Investigation of the electronic interaction between TiO2(1 1 0) surfaces and Au clusters by PES and STM

Taketoshi Minato, Tomofumi Susaki, Susumu Shiraki, Hiroyuki S. Kato, Maki Kawai, Ken Ichi Aika

    Research output: Contribution to journalConference articlepeer-review

    99 Citations (Scopus)

    Abstract

    The electronic interaction between TiO2(110) surfaces and Au clusters has been investigated by photoelectron spectroscopy (PES) and scanning tunneling microscopy (STM) to elucidate the high catalytic activity of Au/TiO2. With increasing Au amount, the shift of O 2p nonbonding peak towards the Fermi level and the decrease in the Ti 3d peak area were precisely observed in the valence band PES spectra of Au/TiO2(110). These changes in the valence band structure are attributed to the electron transfer from the surface defects on TiO2(110) into the Au clusters. At the low coverage region, the STM images consistently show that the Au clusters nucleate at the surface defects of TiO2(110). Here, we discuss the electronic interaction between the Au clusters and the TiO2 surface relating to the catalytic activity of Au clusters on surfaces.

    Original languageEnglish
    Pages (from-to)1012-1017
    Number of pages6
    JournalSurface Science
    Volume566-568
    Issue number1-3 PART 2
    DOIs
    Publication statusPublished - 2004 Sep 20
    EventProceedings of the 22nd European Conference on Surface Science - Prague, Czech Republic
    Duration: 2003 Sep 72003 Sep 12

    Keywords

    • Catalysis
    • Gold
    • Photoelectron spectroscopy
    • Scanning tunneling microscopy
    • Surface defects
    • Titanium oxide

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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