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Tunable SERS Enhancement via Sub-nanometer Gap Metasurfaces.

Stephen J Bauman1, Ahmad A Darweesh1, Miles Furr2

  • 1Microelectronics-Photonics Graduate Program, University of Arkansas, Fayetteville, Arkansas 72701, United States.

ACS Applied Materials & Interfaces
|March 28, 2022
PubMed
Summary
This summary is machine-generated.

This study demonstrates surface-enhanced Raman spectroscopy (SERS) using gold nanosphere metasurfaces with precise subnanometer gaps. Results show signal enhancement decreases below 1 nm, offering insights into nanoscale plasmonic effects for sensor development.

Keywords:
Raman sensingSERSmetasurfacenano-opticsplasmonicssubnanometer

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Spectroscopy

Background:

  • Raman sensing detects chemical signatures.
  • Plasmonic nanostructures enhance Raman signals (SERS).
  • Precise control of nanostructure features is crucial for SERS optimization.

Purpose of the Study:

  • To demonstrate SERS using gold nanosphere metasurfaces with tunable subnanometer gap widths.
  • To investigate the effect of subnanometer gap widths on SERS signal enhancement.
  • To explore the potential of these metasurfaces for probing nanoscale interfacial effects.

Main Methods:

  • Fabrication of gold nanosphere metasurfaces with controlled subnanometer intersphere gaps (within 1 nm).
  • Measurement of analyte Raman spectra on these metasurfaces across various gap widths.
  • Electromagnetic field modeling to corroborate experimental observations.

Main Results:

  • Surface-affected signal enhancement increased with decreasing gap width.
  • An enhancement quenching effect was observed for gaps below approximately 1 nm.
  • Experimental data aligned with electromagnetic field modeling predictions.

Conclusions:

  • Tunable subnanometer gap metasurfaces are effective for SERS.
  • The study provides insights into gap-width-dependent SERS in the subnanometer regime.
  • These metasurfaces could be valuable tools for studying nonlocal and quantum effects, aiding sensor development.