Abstract
The new version of sol-gel derived SnO2 thin-film hydrogen sensor operating at about two times lower temperature and, respectively, with lower consumed power have been obtained. Besides, relatively low resistance of the sensors resulting due to determination of the Pt catalyst layer optimal thickness allows reliable operation at low bias voltage which promotes stable operation even at high relative humidity conditions. In the present work we have examined changes of the sol-gel derived thin-film hydrogen sensors characteristics with increasing the Pt catalyst layer thickness up to 30 nm. It is shown that many parameters of gas sensors such as consumed power, long-term stability as well as selectivity are improved.
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