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

Author

Listed:
  • J.-L. LU

    (Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, China;
    Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany)

  • 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)

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.

Suggested Citation

  • J.-L. Lu & J. Weissenrieder & S. Kaya & H.-J. Gao & S. Shaikhutdinov & H.-J. Freund, 2007. "STRUCTURE, THERMAL STABILITY, AND CO ADSORPTION PROPERTIES OF PD NANOPARTICLES SUPPORTED ON AN ULTRA-THINSiO2FILM," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 14(05), pages 927-934.
    • Handle: RePEc:wsi:srlxxx:v:14:y:2007:i:05:n:s0218625x07010469
    DOI: 10.1142/S0218625X07010469
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