Journal ArticleDOI
Scanning tunneling microscopy studies of the TiO 2 ( 110 ) surface: Structure and the nucleation growth of Pd
TLDR
In this paper, the surface structure of the TiO(110) surface has been reexamined using scanning tunneling microscopy (STM), especially in terms of its temperature dependency.Abstract:
The surface structure of ${\mathrm{TiO}}_{2}(110)$ has been reexamined using scanning tunneling microscopy (STM), especially in terms of its temperature dependency. A dramatic topographic change was observed around 725 K, which is most likely due to the oxygen desorption into the gas phase and the simultaneous diffusion of Ti into the bulk. The atomically resolved STM images show a strong dependency on the tip composition and allow a double-bridging oxygen vacancy to be identified. The nucleation and growth of Pd on the ${\mathrm{TiO}}_{2}(110)$ surface have also been studied at the nucleation stage with atomic resolution. Both dimer and tetramer Pd clusters have been observed; however no single Pd atoms were detected. These results support the ``classical'' nucleation model which assumes that only monomers are mobile, whereas dimers are stable nuclei. A marked preferential nucleation and growth of Pd clusters at step edges have also been observed. In addition to topographic structures, the local electronic properties of the Pd clusters have been studied to relate cluster structure to electronic composition.read more
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Journal ArticleDOI
The surface science of titanium dioxide
TL;DR: Titanium dioxide is the most investigated single-crystalline system in the surface science of metal oxides, and the literature on rutile (1.1) and anatase surfaces is reviewed in this paper.
Journal ArticleDOI
Onset of Catalytic Activity of Gold Clusters on Titania with the Appearance of Nonmetallic Properties
Mika Valden,X. Lai,D. W. Goodman +2 more
TL;DR: Results suggest that supported clusters, in general, may have unusual catalytic properties as one dimension of the cluster becomes smaller than three atomic spacings.
Journal ArticleDOI
Interaction of nanostructured metal overlayers with oxide surfaces
Qiang Fu,Thomas Wagner +1 more
TL;DR: In this paper, a review of metal-oxide interfaces at temperatures below 1000 ǫC is presented, with special emphasis on model systems like ultrathin metal overlayers or metal nanoclusters supported on well-defined oxide surfaces.
Journal ArticleDOI
Oxygen vacancies on TiO2(110) and their interaction with H2O and O2: A combined high-resolution STM and DFT study
Stefan Wendt,Renald Schaub,J. Matthiesen,Ebbe K. Vestergaard,Erik Wahlström,Maria Rasmussen,P. Thostrup,Luis M. Molina,Erik Lægsgaard,Ivan Stensgaard,Bjørk Hammer,Flemming Besenbacher +11 more
TL;DR: From an interplay between high-resolution scanning tunneling microscopy (STM) and density functional theory (DFT), the authors in this paper discuss the origin of various point defects on reduced rutile TiO2(1/1/0)-(1 × 1) surfaces.
Journal ArticleDOI
Size‐Dependent Chemistry: Properties of Nanocrystals
TL;DR: This article examines the size dependent electronic structure and properties of nanocrystals of semiconductors and metals to illustrate this aspect and discusses the chemical reactivity of metal nanocry crystals which is strongly dependent on the size.
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