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Ratiometric Sensing of Polycyclic Aromatic Hydrocarbons Using Capturing Ligand Functionalized Mesoporous Au

Dongjie Zhang1, Rui Hao1, Lingling Zhang1

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This study introduces a ratiometric surface-enhanced Raman scattering (SERS) method for detecting polycyclic aromatic hydrocarbons (PAHs). Functionalized gold nanoparticles and a hydrophobic surface enable sensitive detection of PAHs like anthracene.

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Effective surface-enhanced Raman scattering (SERS) detection relies on analyte-plasmonic nanostructure interactions.
  • Detecting analytes with low surface affinity, such as polycyclic aromatic hydrocarbons (PAHs), remains challenging for SERS.

Purpose of the Study:

  • To develop a ratiometric SERS strategy for sensitive PAH detection.
  • To enhance analyte absorption on plasmonic nanostructures using surface functionalization.

Main Methods:

  • Surface functionalization of 3D ordered mesoporous gold nanoparticles (meso-Au NPs) with mono-6-thio-β-cyclodextrin (HS-β-CD).
  • Utilizing a hydrophobic slippery surface as a concentrator for analyte enrichment.
  • Employing host-guest interactions for effective absorption of hydrophobic PAHs.

Main Results:

  • Achieved low detection limits for anthracene (1 ppb) and naphthalene (10 ppb).
  • Demonstrated ratiometric determination of anthracene from 1 ppm to 1 ppb using HS-β-CD as an internal standard.
  • Attributed improved SERS enhancement to host-guest effects, mesoporous structure, and analyte enrichment.

Conclusions:

  • The developed surface modification strategy enhances capture and trace detection of PAHs.
  • The combination of functionalized nanoparticles and a hydrophobic surface shows significant potential for SERS applications in detecting persistent organic pollutants.