Au-Ni and Au-Fe heterometallic systems: an X-ray photoelectron spectroscopy study

作者：Naumkin A V^*; Vasil'kov A Yu

来源：Russian Chemical Bulletin, 2013, 62(12): 2559-2566.

DOI：10.1007/s11172-013-0373-x

• X-ray photoelectron spectroscopy
• differential charging
• metal-vapor synthesis
• bimetallic nanoparticle
• catalytic activity

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.

• 出版日期2013-12