Structural and Optical Characteristics Transformation in the Sol-Gel Synthesized Pure Titanium Dioxide

The TiO2 nanocrystals gaining wide spread attention in research in the field of solar cells, biosensors and photo catalysts due to its remarkable optical and electrical properties. In this present work the titanium dioxide nano crystals were synthesized by using titanium isopropoxide as precursor and isopropyl alcohol as solvent. The ratio of the precursor and the solvent were controlled to bring out the sol-gel. The analysis was carried out for as synthesized sample and the sample annealed at 450 °C, reviles the anatase to rutile phase transformation. SEM photograph confirms the transformation due to annealing. The XRD pattern shows both the samples are in nanoscale with average grain size of 7 nm and 17 nm respectively. The EDX shows the prepared samples are titanium dioxide without any impurity. The UV-Vis absorption study shows that the annealing decreases the band gap of TiO2.