Abstract
Nanostructured ZnO powder was synthesised by a simple chemical route. The material was characterised by XRD, UV, SEM and TEM techniques. XRD and TEM studies confirm that a nanostructured ZnO is obtained by using simple chemical route. The nanopowder was fired at an optimised temperature of 200°C for 1/2 h. The prepared powder had crystallite size in the range from 19 to 41 nm. Thick films of synthesised ZnO powder were prepared by screen printing technique. The gas sensing performances of these films for various gases were tested. Films showed highest response to H2S (100 ppm) gas at 300°C temperature with poor responses to others. The quick response and fast recovery are the main features of this sensor. The effects of microstructure, operating temperature and gas concentration on the gas response, selectivity, response time and recovery time of the sensor in the presence of H2S gas and others were studied and discussed.
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