论文信息 - Study of Surface Acid-Base Properties Of Gas-Sensitive Metal Oxides

Study of Surface Acid-Base Properties Of Gas-Sensitive Metal Oxides

Binary (ZnO, Fe2O3) and ternary (ZnFe2O4) gas-sensitive oxide materials are synthesized, and the correlation between their sensitivity to ethanol vapors and the functional chemical composition of the surface is studied by X-ray photoelectron spectroscopy and adsorption of acid–base indicators. It is found that the sensitivity to ethanol vapors increases with increasing acid sites with pKa = 2.5 and with increasing percentage of surface oxygen of OH/CO3/C–O groups. This correlation is caused by the specific interaction between ethanol molecules and hydroxyl groups on the surface of the oxides.

V. M. Kondrat'ev | S. Nalimova

[1] Ghenadii Korotcenkov,et al. Metal oxide composites in conductometric gas sensors: Achievements and challenges , 2017 .

[2] V. Moshnikov,et al. Controlling surface functional composition and improving the gas-sensing properties of metal oxide sensors by electron beam processing , 2016, Glass Physics and Chemistry.

[3] N. E. Kazantseva,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 , 2013 .

[4] V. Moshnikov,et al. Surface functional composition and sensor properties of ZnO, Fe2O3, and ZnFe2O4 , 2013 .

[5] I. E. Gracheva,et al. Hierarchical nanostructured semiconductor porous materials for gas sensors , 2010 .

[6] Guido Faglia,et al. Gas-sensitive properties of thin film heterojunction structures based on Fe2O3–In2O3 nanocomposites , 2003 .

[7] M. Ivanovskaya,et al. The features of thin film and ceramic sensors at the detection of CO and NO2 , 2000 .

[8] S. Ikeda,et al. X-Ray Photoelectron Spectroscopic Study for the Reaction of Evaporated Iron with O2 and H2O , 1973 .

[9] V. Moshnikov,et al. Investigation of the vapor-sensitive properties of zinc oxide layers by impedance spectroscopy , 2017 .

[10] P. Marcus,et al. X‐ray photoelectron spectroscopy analysis of copper and zinc oxides and sulphides , 1992 .

[11] G. C. Allen,et al. X-Ray photoelectron spectroscopy of iron–oxygen systems , 1974 .