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Electrical and electronic engineering
The photoluminescence response of semiconductor CdSe/ZnS quantum dots embedded in a borosilicate porous glass matrix to exposure to ammonia vapor is investigated. Formation of surface complexes on the quantum dots results in quenching of the photoluminescence and a shortening of the luminescence decay time. The process is reversible, desorption of ammonia molecules from the quantum dot surface causes the photoluminescence to recover. The sensitivity of the quantum dot luminescence intensity and decay time to the interaction time and the reversibility of the photoluminescence changes makes the CdSe/ZnS quantum dot in porous glass system a candidate for use as an optical sensor of ammonia. Keywords: Quantum dots, ammonia, porous glass, photoluminescence
Orlova, A. O. et al. (2013) Reversible Photoluminescence Quenchin of CdSe/ZnS Quantum Dots Embedded in Porous Glass by Ammonia Vapor. Nanotechnology. 2013 Aug 23;24(33):335701 doi:10.1088/0957-4484/24/33/335701
RFBR (Grants 12-02-01263 and 12-02-00938) and the Ministry of Education and Science of the Russian Federation (Projects 11.519.11.3020, 11.519.11.3026, № 14.B37.21.0741 and 14.В37.21.1954).