Abstract
The effect of calcining temperature on gas sensitivity and resistance in wet air was observed with elements of SnO2 thick film. The results were interpreted as a function of the crystallite size. As the crystallite size reduced, the sensitivity to H2 gas enhanced at temperatures lower than 300‡C, but at those higher than 350‡C it did not. The temperatures showing the minimum resistance in air and the maximum sensitivity to H2 gas decreased with reduction of the crystallite size. The temperature variations were assigned to the change of the activation energies of the oxygen adsorbates. It is suggested that the decrease of activation energies is one of the reasons for the sensitivity enhancement with the fine powder.
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