Abstract
Results of X-ray photoelectron spectroscopy (XPS) studies of Au-Ni and Au-Fe bimetallic nanoparticles (in the form of black and supported on SiO2) are considered and systematized. The nanoparticles studied were prepared by metal-vapor synthesis. XPS studies on the chemical compositions, structures, and electronic states of heterometallic nanocomposites carried out both in the traditional and differential charging mode with a bias voltage applied to the sample holder are analyzed. The effect of the composition and electronic state of the Au-Ni heterometallic system on its catalytic activity is studied. It was shown that the variable differential charging mode allows one to identify and characterize species of different nature in multi-component heterometallic nanostructured materials. A state which correlates with the catalytic activity of the Au-Ni/SiO2 system was identified in the Au 4f photoelectron spectra.
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