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Related Experiment Video

Updated: Jun 16, 2025

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Pyramid Textured Photonic Films with High-Refractive Index Fillers for Efficient Radiative Cooling.

Yuting Fu1, Le Chen2, Yuao Guo1

  • 1Department of Electrical & Electronic Engineering, Southern University of Science and Technology, Xueyuan Road 1088, Nanshan District, Shenzhen, 518055, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 19, 2024
PubMed
Summary

Researchers developed advanced photonic films using micro-pyramid structures and hexagonal boron nitride nanoplates for efficient passive radiative cooling. These films achieve significant sub-ambient temperatures, offering a promising solution for cooling challenges.

Keywords:
hexagonal boron nitride nanoplatesmicro‐pyramid textured photonic filmsradiative coolingscattering fillersthermal conductivity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Passive radiative cooling is crucial for mitigating global warming and reducing energy consumption from active cooling systems.
  • Current radiative cooling devices face challenges in achieving high efficiency and effective heat dissipation.
  • There is a growing need for advanced materials and structures to enhance radiative cooling performance.

Purpose of the Study:

  • To develop highly efficient radiative cooling devices.
  • To synergistically optimize micro-pyramid surface structures and hexagonal boron nitride nanoplates (h-BNNs) for enhanced cooling.
  • To investigate the thermal properties and cooling performance of the developed photonic films.

Main Methods:

  • Fabrication of pyramid-textured photonic films incorporating 2D h-BNNs scattering fillers.
  • Characterization of solar reflectivity and mid-infrared (MIR) emittance of the films.
  • Measurement of through-plane and in-plane thermal conductivity.
  • Evaluation of radiative cooling power and sub-ambient cooling effect under various conditions.

Main Results:

  • Photonic films achieved a solar reflectivity of 98.5% and MIR emittance of 97.2%.
  • h-BNNs enhanced through-plane thermal conductivity to 0.496 W m⁻¹ K⁻¹ and in-plane to 3.175 W m⁻¹ K⁻¹.
  • Optimized films demonstrated a radiative cooling power of 201.2 W m⁻² and a daily sub-ambient cooling effect of up to 11 °C.
  • A sub-ambient cooling of 5 °C was achieved even with internal heat generation and external solar irradiance.

Conclusions:

  • The synergistic optimization of micro-pyramid structures and h-BNNs significantly enhances radiative cooling performance.
  • The developed photonic films show great potential for scalable sub-ambient radiative cooling applications.
  • This strategy offers a promising pathway for developing next-generation cooling technologies.