We investigated the photoanodic polarization behavior of TiO
2 films formed on TiN and Ti
2N by high-temperature oxidation under pressures from 1.01×10
1 to 1.01×10
5 Pa O
2 in a Na
2SO
4 solution. TiO
2 films formed on TiN and Ti
2N and a TiO
2 film formed on metallic titanium were rutile with no nitrogen detected. Photo-anodic currents of TiO
2 films on TiN, Ti
2N, and metallic titanium increased, in that order. The current of the TiO
2 on TiN film was especially large. However, the energy bandgaps of the TiO
2 films were not substrate-dependent. The reason for the large current of the TiO
2 on TiN film is considered from the result of nonstoichiometric composition of the TiO
2 film surface that developed during the TiO
2 film growth process.
抄録全体を表示