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Trapping Structural Coloration by a Bioinspired Gyroid Microstructure in Solid State.

En-Li Lin1, Wei-Lun Hsu1, Yeo-Wan Chiang1

  • 1Department of Materials and Optoelectronic Science, National Sun Yat-Sen University , Kaohsiung 80424, Taiwan.

ACS Nano
|December 15, 2017
PubMed
Summary
This summary is machine-generated.

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Researchers developed a new method, trapping of structural coloration (TOSC), to create artificial gyroid photonic crystals. This technique enables tunable and switchable structural coloration in solid-state materials for advanced optical applications.

Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Gyroid photonic crystals, found in butterfly wings, possess unique optical properties due to their intricate microstructures.
  • Synthesizing artificial gyroid materials with visible wavelength periodicity has been a significant challenge, hindering the creation of human-made visible gyroid photonic crystals via self-assembly.

Purpose of the Study:

  • To develop a novel physical approach for fabricating visible-wavelength gyroid photonic crystals.
  • To enable tunable and switchable structural coloration in solid-state gyroid materials without altering molecular weight.

Main Methods:

  • Developed the trapping of structural coloration (TOSC) method.
  • Controlled solvent evaporation (diffusivity and diffusive distance) to preserve the structural coloration of an expanded gyroid lattice from a solvated state to a solid state.
Keywords:
block copolymersgyroidphotonic crystalsstructural colorationtrapping

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  • Utilized single-molecular-weight gyroid block copolymer photonic crystals, demonstrating evapochromism (color change upon solvent evaporation) without additives.

    • Main Results:

    • Successfully fabricated visible-wavelength gyroid photonic crystals using the TOSC method.
    • Achieved tunable and switchable structural coloration in solid-state materials.
    • Observed enhanced reflectivity due to the formation of porous gyroid nanochannels, mimicking natural structures.
    • Demonstrated evapochromism, where structural color is achieved through controlled solvent evaporation.

    Conclusions:

    • The TOSC method provides a viable pathway for creating human-made solid gyroid photonic crystals with controllable optical properties.
    • This technique bypasses the need for molecular weight alteration to tune coloration.
    • The fabricated gyroid photonic crystals show potential applications in optical communication, energy, light-emission, sensors, and displays.