002; 2(2) pp 87 - 89; (Letter); DOI: 10.1021/nl010099n Access: Abstract  17.Gold Nanoparticle-Based Sensing of "Spectroscopically Silent" Heavy Metal Ions Youngjin Kim, Robert C. Johnson, and Joseph T. Hupp Nano Lett.; 2001; 1(4) pp 165 - 167; (Letter); DOI: 10.1021/nl0100116 Access: Abstract  18.Stabilization of Individual Carbon Nanotubes in Aqueous Solutions Rajdip Bandyopadhyaya, Einat Nativ-Roth, Oren Regev, and Rachel Yerushalmi-Rozen Nano Lett.; 2002; 2(1) pp 25 - 28; (Letter); DOI: 10.1021/nl010065f Access: Abstract  19.High Performance Silicon Nanowire Field Effect Transistors Yi Cui, Zhaohui Zhong, Deli Wang, Wayne U. Wang, and Charles M. Lieber Nano Lett.; 2003; 3(2) pp 149 - 152; (Letter); DOI: 10.1021/nl025875l Access: Abstract  20.Polyol Synthesis of Uniform Silver Nanowires: A Plausible Growth Mechanism and the Supporting Evidence Yugang Sun, Brian Mayers, Thurston Herricks, and Younan Xia Nano Lett.; 2003; 3(7) pp 955 - 960; (Letter); DOI: 10.1021/nl034312m Access: Abstract  [ Last edited by dgf2008 on 2008-10-13 at 18:57 ] |
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Record 1 of 50 Author(s): Wang, XD; Summers, CJ; Wang, ZL Title: Large-scale hexagonal-patterned growth of aligned ZnO nanorods for nano-optoelectronics and nanosensor arrays Source: NANO LETTERS, 4 (3): 423-426 MAR 2004 -------------------------------------------------------------------------------- Record 2 of 50 Author(s): Lin, YH; Lu, F; Tu, Y; Ren, ZF Title: Glucose biosensors based on carbon nanotube nanoelectrode ensembles Source: NANO LETTERS, 4 (2): 191-195 FEB 2004 -------------------------------------------------------------------------------- Record 3 of 50 Author(s): Xiao, XY; Xu, BQ; Tao, NJ Title: Measurement of single molecule conductance: Benzenedithiol and benzenedimethanethiol Source: NANO LETTERS, 4 (2): 267-271 FEB 2004 -------------------------------------------------------------------------------- Record 4 of 50 Author(s): Derfus, AM; Chan, WCW; Bhatia, SN Title: Probing the cytotoxicity of semiconductor quantum dots Source: NANO LETTERS, 4 (1): 11-18 JAN 2004 -------------------------------------------------------------------------------- Record 5 of 50 Author(s): Durkop, T; Getty, SA; Cobas, E; Fuhrer, MS Title: Extraordinary mobility in semiconducting carbon nanotubes Source: NANO LETTERS, 4 (1): 35-39 JAN 2004 -------------------------------------------------------------------------------- Record 6 of 50 Author(s): Hahm, J; Lieber, CM Title: Direct ultrasensitive electrical detection of DNA and DNA sequence variations using nanowire nanosensors Source: NANO LETTERS, 4 (1): 51-54 JAN 2004 -------------------------------------------------------------------------------- Record 7 of 50 Author(s): Kong, XY; Wang, ZL Title: Spontaneous polarization-induced nanohelixes, nanosprings, and nanorings of piezoelectric nanobelts Source: NANO LETTERS, 3 (12): 1625-1631 DEC 2003 -------------------------------------------------------------------------------- Record 8 of 50 Author(s): Lau, KKS; Bico, J; Teo, KBK; Chhowalla, M; Amaratunga, GAJ; Milne, WI; McKinley, GH; Gleason, KK Title: Superhydrophobic carbon nanotube forests Source: NANO LETTERS, 3 (12): 1701-1705 DEC 2003 -------------------------------------------------------------------------------- Record 9 of 50 Author(s): Moore, VC; Strano, MS; Haroz, EH; Hauge, RH; Smalley, RE; Schmidt, J; Talmon, Y Title: Individually suspended single-walled carbon nanotubes in various surfactants Source: NANO LETTERS, 3 (10): 1379-1382 OCT 2003 -------------------------------------------------------------------------------- Record 10 of 50 Author(s): Tao, A; Kim, F; Hess, C; Goldberger, J; He, RR; Sun, YG; Xia, YN; Yang, PD Title: Langmuir-Blodgett silver nanowire monolayers for molecular sensing using surface-enhanced Raman spectroscopy Source: NANO LETTERS, 3 (9): 1229-1233 SEP 2003 -------------------------------------------------------------------------------- Record 11 of 50 Author(s): Weisman, RB; Bachilo, SM Title: Dependence of optical transition energies on structure for single-walled carbon nanotubes in aqueous suspension: An empirical Kataura plot Source: NANO LETTERS, 3 (9): 1235-1238 SEP 2003 -------------------------------------------------------------------------------- Record 12 of 50 Author(s): Whang, D; Jin, S; Wu, Y; Lieber, CM Title: Large-scale hierarchical organization of nanowire arrays for integrated nanosystems Source: NANO LETTERS, 3 (9): 1255-1259 SEP 2003 -------------------------------------------------------------------------------- Record 13 of 50 Author(s): McFarland, AD; Van Duyne, RP Title: Single silver nanoparticles as real-time optical sensors with zeptomole sensitivity Source: NANO LETTERS, 3 (8): 1057-1062 AUG 2003 -------------------------------------------------------------------------------- Record 14 of 50 Author(s): Sun, YG; Mayers, B; Herricks, T; Xia, YN Title: Polyol synthesis of uniform silver nanowires: A plausible growth mechanism and the supporting evidence Source: NANO LETTERS, 3 (7): 955-960 JUL 2003 -------------------------------------------------------------------------------- Record 15 of 50 Author(s): Besteman, K; Lee, JO; Wiertz, FGM; Heering, HA; Dekker, C Title: Enzyme-coated carbon nanotubes as single-molecule biosensors Source: NANO LETTERS, 3 (6): 727-730 JUN 2003 -------------------------------------------------------------------------------- Record 16 of 50 Author(s): Li, J; Ng, HT; Cassell, A; Fan, W; Chen, H; Ye, Q; Koehne, J; Han, J; Meyyappan, M Title: Carbon nanotube nanoelectrode array for ultrasensitive DNA detection Source: NANO LETTERS, 3 (5): 597-602 MAY 2003 -------------------------------------------------------------------------------- Record 17 of 50 Author(s): Sun, YG; Mayers, B; Xia, YN Title: Transformation of silver nanospheres into nanobelts and triangular nanoplates through a thermal process Source: NANO LETTERS, 3 (5): 675-679 MAY 2003 -------------------------------------------------------------------------------- Record 18 of 50 Author(s): Li, D; Xia, YN Title: Fabrication of titania nanofibers by electrospinning Source: NANO LETTERS, 3 (4): 555-560 APR 2003 -------------------------------------------------------------------------------- Record 19 of 50 Author(s): Cui, Y; Zhong, ZH; Wang, DL; Wang, WU; Lieber, CM Title: High performance silicon nanowire field effect transistors Source: NANO LETTERS, 3 (2): 149-152 FEB 2003 -------------------------------------------------------------------------------- Record 20 of 50 Author(s): Kim, W; Javey, A; Vermesh, O; Wang, O; Li, YM; Dai, HJ Title: Hysteresis caused by water molecules in carbon nanotube field-effect transistors Source: NANO LETTERS, 3 (2): 193-198 FEB 2003 -------------------------------------------------------------------------------- Record 21 of 50 Author(s): Lao, JY; Huang, JY; Wang, DZ; Ren, ZF Title: ZnO nanobridges and nanonails Source: NANO LETTERS, 3 (2): 235-238 FEB 2003 -------------------------------------------------------------------------------- Record 22 of 50 Author(s): Islam, MF; Rojas, E; Bergey, DM; Johnson, AT; Yodh, AG Title: High weight fraction surfactant solubilization of single-wall carbon nanotubes in water Source: NANO LETTERS, 3 (2): 269-273 FEB 2003 -------------------------------------------------------------------------------- Record 23 of 50 Author(s): Lao, JY; Wen, JG; Ren, ZF Title: Hierarchical ZnO nanostructures Source: NANO LETTERS, 2 (11): 1287-1291 NOV 2002 -------------------------------------------------------------------------------- Record 24 of 50 Author(s): Chen, SH; Carroll, DL Title: Synthesis and characterization of truncated triangular silver nanoplates Source: NANO LETTERS, 2 (9): 1003-1007 SEP 2002 -------------------------------------------------------------------------------- Record 25 of 50 Author(s): Rosenblatt, S; Yaish, Y; Park, J; Gore, J; Sazonova, V; McEuen, PL Title: High performance electrolyte gated carbon nanotube transistors Source: NANO LETTERS, 2 (8): 869-872 AUG 2002 -------------------------------------------------------------------------------- Record 26 of 50 Author(s): Pastoriza-Santos, I; Liz-Marzan, LM Title: Synthesis of silver nanoprisms in DMF Source: NANO LETTERS, 2 (8): 903-905 AUG 2002 -------------------------------------------------------------------------------- Record 27 of 50 Author(s): Fuhrer, MS; Kim, BM; Durkop, T; Brintlinger, T Title: High-mobility nanotube transistor memory Source: NANO LETTERS, 2 (7): 755-759 JUL 2002 -------------------------------------------------------------------------------- Record 28 of 50 Author(s): Reiss, P; Bleuse, J; Pron, A Title: Highly luminescent CdSe/ZnSe core/shell nanocrystals of low size dispersion Source: NANO LETTERS, 2 (7): 781-784 JUL 2002 -------------------------------------------------------------------------------- Record 29 of 50 Author(s): Sun, YG; Mayers, BT; Xia, YN Title: Template-engaged replacement reaction: A one-step approach to the large-scale synthesis of metal nanostructures with hollow interiors Source: NANO LETTERS, 2 (5): 481-485 MAY 2002 -------------------------------------------------------------------------------- Record 30 of 50 Author(s): Shim, M; Kam, NWS; Chen, RJ; Li, YM; Dai, HJ Title: Functionalization of carbon nanotubes for biocompatibility and biomolecular recognition Source: NANO LETTERS, 2 (4): 285-288 APR 2002 -------------------------------------------------------------------------------- Record 31 of 50 Author(s): Huang, WJ; Taylor, S; Fu, KF; Lin, Y; Zhang, DH; Hanks, TW; Rao, AM; Sun, YP Title: Attaching proteins to carbon nanotubes via diimide-activated amidation Source: NANO LETTERS, 2 (4): 311-314 APR 2002 -------------------------------------------------------------------------------- Record 32 of 50 Author(s): Pompeo, F; Resasco, DE Title: Water solubilization of single-walled carbon nanotubes by functionalization with glucosarnine Source: NANO LETTERS, 2 (4): 369-373 APR 2002 -------------------------------------------------------------------------------- Record 33 of 50 Author(s): Yin, YD; Lu, Y; Sun, YG; Xia, YN Title: Silver nanowires can be directly coated with amorphous silica to generate well-controlled coaxial nanocables of silver/silica Source: NANO LETTERS, 2 (4): 427-430 APR 2002 -------------------------------------------------------------------------------- Record 34 of 50 Author(s): Banerjee, S; Wong, SS Title: Synthesis and characterization of carbon nanotube-nanocrystal heterostructures Source: NANO LETTERS, 2 (3): 195-200 MAR 2002 -------------------------------------------------------------------------------- Record 35 of 50 Author(s): Bandyopadhyaya, R; Nativ-Roth, E; Regev, O; Yerushalmi-Rozen, R Title: Stabilization of individual carbon nanotubes in aqueous solutions Source: NANO LETTERS, 2 (1): 25-28 JAN 2002 -------------------------------------------------------------------------------- Record 36 of 50 Author(s): Wu, YY; Fan, R; Yang, PD Title: Block-by-block growth of single-crystalline Si/SiGe superlattice nanowires Source: NANO LETTERS, 2 (2): 83-86 FEB 2002 -------------------------------------------------------------------------------- Record 37 of 50 Author(s): Bjork, MT; Ohlsson, BJ; Sass, T; Persson, AI; Thelander, C; Magnusson, MH; Deppert, K; Wallenberg, LR; Samuelson, L Title: One-dimensional steeplechase for electrons realized Source: NANO LETTERS, 2 (2): 87-89 FEB 2002 -------------------------------------------------------------------------------- Record 38 of 50 Author(s): Huang, Y; Duan, XF; Cui, Y; Lieber, CM Title: Gallium nitride nanowire nanodevices Source: NANO LETTERS, 2 (2): 101-104 FEB 2002 -------------------------------------------------------------------------------- Record 39 of 50 Author(s): Sun, YG; Gates, B; Mayers, B; Xia, YN Title: Crystalline silver nanowires by soft solution processing Source: NANO LETTERS, 2 (2): 165-168 FEB 2002 -------------------------------------------------------------------------------- Record 40 of 50 Author(s): Norris, DJ; Yao, N; Charnock, FT; Kennedy, TA Title: High-quality manganese-doped ZnSe nanocrystals Source: NANO LETTERS, 1 (1): 3-7 JAN 2001 -------------------------------------------------------------------------------- Record 41 of 50 Author(s): Yeung, LK; Crooks, RM Title: Heck heterocoupling within a dendritic nanoreactor Source: NANO LETTERS, 1 (1): 14-17 JAN 2001 -------------------------------------------------------------------------------- Record 42 of 50 Author(s): Zanchet, D; Micheel, CM; Parak, WJ; Gerion, D; Alivisatos, AP Title: Electrophoretic isolation of discrete Au nanocrystal/DNA conjugates Source: NANO LETTERS, 1 (1): 32-35 JAN 2001 -------------------------------------------------------------------------------- Record 43 of 50 Author(s): Cordente, N; Respaud, M; Senocq, F; Casanove, MJ; Amiens, C; Chaudret, B Title: Synthesis and magnetic properties of nickel nanorods Source: NANO LETTERS, 1 (10): 565-568 OCT 2001 -------------------------------------------------------------------------------- Record 44 of 50 Author(s): Lvov, Y; Antipov, AA; Mamedov, A; Mohwald, H; Sukhorukov, GB Title: Urease encapsulation in nanoorganized microshells Source: NANO LETTERS, 1 (3): 125-128 MAR 2001 -------------------------------------------------------------------------------- Record 45 of 50 Author(s): Kim, YJ; Johnson, RC; Hupp, JT Title: Gold nanoparticle-based sensing of "spectroscopically silent" heavy metal ions Source: NANO LETTERS, 1 (4): 165-167 APR 2001 -------------------------------------------------------------------------------- Record 46 of 50 Author(s): Talapin, DV; Rogach, AL; Kornowski, A; Haase, M; Weller, H Title: Highly luminescent monodisperse CdSe and CdSe/ZnS nanocrystals synthesized in a hexadecylamine-trioctylphosphine oxide-trioctylphospine mixture Source: NANO LETTERS, 1 (4): 207-211 APR 2001 -------------------------------------------------------------------------------- Record 47 of 50 Author(s): Mamedova, NN; Kotov, NA; Rogach, AL; Studer, J Title: Albumin-CdTe nanoparticle bioconjugates: Preparation, structure, and interunit energy transfer with antenna effect Source: NANO LETTERS, 1 (6): 281-286 JUN 2001 -------------------------------------------------------------------------------- Record 48 of 50 Author(s): Qu, LH; Peng, ZA; Peng, XG Title: Alternative routes toward high quality CdSe nanocrystals Source: NANO LETTERS, 1 (6): 333-337 JUN 2001 -------------------------------------------------------------------------------- Record 49 of 50 Author(s): Li, LS; Hu, JT; Yang, WD; Alivisatos, AP Title: Band gap variation of size- and shape-controlled colloidal CdSe quantum rods Source: NANO LETTERS, 1 (7): 349-351 JUL 2001 -------------------------------------------------------------------------------- Record 50 of 50 Author(s): Derycke, V; Martel, R; Appenzeller, J; Avouris, P Title: Carbon nanotube inter- and intramolecular logic gates Source: NANO LETTERS, 1 (9): 453-456 SEP 2001 |
3楼2006-12-20 22:47:03
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Record 1 of 50 Author(s): Wang, XD; Summers, CJ; Wang, ZL Title: Large-scale hexagonal-patterned growth of aligned ZnO nanorods for nano-optoelectronics and nanosensor arrays Source: NANO LETTERS, 4 (3): 423-426 MAR 2004 Keywords Plus: CARBON NANOTUBES; PERIODIC ARRAYS; NANOBELTS; NANOWIRES; SAPPHIRE; LASERS Abstract: An effective approach is demonstrated for growing large-area, hexagonally patterned, aligned ZnO nanorods. The synthesis uses a catalyst template produced by a self-assembled monolayer of submicron spheres and guided vapor-liquid-solid (VLS) growth on a single crystal alumina substrate. The ZnO nanorods have uniform shape and length, align vertically on the substrate, and are distributed according to the pattern defined by the catalyst template. The nanorods grow along [0001] with side surfaces defined by {2110}. This approach opens the possibility of creating patterned one-dimensional nanostructures for applications as sensor arrays, piezoelectric antenna arrays, optoelectronic devices, and interconnects. Addresses: Georgia Inst Technol, Sch Mat Sci & Engn, Ctr Nanosci & Nanotechnol, Atlanta, GA 30332 USA Reprint Address: Wang, ZL, Georgia Inst Technol, Sch Mat Sci & Engn, Ctr Nanosci & Nanotechnol, Atlanta, GA 30332 USA. E-mail Address: zhong.wang@mse.gatech.edu Times Cited: 138 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 2 of 50 Author(s): Lin, YH; Lu, F; Tu, Y; Ren, ZF Title: Glucose biosensors based on carbon nanotube nanoelectrode ensembles Source: NANO LETTERS, 4 (2): 191-195 FEB 2004 Keywords Plus: ELECTROCHEMICAL SENSORS; AMPEROMETRIC BIOSENSORS; SITE DENSITY; ELECTRODES; ARRAYS; MEDIATOR Abstract: This paper describes the development of glucose biosensors based on carbon nanotube (CNT) nanoelectrode ensembles (NEEs) for the selective detection of glucose. Glucose oxidase was covalently immobilized on CNT NEEs via carbodiimide chemistry by forming amide linkages between their amine residues and carboxylic acid groups on the CNT tips. The catalytic reduction of hydrogen peroxide liberated from the enzymatic reaction of glucose oxidase upon the glucose and oxygen on CNT NEEs leads to the selective detection of glucose. The biosensor effectively performs a selective electrochemical analysis of glucose in the presence of common interferents (e.g., acetaminophen, uric and ascorbic acids), avoiding the generation of an overlapping signal from such interferers. Such an operation eliminates the need for permselective membrane barriers or artificial electron mediators, thus greatly simplifying the sensor design and fabrication. Addresses: Pacific NW Natl Lab, Richland, WA 99352 USA; Boston Coll, Chestnut Hill, MA 02467 USA Reprint Address: Lin, YH, Pacific NW Natl Lab, 902 Battelle Blvd, Richland, WA 99352 USA. E-mail Address: Yuehe.Lin@pnl.gov Times Cited: 93 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 3 of 50 Author(s): Xiao, XY; Xu, BQ; Tao, NJ Title: Measurement of single molecule conductance: Benzenedithiol and benzenedimethanethiol Source: NANO LETTERS, 4 (2): 267-271 FEB 2004 Keywords Plus: CURRENT-VOLTAGE CHARACTERISTICS; SCANNING-TUNNELING-MICROSCOPY; ALKANETHIOLATE BILAYERS; ROOM-TEMPERATURE; COULOMB-BLOCKADE; GOLD ATOMS; JUNCTIONS; WIRES; TRANSPORT; NANOSTRUCTURE Abstract: We have studied electron transport properties of benzenedithiol and benzenedimethanethiol covalently bonded to gold electrodes by repeatedly creating a large number of molecular junctions. For each molecule, conductance histogram shows peaks at integer multiples of a fundamental conductance value, which is used to identify the conductance of a single molecule. The conductance values of a benzenedithiol and benzenedimethanethiol are 0.011 G(0) and 0.0006 G(0) (G(0) = 2e(2)/h), respectively. The conductance peaks are broad, which reflects variations in the microscopic details of different molecular junctions. We have also studied electrochemical gate effect. Addresses: Arizona State Univ, Ctr Solid State Elect Res, Tempe, AZ 85287 USA Reprint Address: Tao, NJ, Arizona State Univ, Ctr Solid State Elect Res, Tempe, AZ 85287 USA. E-mail Address: nongjian.tao@asu.edu Times Cited: 95 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 4 of 50 Author(s): Derfus, AM; Chan, WCW; Bhatia, SN Title: Probing the cytotoxicity of semiconductor quantum dots Source: NANO LETTERS, 4 (1): 11-18 JAN 2004 Keywords Plus: CDSE NANOCRYSTALS; IN-VIVO; CELL-INTERACTIONS; CADMIUM TOXICITY; RAT HEPATOCYTES; NANOMATERIALS; CULTURES; SURFACE; MARKER; LABELS Abstract: With their bright, photostable fluorescence, semiconductor quantum dots (QDs) show promise as alternatives to organic dyes for biological labeling. Questions about their potential cytotoxicity, however, remain unanswered. While cytotoxicity of bulk cadmium selenide (CdSe) is well documented, a number of groups have suggested that CdSe QDs are cytocompatible, at least with some immortalized cell lines. Using primary hepatocytes as a liver model, we found that CdSe-core QDs were indeed acutely toxic under certain conditions. Specifically, we found that the cytotoxicity of QDs was modulated by processing parameters during synthesis, exposure to ultraviolet light, and surface coatings. Our data further suggest that cytotoxicity correlates with the liberation of free Cd2+ ions due to deterioration of the CdSe lattice. When appropriately coated, CdSe-core QDs can be rendered nontoxic and used to track cell migration and reorganization in vitro. Our results provide information for design criteria for the use of QDs in vitro and especially in vivo, where deterioration over time may occur. Addresses: Univ Calif San Diego, Dept Bioengn, La Jolla, CA 92093 USA Reprint Address: Bhatia, SN, Univ Calif San Diego, Dept Bioengn, 9500 Gilman Dr,MC 0412, La Jolla, CA 92093 USA. E-mail Address: sbhatia@ucsd.edu Times Cited: 151 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 8 -------------------------------------------------------------------------------- Record 5 of 50 Author(s): Durkop, T; Getty, SA; Cobas, E; Fuhrer, MS Title: Extraordinary mobility in semiconducting carbon nanotubes Source: NANO LETTERS, 4 (1): 35-39 JAN 2004 Keywords Plus: FIELD-EFFECT TRANSISTORS; SINGLE; MEMORY Abstract: Semiconducting carbon nanotube transistors with channel lengths exceeding 300 microns have been fabricated. In these long transistors, carrier transport is diffusive and the channel resistance dominates the transport. Transport characteristics are used to extract the field-effect mobility (79 000 cm(2)/Vs) and estimate the intrinsic mobility (>100 000 cm(2)/Vs) at room temperature. These values exceed those for all known semiconductors, which bodes well for application of nanotubes in high-speed transistors, single- and few-electron memories, and chemical/biochemical sensors. Addresses: Univ Maryland, Dept Phys, College Pk, MD 20742 USA; Univ Maryland, Ctr Superconduct Res, College Pk, MD 20742 USA Reprint Address: Fuhrer, MS, Univ Maryland, Dept Phys, College Pk, MD 20742 USA. E-mail Address: mfuhrer@physics.umd.edu Times Cited: 90 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 6 of 50 Author(s): Hahm, J; Lieber, CM Title: Direct ultrasensitive electrical detection of DNA and DNA sequence variations using nanowire nanosensors Source: NANO LETTERS, 4 (1): 51-54 JAN 2004 Keywords Plus: SILICON NANOWIRES; HYBRIDIZATION; GENE; DEVICES; PNA Abstract: The development of electrically addressable, label-free detectors for DNA and other biological macromolecules has the potential to impact basic biological research as well as screening in medical and bioterrorism applications. Here we report two-terminal silicon nanowire electronic devices that function as ultrasensitive and selective detectors of DNA. The surfaces of the silicon nanowire devices were modified with peptide nucleic acid receptors designed to recognize wild type versus the DeltaF508 mutation site in the cystic fibrosis transmembrane receptor gene. Conductance measurements made while sequentially introducing wild type or mutant DNA samples exhibit a time-dependent conductance increase consistent with the PNA-DNA hybridization and enabled identification of fully complementary versus mismatched DNA samples. Concentration-dependent measurements show that detection can be carried out to at least the tens of femtomolar range. This nanowire-based approach represents a step forward for direct, label-free DNA detection with extreme sensitivity and good selectivity, and could provide a pathway to integrated, high-throughput, multiplexed DNA detection for genetic screening and biothreat detection. Addresses: Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA Reprint Address: Lieber, CM, Harvard Univ, Dept Chem & Biol Chem, 12 Oxford St, Cambridge, MA 02138 USA. Times Cited: 103 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 7 of 50 Author(s): Kong, XY; Wang, ZL Title: Spontaneous polarization-induced nanohelixes, nanosprings, and nanorings of piezoelectric nanobelts Source: NANO LETTERS, 3 (12): 1625-1631 DEC 2003 Keywords Plus: NANOWIRE BUILDING-BLOCKS; CARBON NANOTUBES; SURFACES; CONSTANTS; STABILITY; CIRCUITS; SENSORS Abstract: Growth of (0001) facet-dominated, free-standing, piezoelectric zinc oxide (ZnO) nanostructures is challenged by the divergence of the surface energy due to intrinsic polarization. By controlling growth kinetics, we show the success of growing nanobelt-based novel structures whose surfaces are dominated by the polarized +/- (0001) facets. Owing to the positive and negative ionic charges on the zinc- and oxygen-terminated +/- (0001) surfaces, respectively, a spontaneous polarization is induced across the nanobelt thickness. As a result, right-handed helical nanostructures and nanorings are formed by rolling up single-crystal nanobelts; this phenomenon is attributed to a consequence of minimizing the total energy contributed by spontaneous polarization and elasticity. The polar-surface-dominated ZnO nanobelts are likely to be an ideal system for understanding piezoelectricity and polarization-induced ferroelectricity at nanoscale; and they could have applications as one-dimensional nanoscale sensors, transducers, and resonators. Addresses: Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA Reprint Address: Wang, ZL, Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA. Times Cited: 162 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 7 -------------------------------------------------------------------------------- Record 8 of 50 Author(s): Lau, KKS; Bico, J; Teo, KBK; Chhowalla, M; Amaratunga, GAJ; Milne, WI; McKinley, GH; Gleason, KK Title: Superhydrophobic carbon nanotube forests Source: NANO LETTERS, 3 (12): 1701-1705 DEC 2003 Keywords Plus: CHEMICAL-VAPOR-DEPOSITION; THIN-FILMS; FLUOROCARBON; SURFACES; GROWTH; POLYTETRAFLUOROETHYLENE; POLYMERS; DROPS Abstract: The present study demonstrates the creation of a stable, superhydrophobic surface using the nanoscale roughness inherent in a vertically aligned carbon nanotube forest together with a thin, conformal hydrophobic poly(tetrafluoroethylene) (PTFE) coating on the surface of the nanotubes. Superhydrophobicity is achieved down to the microscopic level where essentially spherical, micrometer-sized water droplets can be suspended on top of the nanotube forest. Addresses: MIT, Dept Chem Engn, Cambridge, MA 02139 USA; MIT, Dept Mech Engn, Cambridge, MA 02139 USA; Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England; Rutgers State Univ, Dept Ceram & Mat Engn, Piscataway, NJ 08854 USA Reprint Address: Lau, KKS, MIT, Dept Chem Engn, Cambridge, MA 02139 USA. Times Cited: 118 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 9 of 50 Author(s): Moore, VC; Strano, MS; Haroz, EH; Hauge, RH; Smalley, RE; Schmidt, J; Talmon, Y Title: Individually suspended single-walled carbon nanotubes in various surfactants Source: NANO LETTERS, 3 (10): 1379-1382 OCT 2003 Keywords Plus: BIOMEDICAL APPLICATIONS; POLYMERS; SOLUBILIZATION; ADSORPTION; MACROMERS; WATER Abstract: Individual single-walled carbon nanotubes (SWNTs) have been suspended in aqueous media using various anionic, cationic, nonionic surfactants and polymers. The surfactants are compared with respect to their ability to suspend individual SWNTs and the quality of the absorption and fluorescence spectra. For the ionic surfactants, sodium dodecylbenzene sulfonate (SDBS) gives the most well resolved spectral features. For the nonionic systems, surfactants with higher molecular weight suspend more SWNT material and have more pronounced spectral features. Addresses: Rice Univ, Dept Chem, Rice Quantum Inst, Ctr Nanoscale Sci & Technol, Houston, TX 77005 USA; Rice Univ, Ctr Biol & Environm Nanotechnol, Houston, TX 77005 USA Reprint Address: Smalley, RE, Rice Univ, Dept Chem, Rice Quantum Inst, Ctr Nanoscale Sci & Technol, Houston, TX 77005 USA. Times Cited: 138 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 10 of 50 Author(s): Tao, A; Kim, F; Hess, C; Goldberger, J; He, RR; Sun, YG; Xia, YN; Yang, PD Title: Langmuir-Blodgett silver nanowire monolayers for molecular sensing using surface-enhanced Raman spectroscopy Source: NANO LETTERS, 3 (9): 1229-1233 SEP 2003 Keywords Plus: NANOPARTICLES; SCATTERING; NETWORKS; FILMS; SIZE Abstract: Langmuir-Blodgett technique was used to assemble monolayers (with areas over 20 cm(2)) of aligned silver nanowires that are similar to50 nm in diameter and 2-3 mum in length. These nanowires possess pentagonal cross-sections and pyramidal tips. They are close-packed and are aligned parallel to each other. The resulting nanowire monolayers serve as excellent substrates for surf ace-enhanced Raman spectroscopy (SERS) with large electromagnetic field enhancement factors (2 x 105 for thiol and 2,4-dinitrotoluene, and 2 x 109 for Rhodamine 6G) and can readily be used in ultrasensitive, molecule-specific sensing utilizing vibrational signatures. Addresses: Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA; Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA; Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Yang, PD, Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Times Cited: 110 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 11 of 50 Author(s): Weisman, RB; Bachilo, SM Title: Dependence of optical transition energies on structure for single-walled carbon nanotubes in aqueous suspension: An empirical Kataura plot Source: NANO LETTERS, 3 (9): 1235-1238 SEP 2003 Abstract: Spectrofluorimetric data for identified single-walled carbon nanotubes in aqueous SDS suspension have been accurately fit to empirical expressions. These are used to obtain the first model-independent prediction of first and second van Hove optical transitions as a function of structure for a wide range of semiconducting nanotubes. To allow for convenient use in support of spectral studies, the results are presented in equation, graphical, and tabular forms. These empirical findings differ significantly from Kataura plots computed using a simple tight-binding model. It is suggested that the empirically based results should be used in preference to conventional model-based predictions in spectroscopic nanotube research. Addresses: Rice Univ, Dept Chem, Ctr Nanoscale Sci & Technol, Houston, TX 77005 USA; Rice Univ, Ctr Biol & Environm Nanotechnol, Houston, TX 77005 USA Reprint Address: Weisman, RB, Rice Univ, Dept Chem, Ctr Nanoscale Sci & Technol, 6100 Main St, Houston, TX 77005 USA. Times Cited: 98 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 12 of 50 Author(s): Whang, D; Jin, S; Wu, Y; Lieber, CM Title: Large-scale hierarchical organization of nanowire arrays for integrated nanosystems Source: NANO LETTERS, 3 (9): 1255-1259 SEP 2003 Keywords Plus: CARBON NANOTUBES; BUILDING-BLOCKS; SINGLE; ELECTRONICS; DEVICES; GROWTH Abstract: The assembly of nanowires and nanotubes into arrays patterned on multiple length scales is critical to the realization of integrated electronic and photonic nanotechnologies. A general and efficient solution-based method for controlling organization and hierarchy of nanowire structures over large areas has been developed. Nanowires were aligned with controlled nanometer to micrometer scale pitch using the Langmuir-Blodgett technique and transferred to planar substrates in a layer-by-layer process to form parallel and crossed nanowire structures. The parallel and crossed nanowire structures were efficiently patterned into repeating arrays of controlled dimensions and pitch using photolithography to yield hierarchical structures with order defined from the nanometer through centimeter length scales. In addition, electrical transport studies show that reliable electrical contacts can be made to the hierarchical nanowire arrays prepared by this method. This solution-based process offers a flexible pathway for bottom-up assembly of virtually any nanowire material into highly integrated and hierarchically organized nanodevices needed for a broad range of functional nanosystems. Addresses: Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA; Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA Reprint Address: Lieber, CM, Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA. Times Cited: 107 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 13 of 50 Author(s): McFarland, AD; Van Duyne, RP Title: Single silver nanoparticles as real-time optical sensors with zeptomole sensitivity Source: NANO LETTERS, 3 (8): 1057-1062 AUG 2003 Keywords Plus: SURFACE-PLASMON RESONANCE; SELF-ASSEMBLED MONOLAYERS; METALLIC NANOPARTICLES; NANOSPHERE LITHOGRAPHY; RAMAN-SPECTROSCOPY; ENHANCED RAMAN; GOLD; ADSORPTION; DEPENDENCE; DYNAMICS Abstract: This work utilizes dark-field optical microscopy to demonstrate the localized surface plasmon resonance gamma(max) response of individual Ag nanoparticles to the formation of a monolayer of small-molecule adsorbates. The adsorption of fewer than 60 000 1-hexadecanethiol molecules on single Ag nanoparticles results in a localized surface plasmon resonance shift of 40.7 nm. Additionally, the kinetics of the single nanoparticle response was shown to be comparable to that of other real-time sensor technologies. Addresses: Northwestern Univ, Dept Chem, Evanston, IL 60208 USA Reprint Address: Van Duyne, RP, Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA. Times Cited: 108 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 14 of 50 Author(s): Sun, YG; Mayers, B; Herricks, T; Xia, YN Title: Polyol synthesis of uniform silver nanowires: A plausible growth mechanism and the supporting evidence Source: NANO LETTERS, 3 (7): 955-960 JUL 2003 Keywords Plus: ONE-DIMENSIONAL NANOSTRUCTURES; SHAPE-CONTROLLED SYNTHESIS; SOLUTION-PHASE APPROACH; WET CHEMICAL SYNTHESIS; GOLD NANORODS; ASPECT-RATIO; PARTICLE-SIZE; NANOPARTICLES; NANOCRYSTALS; MONODISPERSE Abstract: We have recently demonstrated an approach based on the polyol process for the large-scale synthesis of silver nanowires with uniform diameters (see Sun, Y.; Gates, B.; Mayers, B.; Xia, Y. Nano Leff. 2002, 2,165. Sun, Y.; Xia, Y. Adv. Mater. 2002, 14,833. Sun, Y.; Yin, Y.; Mayers, B. T.; Herricks, T.; Xia, Y. Chem. Mater. 2002, 149 4736). Although the capability and feasibility of this method have been successfully illustrated with the production of silver nanowires 30-60 nm in diameter and 1-50 mum in length, the growth mechanism of this process is yet to be elucidated. Here we report some progress on this matter: First, electron microscopy studies on microtomed samples indicated that the cross sections of such silver nanowires had a pentagonal shape, together with a 5-fold twinned crystal structure. Second, the side surfaces (bounded by {100} facets) and the ends (bounded by {111} facets) of each nanowire were shown to have significant difference in reactivity toward dithoil molecules, with the side surfaces being completely passivated by poly(vinyl pyrrolidone) (PVP) and the ends being partially passivated (or essentially uncovered) by PVP. This result implied that the PVP macromolecules interacted more strongly with the {100} planes than with the {111} planes of silver. On the basis of these new results, we proposed that each silver nanowire evolved from a multiply twinned nanoparticle (MTP) of silver with the assistance of PVP at the initial stage of the Ostwald ripening process. The anisotropic growth was maintained by selectively covering the {100} facets with PVP while leaving the {111} facets largely uncovered by PVP and thus highly reactive. Addresses: Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Xia, YN, Univ Washington, Dept Chem, Seattle, WA 98195 USA. Times Cited: 124 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 15 of 50 Author(s): Besteman, K; Lee, JO; Wiertz, FGM; Heering, HA; Dekker, C Title: Enzyme-coated carbon nanotubes as single-molecule biosensors Source: NANO LETTERS, 3 (6): 727-730 JUN 2003 Keywords Plus: FUNCTIONALIZATION; RECOGNITION; TRANSISTOR; WIRES Abstract: We demonstrate the use of individual semiconducting single-wall carbon nanotubes as versatile biosensors. Controlled attachment of the redox enzyme glucose oxidase (GOx) to the nanotube sidewall is achieved through a linking molecule and is found to induce a clear change of the conductance. The enzyme-coated tube is found to act as a pH sensor with large and reversible changes in conductance upon changes in pH. Upon addition of glucose, the substrate of GOx, a steplike response can be monitored in real time, indicating that our sensor is also capable of measuring enzymatic activity at the level of a single nanotube. This first demonstration of nanotube-based biosensors provides a new tool for enzymatic studies and opens the way to biomolecular diagnostics. Addresses: Delft Univ Technol, Dept NanoSci, NL-2628 CJ Delft, Netherlands; Delft Univ Technol, DIMES, NL-2628 CJ Delft, Netherlands Reprint Address: Dekker, C, Delft Univ Technol, Dept NanoSci, Lorentzweg 1, NL-2628 CJ Delft, Netherlands. Times Cited: 143 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 16 of 50 Author(s): Li, J; Ng, HT; Cassell, A; Fan, W; Chen, H; Ye, Q; Koehne, J; Han, J; Meyyappan, M Title: Carbon nanotube nanoelectrode array for ultrasensitive DNA detection Source: NANO LETTERS, 3 (5): 597-602 MAY 2003 Keywords Plus: ELECTRON-TRANSFER; ELECTROCHEMISTRY; FABRICATION Abstract: A nanoelectrode array based on vertically aligned multiwalled carbon nanotubes (MWNTs) embedded in SiO2 is used for ultrasensitive DNA detection. Characteristic electrochemical behaviors are observed for measuring bulk and surface-immobilized redox species. Sensitivity is dramatically improved by lowering the nanotube density. Oligonucleotide probes are selectively functionalized to the open ends of nanotubes. The hybridization of subattomole DNA targets can be detected by combining such electrodes with Ru(bpy)(3)(2+) mediated guanine oxidation. Addresses: NASA, Ames Res Ctr, Moffett Field, CA 94035 USA Reprint Address: Li, J, NASA, Ames Res Ctr, Moffett Field, CA 94035 USA. Times Cited: 107 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 17 of 50 Author(s): Sun, YG; Mayers, B; Xia, YN Title: Transformation of silver nanospheres into nanobelts and triangular nanoplates through a thermal process Source: NANO LETTERS, 3 (5): 675-679 MAY 2003 Keywords Plus: SHAPE-CONTROLLED SYNTHESIS; WET CHEMICAL SYNTHESIS; GOLD NANORODS; ASPECT-RATIO; OPTICAL-PROPERTIES; NANOPARTICLES; NANOWIRES; NANORIBBONS; PARTICLES; NANOPRISMS Abstract: Silver has been prepared as triangular nanoplates with sharp corners and thin nanobelts by refluxing an aqueous dispersion of spherical colloids of silver with an average diameter of 3.5 nm. The spherical colloids of silver were, in turn, generated by reducing silver nitrate with sodium borohydride in the presence of poly(vinyl pyrrolidone) (PVP) and sodium citrate. Our studies indicate that the light present in an ordinary chemical laboratory was sufficiently strong to transform some spherical nanoparticles into small triangular nanoplates. Refluxing provided the driving force to facilitate the Ostwald ripening process-growth of these plate-like seeds at the expense of spherical nanoparticles. In addition, refluxing might also selectively disrupt the organic layers on the surfaces of the small triangular nanoplates, driving these plates to assemble into thin nanobelts due to the strong dipole-dipole interaction between adjacent plates. These nanostructures of silver with unique planar shapes might find use in areas that include photonics, optoelectronics, and optical sensing. Addresses: Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Xia, YN, Univ Washington, Dept Chem, Seattle, WA 98195 USA. Times Cited: 107 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 18 of 50 Author(s): Li, D; Xia, YN Title: Fabrication of titania nanofibers by electrospinning Source: NANO LETTERS, 3 (4): 555-560 APR 2003 Keywords Plus: POLYMER TEMPLATE FIBERS; SOL-GEL PROCESS; NANOWIRES; TIO2; NANOTUBES; PRECURSOR; NANOSTRUCTURES; COMPOSITES; ULTRATHIN; NANOBELTS Abstract: This paper describes a procedure based on electrospinning for generating nanofibers of anatase with controllable diameters and porous structures. When an ethanol solution containing both poly(vinyl pyrrolidone) (PVP, M-w approximate to 1300 000) and titanium tetraisopropoxide was injected through a needle under a strong electrical field, composite nanofibers made of PVP and amorphous TiO2 were formed (with lengths up to several centimeters) as a result of electrostatic jetting. These nanofibers could be subsequently converted into anatase without changing their morphology via calcination in air at 500 degreesC. The average diameter of these ceramic nanofibers could be controlled in the range from 20 to 200 nm by varying a number of parameters such as the ratio between PVP and titanium tetraisopropoxide, their concentrations in the alcohol solution, the strength of the electric field, and the feeding rate of the precursor solution. Both supported and free-standing mats consisting of anatase nanofibers have been successfully fabricated. Addresses: Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Xia, YN, Univ Washington, Dept Chem, Seattle, WA 98195 USA. Times Cited: 107 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 19 of 50 Author(s): Cui, Y; Zhong, ZH; Wang, DL; Wang, WU; Lieber, CM Title: High performance silicon nanowire field effect transistors Source: NANO LETTERS, 3 (2): 149-152 FEB 2003 Keywords Plus: CARBON NANOTUBE; SINGLE Abstract: Silicon nanowires can be prepared with single-crystal structures, diameters as small as several nanometers and controllable hole and electron doping, and thus represent powerful building blocks for nanoelectronics devices such as field effect transistors. To explore the potential limits of silicon nanowire transistors, we have examined the influence of source-drain contact thermal annealing and surface passivation on key transistor properties. Thermal annealing and passivation of oxide defects using chemical modification were found to increase the average transconductance from 45 to 800 nS and average mobility from 30 to 560 cm(2)/V(.)s with peak values of 2000 nS and 1350 cm(2)/V(.)s, respectively. The comparison of these results and other key parameters with state-of-the-art planar silicon devices shows substantial advantages for silicon nanowires. The uses of nanowires as building blocks for future nanoelectronics are discussed. Addresses: Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA; Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA Reprint Address: Lieber, CM, Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA. Times Cited: 131 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 20 of 50 Author(s): Kim, W; Javey, A; Vermesh, O; Wang, O; Li, YM; Dai, HJ Title: Hysteresis caused by water molecules in carbon nanotube field-effect transistors Source: NANO LETTERS, 3 (2): 193-198 FEB 2003 Keywords Plus: ROOM-TEMPERATURE; CIRCUITS Abstract: Carbon nanotube field-effect transistors commonly comprise nanotubes lying on SiO2 surfaces exposed to the ambient environment. It is shown here that the transistors exhibit hysteresis in their electrical characteristics because of charge trapping by water molecules around the nanotubes, including SiO2 surface-bound water proximal to the nanotubes. Hysteresis persists for the transistors in vacuum since the SiO2-bound water does not completely desorb in vacuum at room temperature, a known phenomenon in SiO2 surface chemistry. Heating under dry conditions significantly removes water and reduces hysteresis in the transistors. Nearly hysteresis-free transistors are obtainable by passivating the devices with polymers that hydrogen bond with silanol groups on SiO2 (e.g., with poly(methyl methacrylate) (PMMA)). However, nanotube humidity sensors could be explored with suitable water-sensitive coatings. The results may have implications to field-effect transistors made from other chemically derived materials. Addresses: Stanford Univ, Dept Chem, Stanford, CA 94305 USA Reprint Address: Dai, HJ, Stanford Univ, Dept Chem, Stanford, CA 94305 USA. Times Cited: 91 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 21 of 50 Author(s): Lao, JY; Huang, JY; Wang, DZ; Ren, ZF Title: ZnO nanobridges and nanonails Source: NANO LETTERS, 3 (2): 235-238 FEB 2003 Keywords Plus: GROWTH; NANOWIRES; NITRIDE; CARBON; FILMS Abstract: Wurtzite ZnO nanobridges and aligned nanonails have been synthesized by thermal vapor transport and condensation method. The nanobridges have two rows of c-axis ZnO nanorods epitaxailly grown on the edges of the {0001} plane of the ZnO nanobelt. Some variations of the nanobridges have also been observed. The ZnO nanonails, with crystalline cap and small diameter shafts, grow along the c-axis. The shape of the nanonail cap and shaft varies. The nanobridges have very low concentration of indium in the structure and the nanonails are pure ZnO These materials have potential in applications such as optoelectronics, etc. Addresses: Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA Reprint Address: Ren, ZF, Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA. Times Cited: 155 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 22 of 50 Author(s): Islam, MF; Rojas, E; Bergey, DM; Johnson, AT; Yodh, AG Title: High weight fraction surfactant solubilization of single-wall carbon nanotubes in water Source: NANO LETTERS, 3 (2): 269-273 FEB 2003 Keywords Plus: CONTROLLED DEPOSITION; ELECTRONIC-PROPERTIES; PHASE-TRANSITIONS; CATALYTIC GROWTH; FILMS; PURIFICATION; PARTICLES; ORGANIZATION; COMPOSITES; INTERFACE Abstract: We report a simple process to solubilize high weight fraction single-wall carbon nanotubes in water by the nonspecific physical adsorption of sodium dodecylbenzene sulfonate. The diameter distribution of nanotubes in the dispersion, measured by atomic force microscopy, showed that even at 20 mg/mL similar to63 +/- 5% of single-wall carbon nanotube bundles exfoliated into single tubes. A measure of the length distribution of the nanotubes showed that our dispersion technique reduced nanotube fragmentation. Addresses: Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA Reprint Address: Islam, MF, Univ Penn, Dept Phys & Astron, 209 S 33rd St, Philadelphia, PA 19104 USA. Times Cited: 153 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 23 of 50 Author(s): Lao, JY; Wen, JG; Ren, ZF Title: Hierarchical ZnO nanostructures Source: NANO LETTERS, 2 (11): 1287-1291 NOV 2002 Keywords Plus: TRANSPARENT CONDUCTING OXIDES; PHOTOLUMINESCENCE PROPERTIES; NANOWIRE ARRAYS; FILMS; DIODE Abstract: A variety of novel hierarchical nanostructures with 6-, 4-, and 2-fold symmetries have been successfully grown by a vapor transport and condensation technique. It was found that the major core nanowires are single-crystal In2O3 with 6, 4, and 2 facets, and the secondary nanorods are single-crystal hexagonal ZnO and grow either perpendicular on or slanted to all the facets of the core In2O3 nanowires. The core In2O3 nanowires have diameters of about 50-500 nm, whereas the secondary ZnO nanorods have diameters of about 20-200 nm. Depending on the diameter of the core In2O3 nanowires, the secondary ZnO nanorods grow either as a single row or multiple rows. These hierarchical heteronanostructures may find applications in a variety of fields such as field emission, photovoltaics, transparent EMI shielding, supercapacitors, fuel cells, high strength and multifunctional nanocomposites, etc. that require not only high surface area but also structural integrity. Addresses: Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA Reprint Address: Ren, ZF, Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA. Times Cited: 182 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 24 of 50 Author(s): Chen, SH; Carroll, DL Title: Synthesis and characterization of truncated triangular silver nanoplates Source: NANO LETTERS, 2 (9): 1003-1007 SEP 2002 Keywords Plus: SHAPE-CONTROLLED SYNTHESIS; OPTICAL-PROPERTIES; MESOPOROUS SILICA; CARBON NANOTUBES; NANOWIRES; NANOPARTICLES; PARTICLES; GOLD; MONOLAYERS; NANORODS Abstract: Truncated triangular silver nanoplates have been synthesized in large quantities using a solution phase method in the presence of cetyltrimethylammonium bromide micelles. The obtained particles have an average edge size of 68 nm, thickness of 24 nm, and the degree of truncation of 0.35. They are single crystals, with a (111) lattice plane as the basal plane. The aqueous solution of these particles displays a clear red color due to a strong in-plane dipole plasmon resonance peaked at 552 nm. These particles can self-assemble into chainlike nanostructures through either partial or close stacking of neighborhood nanoplates. Addresses: Clemson Univ, Sch Mat Sci & Engn, Lab Nanotechnol, Clemson, SC 29634 USA Reprint Address: Chen, SH, Clemson Univ, Sch Mat Sci & Engn, Lab Nanotechnol, Clemson, SC 29634 USA. Times Cited: 106 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 25 of 50 Author(s): Rosenblatt, S; Yaish, Y; Park, J; Gore, J; Sazonova, V; McEuen, PL Title: High performance electrolyte gated carbon nanotube transistors Source: NANO LETTERS, 2 (8): 869-872 AUG 2002 Keywords Plus: SINGLE-WALL; TRANSPORT; ROPES; WIRES Abstract: We have fabricated high performance field-effect transistors made from semiconducting single-walled carbon nanotubes (SWNTs). Using chemical vapor deposition to grow the tubes, annealing to improve the contacts, and an electrolyte as a gate, we obtain very high device mobilities and transconductances. These measurements demonstrate that SWNTs are attractive for both electronic applications and for chemical and biological sensing. Addresses: Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA; Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA Reprint Address: McEuen, PL, Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA. Times Cited: 98 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 26 of 50 Author(s): Pastoriza-Santos, I; Liz-Marzan, LM Title: Synthesis of silver nanoprisms in DMF Source: NANO LETTERS, 2 (8): 903-905 AUG 2002 Keywords Plus: NANOPARTICLES; REDUCTION Abstract: Polygonal (mainly triangular) silver nanoprisms were synthesized by boiling AgNO3 in N,N-dimethyl formamide, in the presence of poly(vinylpyrrolidone). Although during the synthesis, a mixture of nanoprisms and nanospherolds is formed, the latter can be removed through careful centrifugation. The UV-visible spectra of the nanoprisms display an intense in-plane dipolar plasmon resonance band, as well as weak bands for in-plane and out-of-plane quadrupolar resonances. The nanoprisms are also stable in other solvents, such as ethanol and water, and solvent exchange leads to strong shifts of the in-plane dipole plasmon band. Addresses: Univ Vigo, Dept Quim Fis, Vigo 36200, Spain Reprint Address: Liz-Marzan, LM, Univ Vigo, Dept Quim Fis, Vigo 36200, Spain. Times Cited: 91 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 3 -------------------------------------------------------------------------------- Record 27 of 50 Author(s): Fuhrer, MS; Kim, BM; Durkop, T; Brintlinger, T Title: High-mobility nanotube transistor memory Source: NANO LETTERS, 2 (7): 755-759 JUL 2002 Keywords Plus: SINGLE-ELECTRON MEMORY; CARBON NANOTUBES; ROOM-TEMPERATURE Abstract: A high-mobility (9000 cm(2)/V-s) semiconducting single-walled nanotube transistor is used to construct a nonvolatile charge-storage memory element operating at room temperature. Charges are stored by application of a few volts across the silicon dioxide dielectric between nanotube and silicon substrate, and detected by threshold shift of the nanotube field-effect transistor. The high mobility of the nanotube transistor allows the observation of discrete configurations of charge corresponding to rearrangement of a single or few electrons. These states may be reversibly written, read, and erased at temperatures up to 100 K. Addresses: Univ Maryland, Dept Phys, College Pk, MD 20742 USA Reprint Address: Fuhrer, MS, Univ Maryland, Dept Phys, College Pk, MD 20742 USA. Times Cited: 109 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 28 of 50 Author(s): Reiss, P; Bleuse, J; Pron, A Title: Highly luminescent CdSe/ZnSe core/shell nanocrystals of low size dispersion Source: NANO LETTERS, 2 (7): 781-784 JUL 2002 Keywords Plus: QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; CDSE; CHEMISTRY; CDTE Abstract: A simple synthetic route for the preparation of high-quality CdSe/ZnSe core/shell nanocrystals without the use of any pyrophoric organometallic precursors is presented. Effective surface passivation of monodisperse Use nanocrystals is achieved by overcoating them with a ZnSe shell, applying zinc stearate as a zinc source. The resulting core/shell nanocrystals exhibit high room temperature photoluminescence efficiencies (60-85%) in organic solvents as well as in water after functionalization with mercaptoundecanoic acid (MUA). Addresses: CEA Grenoble, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble 9, France Reprint Address: Reiss, P, CEA Grenoble, Dept Rech Fondamentale Mat Condensee, 17 Rue Martyrs, F-38054 Grenoble 9, France. Times Cited: 114 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 29 of 50 Author(s): Sun, YG; Mayers, BT; Xia, YN Title: Template-engaged replacement reaction: A one-step approach to the large-scale synthesis of metal nanostructures with hollow interiors Source: NANO LETTERS, 2 (5): 481-485 MAY 2002 Keywords Plus: SILVER NANOPARTICLES; CHEMICAL-REACTIONS; PLASMON RESONANCE; COLLOIDAL SILVER; DRUG-DELIVERY; SILICA; PARTICLES; GOLD; ENCAPSULATION; MICROSPHERE Abstract: This paper describes a general approach that generates nanoscale hollow structures of metals by reacting solutions of appropriate salt solutions with solid templates of a more reactive metal. Typical examples include Au3+, Pt2+, and Pd2+ salts and nanoparticles or nanowires of silver. The morphology, void space, and wall thickness of these hollow structures are all determined by the solid templates, which are completely converted into soluble species during the replacement reaction. Both electron microscopy and diffraction studies indicate that single crystalline hollow structures of metals can also be obtained when the templates are single crystals. These metallic hollow structures, having well-controlled sizes and shapes, are expected to find use in a number of applications that involve nanoscale encapsulation, drug delivery, plasmon photonics, and calorimetric sensing. Addresses: Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Xia, YN, Univ Washington, Dept Chem, Seattle, WA 98195 USA. Times Cited: 105 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 30 of 50 Author(s): Shim, M; Kam, NWS; Chen, RJ; Li, YM; Dai, HJ Title: Functionalization of carbon nanotubes for biocompatibility and biomolecular recognition Source: NANO LETTERS, 2 (4): 285-288 APR 2002 Abstract: The interface between biological molecules and novel nanomaterials is important to developing new types of miniature devices for biological applications. Here, the streptavidin/biotin system is used to investigate the adsorption behavior of proteins on the sides of single-walled carbon nanotubes (SWNTs). Functionalization of SWNTs by coadsorption of a surfactant and poly(ethylene glycol) is found to be effective in resisting nonspecific adsorption of streptavidin. Specific binding of streptavidin onto SWNTs is achieved by co-functionalization of nanotubes with biotin and protein-resistant polymers. Addresses: Stanford Univ, Dept Chem, Stanford, CA 94305 USA Reprint Address: Dai, HJ, Stanford Univ, Dept Chem, Stanford, CA 94305 USA. Times Cited: 166 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 31 of 50 Author(s): Huang, WJ; Taylor, S; Fu, KF; Lin, Y; Zhang, DH; Hanks, TW; Rao, AM; Sun, YP Title: Attaching proteins to carbon nanotubes via diimide-activated amidation Source: NANO LETTERS, 2 (4): 311-314 APR 2002 Keywords Plus: BOVINE SERUM-ALBUMIN; IMMOBILIZATION; PURIFICATION; STEP Abstract: Carbon nanotubes are functionalized by bovine serum albumin (BSA) proteins via diimide-activated amidation under ambient conditions. The nanotube-BSA conjugates thus obtained are highly water-soluble, forming dark-colored aqueous solutions. Results from characterizations using atomic force microscopy (AFM), thermal gravimetric analysis, Raman, and gel electrophoresis show that the conjugate samples indeed contain both carbon nanotubes and BSA proteins and that the protein species are intimately associated with the nanotubes. Bioactivities of the nanotube-bound proteins are evaluated using the total protein micro-determination assay (the modified Lowry procedure). The results show that the overwhelming majority (similar to90%) of the protein species in the nanotube-BSA conjugates remain bioactive. Addresses: Clemson Univ, Howard L Hunter Chem Lab, Dept Chem, Clemson, SC 29634 USA; Clemson Univ, Howard L Hunter Chem Lab, Ctr Adv Engn Fibers & Films, Clemson, SC 29634 USA; Furman Univ, Dept Chem, Greenville, SC 29613 USA; Clemson Univ, Dept Phys & Astron, Kinard Lab, Clemson, SC 29634 USA Reprint Address: Huang, WJ, Clemson Univ, Howard L Hunter Chem Lab, Dept Chem, Clemson, SC 29634 USA. Times Cited: 107 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 32 of 50 Author(s): Pompeo, F; Resasco, DE Title: Water solubilization of single-walled carbon nanotubes by functionalization with glucosarnine Source: NANO LETTERS, 2 (4): 369-373 APR 2002 Keywords Plus: OPTICAL-PROPERTIES; OXIDATION Abstract: Water solubilization of single-walled carbon nanotubes (SWNTs) has been achieved by functionalizing the SWNT with glucosamine. The grafting of glucosamine to the nanotubes was attained by producing acyl chloride on the carboxylic groups associated with the nanotubes. Subsequently, amide bonds were formed between the glucosamine and the SWNT. This grafting results in solubility of SWNT in water, which ranges from 0.1 to 0.3 mg/mL, depending on temperature. Addresses: Univ Oklahoma, Sch Chem Engn & Mat Sci, Norman, OK 73019 USA Reprint Address: Resasco, DE, Univ Oklahoma, Sch Chem Engn & Mat Sci, 100 E Boyd St, Norman, OK 73019 USA. Times Cited: 108 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 33 of 50 Author(s): Yin, YD; Lu, Y; Sun, YG; Xia, YN Title: Silver nanowires can be directly coated with amorphous silica to generate well-controlled coaxial nanocables of silver/silica Source: NANO LETTERS, 2 (4): 427-430 APR 2002 Keywords Plus: COLLOIDAL PARTICLES; NANOTUBES; CARBON; TITANIA; NITRIDE; OXIDE Abstract: This paper describes a simple and convenient approach that allowed for the facial synthesis of silver/silica coaxial nanocables with wel-controlled sheath thicknesses in the range of 2-100 nm. The lengths of these nanocables could be up to similar to50 mum. Such nanocables were prepared by directly coating bicrystalline silver nanowires with conformal sheaths of silica through a sol-gel process, The silver nanowires were, in turn, synthesized using a polyol method that involved the reduction of silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone). The thickness of silica coating could be controlled by changing the concentration of the precursor solution and/or the reaction time. Selective removal of the silver cores led to the formation of silica nanotubes having well-controlled dimensions and wall structures. Addresses: Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA; Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Xia, YN, Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA. Times Cited: 93 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 34 of 50 Author(s): Banerjee, S; Wong, SS Title: Synthesis and characterization of carbon nanotube-nanocrystal heterostructures Source: NANO LETTERS, 2 (3): 195-200 MAR 2002 Keywords Plus: CADMIUM SELENIDE NANOCRYSTALS; NANOPARTICLE COMPOSITE FILMS; SEMICONDUCTOR NANOCRYSTALS; SIZE SERIES; II-VI; CHEMISTRY; TIO2; MONOLAYERS; STRENGTH Abstract: Oxidized single-walled carbon nanotubes (SWNTs) have been reacted with cadmium selenide (CdSe) nanocrystals, capped with mercaptothiol derivatives, as well as with titanium dioxide (TiO2) nanocrystals, functionalized with 11-aminoundecanoic acid to form nanoscale heterostructures, characterized by transmission electron microscopy and infrared spectroscopy. The reaction with acid-terminated CdSe nanocrystals and acid-terminated tubes was facilitated with the aid of intermediary linking agents, such as ethylenediamine and semicarbazide, in an amide-forming reaction in the presence of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride, EDC. Based on electronic absorption spectroscopy, charge transfer is thought to proceed from the nanocrystal to the nanotube in the CdSe-nanotube system, whereas in the TiO2-nanotube system, charge transfer is expected to occur from the nanotube to the nanocrystal. Addresses: SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA; Brookhaven Natl Lab, Dept Chem & Mat Sci, Upton, NY 11973 USA Reprint Address: Wong, SS, SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. Times Cited: 94 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 35 of 50 Author(s): Bandyopadhyaya, R; Nativ-Roth, E; Regev, O; Yerushalmi-Rozen, R Title: Stabilization of individual carbon nanotubes in aqueous solutions Source: NANO LETTERS, 2 (1): 25-28 JAN 2002 Keywords Plus: ROPES Abstract: Single-wall carbon nanotubes pack into crystalline ropes that aggregate into tangled networks due to strong van der Waals attraction. Aggregation acts as an obstacle to most applications, and diminishes the special properties of the individual tubes. We describe a simple procedure for dispersing as-produced nanotubes powder in aqueous solutions of Gum Arabic. In a single step, a stable dispersion of full-length, well separated, individual tubes is formed, apparently due to physical adsorption of the polymer. Addresses: Ben Gurion Univ Negev, Dept Chem Engn, IL-84105 Beer Sheva, Israel; Ben Gurion Univ Negev, Ilse Katz Ctr Meso & Nanoscale Sci & Technol, IL-84105 Beer Sheva, Israel Reprint Address: Regev, O, Ben Gurion Univ Negev, Dept Chem Engn, IL-84105 Beer Sheva, Israel. Times Cited: 123 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 36 of 50 Author(s): Wu, YY; Fan, R; Yang, PD Title: Block-by-block growth of single-crystalline Si/SiGe superlattice nanowires Source: NANO LETTERS, 2 (2): 83-86 FEB 2002 Keywords Plus: CARBON NANOTUBES; SI/GE SUPERLATTICES; SILICON NANOWIRES Abstract: Heterojunction and superlattice formation is essential for many potential applications of semiconductor nanowires in nanoscale optoelectronics. We have developed a hybrid pulsed laser ablation/chemical capor deposition (PLA-CVD) process for the synthesis of semiconductor nanowires with longitudinal ordered heterostructures. The laser ablation process generates a programmable pulsed vapor source, which enables the nanowire growth in a block-by-block fashion with a well-defined compositional profile along the wire axis. Single-crystalline nanowires with longitudinal Si/SiGe superlattice structure have been successfully synthesized. This unique class of heterostructured one-dimensional nanostructures holds great potential in applications such as light emitting devices and thermoelectrics. Addresses: Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Div Sci Mat, Berkeley, CA 94720 USA Reprint Address: Yang, PD, Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Div Sci Mat, Berkeley, CA 94720 USA. Times Cited: 221 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 37 of 50 Author(s): Bjork, MT; Ohlsson, BJ; Sass, T; Persson, AI; Thelander, C; Magnusson, MH; Deppert, K; Wallenberg, LR; Samuelson, L Title: One-dimensional steeplechase for electrons realized Source: NANO LETTERS, 2 (2): 87-89 FEB 2002 Keywords Plus: CARBON Abstract: We report growth of one-dimensional semiconductor nanocrystals, nanowhiskers, in which segments of the whisker with different composition are formed, illustrated by InAs whiskers containing segments of InP. Our conditions for growth allow the formation of abrupt interfaces and heterostructure barriers of thickness from a few monolayers to 100s of nanometers, thus creating a one-dimensional landscape along which the electrons move. The crystalline perfection, the quality of the interfaces, and the variation in the lattice constant are demonstrated by high-resolution transmission electron microscopy, and the conduction band off-set of 0.6 eV is deduced from the current due to thermal excitation of electrons over an InP barrier. Addresses: Lund Univ, Solid State Phys Nanometer Consortium, S-22100 Lund, Sweden; Lund Univ, Mat Chem Nanometer Consortium, S-22100 Lund, Sweden Reprint Address: Samuelson, L, Lund Univ, Solid State Phys Nanometer Consortium, Box 118, S-22100 Lund, Sweden. Times Cited: 136 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 3 -------------------------------------------------------------------------------- Record 38 of 50 Author(s): Huang, Y; Duan, XF; Cui, Y; Lieber, CM Title: Gallium nitride nanowire nanodevices Source: NANO LETTERS, 2 (2): 101-104 FEB 2002 Keywords Plus: WALLED CARBON NANOTUBES; GAN Abstract: Field effect transistors (FETs) based on individual GaN nanowires (NWs) have been fabricated. Gate-dependent electrical transport measurements show that the GaN NWs are n-type and that the conductance of NW-FETs can be modulated by more than 3 orders of magnitude. Electron mobilities determined for the GaN NW FETs, which were estimated from the transconductance, were as high as 650 cm(2)/V.s. These mobilities are comparable to or larger than thin film materials with similar carrier concentration and thus demonstrate the high quality of these NW building blocks and their potential for nanoscale electronics. In addition, p-n junctions have been assembled in high yield from p-type Si, and these n-type GaN NWs and their potential applications are discussed. Addresses: Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA 02138 USA Reprint Address: Lieber, CM, Harvard Univ, Dept Chem & Chem Biol, 12 Oxford St, Cambridge, MA 02138 USA. Times Cited: 143 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 39 of 50 Author(s): Sun, YG; Gates, B; Mayers, B; Xia, YN Title: Crystalline silver nanowires by soft solution processing Source: NANO LETTERS, 2 (2): 165-168 FEB 2002 Keywords Plus: CARBON NANOTUBES; GROWTH; REDUCTION; MECHANISM; CHEMISTRY; NANORODS; PHASE; WIRE Abstract: This paper describes a soft, solution-phase approach to the large-scale synthesis of uniform nanowires of bicrystalline silver whose lateral dimensions could be controlled in the range of 30-40 nm, and lengths up to similar to50 mum. The first step of this procedure involved the formation of platinum nanoparticles by reducing PtCl2 With ethylene glycol heated to similar to160 degreesC. Due to their close match in crystal structure and lattice constants, these platinum nanoparticles could serve as seeds for the heterogeneous nucleation and growth of silver that was produced in the solution via the reduction of AgNO3 with ethylene glycol. When surfactants such as poly(vinyl pyrrolldone) (PVP) were present in this solution, the silver could be directed to grow into uniform nanowires with aspect ratios as high as similar to1000. Measurements of transport property at room temperature indicated that these nanowires were electrically continuous with a conductivity of approximately 0.8 X 10(5) S/CM. Addresses: Univ Washington, Dept Chem, Seattle, WA 98195 USA Reprint Address: Xia, YN, Univ Washington, Dept Chem, Seattle, WA 98195 USA. Times Cited: 206 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 40 of 50 Author(s): Norris, DJ; Yao, N; Charnock, FT; Kennedy, TA Title: High-quality manganese-doped ZnSe nanocrystals Source: NANO LETTERS, 1 (1): 3-7 JAN 2001 Keywords Plus: MAGNETIC SEMICONDUCTOR CLUSTERS; QUANTUM DOTS; ABSORPTION; COHERENCE; CD1-YMNYS; CRYSTALS; LIGHT; SPIN; SIZE Abstract: We demonstrate high-quality, highly fluorescent, ZnSe colloidal nanocrystals (or quantum dots) that are doped with paramagnetic Mn2+ impurities. We present luminescence, magnetic circular dichroism (MCD), and electron paramagnetic resonance (EPR) measurements to confirm that the Mn impurities are embedded inside the nanocrystal. Optical measurements show that by exciting the nanocrystal, efficient emission from Mn is obtained, with a quantum yield of 22% at 295 K and 75% below 50 K (relative to Stilbene 420). MCD spectra reveal an experimental Zeeman splitting in the first excited state that is large (28 meV at 2.5 T), depends on doping concentration, and saturates at modest fields. In the low field limit, the magnitude of the effective g factor is 430 times larger than in undoped nanocrystals. EPR experiments exhibit a six-line spectrum with a hyperfine splitting of 60.4 x 10(-4) cm(-1), consistent with Mn substituted at Zn sites in the cubic ZnSe lattice. Addresses: NEC Res Inst, Princeton, NJ 08540 USA; Princeton Univ, Princeton Mat Inst, Princeton, NJ 08540 USA; USN, Res Lab, Washington, DC 20375 USA Reprint Address: Norris, DJ, NEC Res Inst, 4 Independence Way, Princeton, NJ 08540 USA. Times Cited: 90 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 41 of 50 Author(s): Yeung, LK; Crooks, RM Title: Heck heterocoupling within a dendritic nanoreactor Source: NANO LETTERS, 1 (1): 14-17 JAN 2001 Keywords Plus: PERFLUORINATED SOLVENTS; COUPLING REACTIONS; PD NANOPARTICLES; ENCAPSULATED PD; PALLADIUM; CATALYSIS; CHEMISTRY; MICELLES; CLUSTERS Abstract: Palladium nanoparticles (2-3 nm in diameter) have been prepared within covalently functionalized poly(propylene imine) (PPI) dendrimers, and the resulting composite materials are shown to be effective for Heck coupling reactions. Two novel concepts are demonstrated in this report. The first concept involves the incorporation of Pd-0 nanoparticles into PPI dendrimers covalently functionalized with perfluorinated polyether chains on their periphery. The second concept involves the first example of a carbon-carbon coupling reaction catalyzed by a dendrimer-templated nanomaterial, specifically, the catalytic heterocoupling between nonactivated aryl halides and n-butylacrylate mediated by the dendrimer-encapsulated catalysts. These reactions were carried out in a homogeneous fluorous/organic reaction phase at elevated temperature, and the catalyst was recovered by cooling to room temperature and concomitant phase separation. The catalyst was found to be catalytically active at a reaction temperature of only 90degreesC in the absence of toxic phosphines, and it was 100% selective for the production of n-butyl-trans-formylcinnamate with unoptimized isolated yields up to 70%. The recovered catalysts retained a significant fraction of the original activity, comparable to coordination complex catalysts that use a similar catalyst recovery system. Addresses: Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA Reprint Address: Crooks, RM, Texas A&M Univ, Dept Chem, POB 30012, College Stn, TX 77842 USA. Times Cited: 93 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 42 of 50 Author(s): Zanchet, D; Micheel, CM; Parak, WJ; Gerion, D; Alivisatos, AP Title: Electrophoretic isolation of discrete Au nanocrystal/DNA conjugates Source: NANO LETTERS, 1 (1): 32-35 JAN 2001 Keywords Plus: MACROSCOPIC MATERIALS; NANOPARTICLE PROBES; GOLD NANOCRYSTALS; DNA; RECOGNITION Abstract: Colloidal nanocrysta/DNA conjugates hold the promise of becoming powerful probes for biological diagnostics as well as versatile building blocks for nanotechnology. To fully realize this potential, it is important to precisely control the number of oligonucleotides bound to the nanocrystal. Here we demonstrate electrophoretic isolation of 5 and 10 nm gold nanocrystals bearing discrete numbers of single-stranded DNA (1-5). The potential use of these discrete conjugates in the fabrication of novel nanostructures is discussed. Addresses: Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA; Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA Reprint Address: Alivisatos, AP, Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Times Cited: 93 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 43 of 50 Author(s): Cordente, N; Respaud, M; Senocq, F; Casanove, MJ; Amiens, C; Chaudret, B Title: Synthesis and magnetic properties of nickel nanorods Source: NANO LETTERS, 1 (10): 565-568 OCT 2001 Keywords Plus: NANOPARTICLES; COBALT; PARTICLES; IRON; POLY(VINYLPYRROLIDONE); MECHANISM; CLUSTERS Abstract: Nickel nanoparticles of tunable shape have been synthesized in THF, in the presence of hexadecylamine (HDA) or trioctylphosphineoxide (TOPO), in mild conditions and characterized by HREM and SQUID measurements. The formation of nanorods is promoted by a high amine content In the reaction medium. In contrast to what is observed for TOPO-protected nickel particles, the saturation magnetization of HDA-capped nanoparticles is comparable to that of bulk nickel, which demonstrates that the coordination of an amine ligand does not alter the magnetic properties of nickel. Addresses: CNRS, Chim Coordinat Lab, F-31077 Toulouse, France; LPMC, F-31077 Toulouse, France; CIRIMAT, F-31077 Toulouse, France; CNRS, CEMES, F-31055 Toulouse, France Reprint Address: Amiens, C, CNRS, Chim Coordinat Lab, 205 Route Narbonne, F-31077 Toulouse, France. Times Cited: 99 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 44 of 50 Author(s): Lvov, Y; Antipov, AA; Mamedov, A; Mohwald, H; Sukhorukov, GB Title: Urease encapsulation in nanoorganized microshells Source: NANO LETTERS, 1 (3): 125-128 MAR 2001 Keywords Plus: COLLOIDAL PARTICLES; POLYELECTROLYTE CAPSULES; IMMOBILIZED UREASE; MULTILAYERS; ADSORPTION; STABILITY; FILMS; MICROENCAPSULATION; FABRICATION Abstract: Stable hollow polyelectrolyte capsules were produced by means of the layer-by-layer assembling of poly(allylamine), PAH, and poly(styrenesulfonate), PSS, on melamine formaldehyde microcores followed by the core decomposition at low pH. These capsules are nonpermeable for urease in water and become permeable in a water/ethanol mixture. The capsules were loaded with urease in water/ethanol mixture and then resuspended in water. The urease molecules are kept in the capsule, whereas the small urea molecules rapidly diffuse through the capsule wall providing a substrate for the biocatalytic reaction. Addresses: Louisiana Tech Univ, Inst Micromfg, Ruston, LA 71272 USA; Max Planck Inst Colloids & Interfaces, D-14476 Golm Potsdam, Germany; Oklahoma State Univ, Dept Chem, Stillwater, OK 74078 USA Reprint Address: Lvov, Y, Louisiana Tech Univ, Inst Micromfg, Ruston, LA 71272 USA. Times Cited: 105 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 -------------------------------------------------------------------------------- Record 45 of 50 Author(s): Kim, YJ; Johnson, RC; Hupp, JT Title: Gold nanoparticle-based sensing of "spectroscopically silent" heavy metal ions Source: NANO LETTERS, 1 (4): 165-167 APR 2001 Keywords Plus: HYPER-RAYLEIGH SCATTERING; OPTICAL-PROPERTIES; CLUSTERS Abstract: A simple colorimetric technique for the detection of small concentrations of aqueous heavy metal ions, including toxic metals such as lead, cadmium, and mercury, is described. Functionalized gold nanoparticles are aggregated in solution in the presence of divalent metal ions by an ion-templated chelation process; this causes an easily measurable change in the absorption spectrum of the particles. The aggregation also enhances the hyper-Rayleigh scattering (HRS) response from the nanoparticle solutions, providing an inherently more sensitive method of detection. The chelation/aggregation process is reversible via addition of a strong metal ion chelator such as EDTA. Suggestions for improving the sensitivity and selectivity of the technique are given. Addresses: Northwestern Univ, Mat Res Ctr, Dept Chem, Evanston, IL 60208 USA; Northwestern Univ, Ctr Nanofabricat & Mol Self Assembly, Evanston, IL 60208 USA Reprint Address: Hupp, JT, Northwestern Univ, Mat Res Ctr, Dept Chem, Evanston, IL 60208 USA. Times Cited: 123 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 3 -------------------------------------------------------------------------------- Record 46 of 50 Author(s): Talapin, DV; Rogach, AL; Kornowski, A; Haase, M; Weller, H Title: Highly luminescent monodisperse CdSe and CdSe/ZnS nanocrystals synthesized in a hexadecylamine-trioctylphosphine oxide-trioctylphospine mixture Source: NANO LETTERS, 1 (4): 207-211 APR 2001 Keywords Plus: SEMICONDUCTOR NANOCRYSTALS; ELECTROLUMINESCENCE; GROWTH; LIGHT Abstract: Highly monodisperse CdSe nanocrystals were prepared in a three-component hexadecylamine-trioctylphosphine oxide-trioctylphosphine (HDA-TOPO-TOP) mixture. This modification of the conventional organometallic synthesis of Use nanocrystals in TOPO-TOP provides much better control over growth dynamics, resulting in the absence of defocusing of the particle size distribution during growth. The room-temperature quantum efficiency of the band edge luminescence of CdSe nanocrystals can be improved to 40-60% by surface passivation with inorganic (ZnS) or organic (alkylamines) shells. Addresses: Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany Reprint Address: Talapin, DV, Univ Hamburg, Inst Phys Chem, Bundesstr 45, D-20146 Hamburg, Germany. Times Cited: 217 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 47 of 50 Author(s): Mamedova, NN; Kotov, NA; Rogach, AL; Studer, J Title: Albumin-CdTe nanoparticle bioconjugates: Preparation, structure, and interunit energy transfer with antenna effect Source: NANO LETTERS, 1 (6): 281-286 JUN 2001 Keywords Plus: QUANTIZED SEMICONDUCTOR PARTICLES; NANOCRYSTAL SUPERLATTICES; OPTICAL-PROPERTIES; POLYMER-MOLECULES; ELECTRON-TRANSFER; AQUEOUS-SOLUTIONS; METAL-COMPLEXES; SERUM-ALBUMIN; DNA; BINDING Abstract: Conjugates of bovine serum albumin and CdTe nanoparticles capped with L-cysteine have been synthesized via a one-pot glutaric dialdehyde cross-linking procedure. Diads (1:1) with some amount of 2:1 albumin-nanoparticle assemblies preferably form in this reaction, as evidenced by gel electrophoresis. Circular dichroism spectroscopy demonstrates that the tertiary structure of the protein remains largely intact after the conjugation. Attachment of protein moieties result in a significant increase of CdTe emission, which is attributed to the resonance energy transfer from the tryptophan moieties of albumin to CdTe nanoparticles acting as receptors for the protein antennae. Addresses: Oklahoma State Univ, Dept Chem, Stillwater, OK 74078 USA; Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany Reprint Address: Kotov, NA, Oklahoma State Univ, Dept Chem, Stillwater, OK 74078 USA. Times Cited: 99 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 6 -------------------------------------------------------------------------------- Record 48 of 50 Author(s): Qu, LH; Peng, ZA; Peng, XG Title: Alternative routes toward high quality CdSe nanocrystals Source: NANO LETTERS, 1 (6): 333-337 JUN 2001 Keywords Plus: QUANTUM DOTS; II-VI; SURFACE Abstract: Different kinds of safe, common, and low-cost compounds were proven to be good solvents/precursors for the synthesis of high quality CdSe nanocrystals. The size, shape, and crystal structure of CdSe nanocrystals synthesized by these alternative routes can be varied in a controllable manner in a very broad size range, from about 1.5 nm to above 25 nm. Without any size sorting, the size distribution of the wurtzite nanocrystals in the size range smaller than about 15 nm can be readily controlled as narrow as with 5-10% relative standard deviation. The highest photoluminescence quantum efficiency of the nanocrystals was up to 20-30%. Cd(Ac)(2) and fatty acids were found to be the most versatile cadmium precursor and solvent/ligand, respectively. The synthesis of high quality CdSe nanocrystals in the current systems is not feasible when the system contains any anions from a strong acid, either in the form of a cadmium precursor or as an added cadmium ligand. The experimental results indicate that the synthesis of high quality colloidal nanocrystals is far less delicate than it has been thought to be. Addresses: Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA Reprint Address: Peng, XG, Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA. Times Cited: 156 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 5 -------------------------------------------------------------------------------- Record 49 of 50 Author(s): Li, LS; Hu, JT; Yang, WD; Alivisatos, AP Title: Band gap variation of size- and shape-controlled colloidal CdSe quantum rods Source: NANO LETTERS, 1 (7): 349-351 JUL 2001 Keywords Plus: DOTS; NANOCRYSTALS; ABSORPTION; CRYSTALLITES; POLARIZATION; DEPENDENCE; ASSIGNMENT; EXCITON Abstract: We report the band gaps of rodlike CdSe quantum dots with diameter varying from 3.0 to 6.5 nm and length from 7.5 to 40 nm. A qualitative explanation for the dependence of band gap on width and length is presented. Addresses: Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA; Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA Reprint Address: Alivisatos, AP, Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Times Cited: 111 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 3 -------------------------------------------------------------------------------- Record 50 of 50 Author(s): Derycke, V; Martel, R; Appenzeller, J; Avouris, P Title: Carbon nanotube inter- and intramolecular logic gates Source: NANO LETTERS, 1 (9): 453-456 SEP 2001 Keywords Plus: ELECTRONIC-PROPERTIES Abstract: Single wall carbon nanotubes (SWCNTs) have been used as the active channels of field effect transistors (FET). The next development step involves the integration of CNTFETs to form logic gates; the basic units of computers. For this we need to have both p- and n-type CNTFETs. However, without special treatment, the obtained CNTFETs are always p-type: the current carriers are holes and the devices are ON for negative gate bias. Here we show that n-type CNTFETs can be prepared not only by doping but also by a simple annealing of SWNT-based p-FETs in a vacuum. We use our ability to prepare both p- and n-type nanotube transistors to build the first nanotube-based logic gates: voltage inverters. Using spatially resolved doping we implemented this logic function on a single nanotube bundle. Addresses: IBM Corp, Div Res, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA Reprint Address: Avouris, P, IBM Corp, Div Res, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA. Times Cited: 293 Publisher: AMER CHEMICAL SOC Publisher Address: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 29-char Source Abbrev.: NANO LETT ISO Source Abbrev.: Nano Lett. Source Item Page Count: 4 |
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