Origin of size-dependent energy transfer from photoexcited CdSe quantum dots to gold nanoparticles

Mariana Kondon, Junhyung Kim, Nayane Udawatte, Dongil Lee

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The photoluminescence quenching of a CdSe quantum dot by hexanethiolate-monolayer-protected gold clusters (MPCs) with core diameters of 1.1 -4.9 nm is described. Experimental evidence suggests that the quenching occurs via an energy transfer mechanism. The energy transfer quenching efficiencies of MPCs were compared using Stern-Volmer plots. The quenching constant (KQ) obtained from the slope of the plot shows an enormous increase from 2.5 × 108 to 2.3 × 108 M-1 by nearly 1000-fold as the core size increases from 1.1 to 4.9 nm. The origin of the size dependence is considered. There is a remarkable linear correlation found between the quenching constant and the MPC core volume. This correlation suggests that the energy transfer quenching efficiency is governed by the absorption cross-section of the MPC quencher that scales as its core volume.

Original languageEnglish
Pages (from-to)6695-6699
Number of pages5
JournalJournal of Physical Chemistry C
Volume112
Issue number17
DOIs
Publication statusPublished - 2008 May 1

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this