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<p>To address the critical challenges of magnetic particle agglomeration and impedance mismatch in metal-organic framework (MOF)-derived microwave absorbers, this study proposes a synergistic strategy integrating bimetallic doping, hollow structural engineering, and confined pyrolysis. A topological transformation from solid ZIF-67 to hollow ZIF-67/CoNi-LDH was achieved via a Ni<sup>2+</sup>-induced “etching-coprecipitation” mechanism, followed by the encapsulation of a phenolic resin shell to function as a “confined nanoreactor”. The experimental results demonstrate that the robust carbon shell derived from the resin effectively suppresses the Ostwald ripening of metal components, resulting in the uniform dispersion of high-density CoNi alloy nanoparticles within a nitrogen-doped carbon matrix and the formation of a hierarchical “pompon-like” core-shell architecture. Benefiting from optimized impedance matching provided by the hollow interior and a multi-scale synergistic loss mechanism comprising atomic lattice defects, microscopic Maxwell-Wagner-Sillars interfacial polarization, and mesoscopic multiple scattering the composite exhibits superior electromagnetic wave absorption capabilities. With a low filler loading of 15 wt%, the optimal sample obtained at 850&#xa0;°C achieves a remarkable minimum reflection loss of -55.35 dB at an ultrathin thickness of 1.7&#xa0;mm. This work validates the efficacy of the confined pyrolysis strategy in regulating magneto-dielectric synergy, offering a scalable pathway for next-generation lightweight microwave absorbers.</p>

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Tuning magneto dielectric synergy of CoNi composites via confined pyrolysis for microwave absorption

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月16日

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  • Haoxiang Su,
  • Keqi Wang,
  • Zhihao Song,
  • Mu Zhang,
  • Xiaodong Li,
  • Xudong Sun,
  • Jianlin He,
  • Xiaochen Wang

摘要

To address the critical challenges of magnetic particle agglomeration and impedance mismatch in metal-organic framework (MOF)-derived microwave absorbers, this study proposes a synergistic strategy integrating bimetallic doping, hollow structural engineering, and confined pyrolysis. A topological transformation from solid ZIF-67 to hollow ZIF-67/CoNi-LDH was achieved via a Ni2+-induced “etching-coprecipitation” mechanism, followed by the encapsulation of a phenolic resin shell to function as a “confined nanoreactor”. The experimental results demonstrate that the robust carbon shell derived from the resin effectively suppresses the Ostwald ripening of metal components, resulting in the uniform dispersion of high-density CoNi alloy nanoparticles within a nitrogen-doped carbon matrix and the formation of a hierarchical “pompon-like” core-shell architecture. Benefiting from optimized impedance matching provided by the hollow interior and a multi-scale synergistic loss mechanism comprising atomic lattice defects, microscopic Maxwell-Wagner-Sillars interfacial polarization, and mesoscopic multiple scattering the composite exhibits superior electromagnetic wave absorption capabilities. With a low filler loading of 15 wt%, the optimal sample obtained at 850 °C achieves a remarkable minimum reflection loss of -55.35 dB at an ultrathin thickness of 1.7 mm. This work validates the efficacy of the confined pyrolysis strategy in regulating magneto-dielectric synergy, offering a scalable pathway for next-generation lightweight microwave absorbers.