Toward Control of Gold Cluster Aggregation on TiO2 via Surface Treatments

Jan-Yves Ruzicka, Faridah Bakar, Christoffer Hoeck, Rohul Adnan, Campbell McNicoll, Tim Kemmitt, Bruce Cowie, Gregory Metha, Gunther Andersson, Vladimir Golovko

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Well-defined Au-TiO2 materials were synthesized by deposition of triphenylphosphine-protected Au9 clusters on TiO2 (Aeroxide P-25), pre-treated in eight different ways and subsequently exposed to two post-treatments. X-ray photoelectron spectroscopy and UV-vis diffuse reflectance spectroscopy studies showed that in most cases the PPh3 ligand shell was removed upon deposition even before post-treatment, coinciding with some cluster aggregation. However, clusters deposited on TiO2 treated using H2SO4 and H2O2 showed remarkable resistance to aggregation, even after high-temperature calcination, while clusters on H2-treated TiO2 showed the greatest resistance to aggregation under ozonolysis.

    Original languageEnglish
    Pages (from-to)24465-24474
    Number of pages10
    JournalJournal of Physical Chemistry C
    Volume119
    Issue number43
    DOIs
    Publication statusPublished - 2015

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