Electrical impedance analysis of ZnO thin films for ammonia gas sensors

IF 0.5 4区工程技术 Q4 CHEMISTRY, APPLIED Indian Journal of Chemical Technology Pub Date : 2023-01-01 DOI:10.56042/ijct.v30i4.71226

R.Mariappan, S. Dinagaran, P. Srinivasan, S. Vijayakumar

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Abstract

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.

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氨气传感器用ZnO薄膜的电阻抗分析

采用复阻抗谱法对ZnO薄膜进行了电阻抗分析，频率范围为100 Hz ~ 1 MHz，温度范围为70 ~ 175℃。结合阻抗和模量图已被用来分析样品的行为作为频率在不同温度下的函数。交流电导率的温度依赖性表明材料中的导电是一个热激活过程。发现交流传导活化能的频率依赖性服从一个数学公式。结果表明，ZnO传感器的导电机理是由表面反应控制的。ZnO气体传感器的工作温度为175℃。当氨浓度从50 ppm增加到500 ppm时，阻抗谱的半圆半径也减小。此外，阻抗谱的半圆半径也随暴露时间的增加而减小，暴露时间从0增加到20 min，之后略有增加。阻抗谱分析表明，晶界引起的电阻变化对气体传感器的特性有重要影响。

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来源期刊

Indian Journal of Chemical Technology 工程技术-工程：化工

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Indian Journal of Chemical Technology has established itself as the leading journal in the exciting field of chemical engineering and technology. It is intended for rapid communication of knowledge and experience to engineers and scientists working in the area of research development or practical application of chemical technology. This bimonthly journal includes novel and original research findings as well as reviews in the areas related to – Chemical Engineering, Catalysis, Leather Processing, Polymerization, Membrane Separation, Pharmaceuticals and Drugs, Agrochemicals, Reaction Engineering, Biochemical Engineering, Petroleum Technology, Corrosion & Metallurgy and Applied Chemistry.