Efficient raman enhancement and intermittent light emission observed in single gold nanocrystals

John T. Krug, Geoffrey D. Wang, Steven R. Emory, Shuming Nie

Research output: Contribution to journalArticle

Abstract

This paper reports two fundamental observations on the size-dependent optical properties of colloidal gold nanoparticles. First, faceted gold nanocrystals in the size range of 63 ± 3 nm have been found to be highly efficient for surface-enhanced Raman scattering (SERS). These nanocrystals are identified from a heterogeneous population for large optical enhancement at 647-nm laser excitation. Second, spatially isolated single gold particles emit Stokes-shifted Raman photons in an intermittent on-and-off fashion. In contrast to population-averaged studies, blinking surface-enhanced Raman scattering is a signature of single-particle (or even single-molecule) behavior. By directly measuring optical enhancement and time-resolved emission on single nanoparticles, this work opens new possibilities in studying the mechanisms of SERS, in developing metal tips for near-field optical microscopy, and in designing new nanostructured materials.

Original languageEnglish (US)
Pages (from-to)9208-9214
Number of pages7
JournalJournal of the American Chemical Society
Volume121
Issue number39
DOIs
StatePublished - Oct 6 1999
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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