Optical Properties of Titanium-di-Oxide (TiO_2) Prepared by Hydrothermal Method

摘要

Research on titanate and its derived TiO_2 nanostructures with large specific surface area have received great attention due to their enhanced efficiency in photocatalysis, DSSC etc. Here, in this communication TiO_2 powder has been prepared by hydrothermal method at 180 °C. In this work we have shown the changes in optical properties of the powder with two different sintering temperatures - 500 °C and 800 °C. The as prepared powder was also studied. FESEM images show spherical particles for the as prepared samples which look more like agglomeration after sintering. Band gaps of the prepared samples were calculated from UV-Vis spectroscopy which lies in the range 2.85 eV - 3.13 eV. The photoluminescence (PL) spectra of the prepared samples were recorded at room temperature in the range of 300-700 nm. It shows two distinct peaks at 412 nm and 425 nm.