Growth of magnetic metals on carbon microspheres with synergetic dissipation abilities to broaden microwave absorption  

作　　者：Biao Zhao Yang Li Qingwen Zeng Bingbing Fan Lei Wang Rui Zhang Renchao Che 

机构地区：[1]Laboratory of Advanced Materials,Shanghai Key Lab of Molecular Catalysis and Innovative Materials,Fudan University,Shanghai 200438,China [2]Department of Materials Science,Fudan University,Shanghai 200438,China [3]Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Material Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou,Henan 450046,China [4]School of Material Science and Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China [5]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Journal of Materials Science & Technology》2022年第12期100-110,共11页材料科学技术（英文版）

基　　金：financially supported from the National Natural Science Foundation of China (Grant Nos. 51725101, 11727807, 51672050, and 61790581);the Ministry of Science and Technology of China (973 Project No. 2018YFA0209102);Science Foundation for the Excellent Youth Scholars of Henan Province (Grant No. 212300410089);the Support Program for Scientific and Technological Innovation Talents of Higher Education in Henan Province (Grant No. 21HASTIT004);China Postdoctoral Science Foundation (Grant No. 2019M661352)。

摘　　要：Microwave absorption(MA) materials have been captured extensive attentions due to the serious electromagnetic(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 coreshell structural carbon(C) microsphere/magnetic metal composites were fabricated through the combination of an electrostatic assembly approach and subsequent in-situ reduction reaction. The complex permittivity 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 composite 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 a1.8 mm thickness. Broad absorption bandwidth with RL below-10 d B could achieve 6.0 GHz and 6.7 GHz for C@Co and C@Ni Co 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.

关 键 词：Microwave absorption Core-shell structure C@magnetic metal composite Interfacial polarization Magnetic coupling 

分 类 号：TB333[一般工业技术—材料科学与工程]