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

被引：175

作者：

Liu, X. G. ^{[1
]}

Ou, Z. Q. ^{[1
]}

Geng, D. Y. ^{[1
]}

Han, Z. ^{[1
]}

Jiang, J. J. ^{[1
]}

Liu, W. ^{[1
]}

Zhang, Z. D. ^{[1
]}

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Int Ctr Mat Phys, Shenyang 110016, Peoples R China

来源：

CARBON | 2010年 / 48卷 / 03期

基金：

中国国家自然科学基金;

关键词：

MICROWAVE-ABSORPTION PROPERTIES; CARBON-COATED IRON; MAGNETIC-PROPERTIES; THIN-FILMS; NANOCAPSULES; NANOCOMPOSITES; NANOCRYSTALS; FABRICATION; NANOTUBES; VAPOR;

D O I：

10.1016/j.carbon.2009.11.011

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：

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.

引用

页码：891 / 897

页数：7

共 37 条

[1] Synthesis and characterization of core-shell structure silica-coated Fe29.5Ni70.5 nanoparticles [J].