Title

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

Authors

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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