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A Superhydrophilic Au-Coated Monolayer Polystyrene Sphere Substrate for Uniform Surface-Enhanced Raman Spectroscopy.

Kittidhaj Dhanasiwawong1, Kruawan Wongpanya1, Tossaporn Lertvanithphol1

  • 1National Electronics and Computer Technology Center, 112 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand.

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Summary

Researchers developed a superhydrophilic SERS substrate using gold-coated polystyrene spheres. This novel material enhances signal detection for improved surface-enhanced Raman spectroscopy (SERS) applications.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Reproducible surface-enhanced Raman spectroscopy (SERS) requires uniform molecular dispersion and strong signal enhancement.
  • Conventional SERS substrates often exhibit poor wettability, causing nonuniform analyte deposition and signal fluctuations.

Purpose of the Study:

  • To develop a superhydrophilic SERS substrate with excellent wettability and tunable plasmonic properties.
  • To address the limitations of conventional SERS substrates in terms of analyte deposition and signal consistency.

Main Methods:

  • Fabrication of gold-coated monolayer polystyrene spheres (Au-MPS) using doctor-blade-assisted colloidal lithography followed by gold sputtering.
  • Characterization using optical, morphological, and spectroscopic techniques.
  • Evaluation of SERS performance with Rhodamine 6G and paraquat detection.

Main Results:

  • The Au-MPS substrate demonstrated excellent wettability and tunable plasmonic properties.
  • A maximum enhancement factor of approximately 105-fold was achieved.
  • A limit of detection in the micromolar range was obtained for Rhodamine 6G.
  • Successful detection of trace levels of paraquat herbicide was demonstrated.

Conclusions:

  • The developed Au-MPS substrate offers a promising solution for reproducible and sensitive SERS measurements.
  • Scalable fabrication and consistent performance indicate potential for cost-effective and practical sensing applications.
  • The substrate shows potential for real-world applications, including environmental monitoring.