Complex impedance analysis for sensitivity and selectivity of SnO2 gas sensors

被引：0
|
作者：
Fu, Gang [1 ]
Chen, Zhixiong [1 ]
Zhang, Jinxiu [1 ]
机构：
[1] Guangzhou Normal Univ, Guangzhou, China
来源：
Wuji Cailiao Xuebao/Journal of Inorganic Materials | 2000年 / 15卷 / 03期
关键词：
Alcohols - Electric impedance - Electric reactance measurement - Gasoline - Oxides - Sensitivity analysis - Sensors - Thick film devices;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The impedance characteristics of thick film gas sensors were investigated by measuring the dependence of the reactance component on frequency in testing gas. Using the variations of reactance with the concentration of gasoline or alcohol gas to define the sensitivity of gas sensors, a new method greatly improving the sensitivity and selectivity of gas sensors compared with the traditional d.c. method was proposed. Such improvements maybe come from that the complex impedance analysis detects not only the change of grain boundary resistance but also the change of grain boundary capacitance with the gas adsorption and/or desorption on the surfaces of sensors.
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页码：456 / 460
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