Abstract
In this work, the TiO2 films were deposited on glass substrates using a paste mixture by spin coating method and heat treatment at temperature of 400°C and 500°C for 3hrs, respectively. The crystal structure, optical property, composition and surface morphology of the films thus prepared were characterized by x-ray diffractometry (XRD), UV-Vis spectra, X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM). In addition, the hydrophilicity of the films was evaluated by optical contact angle measurements (OCA). The XRD results indicate that the sample post-annealed at 500°C has higher quality of crystallization. The UV-Vis spectrum shows that absorptions of the three samples in visible light region are almost the same. The band gaps of samples without post-anneal, post-annealed at 400°C and 500°C calculated from UV-Vis spectra is 3.1eV, 3.17eV and 3.19eV, respectively. The surface of sample annealed at 500°C is smoothed, post-anneal also increases the size of particles and changes the shape of particles. Then, the sample post-annealed at 500°C has better hydrophilicity than the other samples.
