This could be that the 5 wt% sheet contained minimal
amount of latex barely sufficient to provide full coverage of all TiO2
particles at the surface and to fill all the void spaces between particles
(Fig. 4a and d). It has been known that the surface roughness
and the porous structure are very important for the photocatalytic
activity of TiO2 films [1] since the photocatalytic activity would be
increased with the enhanced surface morphology by the roughness
and the porous structure.
The EDS analysis was carried