SnO 2 /Fe 2 O 3 nanocomposites have been prepared over the entire composition range (0–100 mol% Fe 2 O 3 ) through precipitation from solution, and their ethanol-sensing performance (10–200 ppm C 2 H 5 OH) was evaluated using electrical conductivity measurements in the temperature range 150–450°C. The sensing performance of the nanocomposites is shown to strongly depend on their composition. The Fe 2 O 3 -rich (>70 mol% Fe 2 O 3 ) nanocomposites offer a large C 2 H 5 OH response and low sensitivity to ambient humidity. The oxidizing and acid properties of the nanocomposites have been studied using temperature-programmed hydrogen reduction and ammonia desorption measurements, and their catalytic activity for oxidation of ethanol was assessed by gas chromatography mass spectrometry in a flow system. The results indicate that increasing the Fe 2 O 3 content of the nanocomposites reduces the density of acid centers on their surface and enhances their activity for oxidation of ethanol.
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Kovalenko et al. (2006) studied this question.
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