Citation:
HAN Rong-Cheng, YU Min, SHA Yin-Lin. Interaction between CdSeS Quantum Dots and ld Nanoparticles in Solution[J]. Acta Physico-Chimica Sinica,
;2011, 27(01): 255-261.
doi:
10.3866/PKU.WHXB20110135
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We studied the interaction between CdSeS quantum dots (QDs) and ld nanoparticles (AuNPs) in solution. We found that the photoluminescence (PL) intensity of the QDs was efficiently quenched by the AuNPs with extraordinarily high Stern-Volmer quenching constant (Ksv) values that approach 108 L·mol-1. The quenching efficiency is strongly related to the spectral overlap and the distance between the QDs and AuNPs and is independent of solvent polaritym, ion strength, and pH value. These results suggest that this superquenching behavior can be attributed to a long-range (Förster-type) energy transfer. Our findings allow for the design of exquisite multiple örster resonance energy transfer (FRET)-based biosensors for the highly sensitive and simultaneous monitoring of multiple molecules in live cells.
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Keywords:
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Quantum dots
, - ld nanoparticles,
- Quenching,
- Energy transfer
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