A study of the magnetic and electromagnetic properties of γ-Fe2O3-multiwalled carbon nanotubes (MWCNT) and Fe/Fe3C-MWCNT composites

P. Xu; X. J. Han; X. R. Liu; B. Zhang; C. Wang; X. H. Wang

doi:10.1016/j.matchemphys.2008.10.010

A study of the magnetic and electromagnetic properties of γ-Fe₂O₃-multiwalled carbon nanotubes (MWCNT) and Fe/Fe₃C-MWCNT composites

P. Xu
, X. J. Han^*
, X. R. Liu
, B. Zhang
, C. Wang
, X. H. Wang

^*Corresponding author for this work

Harbin Institute of Technology
Beijing Institute of Aeronautical Materials

Research output: Contribution to journal › Article › peer-review

96 Scopus citations

Abstract

A ferromagnetic γ-Fe₂O₃-MWCNT composite was prepared by a reverse microemulsion technique, and was transformed to a Fe/Fe₃C-MWCNT composite by further heat-treatment in H₂ atmosphere at 950 °C. TEM result suggests that MWCNTs are both surface decorated and filled with γ-Fe₂O₃ or Fe/Fe₃C nanoparticles. The saturation magnetization and anisotropy field are particularly strong for Fe/Fe₃C-MWCNT. The reflection loss of Fe/Fe₃C-MWCNT is better than that of γ-Fe₂O₃-MWCNT at all frequencies between 2 and 18 GHz, resulting from enhanced magnetic loss and better matched characteristic impedance, rather than electric loss, as shown by the complex relative permeability μ_r = μ^′_r - j μ^″_r and permittivity ε{lunate}_r = ε{lunate}^′_r - j ε{lunate}^″_r. The microwave absorbing properties can be modulated simply by manipulating the thickness of the prepared Fe/Fe₃C-MWCNT composite for application in different frequency bands.

Original language	English
Pages (from-to)	556-560
Number of pages	5
Journal	Materials Chemistry and Physics
Volume	114
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2008.10.010
State	Published - 15 Apr 2009

Keywords

Carbon nanotubes
Iron oxide
Magnetic properties
TEM
X-ray diffraction

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10.1016/j.matchemphys.2008.10.010

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title = "A study of the magnetic and electromagnetic properties of γ-Fe2O3-multiwalled carbon nanotubes (MWCNT) and Fe/Fe3C-MWCNT composites",

abstract = "A ferromagnetic γ-Fe2O3-MWCNT composite was prepared by a reverse microemulsion technique, and was transformed to a Fe/Fe3C-MWCNT composite by further heat-treatment in H2 atmosphere at 950 °C. TEM result suggests that MWCNTs are both surface decorated and filled with γ-Fe2O3 or Fe/Fe3C nanoparticles. The saturation magnetization and anisotropy field are particularly strong for Fe/Fe3C-MWCNT. The reflection loss of Fe/Fe3C-MWCNT is better than that of γ-Fe2O3-MWCNT at all frequencies between 2 and 18 GHz, resulting from enhanced magnetic loss and better matched characteristic impedance, rather than electric loss, as shown by the complex relative permeability μr = μ′r - j μ″r and permittivity ε\{lunate\}r = ε\{lunate\}′r - j ε\{lunate\}″r. The microwave absorbing properties can be modulated simply by manipulating the thickness of the prepared Fe/Fe3C-MWCNT composite for application in different frequency bands.",

keywords = "Carbon nanotubes, Iron oxide, Magnetic properties, TEM, X-ray diffraction",

author = "P. Xu and Han, \{X. J.\} and Liu, \{X. R.\} and B. Zhang and C. Wang and Wang, \{X. H.\}",

year = "2009",

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doi = "10.1016/j.matchemphys.2008.10.010",

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T1 - A study of the magnetic and electromagnetic properties of γ-Fe2O3-multiwalled carbon nanotubes (MWCNT) and Fe/Fe3C-MWCNT composites

AU - Xu, P.

AU - Han, X. J.

AU - Liu, X. R.

AU - Zhang, B.

AU - Wang, C.

AU - Wang, X. H.

PY - 2009/4/15

Y1 - 2009/4/15

N2 - A ferromagnetic γ-Fe2O3-MWCNT composite was prepared by a reverse microemulsion technique, and was transformed to a Fe/Fe3C-MWCNT composite by further heat-treatment in H2 atmosphere at 950 °C. TEM result suggests that MWCNTs are both surface decorated and filled with γ-Fe2O3 or Fe/Fe3C nanoparticles. The saturation magnetization and anisotropy field are particularly strong for Fe/Fe3C-MWCNT. The reflection loss of Fe/Fe3C-MWCNT is better than that of γ-Fe2O3-MWCNT at all frequencies between 2 and 18 GHz, resulting from enhanced magnetic loss and better matched characteristic impedance, rather than electric loss, as shown by the complex relative permeability μr = μ′r - j μ″r and permittivity ε{lunate}r = ε{lunate}′r - j ε{lunate}″r. The microwave absorbing properties can be modulated simply by manipulating the thickness of the prepared Fe/Fe3C-MWCNT composite for application in different frequency bands.

AB - A ferromagnetic γ-Fe2O3-MWCNT composite was prepared by a reverse microemulsion technique, and was transformed to a Fe/Fe3C-MWCNT composite by further heat-treatment in H2 atmosphere at 950 °C. TEM result suggests that MWCNTs are both surface decorated and filled with γ-Fe2O3 or Fe/Fe3C nanoparticles. The saturation magnetization and anisotropy field are particularly strong for Fe/Fe3C-MWCNT. The reflection loss of Fe/Fe3C-MWCNT is better than that of γ-Fe2O3-MWCNT at all frequencies between 2 and 18 GHz, resulting from enhanced magnetic loss and better matched characteristic impedance, rather than electric loss, as shown by the complex relative permeability μr = μ′r - j μ″r and permittivity ε{lunate}r = ε{lunate}′r - j ε{lunate}″r. The microwave absorbing properties can be modulated simply by manipulating the thickness of the prepared Fe/Fe3C-MWCNT composite for application in different frequency bands.

KW - Carbon nanotubes

KW - Iron oxide

KW - Magnetic properties

KW - TEM

KW - X-ray diffraction

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U2 - 10.1016/j.matchemphys.2008.10.010

DO - 10.1016/j.matchemphys.2008.10.010

M3 - 文章

AN - SCOPUS:58849117965

SN - 0254-0584

VL - 114

SP - 556

EP - 560

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 2-3

ER -

A study of the magnetic and electromagnetic properties of γ-Fe₂O₃-multiwalled carbon nanotubes (MWCNT) and Fe/Fe₃C-MWCNT composites

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Keywords

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