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

Highlights Three-dimension hierarchical core–shell Mo 2 N@CoFe@C/CNT composites were successfully constructed via a fast MOF-based ligand exchange strategy. Abundant magnetic CoFe nanoparticles suspended within “nanotubes on microrods” matrix exhibited strong magnetic loss capability, confirmed by o...

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Veröffentlicht in:Nano-micro letters Jg. 13; H. 1; S. 47 - 15
Hauptverfasser: Xu, Chunyang, Wang, Lei, Li, Xiao, Qian, Xiang, Wu, Zhengchen, You, Wenbin, Pei, Ke, Qin, Gang, Zeng, Qingwen, Yang, Ziqi, Jin, Chen, Che, Renchao
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Singapore Springer Nature Singapore 01.12.2021
Springer Nature B.V
SpringerOpen
Schlagworte:
Carbon
Carbon nanotubes
CoFe nanoparticles
Composite materials
Core-shell structure
Dielectrics
Dispersion
Engineering
Exchanging
Functional materials
Graphitization
Heterojunctions
Hierarchical core–shell MOF-based composites
Holography
Ligands
Magnetic network
Melamine
Metal-organic frameworks
Microwave absorption
Microwave absorption and EMI shielding
Nanoparticles
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
Rods
Structural hierarchy
CoFe nanoparticles
Hierarchical core–shell MOF-based composites
Magnetic network
Microwave absorption
ISSN:2311-6706, 2150-5551, 2150-5551
Online-Zugang:Volltext
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Zusammenfassung:Highlights Three-dimension hierarchical core–shell Mo 2 N@CoFe@C/CNT composites were successfully constructed via a fast MOF-based ligand exchange strategy. Abundant magnetic CoFe nanoparticles suspended within “nanotubes on microrods” matrix exhibited strong magnetic loss capability, confirmed by off-axis electron holography. Hierarchical Mo 2 N@CoFe@C/CNT composites displayed remarkable microwave absorption value of − 53.5 dB. 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 Mo 2 N rod (Mo 2 N@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 Mo 2 N as core and spatially dispersed CoFe nanoparticles within C/CNTs as shell. Mo 2 N@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 Mo 2 N@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 Mo 2 N 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.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:2311-6706
2150-5551
2150-5551
DOI:10.1007/s40820-020-00572-5