title: Preparation and structure of a single Au atom on the TiO2(110) surface: control of the Au-metal oxide surface interaction.
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.
authors.affiliation: Catalysis Research Center, Hokkaido University Kita 21-10, Kita Sapporo 001-0021, Japan. askr@cat.hokudai.ac.jp
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Asakura
authors.forename: Satoru
authors.initials: S
authors.lastname: Takakusagi
authors.forename: Hiroko
authors.initials: H
authors.lastname: Ariga
authors.forename: Wang-Jae
authors.initials: WJ
authors.lastname: Chun
authors.forename: Shushi
authors.initials: S
authors.lastname: Suzuki
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Koike
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Uehara
authors.forename: Kotaro
authors.initials: K
authors.lastname: Miyazaki
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Iwasawa