Red shift of absorption spectra of metal-doped TiO₂ coatings

The effect of metal elements doping (Cu, Fe, Ni, V, Cr) on the shift of the absorption spectra of the titanium dioxide composite coatings was studied experimentally. It is shown that the most significant effect on the red shift of the absorption spectra (up to 470 nm) is observed for Fe-TiO₂ coatings with Fe doping level up to 20 at. %. Fe-TiO₂ and Ni-TiO₂ coatings with doping levels of 15 at. % also have an extended absorption in the visible region (410÷420 nm). (paper)