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Experimental and simulated STM images of stoichiometric and partially reduced RuO2(110) surfaces including adsorbates

MPS-Authors
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Over,  H.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;
Miscellaneous, Max Planck Institute for Solid State Research, Max Planck Society;

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Seitsonen,  A. P.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280482

Schmid,  M.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Over, H., Seitsonen, A. P., Lundgren, E., Schmid, M., & Varga, P. (2002). Experimental and simulated STM images of stoichiometric and partially reduced RuO2(110) surfaces including adsorbates. Surface Science, 515(1), 143-156.


Cite as: https://hdl.handle.net/21.11116/0000-000E-E975-8
Abstract
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 0
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. (C) 2002 Elsevier Science B.V. All
rights reserved.