標題: Surface defect engineering: gigantic enhancement in the optical and gas detection ability of metal oxide sensor
作者: Wang, Wen-Chieh
Lai, Chun-Yen
Lin, Yu-Ting
Yua, Tzu-Hsuan
Chen, Zong-Yi
Wu, Wen-Wei
Yeh, Ping-Hung
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-Jan-2016
摘要: In this work, the detection ability of nanosensors can be improved extraordinarily via surface defect engineering. A kinked SnO2-X/SnO2 nanostructure was fabricated by tuning the oxygen flow, and this kinked SnO2-X/SnO2 nanostructure was used to study the mechanism of surface defect (oxygen vacancy, V-O) effects via electric measurements. For UV light sensing, the response of the SnO2-X NW device is always better than the SnO2 NW device, and is two orders higher under pure O-2 surrounding conditions. The detection mechanism can be clarified by changing the detection environment (oxygen concentration) and the UV light detection sensitivity can be improved by increasing the surface V-O density. Furthermore, the SnO2-X NW device is very sensitive to its surrounding environment due to the high surface V-O density. Hence, CO/O-2 alternate-detection was used to verify our hypothesis; the results show that the SnO2-X NW device presents great detection abilities, compared with the SnO2 NW device. The sensitivity of the SnO2-X NW device is two orders higher and the reset/response time is faster, compared with the SnO2 NW device. To verify this hypothesis, the polycrystalline structure was fabricated to prove that the detection ability of metal oxide nanosensors can be improved gigantically by increasing surface defect amounts.
URI: http://dx.doi.org/10.1039/c6ra09033h
http://hdl.handle.net/11536/133982
ISSN: 2046-2069
DOI: 10.1039/c6ra09033h
期刊: RSC ADVANCES
Volume: 6
Issue: 69
起始頁: 65146
結束頁: 65151
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