Photocatalytic and superhydrophilicity properties of N-doped TiO2 nanothin films

► Optical band gap of N doped TiO2 was measured 0.18 eV less than the pure TiO2 thin film. ► The doping leads to a decrease in roughness of the samples from 4 nm (TiO2) to 1 nm (N-TiO2). ► N-TiO2 sample has more preferable hydrophilicity and photocatalytic properties rather than TiO2.