Abstract
The influence of chemical composition and structural peculiarities of Fe2O3-SnO2 and Fe2O3-In2O3 nano-scale composites on their gas-sensitive properties has been studied. The correlation between the structural factors and the functional characteristics of the sensitive layers (long-term parameter stability, threshold sensitivity, selectivity) when detecting some explosive and toxic gases (CH4, CO, C2H5OH, NO2, O3) has been established. The active layers in form of thin and thick films were prepared by liquid phase deposition of hydroxide sols stabilised with various additives (Sol-Gel Technology). It was shown that the indicated preparative approach allows achieving the required gas-sensitive features of the metaloxide semiconductor sensors by fine adjusting of an active layer structure. Advanced materials demonstrating optimal sensitive characteristics regarding the studied gases have been proposed.Key wordsExplosive gasestoxic gasesgas sensorselectivityFe2O3 In2O3 SnO2
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