Investigation of the photoelectronic properties of nanocrystalline carbon- and nitrogen-doped titanium dioxide |
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Authors: | E A Konstantinova N T Le P K Kashkarov A A Zaytseva V G Kytin |
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Institution: | 1. Department of Physics, Moscow State University, Moscow, 119991, Russia
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Abstract: | This paper reports the results of the study of photoelectronic properties of nanocrystalline titanium dioxide doped with carbon and nitrogen. Photo-generated paramagnetic radicals were detected and identified in nanocrystalline titanium dioxide by the electron paramagnetic-resonance method. The concentrations of the radicals versus the carbon and oxygen content were determined in the dark and under light exposure. The presence of C and CO 2 ? -radicals in carbon-doped titanium dioxide and mainly N and NO radicals in nitrogen-doped titanium dioxide is shown. The concentration of the radicals increases under light exposure, which indicates the recharging processes of electronic states in the bandgap, due to the presence of a dopant, accompanied by generation of paramagnetic particles. The electron paramagnetic resonance data correlate with the kinetics of formaldehyde decomposition on the titanium dioxide samples under study. |
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