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    Dynamic and Static Quenching of Fluorescence by 1-4 nm Diameter Gold Monolayer-Protected Clusters

    Access Status
    Fulltext not available
    Authors
    Cheng, P.
    Silvester, Debbie
    Wang, G.
    Kalyuzhny, G.
    Douglas, A.
    Murray, R.
    Date
    2006
    Type
    Journal Article
    
    Metadata
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    Citation
    Cheng, P. and Silvester, D. and Wang, G. and Kalyuzhny, G. and Douglas, A. and Murray, R. 2006. Dynamic and Static Quenching of Fluorescence by 1-4 nm Diameter Gold Monolayer-Protected Clusters. Journal of Physical Chemistry B. 110: pp. 4637-4644.
    Source Title
    Journal of Physical Chemistry B
    DOI
    10.1021/jp057028n
    ISSN
    10895647
    URI
    http://hdl.handle.net/20.500.11937/35740
    Collection
    • Curtin Research Publications
    Abstract

    How the efficiency of molecular quenching by Au nanoparticles depends on nanoparticle size is reported for (a) dynamic (collisional) quenching of four different fluorophores by three Au nanoparticles having similar protective layers but differing core diameters (1.1, 1.6, and 2.0 nm) and (b) static quenching in the electrostatic association between [Ru(bpy)3]2+ and five tiopronin-protected Au nanoparticles having core diameters from 1.3 to 3.9 nm. The quenching constants systematically increase with core size. In (a), the dynamic constants scale with the molar absorbance coefficients of the nanoparticles, showing the essentially of the absorbance/ emission spectral overlap, and the associated nanoparticle core density of electronic states, in energy-transfer quenching. In (b), the fluorescence of the Au nanoparticle itself was enhanced by energy transfer from the [Ru(bpy)3]2+ fluorophore.

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