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Dynamics of photosensitized formation of singlet oxygen by porous silicon in aqueous solution
- Source :
- Journal of Applied Physics. 100:124302
- Publication Year :
- 2006
- Publisher :
- AIP Publishing, 2006.
-
Abstract
- Generation of singlet oxygen due to energy transfer from photoexcited silicon nanocrystals in D2O is demonstrated. It is shown that the singlet oxygen generation efficiency, i.e., the intensity of near-infrared emission from singlet oxygen gradually decreases when Si nanocrystals are continuously irradiated in O2-saturated D2O. The mechanism of the photodegradation of the photosensitizing efficiency is studied using photoluminescence and infrared absorption techniques. Experimental results suggest that the interaction of photogenerated singlet oxygen with the hydrogen-terminated surface of silicon nanocrystals results in photo-oxidation of silicon nanocrystals, and the surface oxides reduce the photosensitizing efficiency. It is also demonstrated that photo-oxidation of porous silicon in O2-saturated water results in a strong enhancement of the photoluminescence quantum yield of porous Si.
- Subjects :
- inorganic chemicals
Photoluminescence
Materials science
Silicon
Physics::Instrumentation and Detectors
Singlet oxygen
technology, industry, and agriculture
General Physics and Astronomy
Quantum yield
chemistry.chemical_element
Infrared spectroscopy
equipment and supplies
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Photochemistry
Porous silicon
Oxygen
Condensed Matter::Materials Science
chemistry.chemical_compound
chemistry
Physics::Chemical Physics
Photodegradation
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 100
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........6483b450d19b4aba38eb444d5f41a9e1