Hierarchical Magnetic Network Constructed by CoFe Nanoparticles Suspended Within “Tubes on Rods” Matrix Toward Enhanced Microwave Absorption

作     者：Chunyang Xu Lei Wang Xiao Li Xiang Qian Zhengchen Wu Wenbin You Ke Pei Gang Qin Qingwen Zeng Ziqi Yang Chen Jin Renchao Che Chunyang Xu;Lei Wang;Xiao Li;Xiang Qian;Zhengchen Wu;Wenbin You;Ke Pei;Gang Qin;Qingwen Zeng;Ziqi Yang;Chen Jin;Renchao Che

作者机构：Laboratory of Advanced MaterialsDepartment of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials(iChem)Fudan UniversityShanghai 200438People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2021年第13卷第3期

页      面：80-94页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：This work was supported by the Ministry of Science and Technology of China(973 Project No.2018YFA0209102) the National Natural Science Foundation of China(11727807,51725101,51672050,61790581) 

主　　题：Hierarchical core-shell MOF-based composites CoFe nanoparticles Magnetic network Microwave absorption 

摘      要：Hierarchical magnetic-dielectric composites are promising functional materials with prospective applications in microwave absorption(MA)***,a three-dimension hierarchical“nanotubes on microrods,core–shell magnetic metal–carbon composite is rationally constructed for the first time via a fast metal–organic frameworksbased ligand exchange strategy followed by a carbonization treatment with *** magnetic CoFe nanoparticles are embedded within one-dimensional graphitized carbon/carbon nanotubes supported on micro-scale Mo2N rod(Mo2N@CoFe@C/CNT),constructing a special multi-dimension hierarchical MA *** exchange reaction is found to determine the formation of hierarchical magnetic-dielectric composite,which is assembled by dielectric Mo2N as core and spatially dispersed CoFe nanoparticles within C/CNTs as ***2N@CoFe@C/CNT composites exhibit superior MA performance with maximum reflection loss of−53.5 dB at 2 mm thickness and show a broad effective absorption bandwidth of 5.0 *** Mo2N@CoFe@C/CNT composites hold the following advantages:(1)hierarchical core–shell structure offers plentiful of heterojunction interfaces and triggers interfacial polarization,(2)unique electronic migration/hop paths in the graphitized C/CNTs and Mo2N rod facilitate conductive loss,(3)highly dispersed magnetic CoFe nanoparticles within“tubes on rodsmatrix build multi-scale magnetic coupling network and reinforce magnetic response capability,confirmed by the off-axis electron holography.