Bonding of gold nanoclusters to oxygen vacancies on rutile TiO2(110)

E. Wahlström (Editor), Nuria Lopez, R. schaub, P. Thostrup, A. Rønnau, C. Africh, E. Lægsgaard, Jens Kehlet Nørskov, Flemming Besenbacher

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Abstract

Through an interplay between scanning tunneling microscopy (STM) and density functional theory (DFT) calculations, we show that bridging oxygen vacancies are the active nucleation sites for Au clusters on the rutile TiO2(110) surface. We find that a direct correlation exists between a decrease in density of vacancies and the amount of Au deposited. From the DFT calculations we find that the oxygen vacancy is indeed the strongest Au binding site. We show both experimentally and theoretically that a single oxygen vacancy can bind 3 Au atoms on average. In view of the presented results, a new growth model for the TiO2(110) system involving vacancy-cluster complex diffusion is presented.
Original languageEnglish
JournalPhysical Review Letters
Volume90
Issue number2
Pages (from-to)026101
ISSN0031-9007
DOIs
Publication statusPublished - 2003

Bibliographical note

Copyright (2003) American Physical Society

Keywords

  • CATALYSTS
  • CLUSTERS
  • SURFACE
  • AU
  • TIO2
  • GROWTH

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