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A gold nanoparticle doped flexible substrate for microplastics SERS detection.

Dewen Xu1,2, Wei Su1,2, Hanwen Lu1,2

  • 1College of Science, Hohai University, Changzhou, 213022, China. opticsu@hhu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|May 10, 2022
PubMed
Summary

A new method uses gold nanoparticle-doped filter paper for simple, sensitive detection of microplastics (MPs) in water. This surface-enhanced Raman scattering (SERS) approach offers a practical solution for on-site environmental monitoring.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Microplastic (MP) pollution in aquatic ecosystems poses risks to human health via the food chain.
  • Conventional MP detection methods are complex and require extensive sample preparation.
  • There is a critical need for simple, on-site MP detection techniques.

Purpose of the Study:

  • To develop a simple, sensitive, accurate, and stable method for detecting microplastics (MPs).
  • To utilize a flexible surface-enhanced Raman scattering (SERS) substrate for efficient MP capture and signal enhancement.

Main Methods:

  • Fabrication of a flexible SERS substrate by doping filter paper with gold nanoparticles (AuNPs).
  • Utilizing the electromagnetic (EM) hot spots generated by AuNPs to enhance the Raman signal of MPs.
  • Assessing the substrate's sensitivity and enhancement factor (EF) for polyethylene terephthalate (PET) in water.

Main Results:

  • The developed SERS substrate effectively captures hydrophobic MPs within its fiber pores.
  • A minimum detectable concentration of 0.1 g L-1 for PET was achieved.
  • The maximum enhancement factor (EF) reached 360.5, demonstrating significant signal amplification.
  • Successful detection of MPs in real-world samples like tap water and pond water.

Conclusions:

  • The gold nanoparticle-doped filter paper provides a highly sensitive and reproducible SERS substrate for MP detection.
  • This method offers a practical, on-site solution for monitoring microplastic pollution in aquatic environments.
  • The research presents an accessible and efficient approach for environmental microplastic analysis.