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Brilliant Mechanochromic Scattering Structural Colors.

Lishan Zheng1, Na Li1, Chenze Qi1

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ACS Applied Materials & Interfaces
|February 6, 2025
PubMed
Summary

Researchers developed a new mechanochromic photonic crystal (MPC) using zinc sulfide (ZnS) and polyurethane (PU). This novel material exhibits unique color changes when stretched, offering new possibilities for advanced stimulus-responsive materials.

Keywords:
mechanochromicphotonic crystalscatteringsensingstructural color

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Conventional mechanochromic photonic crystals (MPCs) require 3D non-close-packing structures for force-adjustable colors.
  • Existing MPCs have limitations in color saturation and mechanochromic response.

Purpose of the Study:

  • To fabricate a novel MPC with monolayer close-packing structures and brilliant iridescent scattering colors.
  • To investigate the unconventional mechanochromic properties of the new MPC.
  • To explore the relationship between structure, deformation, and optical properties.

Main Methods:

  • Self-assembling zinc sulfide (ZnS) particles into polycrystalline structures.
  • Infiltrating interparticle gaps with elastic polyurethane (PU).
  • Analyzing the mechanochromic response under stretching via optical property measurements.

Main Results:

  • Fabrication of a new MPC with monolayer close-packing structures and high scattering color saturation due to ZnS and PU refractive index contrast.
  • Observation of unique mechanochromic scattering structural colors, red-shifted and blue-shifted along and perpendicular to stretching directions.
  • Demonstration of crystal orientation-dependent deformation influencing the mechanochromic properties.

Conclusions:

  • The new MPC design offers brilliant iridescent scattering colors and unconventional mechanochromic properties.
  • The study advances the understanding of structure-property relationships in photonic materials.
  • This work provides a new perspective for designing advanced stimulus-responsive photonic materials.