title: Adsorption sites of single noble metal atoms on the rutile TiO2 (1 1 0) surface influenced by different surface oxygen vacancies.
abstract: Atomic adsorption of Au and Pt on the rutile (1 1 0) surface was investigated by atomic-resolution aberration-corrected scanning transmission electron microscopy (STEM) measurements combined with density functional theory calculations. Au single atoms were deposited on the surface in a vacuum condition, and the observed results were compared with Pt single atoms on the same surface prepared by the same experimental manner. It was found that Au single atoms are stably adsorbed only at the bridging oxygen vacancy sites, which is quite different from Pt single atoms exhibiting the most frequently observed adsorption at the basal oxygen vacancy sites. Such a difference in oxygen-vacancy effect between Au and Pt can be explained by electronic structures of the surface vacancies as well as characters of outermost atomic orbitals of Au and Pt.
authors.affiliation: Department of Materials Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. Nanostructures Research Laboratory, Japan Fine Ceramic Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan.
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Matsunaga
authors.forename: Teng-Yuan
authors.initials: TY
authors.lastname: Chang
authors.forename: Ryo
authors.initials: R
authors.lastname: Ishikawa
authors.forename: Qian
authors.initials: Q
authors.lastname: Dong
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Toyoura
authors.forename: Atsutomo
authors.initials: A
authors.lastname: Nakamura
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ikuhara
authors.forename: Naoya
authors.initials: N
authors.lastname: Shibata