The Effect of Core-Shell Structure on Microwave Absorption Properties of Graphite-Coated Magnetic Nanocapsules

doi:10.1007/s11664-018-6637-3

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	The Effect of Core-Shell Structure on Microwave Absorption Properties of Graphite-Coated Magnetic Nanocapsules
	Feng, Yang 1; Li, Da 1; Bai, Yu 1; Hua, An 1; Pan, Desheng 1; Li, Yong 1; Wang, Yu 2; He, Jun 2; Wang, Zhenhua 1; Zhang, Yajing 3
刊名	JOURNAL OF ELECTRONIC MATERIALS
	2019-03-01
卷号	48 期号:3 页码:1429-1435
关键词	Microwave absorption mechanism impedance matching interface effect core/shell structure
ISSN号	0361-5235
DOI	10.1007/s11664-018-6637-3
通讯作者	Li, Da(dali@imr.ac.cn)
英文摘要	Interface polarization is one important factor in producing a good electromagnetic impedance match and enhancing the microwave-absorption properties of core/shell nanocomposites. However, the effect of the core-shell nanocapsules having insulating shells, and the polarization effect at interfaces of graphite-coated magnetic metallic nanoparticles, on the microwave absorption properties, are not clear. In this work, the microwave-absorption properties of magnetic nanocapsules with alpha-Fe/gamma-Fe(C)/Fe3C as cores and graphite as shells have been investigated in the frequency range 2-18GHz. Partial magnetic cores were removed by a similar to 19wt.% HCl solution from the as-prepared nanocapsules (A-nanocapsules), but the carbon shells were kept constant. Transmission electron microscopy confirms that hollow carbon nanocages are almost the same as the as-prepared shells, except for slight change in shape due to removing the cores. As a result, the complex permeability drops slightly, while the complex permittivity has an obvious increase, which can be ascribed to percolation effects due to the hollow carbon nanocages, rather than the interface polarization originating from the core/shell interfaces and interfaces between the core components of alpha-Fe, gamma-Fe(C) and Fe3C nanocrystals. The optimal reflection loss (RL) value of the A-nanocapsules reaches -27.6 dB at 16.2 GHz for a thickness of 2 mm. This study clarifies that the interface polarization effect in the A-nanocapsules is negligible in enhancing the complex permittivity and the synergetic effect of the magnetic loss of cores, and the dielectric loss of graphite shells is the dominant mechanism in attenuating microwaves.
资助项目	National Natural Science Foundation of China[51171185] ; National Natural Science Foundation of China[51331006] ; National Natural Science Foundation of China[51371055] ; National Natural Science Foundation of China[51301114] ; National Basic Research Program[2012CB933103] ; National Basic Research Program[2017YFA0206302] ; Ministry of Science and Technology of China
WOS研究方向	Engineering ; Materials Science ; Physics
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000457748600018
资助机构	National Natural Science Foundation of China ; National Basic Research Program ; Ministry of Science and Technology of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131567]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Da
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 2.Cent Iron & Steel Res Inst, Div Funct Mat, Beijing 100081, Peoples R China 3.Shenyang Univ Chem Technol, Coll Chem Engn, Shenyang 110142, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Feng, Yang,Li, Da,Bai, Yu,et al. The Effect of Core-Shell Structure on Microwave Absorption Properties of Graphite-Coated Magnetic Nanocapsules[J]. JOURNAL OF ELECTRONIC MATERIALS,2019,48(3):1429-1435.
APA	Feng, Yang.,Li, Da.,Bai, Yu.,Hua, An.,Pan, Desheng.,...&Zhang, Zhidong.(2019).The Effect of Core-Shell Structure on Microwave Absorption Properties of Graphite-Coated Magnetic Nanocapsules.JOURNAL OF ELECTRONIC MATERIALS,48(3),1429-1435.
MLA	Feng, Yang,et al."The Effect of Core-Shell Structure on Microwave Absorption Properties of Graphite-Coated Magnetic Nanocapsules".JOURNAL OF ELECTRONIC MATERIALS 48.3(2019):1429-1435.