A sulfur-doped titanium dioxide thin film was prepared by pulsed laser deposition in the atmosphere controlled in carbon disulfide partial pressure. Optical and spectroscopic analyses demonstrated that the doped sulfur atom successfully triggered visible light sensitization by substituting with the lattice oxygen of titanium dioxide, which can absorb ultraviolet light only. As a result, photocatalytic hydrogen evolution activity of sulfur-doped titanium dioxide thin film was remarkably increased, compared with un-doped one. Moreover, an investigation on increase of the substrate temperature during laser ablation revealed that stabilization of sulfur atom in titanium dioxide was attained, resulting in high photocatalytic activity.
