Identification of bulk and surface sulfur impurities in Ti O2 by synchrotron x-ray absorption near edge structure

Smith, M. F., Setwong, K., Tongpool, R., Onkaw, D., Na-Phattalung, S., Limpijumnong, S. and Rujirawat, S. (2007) Identification of bulk and surface sulfur impurities in Ti O2 by synchrotron x-ray absorption near edge structure. Applied Physics Letters, 91 14: 142107.1-142107.3. doi:10.1063/1.2793627

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Author Smith, M. F.
Setwong, K.
Tongpool, R.
Onkaw, D.
Na-Phattalung, S.
Limpijumnong, S.
Rujirawat, S.
Title Identification of bulk and surface sulfur impurities in Ti O2 by synchrotron x-ray absorption near edge structure
Formatted title
Identification of bulk and surface sulfur impurities in TiO2 by synchrotron x-ray absorption near edge structure
Journal name Applied Physics Letters   Check publisher's open access policy
ISSN 0003-6951
1077-3118
Publication date 2007-10-01
Sub-type Article (original research)
DOI 10.1063/1.2793627
Open Access Status File (Publisher version)
Volume 91
Issue 14
Start page 142107.1
End page 142107.3
Total pages 3
Place of publication College Park, MD, U.S.A.
Publisher American Institute of Physics
Language eng
Formatted abstract
Synchrotron x-ray absorption near edge structure (XANES) measurements of Ti and S K edges, combined with first principles simulations, are used to characterize S-doped TiO2 prepared by oxidative annealing of TiS2 at various temperatures. Ti-edge XANES and x-ray powder diffraction data indicate that samples annealed above 300 °C have an anatase TiO2 crystal structure with no trace of TiS2 domains. S-edge XANES data reveal that the local structure seen by S atoms evolves gradually, from TiS2 to a qualitatively different structure, as the annealing temperature is increased from 200 to 500 °C. For samples annealed at 500 °C, the spectrum appears to have features that can be assigned to S on the surface in the form of SO4 and S defects in the bulk (most likely S interstitials) of TiO2.
Keyword Physics, Applied
Titanium-dioxide
Doped Tio2
Photocatalysis
Xanes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Tue, 19 Feb 2008, 01:18:27 EST