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Study of the effect of the acid-base surface properties of ZnO, Fe2O3 and ZnFe2O4 oxides on their gas sensitivity to ethanol vapor

  • Surfaces, Interfaces, and Thin Films
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Abstract

Binary (ZnO, Fe2O3) and ternary (ZnFe2O4) gas-sensitive oxide materials are synthesized, and the correlation between their sensitivity to ethanol vapor and the functional chemical composition of the surface is studied by X-ray photoelectron spectroscopy and by the technique of the adsorption of acid-base indicators. It is found that the sensitivity to ethanol increases with increasing content of Brönsted acid sites with the acidity index pK a ≈ 2.5 and with increasing percentage of surface oxygen involved in OH/CO3/C-O groups. This interrelation is attributed to the specific features of interaction between ethanol molecules and hydroxyl groups on the surface of the oxides.

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Correspondence to S. S. Karpova.

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Original Russian Text © S.S. Karpova, V.A. Moshnikov, A.I. Maksimov, S.V. Mjakin, N.E. Kazantseva, 2013, published in Fizika i Tekhnika Poluprovodnikov, 2013, Vol. 47, No. 8, pp. 1022–1026.

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Karpova, S.S., Moshnikov, V.A., Maksimov, A.I. et al. Study of the effect of the acid-base surface properties of ZnO, Fe2O3 and ZnFe2O4 oxides on their gas sensitivity to ethanol vapor. Semiconductors 47, 1026–1030 (2013). https://doi.org/10.1134/S1063782613080095

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  • DOI: https://doi.org/10.1134/S1063782613080095

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