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Light-Responsive Supramolecular Nanotubes-Based Chiral Plasmonic Assemblies.

Agnieszka Jedrych1, Mateusz Pawlak1, Ewa Gorecka1

  • 1Faculty of Chemistry, University of Warsaw, 1 Pasteur Street, 02-093 Warsaw, Poland.

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Summary

Researchers created dual-responsive chiral plasmonic films using liquid crystals and gold nanoparticles. These films exhibit tunable chiroptical properties controllable by light and temperature, paving the way for advanced optoelectronics.

Keywords:
liquid crystalsnanocompositesorganic nanotubesphotoswitchabilityplasmonic nanoparticlesreversibly reconfigurable assemblysupramolecular self-assembly

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Area of Science:

  • Plasmonics
  • Materials Science
  • Nanotechnology

Background:

  • Chiral plasmonic materials offer unique light-matter interactions.
  • Developing stimuli-responsive chiral materials is crucial for advanced devices.
  • Liquid crystals provide a versatile platform for templating nanoscale structures.

Purpose of the Study:

  • To fabricate dual-responsive (thermo/light) chiral plasmonic films.
  • To investigate the templating role of photoswitchable liquid crystal nanotubes.
  • To explore the control of chiroptical properties via external stimuli.

Main Methods:

  • Fabrication of chiral plasmonic films using liquid crystal (LC) templating.
  • Assembly of gold nanoparticles (Au NPs) into helical structures.
  • Characterization using Circular Dichroism (CD) spectroscopy.
  • Stimuli-responsive studies involving UV/visible light and temperature variations.

Main Results:

  • Successful fabrication of dual-responsive chiral plasmonic films.
  • Confirmation of chiroptical properties with a dissymmetry factor (g-factor) up to 0.2.
  • Demonstration of light-induced isomerization of LCs, leading to nanotube/nanohelix melting.
  • Reversible control of chiroptical response using visible light and temperature adjustments.

Conclusions:

  • The developed films exhibit tunable chiroptical properties.
  • Photoswitchable LCs effectively template chiral assemblies of Au NPs.
  • Dual-responsiveness to light and temperature offers precise control over chiroptical behavior.
  • Potential applications in chiral plasmonics, metamaterials, and optoelectronics.