8 Park J, Moon J, Lee S, et al. Structure and CO gas sensing properties of electrospun TiO2 nanofibers. Mater Lett, 2010, 64: 255-257？？
[5]
13 Hsueh T J, Hsu C L, Chang S J, et al. Laterally grown ZnO nanowire ethanol gas sensors. Sens Actuat B, 2007, 126: 473-477？？
[6]
17 Li X Z, Zhang J, Yuan Y W, et al. Effect of electric field on CuO nanoneedle growth during thermal oxidation and its growth mechanism.J Appl Phys, 2010, 108: 024308？？
[7]
18 Park Y W, Seong N J, Jung H J, et al. Growth mechanism of the copper oxide nanowires from copper thin films deposited onCuO-buffered silicon substrate. J Electrochem Soc, 2010, 157: K119-K124
[8]
19 Ding J H, McAvoy T J, Cavicchi R E, et al. Surface state trapping models for SnO2-based microhotplate sensors. Sens Actuat B, 2001, 77:597-613？？
[9]
20 Kim Y S, Hwang I S, KimS J, et al. CuO nanowire gas sensors for air quality control in automotive cabin. Sens Actuat B, 2008, 135:298-303？？
[10]
21 Kolmakov A, Zhang Y, Cheng G, et al. Detection of CO and O2 using tin oxide nanowire sensors. Adv Mater, 2003, 15: 997-1000？？
[11]
22 Chen J, Wang K, Hartman L, et al. H2S detection by vertically aligned CuO nanowire array sensors. J Phys Chem C, 2008, 112:16017-16021？？
[12]
1 Comini E, Faglia G, Sberveglieri G, et al. Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts. Appl PhysLett, 2002, 81: 1869-1871
[13]
2 Liao L, Lu H B, Li J C, et al. The sensitivity of gas sensor based on single ZnO nanowire modulated by helium ion radiation. Appl PhysLett, 2007, 91: 173110
[14]
3 Liao L, Zhang Z, Yan B, et al. Multifunctional CuO nanowire devices: p-type field effect transistors and CO gas sensors. Nanotechnology,2009, 20: 085203？？
10 Kolmakov A, Klenov D O, Lilach Y, et al. Enhanced gas sensing by individual SnO2 nanowires and nanobelts functionalized with Pd catalystparticles. Nano Lett, 2005, 5: 667-673？？
[18]
11 Chang S J, Hsueh T J, Chen I C, et al. Highly sensitive ZnO nanowire CO sensors with the adsorption of Au nanoparticles. Nanotechnology,2008, 19: 175502？？
[19]
12 Liao L, Lu H B, Shuai M, et al. A novel gas sensor based on field ionization from ZnO nanowires: Moderate working voltage and highstability. Nanotechnology, 2008, 19: 175501？？
[20]
14 Jiang X C, Herricks T, Xia Y N. CuO nanowires can be synthesized by heating copper substrates in air. Nano Lett, 2002, 2: 1333-1338？？
[21]
15 Cheng G, Wang S J, Cheng K, et al. The current image of a single CuO nanowire studied by conductive atomic force microscopy. ApplPhys Lett, 2008, 92: 223116？？
[22]
16 Wang L X, Cheng G, Jiang X H, et al. Modulating the surface states of electric field assembled CuO nanowires by electrochemical depositionmethod. Appl Phys Lett, 2009, 95: 083107？？
