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Magnetically Assembled Ultrablack Surface with Omnidirectional and Broadband Light Absorption.

Huiyong Li1,2, Chen Shen1,3, Shuai Sun1,3

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Researchers developed a novel ultrablack surface using a needle-like array structure for superior light absorption. This nature-inspired material offers exceptional performance for optical devices and solar energy applications.

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array structuremagnetically driven self-assemblyomnidirectional absorptionstructural absorptionultrablack surface

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Ultrablack surfaces are essential for advanced optical applications and solar-heat conversion.
  • Existing ultrablack surfaces often struggle with stability, omnidirectional absorption, and wide spectral range performance.

Purpose of the Study:

  • To develop a novel ultrablack surface with stable and omnidirectional light absorption.
  • To investigate a nature-inspired needle-like array structure (NAS) for enhanced light absorption properties.

Main Methods:

  • Fabrication of a needle-like array structure (NAS) using magnetic composite ink.
  • Self-assembly of NAS under an external magnetic field.
  • Characterization of optical properties, including hemispherical reflectance and angular dependence.

Main Results:

  • Achieved extremely low hemispherical reflectance (≤0.3%) across a wide spectral range (300-2000 nm).
  • Demonstrated stable omnidirectional absorption with insensitivity to incident angles up to 70°.
  • Attributed performance to synergistic structural absorption and magnetic particle light scattering.

Conclusions:

  • The NAS presents one of the darkest surfaces reported, with significant potential for optical and solar energy applications.
  • The material exhibits excellent photothermal conversion, self-cleaning, flexibility, and thermal-aging resistance.
  • Offers a promising alternative for constructing practical ultrablack surfaces.