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<p>Overcoming the challenge of decoupling impedance matching from attenuation for low-frequency (2–10&#xa0;GHz) electromagnetic wave absorption, this work presents a defect-engineered multiphase medium-entropy sulfide composite. Synthesized via integrated mechanical alloying and surfactant-assisted hydrothermal sulfidation, the composite integrates sulfur vacancy-rich (Fe,Co,Ni)<sub>9</sub>S<sub>8</sub>, anisotropic FeCoNi alloy, CoFe₂O₄, and porous MoS<sub>2</sub>. This architecture creates abundant heterogeneous interfaces and interfacial sulfur vacancies, significantly enhancing defect-induced polarization and dielectric loss via the “Janus effect.” Concurrently, the magnetic components boost magnetic loss while optimizing impedance matching. Benefiting from this magneto-dielectric synergy, the composite achieves exceptional absorption: a minimum reflection loss (<i>RL</i><sub><i>min</i></sub>) of -50.4 dB at 3.96&#xa0;GHz and a remarkable <i>RL</i><sub><i>min</i></sub> -77.5 dB at 9&#xa0;GHz. Radar cross-section simulations confirm application potential. This work provides strategic insights for designing innovative low-/mid-frequency absorbers through synergistic dielectric-magnetic loss in polymetallic sulfide heterostructures.</p>

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Defect-interface engineering optimizes polymetallic sulfides-based absorbers toward high-efficiency low-/middle-frequency electromagnetic wave absorption

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  • 出版模式：

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  • 发表日期：

    2025年12月2日

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  • Rui Guo,
  • Shutong Li,
  • RongXia Duan,
  • Yunjun Sun,
  • Jianhui Li,
  • Yanzhao Wu,
  • Lianjun Wang,
  • Wan Jiang

摘要

Overcoming the challenge of decoupling impedance matching from attenuation for low-frequency (2–10 GHz) electromagnetic wave absorption, this work presents a defect-engineered multiphase medium-entropy sulfide composite. Synthesized via integrated mechanical alloying and surfactant-assisted hydrothermal sulfidation, the composite integrates sulfur vacancy-rich (Fe,Co,Ni)9S8, anisotropic FeCoNi alloy, CoFe₂O₄, and porous MoS2. This architecture creates abundant heterogeneous interfaces and interfacial sulfur vacancies, significantly enhancing defect-induced polarization and dielectric loss via the “Janus effect.” Concurrently, the magnetic components boost magnetic loss while optimizing impedance matching. Benefiting from this magneto-dielectric synergy, the composite achieves exceptional absorption: a minimum reflection loss (RLmin) of -50.4 dB at 3.96 GHz and a remarkable RLmin -77.5 dB at 9 GHz. Radar cross-section simulations confirm application potential. This work provides strategic insights for designing innovative low-/mid-frequency absorbers through synergistic dielectric-magnetic loss in polymetallic sulfide heterostructures.