Multifunctional Carbon Foam with Nanoscale Chiral Magnetic Heterostructures for Broadband Microwave Absorption in Low Frequency  

作　　者：Hao Zhang Kaili Kuang Yifeng Zhang Chen Sun Tingkang Yuan Ruilin Yin Zeng Fan Renchao Che Lujun Pan 

机构地区：[1]School of Physics,Dalian University of Technology,Dalian 116024,Liaoning,People’s Republic of China [2]Laboratory of Advanced Materials,Shanghai Key Lab of Molecular Catalysis and Innovative Materials,Department of Materials Science,Fudan University,Shanghai 200438,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第6期181-197,共17页纳微快报(英文版)

基　　金：supported by the National Natural Science Foundation of China[Grant Nos.52272288 and 51972039];the China Postdoctoral Science Foundation[No.2021M700658].

摘　　要：The construction of carbon nanocoil(CNC)-based chiral-dielectric-magnetic trinity composites is considered as a promising approach to achieve excellent low-frequency microwave absorption.However,it is still challenging to further enhance the low frequency microwave absorption and elucidate the related loss mechanisms.Herein,the chiral CNCs are first synthesized on a threedimensional(3D)carbon foam and then combined with the FeNi/NiFe_(2)O_(4) nanoparticles to form a novel chiral-dielectric-magnetic trinity foam.The 3D porous CNC-carbon foam network provides excellent impedance matching and strong conduction loss.The formation of the FeNi-carbon interfaces induces interfacial polarization loss,which is confirmed by the density functional theory calculations.Further permeability analysis and the micromagnetic simulation indicate that the nanoscale chiral magnetic heterostructures achieve magnetic pinning and coupling effects,which enhance the magnetic anisotropy and magnetic loss capability.Owing to the synergistic effect between dielectricity,chirality,and magnetism,the trinity composite foam exhibits excellent microwave absorption performance with an ultrabroad effective absorption bandwidth(EAB)of 14 GHz and a minimum reflection of loss less than-50 dB.More importantly,the C-band EAB of the foam is extended to 4 GHz,achieving the full C-band coverage.This study provides further guidelines for the microstructure design of the chiral-dielectric-magnetic trinity composites to achieve broadband microwave absorption.

关 键 词：Carbon nanocoils Chiral magnetic structures 3D conductive networks Magnetic pinning effect Broadband microwave absorption 

分 类 号：TB3[一般工业技术—材料科学与工程]