Photoluminescence Studies of Nanotitania with Hexagonal Morphology Synthesized by Microwave Irradiation Technique

TiO2 nanostructures with hexagon like morphology was synthesized by a simple microwave assisted alkali hydrolysis of TiCl3. Tuning the morphology was achieved by the microwave treatment and the nature of the medium or the precipitating agent. As-synthesized titania nanohexagons, was characterized by X-ray diffraction (XRD), UV-Visible spectroscopy, Infrared spectroscopy (IR) and Scanning Electron Microscopy (SEM). The as-prepared TiO2 nanohexagons appear to be single crystalline phase and the diameter is about 18.73 nm. The Photoluminescence (PL) emission spectra reveals that the strong emission in the region of 360–365 nm is assigned due to the exciton emission originating from the recombination of a hole with an electron, whereas the weak and broad emission peaks in the region of 400–500 nm is just a surface state emission originating from the trapped or excess surface states.