Small Au and Pt clusters at the anatase TiO2(101) surface: behavior at terraces, steps, and surface oxygen vacancies.

Full Abstract

The adsorption properties of Au and Pt metal nanoclusters on TiO2 anatase (101) were calculated using density functional theory. Structures and energetics of adsorbed Au and Pt monomers, dimers, and trimers at clean anatase TiO2(101) terraces and two major step edges, as well as O-vacancies, were systematically determined. The theoretical predictions were tested by vapor-depositing small coverages of Au and Pt on anatase (101) and investigating the resulting clusters with Scanning Tunneling Microscopy. On the clean surface, Au shows a strong tendency to form large clusters that nucleate on step edges. A preference for adsorption at type D-(112) steps is observed, which is probably a result of kinetic effects. For Pt, clusters as small as monomers are observed on the terraces, in agreement with the predicted large binding energy of 2.2 eV. Step edges play a less important role than in the case of Au. Oxygen vacancies, produced by electron irradiation, dramatically influence the growth of Au, while the nucleation behavior of Pt was found to be less affected.

Learn Faster Today Improve your study skills

Author information

Author/s: Gong, Xue-Qing (XQ); Selloni, Annabella (A); Dulub, Olga (O); Jacobson, Peter (P); Diebold, Ulrike (U);

Affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, and Department of Physics, Tulane University, New Orleans, Louisiana 70118, USA. xgong(-atsign-)ecust.edu.cn

Journal and publication information

Publication Type: Journal Article

Journal: Journal of the American Chemical Society (J Am Chem Soc), published in United States. (Language: eng)

Reference: 2008-Jan; vol 130 (issue 1) : pp 370-81

Dates: Created 2008/01/02; Completed 2008/01/25;

PMID: 18069837, status: PubMed-not-MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

External Links for this article (including full text providers, if available):

Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.

This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.

MeSH headings (categories)

This article was linked to the MESH Headings shown below.

No MeSH Headings found.

The article may not be MeSH Indexed as yet.

This article has not been indexed for related articles as yet, however you can still use the live related article search links below.

See 100+ related articles.