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DOPED AND UNDOPED ZINC OXIDE AS HUMIDITY SENSOR

Journal: International Journal of Engineering Sciences & Research Technology (IJESRT) (Vol.7, No. 1)

Publication Date:

Authors : ; ;

Page : 179-185

Keywords : Humidity; Pellets; Doped; Sensing Elements; Sensitivity.;

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Abstract

Present paper deals with a comparative performance of pure ZnO and Fe2O3-doped ZnO nanomaterials as humidity sensor. Fe2O3 doping was done for improvement of sensitivity. Characterizations of materials were done using SEM and XRD. SEM images show the surface morphology and X-ray diffraction reveals the crystallite size of sensing materials. The pellets were annealed at 500°C for 3 hours and thereafter humidity sensing studies were carried out. It was observed that as relative humidity (%RH) increases, there was decrease in the resistance of pellet for the entire range of %RH (relative humidity). Results were found reproducible for all the sensing elements. Maximum sensitivity was found to be 22.18 MΩ /%RH for Fe2O3-doped ZnO sensing elements.

Last modified: 2018-01-11 15:29:14