Study on sensing mechanism of CuO-SnO2 gas sensors

被引：76

作者：

Zhou, XH ^{[1
]}

Cao, QX ^{[1
]}

Huang, H ^{[1
]}

Yang, P ^{[1
]}

Hu, Y ^{[1
]}

机构：

[1] Xidian Univ, Sch Tech Phys, Xian 710071, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2003年 / 99卷 / 1-3期

关键词：

CuO-SnO2 gas sensor; sensing mechanism; p-n heterocontact;

D O I：

10.1016/S0921-5107(02)00501-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The preparations of SnO2 and CuO powders and the manufacture of CuO-SnO2 gas sensors are described in some details. The CuO content was chosen as 1.5 mol.% (sample 1), 4.4 mol.% (sample 2), 8.4 mol.% (sample 3) and 12.5 mol.% (sample 4), respectively. The resistance of all samples in air and their sensitive properties to HA alcohol vapor, C4H10 and CH2 were measured in the temperature range 20-300 degreesC, respectively. The results show that the resistance of all samples decreases exponentially with increasing temperature, when the temperature is > 31 degreesC and it increases with an increase in CuO content at a given temperature. Sample 3 exhibits the best sensitive property in the case of the same H2S-air mixture concentration and excellent selectivity. The sensitive mechanisms of these samples to different gases are discussed in details. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：44 / 47

页数：4

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