Fe3Si-core/amorphous-C-shell nanocapsules with enhanced microwave absorption

被引:40
作者
Hua, An [1 ,2 ]
Pan, Desheng [1 ,2 ]
Li, Yong [1 ,2 ]
Luan, Jian [1 ]
Wang, Yu [3 ]
He, Jun [3 ]
Geng, Dianyu [1 ]
Liu, Wei [1 ]
Ma, Song [1 ]
Zhang, Zhidong [1 ]
机构
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
[3] Cent Iron & Steel Res Inst, Div Funct Mat Res, Beijing 100081, Peoples R China
基金
国家重点研发计划;
关键词
Fe3Si nanocapsules; Amorphous C shell; Arc-discharge; Microwave absorption; ONION-LIKE CARBON; X-BAND; ELECTROMAGNETIC PROPERTIES; DIELECTRIC-PROPERTIES; MAGNETIC-PROPERTIES; NANOPARTICLES; NANOCOMPOSITES; PERMITTIVITY; PERFORMANCE; COMPOSITES;
D O I
10.1016/j.jmmm.2018.09.095
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanoscale heterostructures, like core-shell structures, show attractive microwave-absorption characteristics because of the synergetic effects of their dielectric shells and soft-magnetic cores. A new type of nanocapsules with amorphous C shell encapsulating Heusler soft-magnetic Fe3Si alloy has been designed and synthesized in which Si atoms were doped in the C shell to effectively produce a large amount of Si-C bonds to induce the formation of an amorphous C shell. This further significantly improves the dielectric properties of C shells by enhanced dielectric polarization. These tailored Fe3Si/C nanocapsules, exhibit enhanced microwave-absorption properties because of the desirable impedance match between the amorphous C shell and the soft-magnetic Fe3Si. The optimal Fe3Si/C nanocapsules exhibit a highest absorption intensity of - 68.3 dB at 13 GHz and an absorption bandwidth of 4.6 GHz (for RL lower than -10 dB) for absorber thicknesses of 2.1 mm and 1.4 mm, respectively. This new type of nanocapsules is of potential interest for application as novel microwave-absorption material.
引用
收藏
页码:561 / 567
页数:7
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