Collective orientation of CNT coated magnetic microchains for effective microwave absorption in S and C band  

作　　者：You Wu Yixuan Han Jinwen Hu Na He Mukun He Hua Guo Haihong Xu Zhongwu Liu Yali Zhang Wenbo Ju 

机构地区：[1]School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510640,China [2]Shaanxi Key Laboratory of Macromolecular Science and Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,China [3]School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China

出　　处：《Journal of Materials Science & Technology》2024年第29期215-223,共9页材料科学技术(英文版)

基　　金：financial support from the National Natural Science Foundation of China(Nos.U21A2093,and 12104164);partially financed by the Polymer Electro-magnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars.

摘　　要：The control of undesired electromagnetic radiation in S-and C-band spectra requires novel microwave absorbing materials(MAMs)having high microwave attenuation capability together with optimal impedance matching.CNTs are conformally coated onto the surface of one-dimensional FeCo-based magnetic microchains via electrostatic self-assembly,and then the magnetic inclusions are collectively oriented in matrices by applying an external magnetic field.The proper incorporation of CNTs with magnetic microchains demonstrates a feasible pathway for effectively absorbing microwaves in the S and C band.MAMs consisting of oriented microchains have anisotropic complex permittivity,of which the real part ranges from 6.1 to 30.4 at 2 GHz.When the electric field is parallel to microchains,the 5-mm-thick MAM has an effective absorbing bandwidth(EAB)in the range of 2.3 to 2.9 GHz,and reduces the radar cross section to be lower than-15.9 dB m^(2) from the vertical to the glancing incidence.When the magnetic field is parallel to microchains,the MAM adsorbs C-band microwaves with an EAB of 1.5 GHz,and achieves maximal reflection loss of-46.4 dB.The collective orientation of shape-anisotropic magnetic materials,in addition to the composition and microstructure,is a new variable for the design of effective MAMs.

关 键 词：Radar absorbing material Magnetic microchain CNT Electrostatic self-assembly Collective orientation 

分 类 号：TB3[一般工业技术—材料科学与工程]