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Originally published in Science Express on 12 December 2002
Science 17 January 2003:
Vol. 299. no. 5605, pp. 377 - 379
DOI: 10.1126/science.1078962
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Reports

Oxygen-Mediated Diffusion of Oxygen Vacancies on the TiO2(110) Surface

Renald Schaub, Erik Wahlström, Anders Rønnau, Erik Lægsgaard, Ivan Stensgaard, Flemming Besenbacher*

Defects such as oxygen vacancies play a crucial role in the surface properties of transition metal oxides. By means of time-resolved, high-resolution scanning tunneling microscopy, we unraveled an adsorbate-mediated diffusion mechanism of oxygen vacancies on rutile TiO2(110). Adsorbed oxygen molecules mediate vacancy diffusion through the loss of an oxygen atom to a vacancy and the sequential capture of an oxygen atom from a neighboring bridging oxygen row, leading to an anisotropic oxygen vacancy diffusion pathway perpendicular to the bridging oxygen rows.

Interdisciplinary Nanoscience Center, Department of Physics and Astronomy and CAMP, University of Aarhus, DK-8000 Aarhus C, Denmark.
*   To whom correspondence should be addressed. E-mail: fbe{at}phys.au.dk

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Electron Localization Determines Defect Formation on Ceria Substrates.
F. Esch, S. Fabris, L. Zhou, T. Montini, C. Africh, P. Fornasiero, G. Comelli, and R. Rosei (2005)
Science 309, 752-755
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Electron Transfer-Induced Dynamics of Oxygen Molecules on the TiO2(110) Surface.
E. Wahlstrom, E. K. Vestergaard, R. Schaub, A. Ronnau, M. Vestergaard, E. Laegsgaard, I. Stensgaard, and F. Besenbacher (2004)
Science 303, 511-513
   Abstract »    Full Text »    PDF »


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