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yexuqing木虫之王 (文学泰斗)
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【综合其他】Atomically precise bottom-up fabrication of graphene nanoribbons 已有1人参与
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Atomically precise bottom-up fabrication of graphene nanoribbons Jinming Cai1,7, Pascal Ruffieux1,7, Rached Jaafar1, Marco Bieri1, Thomas Braun1, Stephan Blankenburg1, Matthias Muoth2, Ari P. Seitsonen3,4, Moussa Saleh5, Xinliang Feng5, Klaus Müllen5 & Roman Fasel1,6 Empa, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Laboratory, 3602 Thun and 8600 Dübendorf, Switzerland ETH Zurich, Department of Mechanical and Process Engineering, Micro and Nanosystems, 8092 Zurich, Switzerland University of Zurich, Physical Chemistry Institute, Winterthurerstrasse 190, 8057 Zurich, Switzerland IMPMC, CNRS and Université Pierre et Marie Curie, 4 place Jussieu, case 115, F-75252 Paris, France Max Planck Institute for Polymer Research, Ackermannweg 10, 55124 Mainz, Germany Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland These authors contributed equally to this work. Correspondence to: Roman Fasel1,6 Email: roman.fasel@empa.ch Correspondence to: Klaus Müllen5 Email: muellen@mpip-mainz.mpg.de Top of page Abstract Graphene nanoribbons—narrow and straight-edged stripes of graphene, or single-layer graphite—are predicted to exhibit electronic properties that make them attractive for the fabrication of nanoscale electronic devices1,2,3. In particular, although the two-dimensional parent material graphene4,5 exhibits semimetallic behaviour, quantum confinement and edge effects2,6 should render all graphene nanoribbons with widths smaller than 10 nm semiconducting. But exploring the potential of graphene nanoribbons is hampered by their limited availability: although they have been made using chemical7,8,9, sonochemical10 and lithographic11,12 methods as well as through the unzipping of carbon nanotubes13,14,15,16, the reliable production of graphene nanoribbons smaller than 10 nm with chemical precision remains a significant challenge. Here we report a simple method for the production of atomically precise graphene nanoribbons of different topologies and widths, which uses surface-assisted coupling17,18 of molecular precursors into linear polyphenylenes and their subsequent cyclodehydrogenation19,20. The topology, width and edge periphery of the graphene nanoribbon products are defined by the structure of the precursor monomers, which can be designed to give access to a wide range of different graphene nanoribbons. We expect that our bottom-up approach to the atomically precise fabrication of graphene nanoribbons will finally enable detailed experimental investigations of the properties of this exciting class of materials. It should even provide a route to graphene nanoribbon structures with engineered chemical and electronic properties, including the theoretically predicted intraribbon quantum dots21, superlattice structures22 and magnetic devices based on specific graphene nanoribbon edge states3. To read this story in full you will need to login or make a payment (see right). |
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2楼2010-07-23 10:52:46