Singlet Oxygen 1O2 in Photocatalysis on TiO2. Where Does It Come from?
| Autor: | Alexey V. Baklanov, Sergei A. Kochubei, Alexandra P. Pyryaeva, Alexander V. Demyanenko, Veniamin G. Goldort, Alexandr S. Bogomolov, Nikolay V. Dozmorov, Alexandra Svyatova |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Singlet oxygen Solvation 02 engineering and technology Electron 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound General Energy chemistry Photocatalysis Physical and Theoretical Chemistry 0210 nano-technology Phosphorescence Luminescence Excitation |
| Zdroj: | The Journal of Physical Chemistry C. 123:2175-2181 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.8b09381 |
| Popis: | Features of the near-infrared phosphorescence of singlet oxygen 1O2 photosensitized by TiO2 in solutions have been investigated. The short-lived phosphorescence of 1O2 with spectral maximum at approximately 1300 nm is observed to follow excitation by pulsed laser radiation at 355 nm of TiO2 suspended in CCl4 and water H2O. The shorter lifetime and spectral shift of this phosphorescence, as compared with phosphorescence of 1O2 sensitized by phenalenone in these solvents, are attributed to the adsorbed state of emitting singlet oxygen. The observed laser pulse energy dependence indicates the two-photon and three-photon nature of this phosphorescence initiation in CCl4 and H2O, respectively. The formation of 1O2 in CCl4 is assumed to be provided by the sequence of one-photon excitation of TiO2, giving rise to superoxide anion O2– and one-photon photodetachment of electron from O2–. The photodetachment of electron from O2– in water H2O is a two-photon process because of higher solvation energy of superoxide a... |
| Databáze: | OpenAIRE |
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