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<p>High-performance electromagnetic wave absorbing materials play a crucial role in suppressing electromagnetic radiation. Heterointerface engineering and heteroatom doping strategies have been considered a promising approach for enhancing polarization loss and enriching electromagnetic attenuation mechanisms. Here, we present a novel design of a core-double-shell structure by introducing N atoms into the outer shell, forming a unique heterogeneous C@FeCo@C nanosphere. The morphology, composition, dielectric and magnetic properties of the samples were systematically investigated. Such a distinctive multilayer structure endows the hybrid materials with several advantageous features: (i) abundant heterogeneous interfaces between carbon and FeCo, which result in enhanced interfacial polarization loss; (ii) a magnetic coupling network within each dielectric unit that strengthens the magnetic response behavior; (iii) dipole polarizations induced by nitrogen doping, which further improves the attenuation ability for the incident wave. Consequently, the as-prepared multilayer carbon nanocomposite demonstrates excellent microwave absorption performance, with a minimum reflection loss of − 56.6&#xa0;dB and an effective absorption bandwidth of 6.5&#xa0;GHz at thickness of 2.0&#xa0;mm. This work inspires the development of new strategies for carbon-based nanocomposite through heterointerface engineering.</p>

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Heterogeneous nanospheres comprising FeCo core encapsulated in double-shelled carbon for high-efficiency electromagnetic wave absorption

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Lei Wang,
  • Liangyun Dong,
  • Yang Kong,
  • Along Chen

摘要

High-performance electromagnetic wave absorbing materials play a crucial role in suppressing electromagnetic radiation. Heterointerface engineering and heteroatom doping strategies have been considered a promising approach for enhancing polarization loss and enriching electromagnetic attenuation mechanisms. Here, we present a novel design of a core-double-shell structure by introducing N atoms into the outer shell, forming a unique heterogeneous C@FeCo@C nanosphere. The morphology, composition, dielectric and magnetic properties of the samples were systematically investigated. Such a distinctive multilayer structure endows the hybrid materials with several advantageous features: (i) abundant heterogeneous interfaces between carbon and FeCo, which result in enhanced interfacial polarization loss; (ii) a magnetic coupling network within each dielectric unit that strengthens the magnetic response behavior; (iii) dipole polarizations induced by nitrogen doping, which further improves the attenuation ability for the incident wave. Consequently, the as-prepared multilayer carbon nanocomposite demonstrates excellent microwave absorption performance, with a minimum reflection loss of − 56.6 dB and an effective absorption bandwidth of 6.5 GHz at thickness of 2.0 mm. This work inspires the development of new strategies for carbon-based nanocomposite through heterointerface engineering.