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<p>Metal–organic framework (MOF)-derived lightweight carbon-based microwave-absorbing materials show promising applications in electromagnetic protection, yet they still face challenges such as impedance mismatch between absorbers and free space, as well as difficulties in balancing magnetic-dielectric absorption. To address these issues, this study employs a synergistic strategy combining cation doping and magnetic component hybridization. Through a facile hydrothermal doping-impregnation-annealing process, morphology-controlled carbon/CoO/Co/NiFe<sub>2</sub>O<sub>4</sub> composites were derived from MIL-88A. By rationally regulating their structure and composition, the composites achieve tunable impedance matching capabilities. Also, the absorber simultaneously strengthens multi-interfacial polarization losses while synergistically coupling magnetic resonance with eddy current dissipation. Consequently, the composite demonstrates exceptional absorption performance at an ultrathin thickness of 1.4&#xa0;mm, with a strong reflection loss of −50.48&#xa0;dB and an effective absorption bandwidth of 5&#xa0;GHz. This work provides valuable theoretical guidance for optimizing impedance matching and manipulating absorption mechanisms in MOF-derived microwave absorbers.</p> Graphical Abstract <p></p>

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Cationic Doping and Magnetic Recombination Strategies to Regulate Magnetic-Dielectric Balance in Fe-MOF Derived Composite for High-Efficiency Electromagnetic Protection

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Jiarui Zeng,
  • Jitao Cen,
  • Houhui Huang,
  • Jianjun Wang,
  • Zhaoli Shen,
  • Pengfei Yin

摘要

Metal–organic framework (MOF)-derived lightweight carbon-based microwave-absorbing materials show promising applications in electromagnetic protection, yet they still face challenges such as impedance mismatch between absorbers and free space, as well as difficulties in balancing magnetic-dielectric absorption. To address these issues, this study employs a synergistic strategy combining cation doping and magnetic component hybridization. Through a facile hydrothermal doping-impregnation-annealing process, morphology-controlled carbon/CoO/Co/NiFe2O4 composites were derived from MIL-88A. By rationally regulating their structure and composition, the composites achieve tunable impedance matching capabilities. Also, the absorber simultaneously strengthens multi-interfacial polarization losses while synergistically coupling magnetic resonance with eddy current dissipation. Consequently, the composite demonstrates exceptional absorption performance at an ultrathin thickness of 1.4 mm, with a strong reflection loss of −50.48 dB and an effective absorption bandwidth of 5 GHz. This work provides valuable theoretical guidance for optimizing impedance matching and manipulating absorption mechanisms in MOF-derived microwave absorbers.

Graphical Abstract