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<p>Synergistic design of rational heterogeneous interface structure and magnetic components can effectively regulate and enhance the polarization loss and magnetic loss capacity of metal-organic frameworks (MOFs) derived magnetic carbon-based composites, thereby improving their microwave absorption performance with low thickness and broad absorption bandwidth. In this work, a novel two-dimensional core-shell structured Co@C/Fe composites were fabricated through the deposition of Fe on bimetallic flaky Co/Zn MOFs, followed by thermal decomposition. Results revealed that the pyrolysis temperature has a significant impact on the composition, morphology, magnetic properties, and microwave absorption performance of the as-obtained composites. After pyrolyzing at 700 °C, the flaky core-shell structured Co@C/Fe composites exhibit excellent microwave absorption performance. Specifically, the minimum reflection loss can reach -86.15&#xa0;dB with an ultrathin thickness of 1.38&#xa0;mm, and the effective absorption bandwidth can extend to 5.1&#xa0;GHz at a low thickness of 1.51&#xa0;mm. The introduction of the core-shell structure and the magnetic Fe shell played critical roles on the enhanced microwave absorption performance. It is believed that this work may offer a new paradigm and approach for the preparation of ultrathin and high-performance MOFs-derived microwave absorption materials, thereby expanding the application scope of MOFs.</p> Graphical abstract <p></p>

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Rational construction of MOFs-derived two-dimensional core-shell structured Co@C/Fe composites as ultrathin and high-performance microwave absorption materials

  • 期刊论文

  • 发表日期：

    2025年1月18日

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  • Chaoqun Ge,
  • Liuying Wang,
  • Lixin Wang,
  • Gu Liu,
  • Kejun Xu,
  • Long Wang,
  • Bin Wang,
  • Mengzhou Chen,
  • Weichao Wang,
  • Jie Huang

摘要

Synergistic design of rational heterogeneous interface structure and magnetic components can effectively regulate and enhance the polarization loss and magnetic loss capacity of metal-organic frameworks (MOFs) derived magnetic carbon-based composites, thereby improving their microwave absorption performance with low thickness and broad absorption bandwidth. In this work, a novel two-dimensional core-shell structured Co@C/Fe composites were fabricated through the deposition of Fe on bimetallic flaky Co/Zn MOFs, followed by thermal decomposition. Results revealed that the pyrolysis temperature has a significant impact on the composition, morphology, magnetic properties, and microwave absorption performance of the as-obtained composites. After pyrolyzing at 700 °C, the flaky core-shell structured Co@C/Fe composites exhibit excellent microwave absorption performance. Specifically, the minimum reflection loss can reach -86.15 dB with an ultrathin thickness of 1.38 mm, and the effective absorption bandwidth can extend to 5.1 GHz at a low thickness of 1.51 mm. The introduction of the core-shell structure and the magnetic Fe shell played critical roles on the enhanced microwave absorption performance. It is believed that this work may offer a new paradigm and approach for the preparation of ultrathin and high-performance MOFs-derived microwave absorption materials, thereby expanding the application scope of MOFs.

Graphical abstract