TiO2/Ag nanostructured porous films were prepared by spin coating of P25 TiO2/colloidal silica on glass
substrate and subsequent photochemical deposition of silver nanoparticles (AgNPs). The adhesion
strength of the film on glass substrate was evaluated and the result indicated that porous films formed
on the glass substrates were robust and durable. The porous structure of TiO2/SiO2 film facilitated the
implantation of uniformly dispersed AgNPs having sizes generally less than 10 nm. By acting as electron
scavengers, AgNPs effectively provided an alternative electron transfer route, thus enhancing the photocatalytic
efficiency for degradation of methylene blue (MB). Compared with the bare TiO2 film derived
from P25, TiO2/Ag porous films showed an improved photo catalytic activity. This conclusion was further
supported by photo current density measurements on the films. The study also demonstrated experimentally
that TiO2/Ag porous films had sustained stability with the photo catalysis maintaining its original
activity after at least four consecutive reaction cycles.