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Photoluminescence Quenching and Recovery of the CdSe Nanocrystals by Metal Ions
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 Title & Authors
Photoluminescence Quenching and Recovery of the CdSe Nanocrystals by Metal Ions
Bang, Jiwon; Kim, Bomi; Koo, Eunhae; Kim, Sungjee;
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Copper ion induced photoluminescence (PL) quenching dynamics and recovery of the PL by zinc ions were investigated for CdSe based nanocrystals. When copper ions were added, CdSe quantum dots showed fast and dramatically PL quenching whereas PL of CdSe nanorod gradually decreased. In the presence of zinc ions, the PL of CdSe/CdS (core/shell) nanocrystals that have quenched by copper ions was efficiently recovered. It showed that the PL intensity of nanocrystals increased by 50% in a solution containing 1 μM zinc ions. The PL intensity was increasing with increasing zinc ions, and could be described by Langmuir binding isotherm model. We showcase that the CdSe based nanocrystals can be used as fluorescence turn-on sensor.
Nanocrystal;Photoluminescence;Metal ion;Sensor;Coordinate;
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