The Rise of Structurally Anisotropic Plasmonic Janus Gold Nanostars

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Prem Singh - , Indian Institute of Technology Mandi (Autor:in)
  • Koustav Kundu - , Indian Institute of Technology Mandi (Autor:in)
  • Sezer Seçkin - , Leibniz-Institut für Polymerforschung Dresden (Autor:in)
  • Keshav Bhardwaj - , Indian Institute of Technology Mandi (Autor:in)
  • Tobias A.F. König - , Leibniz-Institut für Polymerforschung Dresden, Technische Universität Dresden, Center for Advancing Electronics Dresden (cfaed) (Autor:in)
  • Amit Jaiswal - , Indian Institute of Technology Mandi (Autor:in)

Abstract

Nanostructures intrinsically possessing two different structural or functional features, often called Janus nanoparticles, are emerging as a potential material for sensing, catalysis, and biomedical applications. Herein, we report the synthesis of plasmonic gold Janus nanostars (NSs) possessing a smooth concave pentagonal morphology with sharp tips and edges on one side and, contrastingly, a crumbled morphology on the other. The methodology reported herein for their synthesis – a single-step growth reaction – is different from any other Janus nanoparticle preparation involving either template-assisted growth or a masking technique. Interestingly, the coexistence of lower- and higher-index facets was found in these Janus NSs. The general paradigm for synthesizing gold Janus NSs was investigated by understanding the kinetic control mechanism with the combinatorial effect of all the reagents responsible for the structure. The optical properties of the Janus NSs were realized by corelating their extinction spectra with the simulated data. The size-dependent surface-enhanced Raman scattering (SERS) activity of these Janus NSs was studied with 1,4-BDT as the model analyte. Finite-difference time-domain simulations for differently sized particles revealed the distribution of electromagnetic hot-spots over the particles resulting in enhancement of the SERS signal in a size-dependent manner.

Details

OriginalspracheEnglisch
Aufsatznummere202302100
FachzeitschriftChemistry - A European Journal
Jahrgang29
Ausgabenummer57
PublikationsstatusVeröffentlicht - 13 Okt. 2023
Peer-Review-StatusJa

Schlagworte

Schlagwörter

  • Janus nanoparticles, kinetic control, plasmonics, silver underpotential deposition, surface-enhanced Raman scattering