A highly selective ZnO: based thick-film hydrogen sensor has been developed. The surface morphological studies indicate that the average grain size increases with higher amounts of in ZnO. It is observed that the sensitivity increases with the grain size. A possible working model for the sensor is postulated. was mixed in ZnO in various weight percentages. These mixtures were screen printed on alumina substrate. The sensors operate at an operating temperature of C and their conductance increases linearly with the square root of the concentration of gas in ambient air. The response time of these sensors is around 20 s.
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Dayan et al. (1998) studied this question.
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