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