TiO2 thin film with nanoporous structure are prepared from colloidal suspension containing polyethylen glycol (PEG) via Sol-Gel method. The effect of PEG addition to the precursor solution on the surface structures and photocatalytic activity of the resultant thin films are studied. The larger the amount of PEG added to to the precursor solution, the larger the size and number of pores produced in the resultant films when PEG added to the gel films decomposed completely during heat-treatment. The photocurrent of such porous thin film is found to increase with increasing amount of PEG up to 30% weigh of TiO2. Photocatalytic degradation experiments show that eosin, methyl orange is efficiently decolorized in the presence of the TiO2 films by exposing its aqueous solution to UV light and the suitable surface structures remarkably enhance the photocatalytic activity of TiO2 films.
