Fluorescence quenching of quantum dots by gold nanoparticles: A potential long range spectroscopic ruler

Anirban Samanta, Yadong Zhou, Shengli Zou, Hao Yan, Yan Liu

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

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 ∼28 nm. This long-range quenching phenomena may be useful for developing extended spectroscopic rulers in the future.

Original languageEnglish (US)
Pages (from-to)5052-5057
Number of pages6
JournalNano Letters
Volume14
Issue number9
DOIs
StatePublished - Sep 10 2014

Keywords

  • DNA
  • FRET
  • NSET
  • Quantum dots
  • gold nanoparticles
  • self-assembly

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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