H2S detection sensing characteristic of CuO/SnO2 sensor

被引:82
作者
Liu, JH [1 ]
Huang, XJ
Ye, G
Liu, W
Jiao, Z
Chao, WL
Zhou, ZB
Yu, ZL
机构
[1] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
[2] Chinese Acad Sci, Hefei Inst Intelligent Machines, Hefei 230031, Peoples R China
[3] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
来源
SENSORS | 2003年 / 3卷 / 05期
关键词
tin oxide; copper oxide; sensing properties; H2S;
D O I
10.3390/s30500110
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Among the various metal oxide additives tested, the complex of CuO is outstanding in promoting the sensing properties of an SnO2 sensor for H2S in air. The SnO2 sensors loaded with 5 wt.% CuO is extremely sensitive to H2S at 200degreesC and below, while it is almost insensitive to many other gases. The response to H2S is rather slow but the recovery is very rapid. The added CuO particles interact electronically with the surface of SnO2 (p-n junctions) to make the sensor highly resistive, while the interaction is disconnected when CuO is sulfurized to CuS in the H2S containing atmosphere, leading to a drastic decrease in electrical resistance. The H2S sensing properties, particularly the rate of response, of CuO/SnO2 sensors are influenced by the CuO loadings and operating temperature as well as the thickness of CuO loading film.
引用
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页码:110 / 118
页数:9
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