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

被引：179

作者：

Xu, Chunyang ^{[1
,2
]}

Wang, Lei ^{[1
,2
]}

Li, Xiao ^{[1
,2
]}

Qian, Xiang ^{[1
,2
]}

Wu, Zhengchen ^{[1
,2
]}

You, Wenbin ^{[1
,2
]}

Pei, Ke ^{[1
,2
]}

Qin, Gang ^{[1
,2
]}

Zeng, Qingwen ^{[1
,2
]}

Yang, Ziqi ^{[1
,2
]}

Jin, Chen ^{[1
,2
]}

Che, Renchao ^{[1
,2
]}

机构：

[1] Fudan Univ, Dept Mat Sci, Lab Adv Mat, Shanghai 200438, Peoples R China

[2] Fudan Univ, Collaborat Innovat Ctr Chem Energy Mat iChem, Shanghai 200438, Peoples R China

来源：

NANO-MICRO LETTERS | 2021年 / 13卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Hierarchical core-shell MOF-based composites; CoFe nanoparticles; Magnetic network; Microwave absorption; ELECTROMAGNETIC-WAVE ABSORPTION; METAL-ORGANIC-FRAMEWORKS; CARBON NANOFIBERS; GRAPHITIC SHELLS; OXYGEN REDUCTION; BROAD-BAND; MICROSPHERES; MOFS; ELECTROCATALYSTS; HETEROSTRUCTURES;

D O I：

10.1007/s40820-020-00572-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

HighlightsThree-dimension hierarchical core-shell Mo2N@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 Mo2N@CoFe@C/CNT composites displayed remarkable microwave absorption value of -53.5 dB. AbstractHierarchical 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.

引用

页数：15

共 80 条

[1] Mixed Close-Packed Cobalt Molybdenum Nitrides as Non-noble Metal Electrocatalysts for the Hydrogen Evolution Reaction [J].