期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 177, 期 -, 页码 453-459出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.11.044
关键词
Zinc oxide; Nanowires; Surface modified; Au nanoparticles; Gas sensor
资金
- 973 State Key Project of Fundamental Research for Nanoscience and Nanotechnology [2011CB933700]
- National Nature Science Foundation of China [21105001, 61203212]
- Anhui Provincial Natural Science [10040606Q34]
Long single crystalline ZnO nanowires with an average diameter of 50 nm and lengths of up to 9 mu m were synthesized by a sudden hydrothermal reaction of Zn(NO3)(2)center dot 6H(2)O aqueous solution and NaOH aqueous solution. The formation mechanism of the long ZnO nanowires was studied in detail. In addition, Au nanoparticles were introduced on the surface of ZnO nanowires using a wet-chemical reduction method. Both the long ZnO nanowires and Au-nanoparticle-functionalized ZnO nanowires (Au NPs-ZnO NWs) were applied to fabricate gas sensors for the detection of some organic vapors. The as-fabricated gas sensors exhibit high gas-sensing response, and short response and recovery time. Compared with the ZnO nanowires, the Au NPs-ZnO NWs exhibit a higher response and lower working temperature to some organic vapors, such as ethanol and n-butanol. Such behaviors can be attributed to catalytic activity of Au nanoparticles and Schottky contact at the Au/ZnO interface. (c) 2012 Elsevier B.V. All rights reserved.
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