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Investigation of the Generation of Singlet Oxygen in Ensembles of Photoexcited Silicon Nanocrystals by Electron Paramagnetic Resonance Spectroscopyстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Konstantinova E.A., Demin V.A., Timoshenko V.Yu
- Журнал: Journal of Experimental and Theoretical Physics
- Том: 107
- Номер: 3
- Год издания: 2008
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 473
- Последняя страница: 481
- DOI: 10.1134/S1063776108090148
- Аннотация: The generation of singlet oxygen is investigated and its concentration upon photoexcitation of silicon nanocrystals in porous silicon layers is determined using electron paramagnetic resonance spectroscopy. The relaxation times of spin centers, i.e., silicon dangling bonds, in vacuum and in an oxygen atmosphere in the dark and under illumination of the samples are measured for the first time. It is revealed that the spin-lattice relaxation in porous silicon is retarded as compared to that in a single-crystal substrate. From analyzing experimental data, a microscopic model is proposed for interaction of oxygen molecules in the triplet state and spin centers at the surface of silicon nanocrystals. The results obtained have demonstrated that porous silicon holds promise for the use as a photosensitizer of molecular oxygen in biomedical applications.
- Добавил в систему: Тимошенко Виктор Юрьевич