Title

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

Authors

Authors

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

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

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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