RAMAN STUDY OF VANADIUM-DOPED TITANIA NANOPOWDERS SYNTHESIZED BY SOL-GEL METHOD
Abstract
Pure titania (TiO2) nanopowders and TiO2 doped with 10 mol % of vanadium ions (V3+) are synthesized by sol-gel method. The dependence of structural characteristics of nanopowders on synthesis conditions is investigated by X-ray diffraction and Raman spectroscopy. Very intensive modes observed in Raman spectra of all nanopowders are assigned to anatase phase of TiO2. Additional Raman modes of extremely low intensity which can be related to the presence of small amount of brookite amorphous phase are observed in pure TiO2 nanopowders. In V-doped nanopowders anatase was the only TiO2 phase detected. The variations in duration and heating rate of calcination influence slightly the Raman spectra of pure TiO2, but have a great impact on Raman modes of anatase, as well as the additional Raman modes related to the presence of vanadium oxides in V-doped samples.
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