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Efficiency of porous silicon photosensitizer in the singlet oxygen-mediated oxidation of organic compounds

Paper ID Volume ID Publish Year Pages File Format Full-Text
27998 44055 2010 4 PDF Available
Title
Efficiency of porous silicon photosensitizer in the singlet oxygen-mediated oxidation of organic compounds
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 α-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.

Keywords
Singlet oxygen; Porous silicon; Photochemistry
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Efficiency of porous silicon photosensitizer in the singlet oxygen-mediated oxidation of organic compounds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 211, Issue 1, 5 March 2010, Pages 74–77
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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Price after discount Only $4.95
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