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Efficiency of porous silicon photosensitizer in the singlet oxygen-mediated oxidation of organic compounds
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Loponov, Konstantin, Goller, Bernhard, Moskalenko, Andriy, Kovalev, Dmitry and Lapkin, Alexei (2010) Efficiency of porous silicon photosensitizer in the singlet oxygen-mediated oxidation of organic compounds. Journal of Photochemistry and Photobiology A: Chemistry, Vol.211 (No.1). pp. 74-77. doi:10.1016/j.jphotochem.2010.02.005 ISSN 1010-6030.
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Official URL: http://dx.doi.org/10.1016/j.jphotochem.2010.02.005
Abstract
The efficiency of singlet oxygen photosensitization by porous silicon is compared with that of a conventional dye photosensitizer tetraphenylporphine by means of singlet oxygen-mediated photooxidation of a-terpinene. Based on photoluminescence measurements it was concluded that the efficiency of porous silicon as a sensitizer is much lower than that of the conventional organic dye. The main reasons for this are the low quantum yield of long living photoinduced electronic excitations (excitones) confined in silicon nanocrystals and deactivation of singlet oxygen by H-terminated internal surface of porous silicon powder. Efficient quenching of excitons in porous silicon by 1,3-diphenylisobenzofuran via the direct energy transfer was demonstrated. This process is believed to be responsible for photobleaching of
1,3-diphenylisobenzofuran at its millimolar concentrations. (C) 2010 Elsevier B.V. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Active oxygen, Porous silicon, Photochemistry | ||||
Journal or Publication Title: | Journal of Photochemistry and Photobiology A: Chemistry | ||||
Publisher: | Elsevier Science SA | ||||
ISSN: | 1010-6030 | ||||
Official Date: | 5 March 2010 | ||||
Dates: |
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Volume: | Vol.211 | ||||
Number: | No.1 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 74-77 | ||||
DOI: | 10.1016/j.jphotochem.2010.02.005 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), United States. Army, Vesta Ceramics | ||||
Grant number: | EP/E012183/1 (EPSRC), W911NF0820011 (US Army) |
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