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Large-Area Nanogap Platforms for Surface-Enhanced Raman Spectroscopy Toward Sensing Applications: Comparison Between

Arunkumar Alagurasu1, Satyabrat Behera1, Joon-Mo Yang2

  • 1Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.

Biosensors
|June 25, 2025
PubMed
Summary

Silver nanogap structures significantly enhance surface-enhanced Raman spectroscopy (SERS) detection. This research highlights silver

Keywords:
Surface Enhanced Raman Spectroscopy (SERS)biomedical sensormolecule detectionnanogapsurface plasmon hotspot

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Area of Science:

  • Plasmonics and Nanophotonics
  • Spectroscopy
  • Materials Science

Background:

  • Sub-wavelength metallic nanostructures create plasmonic hotspots, enhancing light-matter interactions.
  • Plasmonic hotspots enable sensitive molecular detection via surface-enhanced Raman spectroscopy (SERS).
  • Nanogap structures offer large-area fabrication with uniform nanoscale gaps for SERS applications.

Purpose of the Study:

  • To fabricate large-area metal-insulator-metal nanogap structures using gold (Au) and silver (Ag).
  • To analyze the material dependence of SERS performance on these nanogap platforms.
  • To understand the underlying physics of enhanced electric fields in nanogaps for SERS.

Main Methods:

  • Fabrication of large-area metal-insulator-metal nanogap structures.
  • Characterization of SERS enhancement factors for Au and Ag nanogaps.
  • Electromagnetic field simulations to confirm enhanced electric fields in nanogaps.

Main Results:

  • Both Au and Ag nanogap structures demonstrated significant SERS enhancement.
  • Ag-based nanogaps exhibited 58- and 15-times greater enhancement factors for bottom and top hotspots, respectively, compared to Au.
  • Simulations confirmed that enhanced electric fields in the Ag nanogap are responsible for superior detection.

Conclusions:

  • Silver nanogap structures provide superior SERS performance compared to gold.
  • The enhanced electric field within the nanogap is crucial for high SERS sensitivity.
  • Findings offer insights for designing advanced nanoscale sensors for chemical and biomedical applications.