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Quenching of Fluorescence from CdSe/ZnS Nanocrystal QDs Near Copper Nanoparticles in Aqueous Solution

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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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Acknowledgments

This material is based upon work supported by the National Science Foundation under grant no. CMS-409401.

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Author notes

  1. Sanchari Chowdhury

    Present address: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA-15213, USA

Authors and Affiliations

  1. Department of Chemical & Biomedical Engineering, University of South Florida, Tampa, FL, 33620-5350, USA

    Sanchari Chowdhury & Venkat R. Bhethanabotla

  2. Department of Civil & Environmental Engineering, University of South Florida, Tampa, FL, 33620-5350, USA

    Rajan Sen

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  1. Sanchari Chowdhury
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  2. Venkat R. Bhethanabotla
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  3. Rajan Sen
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Correspondence to Venkat R. Bhethanabotla.

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Chowdhury, S., Bhethanabotla, V.R. & Sen, R. Quenching of Fluorescence from CdSe/ZnS Nanocrystal QDs Near Copper Nanoparticles in Aqueous Solution. Plasmonics 6, 735–740 (2011). https://doi.org/10.1007/s11468-011-9257-9

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  • DOI: https://doi.org/10.1007/s11468-011-9257-9

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