STRUCTURE, THERMAL STABILITY, AND CO ADSORPTION PROPERTIES OF PD NANOPARTICLES SUPPORTED ON AN ULTRA-THINSiO2FILM

J.-L. Lu, J. Weissenrieder, S. Kaya, H.-J. Gao, S. Shaikhutdinov () and H.-J. Freund
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J.-L. Lu: Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, China;
J. Weissenrieder: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
S. Kaya: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
H.-J. Gao: Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, China
S. Shaikhutdinov: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
H.-J. Freund: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Surface Review and Letters (SRL), 2007, vol. 14, issue 05, 927-934

Abstract: Nucleation, growth, and thermal stability ofPdparticles vapor-deposited on an ultra-thin crystalline silica film grown onMo(112)have been studied by scanning tunneling microscopy, X-ray photoelectron spectroscopy, infrared reflection absorption spectroscopy, and temperature-programmed desorption ofCO. No preferential nucleation ofPdon the silica film is found at room temperature deposition: the hemisphericalPdnanoparticles are homogenously dispersed on the support at all coverages studied (0.01 - 1 ML (mono layer)). ThePdparticles are resistant toward sintering up to 700 K as judged by STM; however,COadsorption studies have revealed surface chemical modification at temperatures as low as 550 K. Strong morphological changes are observed above 800 K (ultimately resulting in elongated rectangular islands at ~1000 K), which is accompanied by strong alterations ofCOadsorption properties. The results are rationalized in terms ofPdandMosubstrate interdiffusion at elevated temperatures, while the silica film basically preserves its structure.

Keywords: Model catalysts; palladium; silica; COadsorption; thin oxide films; thermal stability (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07010469

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