LAUSR

Abstract In the present work, we report photoluminescence properties of TiO2 nanoparticles synthesized by chemical co-precipitation method using titanium oxysulphate and sodium hydroxide as a primary sources. The nanopowder is calcinated at different temperatures (300 °C,400 °C, 500 °C and 600 °C). The effect of calcination temperature on structural, morphological and optical properties of TiO2 nanopowder is investigated through XRD, FESEM, EDX, FTIR, UV–Vis absorption and fluorescence emission spectroscopy. XRD spectra confirms the formation of TiO2 in anatase phase and degree of crystallinity of samples increases with calcination temperature. At 6000C the phase transition from anatase to anatase-rutile mixed phase is noticed. The FESEM shows the nanophase with irregular morphology of the particles. EDX and FTIR spectra confirms the formation of TiO2 in crystalline phase. The absorption spectra shows strong quantization up to 10 nm in contrast to earlier studies and is explained by indirect band transition rather than direct interband transition. Photoluminescence spectra exhibits the change in intensity and peak position with calcination temperature and is in accordance with indirect transition.