Quantum Efficiency Modification of Organic Fluorophores Using Gold Nanoparticles on DNA Origami Scaffolds

    Authors

    S. Pal; P. Dutta; H. N. Wang; Z. T. Deng; S. L. Zou; H. Yan;Y. Liu

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    NANOSTRUCTURES; IMMOBILIZATION; EMISSION; CAPSIDS; FRET; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    We used DNA origami as a platform to coassemble a 20 nm gold nanoparticle (AuNP) and an organic fluorophore (TAMRA) and studied the distance-dependent plasmonic interactions between the particle and the dye using steady state fluorescence and lifetime measurements. Greater fluorescence quenching was found at smaller dye-particle distances, which was accompanied by an enhancement of the decay rate. We also fabricated 20 and 30 tun AuNP homodimers using DNA origami scaffolds and positioned a Cy3 fluorophore between the AuNPs in both assemblies. For each particle size, three different interparticle distances were investigated. Up to 50% enhancement of the Cy3 fluorescence quantum efficiency was observed for the dye between the 30 nm AuNPs. These results are in good agreement with the theoretical simulations.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    117

    Issue/Number

    24

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    12735

    Last Page

    12744

    WOS Identifier

    WOS:000320911100037

    ISSN

    1932-7447

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