INFLUENCE OF TITANIUM TETRAISOPROPOXIDE CONCENTRATION ON THE ANTIBACTERIAL ACTIVITY OF TiO2 THIN FILMS

In this study, titanium dioxide thin films were successfully prepared via sol-gel method. Titanium tetraisopropoxide (TTIP) as a precursor solution was used to prepare different concentrations and deposited by spin coating. All prepared films were inspected by X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). XRD patterns show that all samples have anatase crystal structure. Transmittance spectra were measured by using UV-Vis spectrophotometer. The optical band gaps were 3.55, 3.62 and 3.78 eV for TTIP concentrations of 6, 6.3 and 6.6 ml, respectively. Antibacterial activity of TiO2 films against S. aureus and E. coli was evaluated by international recognized test (JIS Z 2801). The test revealed incrementally increase in antibacterial activity of the films with TTIP concentrations activated by UV light.