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          Institute: Fritz-Haber-Institut     Collection: Chemical Physics     Display Documents



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ID: 258908.0, Fritz-Haber-Institut / Chemical Physics
Influence of the metal substrate on the adsorption properties of thin oxide layers: Au atoms on a thin alumina film on NiAl(110)
Authors:Kulawik, Maria; Nilius, Niklas; Freund, Hans-Joachim
Language:English
Date of Publication (YYYY-MM-DD):2006-01-27
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys. Rev. Lett.
Volume:96
Issue / Number:3
Start Page:036103–1
End Page:036103–4
Copyright:© 2006 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Thin oxide films grown on metal substrates are widely used in surface science to model bulk oxides, assuming their chemical and electronic properties to be similar. In some cases, however, this might not be justified as the present scanning tunneling microscopy studies demonstrate for Au atoms on a thin alumina film on NiAl(110). Au atoms were evaporated onto the oxide film at a sample temperature of similar to ~10 K. At low coverage, this leads to the formation of one-dimensional clusters with unusually large Au–Au distances of 5.6–6.0 Å. A direct interaction between the Au atoms can be excluded, and a substrate-mediated mechanism is supposed instead. This assumption is strengthened by the finding that the Au chains exhibit a preferential orientation: They are almost aligned with the [001] direction of the NiAl(110) substrate, clearly indicating that the metal substrate participates in the binding of the Au atoms.
Free Keywords:alumina; gold; adsorption; metal clusters; scanning tunnelling microscopy; insulating thin films
External Publication Status:published
Document Type:Article
Communicated by:Hans-Joachim Freund
Affiliations:Fritz-Haber-Institut/Chemical Physics/Scanning Probe Spectroscopy
Fritz-Haber-Institut/Chemical Physics/Chemical Physics
Identifiers:URL:http://link.aps.org/abstract/PRL/v96/e036103
DOI:10.1103/PhysRevLett.96.036103
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