367510.fig.001
Figure 1: SEM images of (a) a-TiO2 nansol film, (b) P-25 TiO2 film, (c) ST-01 film, and (d) ST-21 film, ((e), (f), (g), and (h)) SEM images at higher magnification (×20,000) of samples (a), (b), (c), and (d), respectively.