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Compression-Responsive Photonic Crystals Based on Fluorine-Containing Polymers.

Julia Kredel1, Markus Gallei2

  • 1Ernst-Berl Institute of Technical and Macromolecular Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287 Darmstadt, Germany.

Polymers
|January 1, 2020
PubMed
Summary

Novel fluoropolymer photonic crystals exhibit tunable reflection colors responsive to pressure. These materials offer potential for advanced optical sensing and anti-counterfeiting applications.

Keywords:
core-interlayer-shell particlesemulsion polymerizationfluoropolymersmelt-shear organizationself-assemblystimuli-responsiveness

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optics

Background:

  • Fluoropolymers possess unique properties like thermal stability and low refractive indices, making them suitable for optical applications.
  • Photonic crystals utilize ordered structures to manipulate light, with potential in optical sensing.
  • Core-interlayer-shell particle architectures offer unique structural and responsive properties.

Purpose of the Study:

  • To prepare and characterize novel photonic crystals using fluoropolymer-based core-interlayer-shell particles.
  • To investigate the pressure-sensitive optical properties of these fluoropolymer photonic crystals.
  • To explore the potential of these materials for sensing and anti-counterfeiting applications.

Main Methods:

  • Melt-shear organization technique was employed for particle assembly.
  • Core-interlayer-shell particles with fluoropolymer components were synthesized.
  • UV cross-linking agents were incorporated to stabilize and tune the photonic crystal properties.

Main Results:

  • The photonic crystals exhibited remarkable reflection colors due to high order and refractive index contrast, following Bragg's law.
  • The unique particle architecture enabled reversible changes in shape, domain size, and reflection color upon applied pressure.
  • Stable, pressure-sensitive opal films with switchable reflection colors were successfully fabricated.
  • Patterning of opal films by compression and subsequent UV fixation was demonstrated.

Conclusions:

  • Fluoropolymer-based photonic crystals with pressure-tunable reflection colors were successfully developed.
  • These materials demonstrate potential as responsive elements in optical sensing devices.
  • The developed photonic crystals are promising candidates for anti-counterfeiting technologies due to their unique optical responses.