Microwave absorption(MA)materials have been captured extensive attentions due to the serious elec-tromagnetic(EM)pollution.Numerous interests focus on the MA performances of core-shell structural composites with magnetic constituents as cores and dielectric constituents as shells,which inevitably suppressed the magnetic coupling causing the decrease of magnetic loss to some extent.Herein,the core-shell structural carbon(C)microsphere/magnetic metal composites were fabricated through the combi-nation of an electrostatic assembly approach and subsequent in-situ reduction reaction.The complex per-mittivity and permeability of core-shell C@magnetic metal composite system can be effective adjusted by the constituent and microstructure of shells.Thanks to the distinct magnetic coupling from the subtle designed structures and the promotion of the magnetic-dielectric synergy,the C@magnetic metal com-posite exhibited enhanced MA properties.The optimal reflection loss(RL)of C@Ni composite was-54.1 dB with a thickness of 3.4 mm,meanwhile the effective absorbing band could reach over 5.5 GHz at only a 1.8 mm thickness.Broad absorption bandwidth with RL below-10 dB could achieve 6.0 GHz and 6.7 GHz for C@Co and C@NiCo composites with a thin 2.1 mm thickness,respectively.Our exciting findings might lead a guide on the novel structure design for the functional core-shell structural composites used for microwave absorption.

Biao Zhao;Yang Li;Qingwen Zeng;Bingbing Fan;Lei Wang;Rui Zhang;Renchao Che

Laboratory of Advanced Materials,Shanghai Key Lab of Molecular Catalysis and Innovative Materials,Fudan University,Shanghai 200438,China;Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Material Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou,Henan 450046,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;School of Material Science and Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China;Department of Materials Science,Fudan University,Shanghai 200438,China

材料科学技术（英文版）

[1]Biao Zhao;Yang Li;Qingwen Zeng;Bingbing Fan;Lei Wang;Rui Zhang;Renchao Che-.Growth of magnetic metals on carbon microspheres with synergetic dissipation abilities to broaden microwave absorption)[J].材料科学技术（英文版）,2022(12):100-110

mittivity

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