Figs. 8a and b shows the SEM and three dimensional AFM images of as deposited TiO2 thin film on FTO glass plate. The scanning electron microscope image shown in Fig. 8a revealed that the TiO2 film is composed with high degree of porosity. The thickness of the TiO2 film coated on FTO glass plate was found to be about 20 ± 2 lm by surface profilometer technique. The AFM image shown in Fig. 8b indicated that the surface of the TiO2 thin film was smooth with estimated root mean square (RMS) roughness of 14 nm and the size of the TiO2 nanoparticles are found to be around 24 nm in average.