Callaghan Innovation Research Papers

Back to Research Papers

TitleToward Control of Gold Cluster Aggregation on TiO2 via Surface Treatments
Publication TypeJournal Article
Year of Publication2015
AuthorsRuzicka, J.-Y., F. Bakar Abu, Hoeck C., Adnan R., McNicoll C., Kemmitt T., Cowie B.C., Metha G.F., Andersson G.G., and Golovko V.B.
JournalJournal of Physical Chemistry C
Pagination24465 - 24474
Date Published2015
ISSN19327447 (ISSN)
KeywordsAfter high temperature, Cluster aggregation, Deposition, Exposed to, Gold clusters, Gold compounds, Ligand shells, Ozone, Post treatment, titanium dioxide, Triphenyl phosphines, UV-Vis diffuse reflectance spectroscopy, X ray photoelectron spectroscopy
AbstractWell-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. © 2015 American Chemical Society.

Back to top