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Probing the influence from residual Ti interstitials on water adsorption on TiO2(110)

Walle, L. E.; Borg, A.; Uvdal, Per LU and Sandell, A. (2012) In Physical Review B (Condensed Matter and Materials Physics) 86(20).
Abstract
Reduced, stoichiometric and oxidized TiO2(110) surfaces have been compared using valence photoelectron spectroscopy. The results show that the intensity from the band-gap state carries contributions from both oxygen surface vacancies and residual Ti interstitials, present after the sample cleaning procedure. The density of Ti interstitials was found to be 0.05 +/- 0.02 monlayers (ML), while the density of oxygen vacancies was estimated to 0.09 +/- 0.01 ML. Both these values are in good agreement with previous STM studies. O 1s core-level photoelectron spectra show that oxidation of the interstitials had negligible effect on the OH-H2O balance within the first water layer. The characteristic OH-H2O balance found on a surface free from... (More)
Reduced, stoichiometric and oxidized TiO2(110) surfaces have been compared using valence photoelectron spectroscopy. The results show that the intensity from the band-gap state carries contributions from both oxygen surface vacancies and residual Ti interstitials, present after the sample cleaning procedure. The density of Ti interstitials was found to be 0.05 +/- 0.02 monlayers (ML), while the density of oxygen vacancies was estimated to 0.09 +/- 0.01 ML. Both these values are in good agreement with previous STM studies. O 1s core-level photoelectron spectra show that oxidation of the interstitials had negligible effect on the OH-H2O balance within the first water layer. The characteristic OH-H2O balance found on a surface free from oxygen vacancies previously reported [Walle et al., Phys. Rev. B 80, 235436 (2009)] is therefore an inherent property of the TiO2(110) surface; that is, the primary mechanism leading to partial dissociation is not related to the presence of residual Ti interstitials. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
86
issue
20
publisher
American Physical Society
external identifiers
  • wos:000310868000004
  • scopus:84869066857
ISSN
1098-0121
DOI
10.1103/PhysRevB.86.205415
language
English
LU publication?
yes
id
67632d9e-12f9-4b3f-97c4-46b52d06b09d (old id 3256343)
date added to LUP
2012-12-27 09:19:08
date last changed
2017-08-27 04:54:07
@article{67632d9e-12f9-4b3f-97c4-46b52d06b09d,
  abstract     = {Reduced, stoichiometric and oxidized TiO2(110) surfaces have been compared using valence photoelectron spectroscopy. The results show that the intensity from the band-gap state carries contributions from both oxygen surface vacancies and residual Ti interstitials, present after the sample cleaning procedure. The density of Ti interstitials was found to be 0.05 +/- 0.02 monlayers (ML), while the density of oxygen vacancies was estimated to 0.09 +/- 0.01 ML. Both these values are in good agreement with previous STM studies. O 1s core-level photoelectron spectra show that oxidation of the interstitials had negligible effect on the OH-H2O balance within the first water layer. The characteristic OH-H2O balance found on a surface free from oxygen vacancies previously reported [Walle et al., Phys. Rev. B 80, 235436 (2009)] is therefore an inherent property of the TiO2(110) surface; that is, the primary mechanism leading to partial dissociation is not related to the presence of residual Ti interstitials.},
  articleno    = {205415},
  author       = {Walle, L. E. and Borg, A. and Uvdal, Per and Sandell, A.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {20},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Probing the influence from residual Ti interstitials on water adsorption on TiO2(110)},
  url          = {http://dx.doi.org/10.1103/PhysRevB.86.205415},
  volume       = {86},
  year         = {2012},
}