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<p>To address the issue of electromagnetic pollution, FeNi₃@C nanocomposites were synthesized via in situ polymerization coupled with controlled thermal carbonization under programmed temperature gradients. The morphology, crystal structure, elemental distribution, and microwave absorption (MA) properties of the FeNi₃@C nanocomposites were systematically characterized using a suite of complementary analytical techniques. The results demonstrate that the FeNi₃@C nanocomposites exhibit superior microwave absorption performance, characterized by a broad effective absorption bandwidth and favorable impedance matching. Moreover, relative to pristine FeNi₃, the FeNi₃@C nanocomposites exhibit significantly enhanced reflection loss and markedly increased dielectric loss. Among the as-prepared samples, FeNi₃@C-2 (carbonized at 700 °C) exhibited the optimal microwave absorption performance, achieving a minimum reflection loss (RLₘᵢₙ) of −53.94 dB at a matching thickness of 2.13 mm and an effective absorption bandwidth (EAB, defined as RL ≤ −10 dB) spanning 5 GHz. Comparative analysis with recent studies indicates that FeNi₃@C‑2 exhibits the most promising electromagnetic absorption performance. In addition, FeNi₃@C‑2 achieves the most significant radar cross-section (RCS) reduction, reaching approximately 31 dB·m<sup>2</sup>. These results demonstrate that FeNi₃@C‑2 is a promising candidate for broadband, high-efficiency microwave absorbers applicable to radar stealth and electronic warfare systems.</p>

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Design of FeNi3@carbon nanostructure with tunable microwave absorbing property

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Xiaohui Liang,
  • Shouyu Ren,
  • Yuxin Jin,
  • Yifan Wang,
  • Zengming Man

摘要

To address the issue of electromagnetic pollution, FeNi₃@C nanocomposites were synthesized via in situ polymerization coupled with controlled thermal carbonization under programmed temperature gradients. The morphology, crystal structure, elemental distribution, and microwave absorption (MA) properties of the FeNi₃@C nanocomposites were systematically characterized using a suite of complementary analytical techniques. The results demonstrate that the FeNi₃@C nanocomposites exhibit superior microwave absorption performance, characterized by a broad effective absorption bandwidth and favorable impedance matching. Moreover, relative to pristine FeNi₃, the FeNi₃@C nanocomposites exhibit significantly enhanced reflection loss and markedly increased dielectric loss. Among the as-prepared samples, FeNi₃@C-2 (carbonized at 700 °C) exhibited the optimal microwave absorption performance, achieving a minimum reflection loss (RLₘᵢₙ) of −53.94 dB at a matching thickness of 2.13 mm and an effective absorption bandwidth (EAB, defined as RL ≤ −10 dB) spanning 5 GHz. Comparative analysis with recent studies indicates that FeNi₃@C‑2 exhibits the most promising electromagnetic absorption performance. In addition, FeNi₃@C‑2 achieves the most significant radar cross-section (RCS) reduction, reaching approximately 31 dB·m2. These results demonstrate that FeNi₃@C‑2 is a promising candidate for broadband, high-efficiency microwave absorbers applicable to radar stealth and electronic warfare systems.