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LSP-SPP Coupling Structure Based on Three-Dimensional Patterned Sapphire Substrate for Surface Enhanced Raman

Shuqi Xie1, Haipeng Si2, Cong Liu1

  • 1Collaborative Innovation Center of Light Manipulations and Applications in Universities of Shandong, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.

Nanomaterials (Basel, Switzerland)
|May 13, 2023
PubMed
Summary

Researchers developed high-performance, mass-producible 3D Surface-Enhanced Raman Spectroscopy (SERS) substrates using photolithography and silver nanoparticles. These substrates offer excellent sensitivity and stability for chemical detection.

Keywords:
3DSERScouplinghydrophobicitylight-capturingphotolithographyreproducibility

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Developing high-performance 3D substrates for Surface-Enhanced Raman Spectroscopy (SERS) is crucial but faces challenges in detection and manufacturability.
  • Existing methods often struggle to balance sensitivity, reproducibility, and large-scale production.

Purpose of the Study:

  • To engineer a novel, mass-producible 3D SERS substrate with enhanced detection capabilities.
  • To investigate the plasmonic coupling and performance characteristics of the fabricated substrate.

Main Methods:

  • Fabrication of a pyramid-like array on a patterned sapphire substrate (PSS) using photolithography.
  • Decoration of gold films with silver nanoparticles (AgNPs) to create the 3D SERS substrate.
  • Utilized finite element method (FEM) for simulation of plasmonic coupling (LSPs and SPPs).

Main Results:

  • Achieved coupling of localized surface plasmon polaritons (LSPs) and surface plasmon polaritons (SPPs) in low fluorescence conditions.
  • Demonstrated high sensitivity with probe molecules rhodamine 6G (R6G) and toluidine blue (TB), reaching detection limits of 10⁻¹¹ M and 10⁻⁹ M, respectively.
  • Exhibited excellent hydrophobicity, light-capturing ability, self-cleaning properties, and long-term stability.

Conclusions:

  • The developed 3D SERS substrate demonstrates high performance, reproducibility, and manufacturability.
  • The substrate's properties make it a promising candidate for large-scale applications in chemical sensing.
  • This work addresses the gap in high-performance, manufacturable 3D SERS substrates.