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A. I. Stadnichenko, S. V. Koshcheyev, A. I. Boronin

Oxidation of the Polycrystalline Gold Foil Surfaces and X-Ray Photoelectronic Spectroscopy Study of Oxygen States in Oxide Layers


In this work the gold oxide layers, produced on the surface of polycrystalline gold foil,were studied by means of X-ray photoelectron spectroscopy (XPS). Using method of O2 high frequency activation the effective formation of 3-5 nm oxide films were formed. From the analysis of Au4f spectra the main state of gold on the surface was found to be in the oxidation power 3+. Curve fitting analysis of O1s line showed the existence of 4 individual components characterizing different nonequivalent oxygen states in the oxide layers. It is proposed that two main oxygen species (Eb(O1s) = 529.0 eV and 530.0 eV) can be related to oxygen atoms in two- and three - dimensional gold oxide phase. Two other oxygen species characterized by elevated values of binding energy (Eb(O1s) = 531.8 eV and 535.2 eV) are attributed to oxygen consisting of the peroxide and superoxide groups, respectively.
Moscow University Chemistry Bulletin.
2007, Vol. 48, No. 6, P. 418

Copyright (C) Chemistry Dept., Moscow State University, 2002
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