Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles

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	Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles; Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles
	X. G. Liu; Z. Q. Ou; D. Y. Geng; Z. Han; J. J. Jiang; W. Liu; Z. D. Zhang
	2010 ; 2010
发表期刊	Carbon ; Carbon
ISSN	0008-6223 ; 0008-6223
卷号	48 期号:3 页码:891-897
摘要	Graphite-coated FeNi alloy nanoparticles have been prepared by a modified arc-discharge method in an alcohol atmosphere and have been characterized by means of X-ray diffraction, energy dispersive spectroscopy, transmission electron microscopy, Raman spectroscopy, thermal gravimetric analysis and scanning differential thermal analysis. The results show that the nanoparticles have a core/shell structure, with FeNi alloy as core and graphite layers as shell. Compared with FeNi nanoparticles with an oxide shell, the graphite shell restricts the growth of the FeNi nanoparticles, which leads to lower saturation magnetization and higher natural-resonance frequency. Due to the enhancement of the thermal stability by the graphite shell and its oxidation protection, the graphite-coated FeNi nanoparticles are stable in air below 240 degrees C. The electromagnetic characteristics of the graphite-coated FeNi nanoparticles have been studied in the 2-18 GHz range. The graphite shell dramatically improves the magnetic/dielectric loss and the attenuation constant in the 9-18 GHz range through the enhancement of the electrical resistivity and the protection of the FeNi cores, leading to enhanced microwave-absorption properties in this range. (C) 2009 Elsevier Ltd. All rights reserved.; Graphite-coated FeNi alloy nanoparticles have been prepared by a modified arc-discharge method in an alcohol atmosphere and have been characterized by means of X-ray diffraction, energy dispersive spectroscopy, transmission electron microscopy, Raman spectroscopy, thermal gravimetric analysis and scanning differential thermal analysis. The results show that the nanoparticles have a core/shell structure, with FeNi alloy as core and graphite layers as shell. Compared with FeNi nanoparticles with an oxide shell, the graphite shell restricts the growth of the FeNi nanoparticles, which leads to lower saturation magnetization and higher natural-resonance frequency. Due to the enhancement of the thermal stability by the graphite shell and its oxidation protection, the graphite-coated FeNi nanoparticles are stable in air below 240 degrees C. The electromagnetic characteristics of the graphite-coated FeNi nanoparticles have been studied in the 2-18 GHz range. The graphite shell dramatically improves the magnetic/dielectric loss and the attenuation constant in the 9-18 GHz range through the enhancement of the electrical resistivity and the protection of the FeNi cores, leading to enhanced microwave-absorption properties in this range. (C) 2009 Elsevier Ltd. All rights reserved.
部门归属	[liu, x. g.; ou, z. q.; geng, d. y.; han, z.; jiang, j. j.; liu, w.; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, inst met res, int ctr mat phys, shenyang 110016, peoples r china.;liu, xg (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, int ctr mat phys, 72 wenhua rd, shenyang 110016, peoples r china;liuxianguohugh@gmail.com ; [liu, x. g.; ou, z. q.; geng, d. y.; han, z.; jiang, j. j.; liu, w.; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, inst met res, int ctr mat phys, shenyang 110016, peoples r china.;liu, xg (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, int ctr mat phys, 72 wenhua rd, shenyang 110016, peoples r china;liuxianguohugh@gmail.com
关键词	Microwave-absorption Properties Microwave-absorption Properties Carbon-coated Iron Carbon-coated Iron Magnetic-properties Magnetic-properties Thin-films Thin-films Nanocapsules Nanocapsules Nanocomposites Nanocomposites Nanocrystals Nanocrystals Fabrication Fabrication Nanotubes Nanotubes Vapor Vapor
URL	查看原文 ; 查看原文
WOS记录号	WOS:000274004700038 ; WOS:000274004700038
引用统计	被引频次：170[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31321
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. G. Liu,Z. Q. Ou,D. Y. Geng,et al. Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles, Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles[J]. Carbon, Carbon,2010, 2010,48, 48(3):891-897, 891-897.
APA	X. G. Liu.,Z. Q. Ou.,D. Y. Geng.,Z. Han.,J. J. Jiang.,...&Z. D. Zhang.(2010).Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles.Carbon,48(3),891-897.
MLA	X. G. Liu,et al."Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles".Carbon 48.3(2010):891-897.