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Coupling Single-Drop Microextraction with SERS: A Demonstration Using p-MBA on Gold Nanohole Array Substrate.

Elias B Santos1, Chiara Valsecchi2, Jaderson L S Gonçalves3

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Summary

This study combines single-drop microextraction (SDME) with surface-enhanced Raman scattering (SERS) for sensitive detection. The coupled technique efficiently pre-concentrates and detects analytes at low concentrations, enhancing analytical capabilities.

Keywords:
Raman signaturegold nanohole arrayinterference lithographylow concentration detectionpre-concentration

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Area of Science:

  • Analytical Chemistry
  • Nanotechnology
  • Spectroscopy

Background:

  • Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.
  • Low analyte concentrations pose challenges for direct SERS analysis.
  • Sample pre-concentration techniques are crucial for improving detection limits.

Purpose of the Study:

  • To couple single-drop microextraction (SDME) with SERS for enhanced analyte detection.
  • To develop a rapid and efficient method for pre-concentration and quantification.
  • To evaluate the performance of a gold nanohole array substrate (AuNHAS) for SERS.

Main Methods:

  • Fabrication of AuNHAS using interference lithography.
  • Utilizing para-mercaptobenzoic acid (p-MBA) as a probe molecule.
  • Coupling SDME with SERS for sample extraction and pre-concentration.

Main Results:

  • Direct SERS detected p-MBA at 10-7 mol L-1.
  • SDME-SERS enabled detection of p-MBA at 10-8 mol L-1.
  • Achieved a pre-concentration factor from 10-8 mol L-1 to ~4.6 × 10-5 mol L-1 in 5 minutes.

Conclusions:

  • The combined SDME-SERS approach provides rapid and efficient pre-concentration and detection.
  • This method significantly enhances sensitivity for low-concentration analytes.
  • The developed technique is a valuable analytical tool for SERS applications.