Synthesis and Single-Particle Surface-Enhanced Raman Scattering Study of Plasmonic Tripod Nanoframes with Y-Shaped Hot-Zones

Jeongwon Kim, Sungjae Yoo, Jae Myoung Kim, Sungwoo Choi, Juri Kim, So Jung Park, Doojae Park, Jwa Min Nam, Sungho Park

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Herein, plasmonic metal tripod nanoframes with three-fold symmetry were synthesized in a high yield (∼83%), and their electric field distribution and single-particle surface-enhanced Raman scattering (SERS) were studied. We realized such complex frame morphology by synthesizing analogous tripod nanoframes through multiple transformations. The precise control of the Au growth pattern led to uniform tripod nanoframes embedded with circle or line-shaped hot spots. The linear-shaped nanogaps ("Y"-shaped hot-zone) of the frame structures can strongly and efficiently confine the electric field, allowing for strong SERS signals. Coupled with a high synthetic yield of the targeted frame structure, strong and uniform SERS signals were obtained inside the nanoframe gaps. Remarkably, quite reproducible SERS signals were obtained with these structures - the SERS enhancement factors with an average value of 7.9 × 107 with a distribution of enhancement factors from 2.2 × 107 to 2.2 × 108 for 45 measured individual particles.

Original languageEnglish
Pages (from-to)4362-4369
Number of pages8
JournalNano Letters
Volume20
Issue number6
DOIs
StatePublished - 10 Jun 2020

Keywords

  • Hot-spot
  • Nanoframe
  • Nanogap
  • Single-particle SERS
  • Tripod

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