Figure 3. TEM images and the corresponding electron diffraction (ED) patterns
of a) mesoporous pure TiO2 film (sample A) calcined at 450 8C; and
b) mesoporous TiO2/SiO2 hybrid film prepared with the molar ratio of PVP/
TTIP/TEOS 1.0:4.0 :1.0 (sample B) calcined at 4508C.