Photostability of a C60 fullerene coating as a solid-phase photosensitizer of singlet oxygen
| Autor: | I. M. Belousova, T. K. Kris’ko, T. D. Murav'eva, I. V. Bagrov, Ivan M. Kislyakov, A. V. Ermakov, V. M. Kiselev |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Aqueous solution Fullerene Absorption spectroscopy Physics::Instrumentation and Detectors business.industry Singlet oxygen Physics::Medical Physics Photochemistry Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Optoelectronics Photosensitizer Irradiation Photodegradation business Methylene blue |
| Zdroj: | Optics and Spectroscopy. 105:720-725 |
| ISSN: | 1562-6911 0030-400X |
| Popis: | The stability of the optical properties and the generation efficiency of singlet oxygen of a solidphase photosensitizer based on fullerene in an aqueous suspension subjected to prolonged intense irradiation with visible light are studied in comparison with a photosensitizer based on methylene blue in an aqueous solution. Changes in the absorption spectra show that, as a result of 20-min irradiation, the content of fullerene decreases by 2% from its initial value, while that of methylene blue decreases by 19%. In both cases, the dynamics of the decrease in the photosensitizing ability of the photosensitizers in the course of their irradiation correlates with the changes in their spectra, but the magnitude of this decrease in the case of the solid-phase photosensitizer is greater than the magnitude of its spectral changes because of the surface nature of the photosensitization process. The study of the absorption spectra of fullerene coatings shows that their irradiation in water or in air causes the same photodegradation of fullerene. At the same time, studies with the help of the electron spin resonance (ESR) technique reveal differences in the nature of processes undergone by fullerene in water and in air. |
| Databáze: | OpenAIRE |
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