Abstract
In this study, we report the effects of Na+ diffusion into TiO2 during thermal annealing on TiO2 photocatalysis. After annealing at 500 °C for 1 h, the photoactivity of colloidal sol-based crystalline TiO2 is almost similar regardless of substrates. Interestingly, after the annealing the photoactivity of polymeric sol-based amorphous TiO2 thin film on soda lime glass (SLG) is significantly reduced compared to that on quartz. We observed that Na+ does not easily bond with TiOTi in crystalline TiO2, while large amount of TiONa bonds are formed in the amorphous TiO2 on SLG during crystallization at 500 °C. Our results suggest that the control of TiO2 photoactivity has applications in improving photo-stability of various optoelectronic devices.
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