The Effect of Spin Center Parameters on the Photoactivity of Nanocrystalline Titanium Dioxide in the Visible Spectral Range
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2020-01-01 |
| Journal | Crystallography Reports |
| Authors | Е. А. Константинова, В. Б. Зайцев, А. А. Миннеханов, N. T. Le, П. К. Кашкаров |
| Institutions | Lomonosov Moscow State University, Kurchatov Institute |
| Citations | 2 |
Abstract
Section titled “Abstract”Nanocrystalline TiO2 samples, obtained by sol-gel and supercritical fluid (SCF) methods, have been studied by optical spectroscopy and electron spin resonance. It is established that the main type of spin centers in SCF samples are Ti3+/oxygen vacancy centers and conduction electrons. Radicals ($${{{\text{N}}}^{ \bullet }}$$, $${\text{N}}{\kern 1pt} {\text{O}}{{{\kern 1pt} }^{ \bullet }}$$) and ($${{{\text{C}}}^{ \bullet }}$$) are found in the samples doped with nitrogen and carbon, respectively. The energy levels of defects in the band gap of the structures studied are determined. It is explained why samples with close values of nanocrystal sizes, specific surface area, and defect concentration have a significantly different photocatalytic activity in the visible spectral range. It is found that impurity centers with energy levels near the middle of the semiconductor band gap must be incorporated into TiO2 to obtain samples with the highest photocatalysis rate. New possibilities for developing energy-efficient (without UV irradiation) photocatalysts are discovered.
Tech Support
Section titled “Tech Support”Original Source
Section titled “Original Source”References
Section titled “References”- 1989 - Photocatalysis: Fundamentals and Applications