Direct imaging of pt single atoms adsorbed on TiO2 (110) Surfaces

Teng Yuan Chang, Yusuke Tanaka, Ryo Ishikawa, Kazuaki Toyoura, Katsuyuki Matsunaga, Yuichi Ikuhara, Naoya Shibata

    Research output: Contribution to journalArticlepeer-review

    78 Citations (Scopus)

    Abstract

    Noble metal nanoparticles (e.g., gold and platinum) supported on TiO 2 surfaces are utilized in many technological applications such as heterogeneous catalysts. To fully understand their enhanced catalytic activity, it is essential to unravel the interfacial interaction between the metal atoms and TiO2 surfaces at the level of atomic dimensions. However, it has been extremely difficult to directly characterize the atomic-scale structures that result when individual metal atoms are adsorbed on the TiO2 surfaces. Here, we show direct atomic-resolution images of individual Pt atoms adsorbed on TiO2 (110) surfaces using aberration-corrected scanning transmission electron microscopy. Subangstrom spatial resolution enables us to identify five different Pt atom adsorption sites on the TiO2 (110) surface. Combining this with systematic density functional theory calculations reveals that the most favorable Pt adsorption sites are on vacancy sites of basal oxygen atoms that are located in subsurface positions relative to the top surface bridging oxygen atoms.

    Original languageEnglish
    Pages (from-to)134-138
    Number of pages5
    JournalNano Letters
    Volume14
    Issue number1
    DOIs
    Publication statusPublished - 2014 Jan 8

    Keywords

    • Heterogeneous catalyst
    • metal-oxide interaction
    • platinum
    • scanning transmission electron microscopy
    • single atom imaging
    • titanium oxide

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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