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  • Photoluminescence enhancement of carbon dots by gold nanoparticles conjugated via PAMAM dendrimers

    Author(s)
    Zong, Jie
    Yang, Xiaoling
    Trinchi, Adrian
    Hardin, Simon
    Cole, Ivan
    Zhu, Yihua
    Li, Chunzhong
    Muster, Tim
    Wei, Gang
    Griffith University Author(s)
    Cole, Ivan
    Year published
    2013
    Metadata
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    Abstract
    Carbon dots (CDs) have many fascinating fluorescent properties, however, their low quantum yield limits their applications. In this study, the photoluminescence (PL) of CDs in the vicinity of gold nanoparticles (Au NPs) is enhanced significantly due to the surface plasmon resonance (SPR) of the Au NPs. This is achieved by conjugating Au NPs and CDs to dendrimers (PAMAM) through an amidation reaction, resulting in the formation of the Au–PAMAM–CD conjugates. The maximum 62-fold enhancement was obtained with an optimized molar ratio between Au NPs, PAMAM, and CDs. In this process, PAMAM, which serves as a spacer, can keep Au ...
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    Carbon dots (CDs) have many fascinating fluorescent properties, however, their low quantum yield limits their applications. In this study, the photoluminescence (PL) of CDs in the vicinity of gold nanoparticles (Au NPs) is enhanced significantly due to the surface plasmon resonance (SPR) of the Au NPs. This is achieved by conjugating Au NPs and CDs to dendrimers (PAMAM) through an amidation reaction, resulting in the formation of the Au–PAMAM–CD conjugates. The maximum 62-fold enhancement was obtained with an optimized molar ratio between Au NPs, PAMAM, and CDs. In this process, PAMAM, which serves as a spacer, can keep Au NPs and CDs at an appropriate distance for PL enhancement. The adjustment of the amount of Au NPs or CDs linked to PAMAM can induce the optimum PL enhancement. This strategy can be easily applied to different metal–space–fluorophore systems to enhance the fluorescence of fluorophores.
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    Journal Title
    Nanoscale
    Volume
    5
    Issue
    22
    DOI
    https://doi.org/10.1039/c3nr02527f
    Subject
    Physical sciences
    Chemical sciences
    Nanotechnology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/173762
    Collection
    • Journal articles

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