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

Over, H; Seitsonen, AP; Lundgren, Edvin LU ; Schmid, M and Varga, P (2002) In Surface Science 515(1). p.143-156
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)... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
oxygen, carbon monoxide, ruthenium, chemical reaction, surface, density functional calculations, scanning tunneling microscopy, low index single, crystal surfaces
in
Surface Science
volume
515
issue
1
pages
143 - 156
publisher
Elsevier
external identifiers
  • wos:000177735900019
  • scopus:0036682968
ISSN
0039-6028
DOI
10.1016/S0039-6028(02)01853-8
language
English
LU publication?
yes
id
25212cd6-817b-4315-940a-c26828f374d2 (old id 329338)
date added to LUP
2007-11-08 09:14:39
date last changed
2017-08-13 04:20:55
@article{25212cd6-817b-4315-940a-c26828f374d2,
  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.},
  author       = {Over, H and Seitsonen, AP and Lundgren, Edvin and Schmid, M and Varga, P},
  issn         = {0039-6028},
  keyword      = {oxygen,carbon monoxide,ruthenium,chemical reaction,surface,density functional calculations,scanning tunneling microscopy,low index single,crystal surfaces},
  language     = {eng},
  number       = {1},
  pages        = {143--156},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Experimental and simulated STM images of stoichiometric and partially reduced RuO2(110) surfaces including adsorbates},
  url          = {http://dx.doi.org/10.1016/S0039-6028(02)01853-8},
  volume       = {515},
  year         = {2002},
}