Homogeneous and transparent sulfur and nitrogen (S, N)-codoped TiO2 nanocrystalline thin films were
deposited on glass substrates by sol gel dip coating method using thiourea (Tu) as a source of sulfur
and nitrogen. The surface structure of the films was modified by addition of different concentrations
of polyethylene glycol (PEG) into the TiO2 sol. The equal powders of pure and modified TiO2 were also
prepared to compare of their photocatalytic activity with films.