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<p>In this study, CoFe<sub>2</sub>O<sub>4</sub>/graphene foam composites were fabricated via a two-step hydrothermal method, and five groups of samples with different ratios were obtained by adjusting the addition amount of graphene foam. It was found that the content of graphene foam significantly affects the microstructure, phase structure, and electromagnetic parameters of the composites. Experimental results show that the composites exhibit excellent microwave absorption performance at low filling ratios: Sample 2# achieves a minimum reflection loss (RL) of −&#xa0;36.32&#xa0;dB at 10.16&#xa0;GHz with a matching thickness of 2.22&#xa0;mm; Sample 3# attains an effective absorption bandwidth (EAB) of 5.44&#xa0;GHz (12.56 ~ 18&#xa0;GHz) with a matching thickness of 1.53&#xa0;mm, covering a broad frequency range. Analysis of the absorption mechanism reveals that the material is dominated by electrical loss and supplemented by magnetic loss: the high conductivity of graphene foam and the interface region between graphene foam and CoFe₂O₄ form the main electrical loss through defect-induced dipole polarization and interface polarization, while the natural resonance of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles and exchange resonance caused by domain wall motion contribute to magnetic loss. In addition, the three-dimensional porous structure of graphene foam provides multiple reflection and scattering paths for EMWs, which synergistically enhances the attenuation capability with the electromagnetic loss mechanism. This study confirms that regulating the content of graphene foam can optimize the conductive network and interface polarization behavior of the material, providing a new idea for designing lightweight microwave absorption materials with both broadband absorption and strong attenuation capabilities.</p>

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Preparation and microwave absorption properties of lightweight broadband CoFe2O4/graphene foam composites

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Lixing Chen,
  • Zhen Liu,
  • Bo Wang,
  • Shicheng Wei,
  • Wei Huang,
  • Yujiang Wang,
  • Yi Liang,
  • Xinyang Wang,
  • Zhengjie Yang

摘要

In this study, CoFe2O4/graphene foam composites were fabricated via a two-step hydrothermal method, and five groups of samples with different ratios were obtained by adjusting the addition amount of graphene foam. It was found that the content of graphene foam significantly affects the microstructure, phase structure, and electromagnetic parameters of the composites. Experimental results show that the composites exhibit excellent microwave absorption performance at low filling ratios: Sample 2# achieves a minimum reflection loss (RL) of − 36.32 dB at 10.16 GHz with a matching thickness of 2.22 mm; Sample 3# attains an effective absorption bandwidth (EAB) of 5.44 GHz (12.56 ~ 18 GHz) with a matching thickness of 1.53 mm, covering a broad frequency range. Analysis of the absorption mechanism reveals that the material is dominated by electrical loss and supplemented by magnetic loss: the high conductivity of graphene foam and the interface region between graphene foam and CoFe₂O₄ form the main electrical loss through defect-induced dipole polarization and interface polarization, while the natural resonance of CoFe2O4 nanoparticles and exchange resonance caused by domain wall motion contribute to magnetic loss. In addition, the three-dimensional porous structure of graphene foam provides multiple reflection and scattering paths for EMWs, which synergistically enhances the attenuation capability with the electromagnetic loss mechanism. This study confirms that regulating the content of graphene foam can optimize the conductive network and interface polarization behavior of the material, providing a new idea for designing lightweight microwave absorption materials with both broadband absorption and strong attenuation capabilities.