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Electrical impedance analysis of ZnO thin films for ammonia gas sensors

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Title Electrical impedance analysis of ZnO thin films for ammonia gas sensors
 
Creator Mariappan, R.
Dinagaran, S.
Srinivasan, P.
Vijayakumar, S.
 
Subject ZnO device
Impedance analysis
Ammonia sensor
 
Description 483-491
The electrical impedance analysis of the ZnO films has been performed using complex impedance spectroscopy in the
frequency range from 100 Hz to 1 MHz with temperature change from 70 to 175℃. Combined impedance and modulus
plots have been used to analyse the sample behaviour as a function of frequency at different temperatures. Temperature
dependence of ac conductivity indicates that the electrical conduction in the material is a thermally activated process. The
frequency dependence of the ac conduction activation energy is found to obey a mathematical formula. It is concluded that
the conductivity mechanism in the ZnO sensor is controlled by surface reaction. The operating temperature of the ZnO gas
sensor is 175℃. The impedance spectrum also exhibited a decreased semicircle radius as the ammonia concentration is
increased from 50 to 500 ppm. In addition, the impedance spectrum also exhibited a decreased semicircle radius with the
exposure time increase from 0 to 20 min thereafter slightly increased. Impedance spectroscopy analysis has shown that the
resistance variation due to grain boundaries significantly contributed to the gas sensor characteristics.
 
Date 2023-07-11T05:33:54Z
2023-07-11T05:33:54Z
2023-07
 
Type Article
 
Identifier 0975-0991 (Online); 0971-457X (Print)
http://nopr.niscpr.res.in/handle/123456789/62284
https://doi.org/10.56042/ijct.v30i4.71226
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJCT Vol.30(4) [July 2023]