Multi-dimensional Ni@C-CoNi composites with strong magnetic interaction toward superior microwave absorption  

作　　者：Mengxiao Sun Derong Wang Ziming Xiong Zhongwei Zhang Long Qin Chaochan Chen Fan Wu Panbo Liu 

机构地区：[1]School of Mechanical Engineering,Nanjing University of Science&Technology,Nanjing 210094,China [2]State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China [3]Division of Electron and Electricity Measurement Technology,Shanghai Institute of Measurement and Testing Technology,Shanghai 201203,China [4]School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710129,China [5]School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China

出　　处：《Journal of Materials Science & Technology》2022年第35期176-183,共8页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.52173254,11975124);the Natural Science Foundation of Jiangsu Province (BK20211200);the Natural Science Foundation of Shaanxi Province (No.2022JM-260);the China Postdoctoral Science Foundation (No.2020M681601);the Fundamental Research Funds for the Central Universities (Nos.30920041103,30920021107);the Shanghai Key Laboratory of R&D for Metallic Functional Materials (2021-01);the Open Fund from Henan University of Science and Technology。

摘　　要：Dielectric-magnetic integrated absorbers have attracted arousing attention in microwave absorption,however,it still remains a great challenge to simultaneously achieve superior dielectric polarization and strong magnetic loss.Herein,we propose a multi-scale structure optimization strategy to anchor CoNiMOFs derived OD CoNi alloy onto 1 D core-shell Ni@C surface.By decorating with the poly-dopamine layer,the connection between 1 D NiO and CoNi-MOFs precursors was greatly improved via the electrostatic interaction.Benefiting from the overlapping conductive networks,enhanced interfacial polarization among the multi-dimensional heterogeneous interfaces and strong magnetic interaction,the fabricated multi-dimensional Ni@C-CoNi composites exhibit outstanding microwave absorption.Typically,the optimal reflection loss is as high as-51.4 dB at 1.9 mm,and the effective absorption bandwidth achieves 4.6 GHz with a thickness of only 1.3 mm.This multi-scale structure optimization strategy inspires us with an efficient method to fabricate ideal microwave absorbers and the obtained multi-dimensional composites can be used as promising candidates in electromagnetic radiation protection.

关 键 词：Multi-dimensional composites Synergistic effect Magnetic interaction Microwave absorption 

分 类 号：TB34[一般工业技术—材料科学与工程]