Photoinduced Dynamics of Spin Centers in Carbon-Modified Titanium Dioxide Nanotubesстатья
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Дата последнего поиска статьи во внешних источниках: 1 мая 2024 г.
Аннотация:Arrays of titanium dioxide (TiO2) nanotubes with different chemical compositions have been synthesized;their structural properties have been studied, and the characteristics of spin centers (defects) havebeen determined. All samples have appeared to contain carbon. It has been established that the main type ofspin centers in TiO2 nanotubes are dangling carbon bonds, and their concentration correlates with the carboncontent in the obtained structures. Under illumination, a reversible increase in the concentration of defectsoccurs, which is caused by their photoinduced recharging in the process of impurity absorption. This processis accompanied by an increase in the concentration of photoexcited electrons in the conduction band. Theoriginality and novelty of the work are determined by the development of a method for controlling the densityof defects and, accordingly, the concentration of photoinduced electrons by thermal treatment of samplesunder various conditions. The results open up new possibilities for the development of photocatalysts basedon titanium dioxide nanotubes with a controlled electron concentration in the conduction band that functionin the visible range of the spectrum.