Document Type: Original Research Paper
Biomaterials Dep, University of Toronto
In this project, the TiO2 nano-rods were synthesized from P25 TiO2 nanoparticles by hydrothermal method in 20 M NaOH solution. The effects of annealing temperatures on produced nanorods were investigated by scanning electron microscopy (SEM) X-ray diffraction (XRD) and photoluminescence (PL) spectroscopy. Diameter growth and changes of surface oxygen defects of synthesized Nano rods are studied with increasing annealing temperatures. Also, with Increase of annealing temperature over 300 °C there is no effect on the size of produced nano-rods, but due to reducing of the surface charge causes the more compact products. In summation, the effects of post heat treatment temperatures were in detail investigated by SEM, XRD and PL spectroscopy. The obtained results were shown that the increasing of annealing temperature until 300 °C causes increase of thicknesses of prepared nanorods by hydrothermal method. Increase of annealing temperature over 300 °C has no effect on the size of produced nanorods, but due to reducing of the surface charge causes the more compact products. In addition, the surface defects of synthesized 1D TiO2 were decreased because of increase of annealing temperatures, but we should note that at higher tempera tures (over 500 °C) the TiO2 phase may be converted from anatase to rutile.