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Titanium dioxide nanoparticles, TiO2 were synthesized with hydrothermal method via alkaline fusion process by using synthetic rutile. The synthetic rutile was derived from the local mineral, ilmenite which was used to produce TiO2 nanopowder. The effect of heat treatment with different temperatures (600, 800 and 1000˚C) on optical properties of synthesized TiO2 was investigated by UV-Vis spectrometer and Photoluminescence spectrometer, PL. The UV-Vis spectroscopy results revealed that the energy band gap slightly increase from 3.209 to 3.232 eV. Whereas the Photoluminescence spectrometer, PL results showed at the emission peak between 428nm and 452nm the intensity decreased and slightly red shift occurred. These results showed the changes of atomic structure from anatase crystallite structure to rutile crystallite structure. The obtained results have shown that the increase of temperature causes the phase transformation from anatase to rutile. [ABSTRACT FROM AUTHOR]

This work investigated the effect on 5 wt% addition of TiO2 nanoparticles (NPs) on the optical absorption characteristics of Poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT). Both materials were mixed using solution blending method and then spin coated onto ITO-coated glass substrate at 1000 rpm for 30s. The optical properties of the nanocomposite were determined using UV-Vis spectroscopy. Compares to pristine film, the absorption peak of the nanocomposite film improved and shifted to longer wavelength indicating reduction in the direct and indirect band gaps. Better optophysical properties of F8BT/TiO2 nanocomposites is believed due to compatible band structures and efficient charge trapping effect displayed by the NPs. [ABSTRACT FROM AUTHOR]