Composition Dependence of Microstructure, Phonon Modes, and Optical Properties in Rutile TiO2:Fe Nanocrystalline Films Prepared by a Nonhydrolytic Sol−Gel Route
| Autor: | Yude Shen, J. H. Chu, Zhubin Hu, Jian Zhang, Yawei Li |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Phonon business.industry Analytical chemistry Microstructure Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry.chemical_compound General Energy Optics chemistry Rutile Titanium dioxide symbols Crystallite Physical and Theoretical Chemistry business Raman scattering Sol-gel |
| Zdroj: | The Journal of Physical Chemistry C. 114:15157-15164 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp1056286 |
| Popis: | Iron-doped titanium dioxide nanocrystalline (nc-TiO2:Fe) films with the a composition from 2 to 10% have been deposited on Si(100) substrates by a facile nonhydrolytic sol−gel route. X-ray diffraction analysis shows that the films are polycrystalline and exhibit the pure tetragonal rutile phase structure. The Fe dopant effects on the surface morphology, microstructure, phonon modes, and dielectric functions of the nc-TiO2:Fe films have been investigated by atomic force microscopy, ultraviolet Raman scattering, far-infrared reflectance, and spectroscopic ellipsometry at room temperature. With increasing Fe composition, the first-order Raman-active phonon modes Eg, A1g, and B2g are shifted toward a lower frequency side of 10, 6, and 7 cm−1, respectively. The four additional vibrations, which are strongly related to the surface structure of the films, can be observed due to the two-phonon scattering process. Moreover, the three infrared-active transverse-optic (TO) phonon modes Eu (TO) can be located at abou... |
| Databáze: | OpenAIRE |
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