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<p>Single-component carbon-based microwave absorbers are frequently constrained by simplistic loss mechanisms, inadequate impedance matching, and a narrow effective absorption bandwidth (EAB). This work utilizes expanded graphite as the matrix, integrates carbon nanotube bundles and cobalt ferrite through an in situ hydrothermal approach to fabricate dielectric-magnetic synergistic composite microwave absorbers with a hierarchical architecture. Hierarchical structure regulation, synergistic dielectric-magnetic loss coupling, and defect polarization tuning are adopted to strengthen electromagnetic wave attenuation performance and optimize overall impedance matching behavior. The micromorphology, crystal phase structure, chemical composition, and electromagnetic properties of the prepared samples were comprehensively characterized using SEM, TEM, XRD, XPS, Raman spectroscopy, and vector network analysis. The findings demonstrate that the optimized EG-CFO-CNB ternary composite exhibits superior microwave absorption performance. With a thin layer thickness of 1.8&#xa0;mm, the material achieves a minimum RL value of − 51.74&#xa0;dB, alongside a 2.88&#xa0;GHz effective absorption region (RL ≤  − 10&#xa0;dB). This work offers a practical experimental foundation and theoretical guidance for the development of high-performance, broadband carbon-based composite microwave absorbers.</p>

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Fabrication and microwave absorption performance of expanded graphite/cobalt ferrite/carbon nanotube bundles composites

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Xuefang Chen,
  • Shuang Xu,
  • Liying Che,
  • Jianfeng Zhao,
  • Kaichuang Zhang,
  • Qinghai Liu,
  • Xiaodong Dai

摘要

Single-component carbon-based microwave absorbers are frequently constrained by simplistic loss mechanisms, inadequate impedance matching, and a narrow effective absorption bandwidth (EAB). This work utilizes expanded graphite as the matrix, integrates carbon nanotube bundles and cobalt ferrite through an in situ hydrothermal approach to fabricate dielectric-magnetic synergistic composite microwave absorbers with a hierarchical architecture. Hierarchical structure regulation, synergistic dielectric-magnetic loss coupling, and defect polarization tuning are adopted to strengthen electromagnetic wave attenuation performance and optimize overall impedance matching behavior. The micromorphology, crystal phase structure, chemical composition, and electromagnetic properties of the prepared samples were comprehensively characterized using SEM, TEM, XRD, XPS, Raman spectroscopy, and vector network analysis. The findings demonstrate that the optimized EG-CFO-CNB ternary composite exhibits superior microwave absorption performance. With a thin layer thickness of 1.8 mm, the material achieves a minimum RL value of − 51.74 dB, alongside a 2.88 GHz effective absorption region (RL ≤  − 10 dB). This work offers a practical experimental foundation and theoretical guidance for the development of high-performance, broadband carbon-based composite microwave absorbers.