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Erschienen in:
28.09.2016
Co-precipitation synthesis of V-doped titania: influence of vanadium concentration on the structural and optical properties
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 2/2017
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Abstract
V-doped TiO2 nanoparticles with different proportions were prepared by co-precipitation method. XRD patterns indicate that the TiO2 nanoparticles obtained after calcination at 500 °C in air has the anatase phase with a tetragonal structure and the crystallite sizes were in the range 11.4–9.5 nm, which are consistent with the results obtained from TEM images. The functional groups present in the samples were identified by FTIR study. From the optical studies, there is a blue shift in the absorption edge for our samples that can be attributed to the presence of V in the TiO2. For V doped TiO2 nanoparticles the optical band gap varies between 3.19 and 2.83 eV with the increase of V concentration. It was found that the doping V5+ ions have a significant influence on the optical properties. The room temperature photoluminescence (PL) spectra showed characteristic UV emission peaks of anatase at 529 nm and appropriate amount of V doping could slow the radiative recombination process of photogenerated electrons and holes in TiO2.