ZnO thick film gas sensors fabrication and its structural and electrical Properties
Keywords:
Thick film sensor, ZnO, metal oxide thick film, gas sensorAbstract
In the present work, the ZnO thick films were prepared by a standard screen printing method on alumina substrate. The developed thick films were fired at different temperatures in air atmosphere. The structural and electrical properties were investigated. X-Ray diffraction pattern analysis shows that fabricated films are polycrystalline. Scanning electron microscopy SEM shows that the fabricated ZnO films are granular and porous. The DC resistance of the films was measured by half bridge method in air atmosphere at different temperatures. The films were showing decrease in resistance with increase in temperature indicating semiconductor behavior. The resistivity, activation energy and temperature coefficient of resistance (TCR) are evaluated at different firing temperatures.
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