Complex Impedance Analysis for Sensitivity and Selectivity of SnO2 Gas Sensors

Journal of Inorganic Materials

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Complex Impedance Analysis for Sensitivity and Selectivity of SnO₂ Gas Sensors

FU Gang^1,2; CHEN Zhi-Xiong¹; ZHANG Jin-Xiu ²

1.Department of Physics; Guangzhou Normal University; Guangzhou 510400; China; 2.Department ofPhysics; Zhongshan University; Guangzhou 510275; China

Received:1999-09-16 Revised:1999-11-05 Published:2000-06-20 Online:2000-06-20

Abstract

Abstract: The impedance characteristics of thick films 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.

Key words: SnO₂ thick film, alcohol sensor, complex impedance, sensitivity, selectivity

CLC Number:

TN304

FU Gang,CHEN Zhi-Xiong,ZHANG Jin-Xiu. Complex Impedance Analysis for Sensitivity and Selectivity of SnO₂ Gas Sensors[J]. Journal of Inorganic Materials.

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Complex Impedance Analysis for Sensitivity and Selectivity of SnO₂ Gas Sensors

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