Effect of humidity on the gas sensing property of the tetrapod-shaped ZnO nanopowder sensor

被引：98
作者：
Bai, Zikui [2 ]
Xie, Changsheng [1 ,2 ]
Hu, Mulin [1 ]
Zhang, Shunping [2 ]
Zeng, Dawen [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Nanomat & Smart Sensor Res Lab, Dept Mat Sci & Engn, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2008年 / 149卷 / 01期
关键词：
humidity; sensitivity; stability; tetrapod-shaped ZnO nanopowders;
D O I：
10.1016/j.mseb.2007.11.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The testing chamber humidity and the storage circumstance humidity effects on the tetrapod-shaped ZnO nanopowder (named as T-ZnO) thick film sensors were investigated by measuring the resistance and sensitivity. The resistance increases gradually with increasing relative humidity (RH) in a range of 32%-75% RH in testing chamber, while in a range of 75%-96% RH, decreases gradually with the increase of RH. The sensitivity to ethanol 100 ppm in testing chambers with different humidity is in the order of 50% RH > of 75% RH > of 32% RH > of 96% RH. The sensitivity change in the storage circumstance with different RH is similar to the change in testing chamber with different RH. The stability of T-ZnO sensor is influenced evidently by the storage circumstance humidity. The water vapour in the tetrapod-shaped ZnO nanopowders was investigated by thermogravimetric analysis (TGA). The testing gas and the reactant adsorbed in the sensitive film were characterized by infrared spectrum (IR). The explanation of the observed effects was given and the mechanism of interaction of the ZnO sensing layer with H2O was proposed. (C) 2007 Elsevier B.V. All rights reserved.
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页码：12 / 17
页数：6
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