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Related Experiment Video

Updated: Jul 24, 2025

Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy
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Fabricating defogging metasurfaces via a water-based colloidal route.

Olena Khoruzhenko1, Volodymyr Dudko1, Sabine Rosenfeldt1

  • 1Department of Chemistry and Bavarian Polymer Institute, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany. Josef.Breu@uni-bayreuth.de.

Materials Horizons
|July 5, 2023
PubMed
Summary

Researchers developed a scalable method for creating metasurfaces with combined optical and thermal properties. These novel coatings efficiently convert sunlight into heat for applications like rapid defogging.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Metamaterials offer unique properties beyond natural materials, spanning electromagnetics, acoustics, and thermal transport.
  • Combining diverse material properties in metamaterials can yield synergistic functions for practical applications.
  • Fabricating robust, facile, and scalable metamaterials remains a significant challenge in the field.

Purpose of the Study:

  • To present an effective protocol for fabricating metasurfaces with combined optical and thermal properties.
  • To demonstrate a scalable and affordable wet colloidal processing method for creating these metasurfaces.
  • To showcase the application of these metasurfaces in efficient solar-to-thermal conversion for defogging.

Main Methods:

  • Utilizing liquid crystalline suspensions of silicate nanosheets with sandwiched gold nanoparticles.

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  • Applying nanosheet suspensions as nanometre-thick coatings onto various substrates via scalable wet colloidal processing.
  • Investigating the coupling of plasmon-enhanced adsorption and anisotropic heat conduction at the nanoscale.

    • Main Results:

    • Transparent coatings efficiently absorb infrared spectrum, converting sunlight into heat.
    • The colloidal metasurface achieves rapid heating for complete defogging (60% faster than uncoated glass) while maintaining visible transparency.
    • The protocol is versatile, allowing for the intercalation of various nanoparticles to tailor physical properties.

    Conclusions:

    • A facile, scalable, and affordable wet colloidal processing protocol enables the creation of functional metasurfaces.
    • These metasurfaces exhibit synergistic optical and thermal properties, demonstrating efficient solar-to-thermal conversion and defogging capabilities.
    • The developed platform provides a versatile toolbox for mimicking metamaterial properties with ease of processing.