Carbon- and nitrogen-doped nanocrystalline titania specimens were studied by optical spectroscopy and electron paramagnetic resonance. The doping of this material was established to result in the appearance of additional absorption in the visible spectral region. The doping with admixture nitrogen was revealed to lead to the formation of nitrogen-containing paramagnetic sites, namely, N· and NO· radicals. The effect of the recharging of the detected sites under light was revealed. The obtained results could be useful for the development of photocatalytic filters on the basis of doped nanocrystalline titania.
76.30.Fc Iron group
$^1$Department of General Physics and Molecular Electronics, Faculty of Physics, Moscow State University, Moscow, 119991, Russia
$^2$Russian Research Center, Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182, Russia
$^3$Department of Inorganic Chemistry, Faculty of Chemistry, Moscow State University, Moscow, 119991, Russia
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