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Issue 8, 2011
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Model Ag/HOPG catalysts: preparation and STM/XPS study

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Model catalysts—Ag on highly oriented pyrolytic graphite (Ag/HOPG)—have been studied using scanning tunneling microscopy (STM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray induced Auger electron spectroscopy (XAES). Two types of catalysts were compared: Ag nanoparticles supported on sputtered and non-sputtered HOPG, and the influence of graphite surface defects on the stabilization of Ag nano-sized particles was discussed. A procedure for the preparation of stable (up to 250 °C under a submillibar oxygen/ethylene pressure) silver nanoparticles is suggested. The disappearance of Ag particles in STM images after a sample treatment in the ambient conditions is explained in terms of silver penetration into graphite and the loss of conductivity due to adsorption of contaminants.

Graphical abstract: Model Ag/HOPG catalysts: preparation and STM/XPS study

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Publication details

The article was received on 12 Apr 2011, accepted on 22 Jul 2011 and first published on 22 Aug 2011

Article type: Paper
DOI: 10.1039/C1CY00127B
Catal. Sci. Technol., 2011,1, 1432-1439

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    Model Ag/HOPG catalysts: preparation and STM/XPS study

    D. V. Demidov, I. P. Prosvirin, A. M. Sorokin and V. I. Bukhtiyarov, Catal. Sci. Technol., 2011, 1, 1432
    DOI: 10.1039/C1CY00127B

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