Titanium dioxide (TiO2) doped with sulfur (S) was synthesized by oxidation annealing of titanium disulfide (TiS2). According to the x-ray diffraction patterns, TiS2 turned into anatase TiO2 when annealed at 600°C. The residual S atoms occupied O-atom sites in TiO2 to form TiS bonds. The S doping caused the absorption edge of TiO2 to be shifted into the lower-energy region. Based on the theoretical analyses using ab initio band calculations, mixing of the S3p states with the valence band was found to contribute to the band gap narrowing.
|ジャーナル||Applied Physics Letters|
|出版ステータス||Published - 2002 7月 15|
ASJC Scopus subject areas