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Title:
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Low-temperature growth of SnO2 nanorod arrays and tunable n-p-n sensing response of ZnO/SnO2 heterojunction for exclusive hydrogen sensors.
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Author:
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Huang, Hui.; Gong, Hua.; Chow, Chee Lap.; Guo, Jun.; White, Timothy John.; Tse, Man Siu.; Tan, Ooi Kiang.
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Copyright year:
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2011 |
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Abstract:
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Uniform SnO 2 nanorod arrays have been deposited at low temperature by plasma-enhanced chemical vapor deposition (PECVD). ZnO surface modifi cation is used to improve the selectivity of the SnO 2 nanorod sensor to H 2 gas. The ZnO-modifi ed SnO 2 nanorod sensor shows a normal n-type response to 100 ppm CO, NH 3 , and CH 4 reducing gas whereas it exhibits concentrationdependent n–p–n transitions for its sensing response to H 2 gas. This abnormal sensing behavior can be explained by the formation of n-ZnO/p-Zn-O-Sn/n-SnO 2 heterojunction structures. The gas sensors can be used in highly selective H 2 sensing and this study also opens up a general approach for tailoring the selectivity of gas sensors by surface modification. |
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Subject:
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DRNTU::Engineering::Electrical and electronic engineering::Nanoelectronics. |
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Type:
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Journal Article |
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Series/ Journal Title:
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Advanced functional materials |
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School:
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School of Electrical and Electronic Engineering |
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Rights:
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© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
