In Situ Reduced Multi-Core Yolk-Shell Co@C Nanospheres for Broadband Microwave Absorption

被引：8
作者：
Zhang, Mu [1 ,2 ]
Qiu, Jiahang [1 ,2 ]
Xin, Zhen [1 ,2 ]
Sun, Xudong [1 ,2 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Foshan Grad Sch, Foshan 528311, Peoples R China
来源：
MATERIALS | 2021年 / 14卷 / 16期
基金：
中国国家自然科学基金;
关键词：
multi-core yolk-shell; Co@C nanospheres; microwave absorption; high temperature carbonization; ELECTROMAGNETIC-WAVE ABSORPTION; FACILE SYNTHESIS; MICROSPHERES; COMPOSITES; NANOSTRUCTURES; NANOCOMPOSITES; PERFORMANCE; PROGRESS; SPHERES;
D O I：
10.3390/ma14164610
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The preparation of yolk-shell microwave absorption materials with low density and excellent microwave absorption property requires reasonable design and economical manufacture. In this study, an efficient strategy without any templates or reducing gases has been designed to fabricate multi-core yolk-shell Co@C nanospheres by high temperature carbonization. The results showed that Co3O4 was completely reduced by the carbon shell to metal cobalt at temperatures above 750 degrees C. This unique multi-core yolk-shell structure with shell of 600 nm and multiple cores of tens of nanometers can provide sufficient interface and space to reflect and scatter electromagnetic waves. At the same time, the metal cobalt layer and carbon layer provide magnetic loss ability and dielectric loss ability, respectively, making the composite show good wave absorption performance. The minimal RL value of samples carbonized at 750 degrees C reaches -40 dB and the efficient absorption band reaches 9 GHz with the thickness ranges from 2-9 mm. Therefore, this is a facile, effective and economical strategy to prepare yolk-shell structure, which provides a new idea for the preparation of microwave absorption materials.
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页数：14
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