Toward Control of Gold Cluster Aggregation on TiO2 via Surface Treatments

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 studie...

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Bibliographic Details
Published in:	Journal of physical chemistry. C 2015-10, Vol.119 (43), p.24465-24474
Main Authors:	Ruzicka, Jan-Yves, Abu Bakar, Faridah, Hoeck, Christoffer, Adnan, Rohul, McNicoll, Campbell, Kemmitt, Tim, Cowie, Bruce C, Metha, Gregory F, Andersson, Gunther G, Golovko, Vladimir B
Format:	Article
Language:	eng
Online Access:	Get full text
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Summary:	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.
ISSN:	1932-7447 1932-7455