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TI  High performance ethanol sensing films fabricated from ZnO and In2O3 nanofibers with a double-layer structure
SO  APPLIED SURFACE SCIENCE
LA  English
DT  Article
DE  Semiconductors; Sensitivity; Sensing films; Gas sensors; Chemical sensors
ID  ROOM-TEMPERATURE; HIGH-SENSITIVITY; SNO2; NANOSTRUCTURES; SENSOR; METAL; NO2; NANOPARTICLES; NANOWIRE
AB  ZnO and In2O3 nanofibers are synthesized via electrospinning methods, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), infrared (IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The nanofibers are deposited on ceramic substrates to form sensing films with various structures (ZnO nanofiber films, ZnO-In2O3 nanofiber films, and ZnO-In2O3-ZnO nanofiber films), and their sensing properties are investigated at different temperatures. Compared with ZnO nanofiber films and ZnO-In2O3-ZnO nanofiber films, the obtained ZnO-In2O3 nanofiber films exhibit improved and excellent sensing properties to ethanol. The highest sensitivity (the ratio of sensor resistance in air to that in target ambience) of 25 is obtained when the ZnO-In2O3 films are exposed to 100 ppm ethanol at 210 degrees C, while the corresponding values are only 8 for ZnO nanofiber films at 300 degrees C and 17 for ZnO-In2O3-ZnO nanofiber films at 210 degrees C. Rapid sensing reactions are also obtained as the response and recovery times of ZnO-In2O3 nanofiber films to 100 ppm ethanol are only about 2 and 1 s, respectively. These high sensing performances are explained by referring the heterocontacts formed by the double-layer structure. (C) 2012 Elsevier B. V. All rights reserved.
C1  [Zhang, Xiao-Juan; Qiao, Guan-Jun] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.
[Zhang, Xiao-Juan] Xian Polytech Univ, Sch Sci, Xian 710048, Peoples R China.
RP  Qiao, GJ (reprint author), Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.
EM  guanjunqiao@hotmail.com
FU  National Natural Science Foundation of China[50835007]
FX  The authors thank the National Natural Science Foundation of China (no. 50835007) for supporting this work.
NR  33
TC  0
Z9  0
PU  ELSEVIER SCIENCE BV
PI  AMSTERDAM
PA  PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN  0169-4332
J9  APPL SURF SCI
JI  Appl. Surf. Sci.
PD  JUN 15
PY  2012
VL  258
IS  17
BP  6643
EP  6647
DI  10.1016/j.apsusc.2012.03.098
PG  5
WC  Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
SC  Chemistry; Materials Science; Physics
GA  930BY
UT  WOS:000303112100069
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