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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 8809.0, Fritz-Haber-Institut / Physical Chemistry
Experimental and simulated STM images of stoichiometric and partially reduced RuO2(110) surfaces including adsorbates
Authors:Over, Herbert; Seitsonen, Ari P.; Lundgren, Edvin; Schmid, Michael; Varga, Peter
Date of Publication (YYYY-MM-DD):2002-08-20
Title of Journal:Surface Science
Journal Abbrev.:Surf. Sci.
Issue / Number:1
Start Page:143
End Page:156
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present experimental and DFT-simulated STM images of ultrathin RuO2(110) films on Ru(0001), including adsorbates such as oxygen and CO. We are able to identify the under-coordinated O atoms on the RuO2(110) surface with STM, i.e. the bridging O atoms and the on-top O atoms. The partial reduction of the RuO2(110) surface by CO exposure at room temperature leads to a surface where part of the bridging O atoms have been removed and some of the vacancies are occupied by bridging CO. When dosing 10 L of CO at room temperature, the RuO2(110) surface becomes fully mildly reduced in that all bridging O atoms are replaced by bridging CO molecules. Annealing the surface to 600 K produces holes on the terraces of such a mildly reduced RuO2(110) surface. These pits are not generated by the recombination of lattice O with CO, but rather these pits are assigned to a complex temperature-induced rearrangement of surface atoms in the topmost RuO2 double layer of RuO2(110). With this process the bridging O atoms are again populated and surplus Ru atoms agglomerate in small islands at the rims of the holes.
Free Keywords:Density functional calculations; Scanning tunneling microscopy; Surface chemical reaction; Ruthenium; Carbon monoxide; Oxygen; Low index single crystal surfaces
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
MPI für Festkörperforschung
External Affiliations:Over H, Univ Giessen, Dept Phys Chem, Heinrich Buff Ring 58, D-35392 Giessen, Germany;

Lund E, Inst Phys, Dept Synchrotron Radiat Res, SE-22100 Lund, Sweden;
Schmid M, Varga P, Vienna Tech Univ, Inst Allgemeine Phys, A-1040 Vienna, Austria
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