Premium
Raman spectroscopy of sol–gel derived titanium oxide thin films
Author(s) -
Wang Xiaodong,
Shen Jun,
Pan Qiang
Publication year - 2011
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2899
Subject(s) - raman spectroscopy , anatase , rutile , materials science , annealing (glass) , analytical chemistry (journal) , thin film , crystallization , sol gel , spectroscopy , chemistry , optics , nanotechnology , photocatalysis , biochemistry , physics , organic chemistry , chromatography , quantum mechanics , composite material , catalysis
Raman spectra of TiO 2 films prepared via the sol–gel process were studied by UV and visible Raman spectroscopy. The evolution of the phases of TiO 2 films during annealing was investigated, and the relative intensities of the Raman bands excited with 325 nm were found to be distinct from those of the bands excited with 514 nm. The transmittance and FTIR spectra of the films annealed at different temperatures were characterized. The crystallization process of the powders and thin films treated by different annealing methods were also studied with Raman spectroscopy. The results show that the change in the relative intensities is caused by the resonance Raman effect. The anatase to rutile transition of the powder occurs at 700 °C, while that of the thin film occurs at 800 °C. The analysis of Raman band shape (peak position and full width at half‐maximum) after conventional furnace annealing and rapid thermal annealing indicates the influence of the non‐stoichiometry and phonon confinement effect. Copyright © 2011 John Wiley & Sons, Ltd.