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

作者：Karpova S S^*; Moshnikov V A; Maksimov A I; Mjakin S V; Kazantseva N E

来源：Semiconductors, 2013, 47(8): 1026-1030.

DOI：10.1134/S1063782613080095

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 Bronsted acid sites with the acidity index pK (a) a parts per thousand 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.

• 出版日期2013-8