| Autor: |
Attera Worayingyong, Sutasinee Kityakarn, Anwaraporn Suramitr, M.F. Smith |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Materials Chemistry and Physics. 139:543-549 |
| ISSN: |
0254-0584 |
| DOI: |
10.1016/j.matchemphys.2013.01.055 |
| Popis: |
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 XANES 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect