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Volume 162, 2013
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Preparation and structure of a single Au atom on the TiO2(110) surface: control of the Au–metal oxide surface interaction

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Abstract

Three-dimensional Au structures on bare and organic-compound-modified TiO2(110) surfaces were interrogated by Au L3-edge polarization dependent total reflection fluorescence X-ray absorption fine structure (PTRF-XAFS) spectroscopy. On the bare TiO2(110) surface, icosahedral Au55 nanoclusters were the main product found. When the surfaces were modified with ortho or meso mercaptobenzoic acid (o-MBA or m-MBA), Au was atomically dispersed. Sulfur atoms in the o- and m- MBA formed strong covalent bonds with Au to produce stable Au-MBA (o- and m- forms) surface complexes. On the other hand, only oxygen atoms on the surface did not make a strong enough interaction to stabilize the Au species. We discuss how the Au species formed on the modified TiO2(110) surface and the possibility to control the Au structure by the surface modification method.

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Article information


Submitted
23 Nov 2012
Accepted
12 Dec 2012
First published
18 Dec 2012

Faraday Discuss., 2013,162, 165-177
Article type
Paper

Preparation and structure of a single Au atom on the TiO2(110) surface: control of the Au–metal oxide surface interaction

K. Asakura, S. Takakusagi, H. Ariga, W. Chun, S. Suzuki, Y. Koike, H. Uehara, K. Miyazaki and Y. Iwasawa, Faraday Discuss., 2013, 162, 165
DOI: 10.1039/C2FD20131C

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