J. Mater. Sci. Technol. ›› 2022, Vol. 107: 100-110.DOI: 10.1016/j.jmst.2021.07.044

• Research Article • Previous Articles     Next Articles

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

Biao Zhaoa,c, Yang Lie, Qingwen Zenga, Bingbing Fand, Lei Wanga, Rui Zhangc,d, Renchao Chea,b,*()   

  1. aLaboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China
    bDepartment of Materials Science, Fudan University, Shanghai 200438, China
    cHenan Key Laboratory of Aeronautical Materials and Application Technology, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, Henan 450046, China
    dSchool of Material Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
    eState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2021-06-10 Revised:2021-07-06 Accepted:2021-07-08 Published:2022-04-30 Online:2022-04-28
  • Contact: Renchao Che
  • About author:*Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, China. E-mail address: rcche@fudan.edu.cn (R. Che).

Abstract:

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 core-shell 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 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.

Key words: Microwave absorption, Core-shell structure, C@magnetic metal composite, Interfacial polarization, Magnetic coupling