Fluorescence Quenching of Quantum Dots by Gold Nanoparticles: A Potential Long Range Spectroscopic Ruler

    Authors

    A. Samanta; Y. D. Zhou; S. L. Zou; H. Yan;Y. Liu

    Comments

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    Abbreviated Journal Title

    Nano Lett.

    Keywords

    Quantum dots; gold nanoparticles; FRET; NSET; DNA; self-assembly; RESONANCE ENERGY-TRANSFER; DNA-ORIGAMI; SPECTRAL OVERLAP; NANOSTRUCTURES; ENHANCEMENT; DISCRETE; MOLECULE; ARRAYS; METAL; DECAY; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter

    Abstract

    The dependence of quantum dot (QD) fluorescence emission on the proximity of 30 nm gold nanoparticles (AuNPs) was studied with controlled interparticle distances ranging from 15 to 70 nm. This was achieved by coassembling DNA-conjugated QDs and AuNPs in a 1:1 ratio at precise positions on a triangular-shaped DNA origami platform. A profound, long-range quenching of the photoluminescence intensity of the QDs was observed. A combination of static and time-resolved fluorescence measurements suggests that the quenching is due to an increase in the nonradiative decay rate of QD emission. Unlike FRET, the energy transfer is inversely proportional to the 2.7th power of the distance between nanoparticles with half quenching at similar to 28 nm. This long-range quenching phenomena may be useful for developing extended spectroscopic rulers in the future.

    Journal Title

    Nano Letters

    Volume

    14

    Issue/Number

    9

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    5052

    Last Page

    5057

    WOS Identifier

    WOS:000341544500020

    ISSN

    1530-6984

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