Photophysical properties of organic fluorescent probes on nanosized TIO 2 /SIO 2 systems prepared by the sol–gel method
| Autor: | L Spanhel, O. Linnik, O. Rusina, N. P. Smirnova, K. Rechthaler, Anna Eremenko, T.B Eremenko |
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| Rok vydání: | 2000 |
| Předmět: |
Photoluminescence
business.industry Organic Chemistry technology industry and agriculture Oxide chemistry.chemical_element Photochemistry Fluorescence Analytical Chemistry Inorganic Chemistry chemistry.chemical_compound Adsorption Semiconductor chemistry Molecule business Spectroscopy Sol-gel Titanium |
| Zdroj: | Journal of Molecular Structure. 553:1-7 |
| ISSN: | 0022-2860 |
| Popis: | Highly transparent TiO 2 and TiO 2 /SiO 2 films prepared using the sol–gel technique have been studied by means of fluorescence probes method. Electronic interactions between adsorbed species—pyrene and donor–acceptor substituted push–pull stilbene—and Ti-doped silica matrices have been studied by the methods of steady-state and momentary spectrofluorimetry. Organic molecules are strongly adsorbed on the TiO 2 and Ti/Si surfaces. Increasing the Ti content within Ti/Si systems results in a decrease in the intensity of the photoluminescence spectra. These findings indicate that titania oxide species are highly dispersed within silica matrices, probably without aggregating each other, and adsorbed molecules are in direct contact with titanium ions located on the Ti/Si surface. The time scale of these decay processes is tens of nanoseconds. The fluorescence emission quenching can be attributed to the charge injection from the singlet excited state of the molecule to the conduction band of the semiconductor. |
| Databáze: | OpenAIRE |
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