Toward Control of Gold Cluster Aggregation on TiO2 via Surface Treatments

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• 作者：Jan-Yves Ruzicka ; Faridah Abu Bakar ; Christoffer Hoeck ; Rohul Adnan ; Campbell McNicoll ; Tim Kemmitt ; Bruce C. Cowie ; Gregory F. Metha ; Gunther G. Andersson ; Vladimir B. Golovko
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：October 29, 2015
• 年：2015
• 卷：119
• 期：43
• 页码：24465-24474
• 全文大小：425K
• ISSN：1932-7455

文摘

Well-defined Au鈥揟iO₂ 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鈥搗is 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.