Probing localized surface plasmons of trisoctahedral gold nanocrystals for surface enhanced raman scattering

Achyut Maity, Arpan Maiti, Biswarup Satpati, Avinash Patsha, Sandip Dhara, Tapas Kumar Chini

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Trisoctahedral (TOH) shaped gold (Au) nano-crystals (NCs) have emerged as a new class of metal nanoparticles (MNPs) due to their superior catalytic and surface enhanced Raman scattering (SERS) activities caused by the presence of high density of atomic steps and dangling bonds on their high-index facets. We examine the radiative localized surface plasmon resonance (LSPR) modes of an isolated single TOH Au NC using cathodoluminescence (CL), with high resolution spatial information on the local density of optical states (LDOS) across the visible spectral range. Further, we show pronounced enhancement in the Raman scattering by performing Raman spectroscopic measurements on Rhodamine 6G (R6G)-covered TOH Au NPs aggregates on a Si substrate. We believe that the hot spots between two adjacent MNP surfaces ("nanogaps") can be significantly stronger than single particle LSPRs. Such "nanogaps" hot spots may have crucial role on the substantial SERS enhancement observed in this report. Consequently, the present study indicates that MNPs aggregates are highly desirable than individual plasmonic nanoparticles for possible applications in SERS based biosensing.

Original languageEnglish
Pages (from-to)27003-27012
Number of pages10
JournalJournal of Physical Chemistry C
Volume120
Issue number47
DOIs
StatePublished - 1 Dec 2016
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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