Electrical impedance analysis of ZnO thin films for ammonia gas sensors

Indian Journal of Chemical Technology

article

R. Mariappan¹  S. Dinagaran²  P. Srinivasan³  S. Vijayakumar⁴ 

[1]Department of Physics, Adhiyamaan College of Engineering

[2]University College of Engineering Thirukkuvalai

[3]Department of Physics, National Institute of Technology Silchar

[4]Government Arts College for Women

关键词: ZnO device;    Impedance analysis;    Ammonia sensor;    Article;   

DOI  :  10.56042/ijct.v30i4.71226

学科分类：化学（综合）

来源: National Institute of Science Communication and Information Resources

【 摘 要 】

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.

【 授权许可】

CC BY-NC-ND