Abstract
SnO2/Fe2O3 nanocomposites have been prepared over the entire composition range (0–100 mol% Fe2O3) through precipitation from solution, and their ethanol-sensing performance (10–200 ppm C2H5OH) 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 Fe2O3-rich (>70 mol% Fe2O3) nanocomposites offer a large C2H5OH 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 Fe2O3 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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Original Russian Text © V.V. Kovalenko, M.N. Rumyantseva, A.M. Gaskov, E.V. Makshina, V.V. Yushchenko, I.I. Ivanova, A.Ponzoni, G. Faglia, E. Comini, 2006, published in Neorganicheskie Materialy, 2006, Vol. 42, No. 10, pp. 1195–1201.
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Kovalenko, V.V., Rumyantseva, M.N., Gaskov, A.M. et al. SnO2/Fe2O3 nanocomposites: Ethanol-sensing performance and catalytic activity for oxidation of ethanol. Inorg Mater 42, 1088–1093 (2006). https://doi.org/10.1134/S0020168506100074
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DOI: https://doi.org/10.1134/S0020168506100074