Huang, Hui; Gong, Hua; Chow, Chee Lap; Guo, Jun; White, Timothy; Tse, Man Siu; Tan, Ooi Kiang
Uniform SnO2 nanorod arrays have been deposited at low temperature by plasma-enhanced chemical vapor deposition (PECVD). ZnO surface modification is used to improve the selectivity of the SnO2 nanorod sensor to H2 gas. The ZnO-modified SnO2 nanorod sensor shows a normal n-type response to 100 ppm CO, NH3, and CH4 reducing gas whereas it exhibits concentration-dependent n-p-n transitions for its sensing response to H2 gas. This abnormal sensing behavior can be explained by the formation of...[Show more]
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