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<strong>Electrical impedance analysis of ZnO thin films for ammonia gas sensors</strong>

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Authentication Code dc
 
Title Statement <strong>Electrical impedance analysis of ZnO thin films for ammonia gas sensors</strong>
 
Added Entry - Uncontrolled Name R, Mariappan ; Adhiyamaan College of Engineeering
S, Dinagaran ; University College of EngineeringThirukkuvalai
P, Srinivasan ; University College of EngineeringPanruti
S, Vijayakumar ; Government College of Engineering
 
Uncontrolled Index Term ZnO device; Impedance analysis; Ammonia sensor
 
Summary, etc. <span>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.</span>
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2023-07-12 15:11:10
 
Electronic Location and Access application/pdf
http://op.niscair.res.in/index.php/IJCT/article/view/71226
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 30, ##issue.no## 4 (2023): Indian Journal of Chemical Technology
 
Language Note en