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Revisiting Surface-Enhanced Raman Scattering on Realistic Lithographic Gold Nanostripes.

I Sow1, J Grand, G Lévi

  • 1Interfaces, Traitements, Organisation et Dynamique des Systèmes, Université Paris Diderot, Sorbonne Paris Cité, CNRS UMR 7086 , 15 rue Jean de Baïf, 75013 Paris, France.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|December 17, 2013
PubMed
Summary
This summary is machine-generated.

Nanoscale surface roughness on gold nanostripes significantly boosts Surface-Enhanced Raman Scattering (SERS) for methylene blue molecules. This effect enhances Raman signals even away from plasmon resonance, crucial for molecular sensing applications.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Surface Science and Spectroscopy
  • Materials Science

Background:

  • Surface-Enhanced Raman Scattering (SERS) is a powerful technique for sensitive molecular detection.
  • Gold nanostructures are widely explored for SERS due to their tunable optical properties.
  • The role of nanoscale surface roughness (NSR) in SERS efficiency is not fully understood.

Purpose of the Study:

  • To investigate the impact of nanoscale surface roughness (NSR) and crystallinity on the SERS efficiency of methylene blue (MB) on gold nanostripes.
  • To correlate structural properties of gold nanostructures with their SERS performance.
  • To validate experimental findings with numerical simulations.

Main Methods:

  • Fabrication of gold nanostripes with varying degrees of crystallinity and NSR using electron beam lithography and thermal evaporation.
  • Deposition of methylene blue (MB) probe molecules onto the gold nanostructures.
  • SERS measurements and analysis of MB signal intensity.
  • Numerical calculations using the discrete dipole approximation (DDA) to model SERS gain.

Main Results:

  • Nanoscale surface roughness (NSR) significantly enhances the SERS intensity of methylene blue (MB) molecules.
  • Higher NSR leads to a stronger Raman signal, independent of the degree of crystallinity.
  • Enhanced SERS signals were observed even when the excitation wavelength was far from the localized surface plasmon resonance (LSPR).

Conclusions:

  • Nanoscale surface roughness is a critical factor in maximizing SERS efficiency on gold nanostructures.
  • The optical near-field enhancement driven by NSR plays a crucial role in molecular sensing applications.
  • Fabrication methods controlling NSR are vital for optimizing SERS-based nano-optical devices.