Abstract
Titanium dioxide doped with nitrogen (N-TiO2) was studied by electron paramagnetic resonance spectroscopy. Two types of paramagnetic centers were observed: N· and NO. The concentration of these centers depends significantly on temperature and irradiation with visible and UV light. It was established that the energy levels corresponding to the N· and NO centers are, respectively, 2.3 and 2.0 eV below the N-TiO2 conduction band. These centers are involved in the photooxidation of organic compounds on the N-TiO2 surface.
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