Microstructure and microwave absorption properties of carbon-coated iron nanocapsules
Microstructure and microwave absorption properties of carbon-coated iron nanocapsules
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DOI：
10.1088/0022-3727/40/17/056
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发表时间：
2007-09-07
影响因子：
3.4
通讯作者：
Choi, C. J.
中科院分区：
文献类型：
--
作者：
Zhang, X. F.;Dong, X. L.;Choi, C. J.
采用改进的电弧放电法制备了碳包覆Fe [Fe（C）]纳米胶囊，利用透射电镜、拉曼光谱和网络分析仪研究了其微观结构和电磁（2-18 GHz）性能。在3.2 - 18 GHz的频率范围内，获得了小于-20 dB的反射损耗R。当吸收体厚度为3.1mm时，在9.6GHz处的反射损耗最小为-43.5dB。通过对相对复介电常数和相对复磁导率的深入研究，发现其优异的吸波性能是微结构匹配、强的自然共振以及多极化机制等共同作用的结果。
Carbon-coated Fe [Fe(C)] nanocapsules were synthesized by a modified arc-discharge method, and their microstructure and electromagnetic (EM) properties (2-18 GHz) were investigated by means of transmission electron microscopy, Raman spectroscopy and a network analyser. The reflection loss R of less than -20 dB was obtained in the frequency range 3.2-18 GHz. A minimum reflection loss of -43.5 dB was reached at 9.6GHz with an absorber thickness of 3.1mm. The in-depth study of relative complex permittivity and permeability reveals that the excellent microwave absorption properties are a consequence of a proper EM match in microstructure, a strong natural resonance, as well as multi-polarization mechanisms, etc.