Quenching of Fluorescence from CdSe/ZnS Nanocrystal QDs Near Copper Nanoparticles in Aqueous Solution |
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Authors: | Sanchari Chowdhury Venkat R Bhethanabotla Rajan Sen |
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Institution: | (1) Department of Chemical & Biomedical Engineering, University of South Florida, Tampa, FL 33620-5350, USA;(2) Department of Civil & Environmental Engineering, University of South Florida, Tampa, FL 33620-5350, USA;(3) Present address: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA-15213, USA; |
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Abstract: | Significant quenching of fluorescence from CdSe/ZnS nanocrystal quantum dots (QDs) coated with mercaptoundecanoic ligands
has been realized by copper nanoparticles (NPs). (a) Static quenching in the electrostatic association between the CdSe/ZnS
QDs and cetyltrimethylammonium bromide-coated Cu NPs and (b) dynamic quenching of the same nanocrystals by polyvinylpyrrolidone-coated
Cu NPs were studied. In both cases, the quenching of fluorescence from the CdSe/ZnS nanocrystals is sensitive to nanomolar
concentrations of the copper NPs, and the quenching efficiency increases as spectral overlap between the CdSe/ZnS emission
and the copper nanoparticle absorption increases. This suggests that the observed quenching is a result of energy transfer
processes. These findings open new avenues for the utilization of Cu NPs in energy transfer-based applications. |
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