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Atomically Precise Nanoclusters as SERS Probes.

Sujan Manna1, Anant O Bhasin2, Vivek Yadav1

  • 1DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.

Nano Letters
|March 13, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel nanohybrid using silver nanoclusters (Ag17) and gold nanotriangles (Au NTs) for enhanced Raman spectroscopy. This Ag17@Au NT nanohybrid acts as a sensitive Raman probe, overcoming luminescence interference.

Keywords:
anisotropic nanoparticleschemical enhancementnanoclustersnanohybridsurface-enhanced Raman spectroscopy

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Area of Science:

  • Nanomaterials Science
  • Spectroscopy
  • Computational Chemistry

Background:

  • Atomically precise nanoclusters (NCs) possess molecule-like properties but suffer from weak Raman signals obscured by luminescence.
  • Developing sensitive probes for NC characterization is crucial for understanding their unique behaviors.

Purpose of the Study:

  • To utilize surface-enhanced Raman spectroscopy (SERS) to investigate the molecular characteristics of a stable eight-electron silver NC, [Ag17(o1-carboranethiolate)12]3- (Ag17).
  • To create a robust nanohybrid system for advanced Raman probing under demanding experimental conditions.

Main Methods:

  • Integration of Ag17 NCs with plasmonic gold nanotriangles (Au NTs) to form Ag17@Au NT nanohybrids.
  • Application of SERS to detect and analyze the Raman signals of the nanohybrid.
  • Time-dependent density functional theory (TDDFT) calculations to elucidate enhancement mechanisms and spectral features.

Main Results:

  • The Ag17@Au NT nanohybrid demonstrated stable and sensitive Raman probing capabilities, even under harsh laser irradiation.
  • An overall enhancement factor of up to ~6 × 105 was achieved, with chemical enhancement contributing ~2 × 102.
  • TDDFT calculations successfully reproduced experimental spectra and identified low-lying hybrid charge-transfer excited states responsible for chemical enhancement.

Conclusions:

  • The Ag17@Au NT nanohybrid represents a significant advancement in using atomically precise NCs as next-generation Raman probes.
  • Synergistic electromagnetic and chemical enhancement mechanisms, driven by plasmonic confinement and charge transfer, significantly amplify Raman scattering.
  • This work provides a powerful platform for probing the molecular nature of NCs and related nanoscale materials.