Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 139, Issue 2-3, Pages 543-549Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2013.01.055
Keywords
Nanostructures; Oxides; XAFS; Crystal structure; Phase transitions
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Funding
- Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand
- Suranaree University of Technology
- Higher Education Research Promotion and National Research University Project, Office of Higher Education Commission
- Kasetsart University Research and Development Institute
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The crystal and electronic structural changes undergone by TiO2 nanoparticles when Ce is introduced were studied using X-ray diffraction (XRD) and X-ray absorption near-edge spectroscopy (XANES). A small amount of Ce (less than 1% molar concentration) resulted in i/a significant reduction of the average size of the TiO2 nanoparticles and ii/a phase transition in which brookite replaced rutile as the minority phase component (anatase was the majority phase component at all Ce concentrations studied up to 10% molar concentration). The Ce L3 edge >CANES revealed changes in the local environment of Ce impurities. As Ce concentration was increased the fraction of Ce that have formal valence of +3 decreased and, for the remaining Ce with valence +4, the 4f orbitals became less-strongly hybridized with the p-orbitals of oxygen neighbors. The results have implications for photocatalytic and gas sensing properties of Ce-doped TiO2. (C) 2013 Elsevier B.V. All rights reserved.
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