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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 2: 340 - 344

DOI: https://doi.org/10.3724/SP.J.1077.2009.00340

Research Paper

Synthesis and Microwave Absorption of the Silica-coated Fe Nanocomposites

  • WANG Deng-Ke ,
  • HUANG Hao ,
  • YU Kuai ,
  • ZHANG Xue-Feng ,
  • DONG Xing-Long
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  • State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, and School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China

Received date: 2008-07-10

  Revised date: 2008-09-08

  Online published: 2009-03-20

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Abstract

Silica-coated Fe nanocomposites were prepared by the DC arc plasma in a mixed atmosphere of hydrogen (H2) and argon (Ar). The phase structure, composition and morphology of silica-coated Fe nanocomposites were examined by X-ray diffraction(XRD), transmission electron microscope(TEM) and electron energy dispersive spectroscope(EDS). The results show that the mean size of silica-coated Fe nanocomposites is about 50nm, and the amorphous silica which cover BCC-Fe cores form nanorods with the length of 150-200nm. The growth mechanism of silicacoated Fe nanocomposites is governed by an extended vaporliquidsolid mechanism and Fe nanoparticles acted as a catalyst for the growth of the nanorods. Its electromagnetic parameters are measured in the range from 2GHz to 18GHz. It is calculated that the maximum reflection loss of silica-coated Fe nanocomposites can reach -14.5dB at 15.4GHz with 1.79mm in thickness, and the bandwidth with a reflection loss less than -10dB is from 8-18GHz. The indepth study of relative complex permittivity and permeability reveals that the excellent microwave absorption properties are the consequence of a proper EM match in microstructure. And the loss mechanism is natural resonance, as the consequence of the increased surface anisotropic energy for nanosized particles.

Key words： non-equilibrium physical vapor condensation; core/shell-type nanocomposite particles; microwave absorption

Cite this article

WANG Deng-Ke , HUANG Hao , YU Kuai , ZHANG Xue-Feng , DONG Xing-Long . Synthesis and Microwave Absorption of the Silica-coated Fe Nanocomposites[J]. Journal of Inorganic Materials, 2009 , 24(2) : 340 -344 . DOI: 10.3724/SP.J.1077.2009.00340

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