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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Silver microplasma-engineered nanoassemblies on periodic nanostructures for SERS applications.

Zhuo-Fu Wang1, Kai-Chun Tsai1, Wei-Hung Chiang2

  • 1Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan. djsam@mail.ntust.edu.tw.

Physical Chemistry Chemical Physics : PCCP
|September 6, 2024
PubMed
Summary

Researchers developed advanced surface-enhanced Raman scattering (SERS) substrates using periodic nanostructures and silver nanoparticles (AgNPs). These stable, high-performance SERS substrates offer excellent uniformity and sensitivity for chemical detection.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Surface-enhanced Raman scattering (SERS) requires substrates with high surface area and uniformity for optimal performance.
  • Existing SERS substrates often suffer from signal variability and limited stability.
  • Minimizing background signals from substrate materials is crucial for sensitive detection.

Purpose of the Study:

  • To enhance the performance and stability of SERS substrates.
  • To develop a cost-effective and reproducible fabrication method for SERS substrates.
  • To achieve a low limit of detection and high enhancement factor for SERS applications.

Main Methods:

  • Fabrication of periodic nanostructures on polymer substrates using magnetron sputtering to reduce background signal.
  • Deposition of silver nanoparticles (AgNPs) via microplasma nanoparticle coating to enhance SERS efficacy.
  • Characterization of substrate uniformity, stability, and SERS performance.

Main Results:

  • Achieved excellent uniformity with a coefficient of variation (CV) of ~8% for individual substrates and 6% between batches.
  • Demonstrated high signal stability, retaining 85% signal strength after two months of storage.
  • Obtained a low limit of detection of 8.4 × 10-7 M for malachite green with an enhancement factor of 2.69 × 106.

Conclusions:

  • The developed SERS substrates meet commercial product standards for uniformity and stability.
  • The proposed fabrication method offers a promising route for producing high-performance SERS devices.
  • These substrates are suitable for sensitive and reliable chemical detection applications.