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Reproducible SERRS from structured gold surfaces.

Sumeet Mahajan1, Jeremy J Baumberg, Andrea E Russell

  • 1School of Chemistry, University of Southampton, Southampton, UK.

Physical Chemistry Chemical Physics : PCCP
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Summary

This study demonstrates surface-enhanced resonance Raman scattering (SERRS) on electrodeposited gold films, achieving a 10^9 enhancement for detecting molecules. This technique offers highly sensitive and reproducible chemical analysis.

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Area of Science:

  • Nanomaterials
  • Spectroscopy
  • Surface Chemistry

Background:

  • Ordered metallic nanostructures are effective for surface-enhanced Raman scattering (SERS).
  • Electrodeposition offers reproducible fabrication of these nanostructures.
  • Surface-enhanced resonance Raman scattering (SERRS) significantly boosts detection sensitivity.

Purpose of the Study:

  • To demonstrate SERRS for the first time on electrodeposited gold films templated with colloidal spheres.
  • To assess the reproducibility of the SERRS response.
  • To directly compare SERRS with SERS using resonant and non-resonant dyes.

Main Methods:

  • Fabrication of gold films with ordered spherical cavities via electrodeposition.
  • Templating using colloidal spheres.
  • Utilizing surface-enhanced resonance Raman scattering (SERRS) and surface-enhanced Raman scattering (SERS).
  • Employing Cy5 and Cy3 dyes with different excitation maxima for comparison.

Main Results:

  • Demonstrated SERRS on electrodeposited gold films for the first time.
  • Achieved a resonant enhancement of approximately 10^3 over SERS.
  • Obtained net SERRS enhancements of the order of 10^9.
  • Confirmed reproducibility of the SERRS response.
  • Correlated the resonant enhancement profile with the surface plasmon resonance absorption spectrum.

Conclusions:

  • Electrodeposited gold films templated with colloidal spheres are effective for SERRS.
  • SERRS provides a significant enhancement (10^9) compared to SERS.
  • The technique is reproducible and shows promise for highly sensitive molecular detection.