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<p>Herein, a metal–organic framework (MOF)-confined strategy is developed to fabricate MOF-derived FeCo/carbon nanofiber (CNF) composites as high-performance electromagnetic wave absorbers (EMWA). This approach integrates 2-methylimidazole (2-MI) modification, electrospinning, and controlled carbonization to achieve uniform dispersion and inhibit the agglomeration of magnetic nanoparticles within the carbon matrix. By systematically tuning the precursor aging time, abundant heterogeneous interfaces and structural defects are introduced. Remarkably, the optimized FeCo/CNFs-24 absorber, aged for 24&#xa0;h, exhibits exceptional low-frequency microwave absorption, achieving a minimum reflection loss (RL) of − 55.26&#xa0;dB at 4.40&#xa0;GHz. The outstanding performance is attributed to favorable impedance matching and a synergistic interplay between dielectric and magnetic loss mechanisms, as elucidated by electromagnetic parameter analysis. Furthermore, far-field radar cross-section simulations demonstrate a significant 24.38&#xa0;dB reduction, highlighting the material’s strong potential for practical radar stealth applications. This work provides a novel and effective strategy for the rational design of advanced low-frequency microwave absorbers.</p>

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Flexible FeCo/carbon nanofiber membranes with enhanced low-frequency electromagnetic wave absorption via a MOF confinement strategy

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Yixuan Lu,
  • Kequan Yang,
  • Xiaoyun Long,
  • Qilong Sun,
  • Wei Ye

摘要

Herein, a metal–organic framework (MOF)-confined strategy is developed to fabricate MOF-derived FeCo/carbon nanofiber (CNF) composites as high-performance electromagnetic wave absorbers (EMWA). This approach integrates 2-methylimidazole (2-MI) modification, electrospinning, and controlled carbonization to achieve uniform dispersion and inhibit the agglomeration of magnetic nanoparticles within the carbon matrix. By systematically tuning the precursor aging time, abundant heterogeneous interfaces and structural defects are introduced. Remarkably, the optimized FeCo/CNFs-24 absorber, aged for 24 h, exhibits exceptional low-frequency microwave absorption, achieving a minimum reflection loss (RL) of − 55.26 dB at 4.40 GHz. The outstanding performance is attributed to favorable impedance matching and a synergistic interplay between dielectric and magnetic loss mechanisms, as elucidated by electromagnetic parameter analysis. Furthermore, far-field radar cross-section simulations demonstrate a significant 24.38 dB reduction, highlighting the material’s strong potential for practical radar stealth applications. This work provides a novel and effective strategy for the rational design of advanced low-frequency microwave absorbers.