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Abstract
Gold oxide films obtained on the surface of polycrystalline gold foil upon oxidation by oxygen acti- vated by a high-frequency discharge have been studied by X-ray photoelectron spectroscopy. High-frequency O 2 activation affords oxide films more than 3-5 nm thick. As follows from Au4 f spectra, the surface gold atoms are oxidized to the oxidation state +3. The O1 s spectra have a composite shape and are decomposed into four components that characterize nonequivalent states of oxygen in the resulting oxide films. It is assumed that the two major oxygen states ( E b (O1 s ) = 529.0 and 530.0 eV) correspond to the oxygen atoms in two- and three- dimensional gold oxide Au 2 O 3 , respectively. The oxygen states characterized by the higher binding energies ( E b (O1 s ) = 531.8 and 535.2 eV) likely correspond to molecular oxygen in peroxide and superoxide groups, respectively. DOI: 10.3103/S0027131407060090
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