aIoffe Institute, St. Petersburg, Russian Federation bDepartment of Chemical Science and Technology, Hosei University, Tokyo, Japan cCeramic Research Center, Saga University, Arita, Saga, Japan dResearch Center for Micro-Nano Technology, Hosei University, Koganei, Tokyo, Japan eResearch Center for Functional Materials, National Institute for Material Science, Tsukuba, Ibaraki, Japan
Аннотация:
Light-induced electron paramagnetic resonance (EPR) spectra of titanium dioxide nanoparticles heavily doped with niobium(v) are studied. At low temperatures, the EPR signal caused by interband illumination is associated with paramagnetic Ti3+ sites in anatase, which, as the temperature rises above 210 K, are discharged to the non-paramagnetic Ti4+ state due to the escape of trapped photoelectrons and their recombination with holes. The temperature dependence of the integral EPR signal has a non-Curie character, especially in the temperature range where the discharge of Ti3+ centers is already significant.
Ключевые слова:
titanium dioxide, niobium, photocatalysts, electron paramagnetic resonance, electron and hole traps, charge transfer.
Полный текст:
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