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Electrical Impedance Analysis of ZnO Thin Films for Ammonia Gas Sensors


Affiliations
1 Department of Physics, Adhiyamaan College of Engineering, Hosur - 635 109, Krishnagiri, Tamil Nadu, India
2 University College of Engineering Thirukkuvalai, Thirukkuvalai - 610 204, Tamil Nadu, India
3 Department of Physics, National Institute of Technology Silchar, Silchar, Assam, 788 010, India
4 Government Arts College for Women, Karimangalam - 635 111, Dharmapuri, Tamil Nadu, India
 

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°C. 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°C. 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.

Keywords

ZnO Device, Impedance Analysis, Ammonia Sensor.
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Abstract Views: 86

PDF Views: 67




  • Electrical Impedance Analysis of ZnO Thin Films for Ammonia Gas Sensors

Abstract Views: 86  |  PDF Views: 67

Authors

R. Mariappan
Department of Physics, Adhiyamaan College of Engineering, Hosur - 635 109, Krishnagiri, Tamil Nadu, India
S. Dinagaran
University College of Engineering Thirukkuvalai, Thirukkuvalai - 610 204, Tamil Nadu, India
P. Srinivasan
Department of Physics, National Institute of Technology Silchar, Silchar, Assam, 788 010, India
S. Vijayakumar
Government Arts College for Women, Karimangalam - 635 111, Dharmapuri, Tamil Nadu, India

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°C. 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°C. 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.

Keywords


ZnO Device, Impedance Analysis, Ammonia Sensor.

References