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2D wrinkle assisted zigzag plasmonic chains for isotropic SERS enhancement.

Ziwen Yu1,2, Swagato Sarkar1, Sezer Seçkin1

  • 1Institute of Physical Chemistry and Polymer Physics, Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), 01069, Dresden, Germany.

Scientific Reports
|January 29, 2025
PubMed
Summary

Researchers developed 2D zigzag wrinkle structures for enhanced nanoparticle assembly. These structures enable stronger plasmonic coupling and tunable resonance for advanced sensing applications.

Keywords:
Plasmonic hotspotsPlasmonic nanoparticlesSERS enhancementTemplate-assisted colloidal self-assemblyZigzag wrinkles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Plasmonics

Background:

  • Template-assisted colloidal self-assembly offers flexibility in designing nanoparticle structures.
  • Current methods face challenges in large-area, cost-effective template fabrication.
  • One-dimensional (1D) nano-wrinkle structures enable linear nanoparticle assembly and plasmonic coupling.

Purpose of the Study:

  • To develop two-dimensional (2D) zigzag wrinkle structures for enhanced nanoparticle assembly.
  • To investigate the plasmonic properties of 2D zigzag nanoparticle assemblies.
  • To explore the potential of these assemblies for sensing applications with tunable resonance.

Main Methods:

  • Fabrication of 2D zigzag wrinkle structures.
  • Colloidal self-assembly of gold nanoparticles onto the 2D templates.
  • Micro spectral measurements for optical characterization.
  • Finite-difference time-domain (FDTD) simulations for analyzing plasmonic coupling.

Main Results:

  • Successful assembly of nanoparticles into 2D plasmonic zigzag chains.
  • Zigzag assemblies exhibit isotropic behavior and enhanced plasmonic coupling compared to 1D assemblies.
  • The polyaniline (PANI) shell allows for pH-tunable plasmonic resonance.

Conclusions:

  • 2D zigzag wrinkle structures provide a versatile platform for advanced nanoparticle assembly.
  • Enhanced plasmonic coupling in 2D zigzag assemblies is beneficial for sensing.
  • pH-responsive PANI shells enable tunable plasmonic properties for tailored applications.