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Vol. 13 (2021)

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

https://doi.org/10.1007/s40820-020-00572-5
Chunyang Xu
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Lei Wang
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Xiao Li
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Xiang Qian
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Zhengchen Wu
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Wenbin You
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Ke Pei
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Gang Qin
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Qingwen Zeng
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Ziqi Yang
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Chen Jin
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China
Renchao Che
Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, People’s Republic of China

Corresponding Author: Renchao Che

rcche@fudan.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 47

Abstract

Hierarchical magnetic-dielectric composites are promising functional materials with prospective applications in microwave absorption (MA) field. Herein, 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 frameworks-based ligand exchange strategy followed by a carbonization treatment with melamine. Abundant 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 material. Ligand 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 shell. Mo2N@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 GHz. The 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 rods” matrix build multi-scale magnetic coupling network and reinforce magnetic response capability, confirmed by the off-axis electron holography.


Highlights:


1 Three-dimension hierarchical core–shell Mo2N@CoFe@C/CNT composites were successfully constructed via a fast MOF-based ligand exchange strategy.
2 Abundant magnetic CoFe nanoparticles suspended within “nanotubes on microrods” matrix exhibited strong magnetic loss capability, confirmed by off-axis electron holography.
3 Hierarchical Mo2N@CoFe@C/CNT composites displayed remarkable microwave absorption value of − 53.5 dB.

Keywords

Hierarchical core–shell MOF-based composites CoFe nanoparticles Magnetic network Microwave absorption
Xu, Chunyang, Lei Wang, Xiao Li, Xiang Qian, Zhengchen Wu, Wenbin You, Ke Pei, Gang Qin, Qingwen Zeng, Ziqi Yang, Chen Jin, and Renchao Che. 2021. “Hierarchical Magnetic Network Constructed by CoFe Nanoparticles Suspended Within ‘Tubes on Rods’ Matrix Toward Enhanced Microwave Absorption”. Nano-Micro Letters 13 (January):47. https://doi.org/10.1007/s40820-020-00572-5.
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