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Gold nanoparticles decorated 2D-WSe2 as a SERS substrate.

Dipanwita Majumdar1, Subhajit Jana2, Samit Kumar Ray3

  • 1Satyendra Nath Bose National Centre for Basic Sciences, Block - JD, Sector - III, Salt Lake, Kolkata 700106, India.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 13, 2022
PubMed
Summary

A new gold nanoparticle/tungsten diselenide (Au NPs/WSe2) nanohybrid SERS substrate shows high sensitivity for detecting Rhodamine 6G. This advanced material significantly outperforms bare WSe2, offering improved sensing capabilities.

Keywords:
Detection abilityGold nanoparticlesNanohybrid structureRhodamine 6GSERSWSe(2)

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Developing advanced Surface-Enhanced Raman Scattering (SERS)-active substrates is crucial for next-generation sensing and analysis.
  • Two-dimensional (2D) materials like tungsten diselenide (WSe2) offer unique properties for SERS applications.

Purpose of the Study:

  • To engineer a novel nanohybrid SERS platform by combining 0D plasmonic gold nanoparticles (Au NPs) with 2D WSe2 flakes.
  • To evaluate the SERS performance of the Au NPs/WSe2 nanohybrid structure for sensitive molecule detection.

Main Methods:

  • Fabrication of a nanohybrid SERS substrate via decoration of WSe2 flakes with Au NPs.
  • Morphological characterization to optimize nanoparticle distribution on the WSe2 surface.
  • Concentration-dependent SERS measurements using Rhodamine 6G (R6G) as a target analyte.

Main Results:

  • Optimal conditions yielded densely populated Au NPs on the WSe2 surface.
  • The Au NPs/WSe2 hybrid substrate demonstrated significant SERS activity, achieving a detection limit of 1 x 10^-9 M for R6G.
  • This detection limit is several orders of magnitude lower than that of bare WSe2 (10^-3 M).
  • The substrate exhibited reliable signal stability and reproducibility.

Conclusions:

  • The developed Au NPs/WSe2 nanohybrid structure serves as an efficient SERS substrate.
  • The nanohybrid material shows great potential for highly sensitive and reliable SERS applications.
  • This work highlights the synergistic effects of combining plasmonic nanoparticles with 2D materials for enhanced sensing.