Effect of annealing temperature on Raman spectra of TiO2 nanoparticles

[Display omitted] ► The average crystallite size of TiO2 nanoparticles is in the range 19–68nm. ► Shifts of Raman bands remain unaffected by variation in crystallite size. ► The anomalous behavior has been observed in Raman spectrum. Sol–gel method has been used to prepare pure anatase and anatase–r...

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Bibliographic Details
Published in:Chemical physics letters 2013-01, Vol.555, p.182-186
Main Authors: Mathpal, Mohan Chandra, Tripathi, Anand Kumar, Singh, Manish Kumar, Gairola, S.P., Pandey, S.N., Agarwal, Arvind
Format: Article
Language:English
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Summary:[Display omitted] ► The average crystallite size of TiO2 nanoparticles is in the range 19–68nm. ► Shifts of Raman bands remain unaffected by variation in crystallite size. ► The anomalous behavior has been observed in Raman spectrum. Sol–gel method has been used to prepare pure anatase and anatase–rutile mixed phase TiO2 nanoparticles by calcination at different temperatures. The influences of calcination temperature on structure, band gap, luminescence properties and Raman spectra have been investigated. A clear evidence of structural transformation from pure anatase to anatase–rutile mixed phase structures has been confirmed by X-ray diffraction (XRD). Photoluminescence spectroscopy (PL) shows that the change in structure is also responsible for exhibiting the change in PL intensity. The Raman spectroscopy exhibits the anomalous behavior for band broadening and shifting of Raman bands with increasing crystallite size.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2012.10.082