Preparation and Microwave Absorption Properties of CoFe2O4-graphene Nanocomposites

doi:10.15541/jim20130588

Abstract

Abstract:

CoFe₂O₄-graphene (CFO-GN) nanocomposites were synthesized by in situ co-precipitation method, involving homogeneous co-precipitation of Co²⁺and Fe²⁺ on the surface of graphite oxides and in situ thermal reduction of graphite oxides simultaneously. The morphology, structure, composition and microwave absorption properties of the nanocomposites were characterized and analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscope (EDS), thermogravimetric analyzer (TGA), Fourier transform infrared spectroscope (FT-IR) and vector network analyzer (VNA). The results indicate that the CoFe₂O₄ nanoparticles are uniformly dispersed on the interlayer and surface of the graphene sheets, CoFe₂O₄-graphene nanocomposites possess dielectric loss and magnetic loss, and exhibit excellent microwave absorption properties. The reflection losses of the nanocomposites with 88.62wt% and 74.53wt% CoFe₂O₄ are up to -11.0 dB and -12.4 dB, respectively, the bandwidths of reflection loss below -8 dB are 2.0 GHz and 4.3 GHz, respectively. The nanocomposites with higher content of graphene exhibit higher dielectric loss and reflection loss, wider absorption band, and thus exhibit better microwave absorption properties.

Key words: graphene, cobalt ferrite, nanocomposite, microwave absorption

CLC Number:

TB332
TM25

WU Xiao-Yu, LI Song-Mei,LIU Jian-Hua, YU Mei, WANG Bo. Preparation and Microwave Absorption Properties of CoFe₂O₄-graphene Nanocomposites[J]. Journal of Inorganic Materials, 2014, 29(8): 845-850.

Figures/Tables 6

Fig. 1 XRD patterns of the GO and the CoFe2O4-graphene nanocomposites (a)GO; (b) CFO-GN-1; (c) CFO-GN-2

Fig. 2 SEM (a, b) and TEM (c, d) images of the CoFe2O4- graphene nanocomposites (a, c) CFO-GN-1; (b, d) CFO-GN-2; Inset in (d) is the corresponding HRTEM image of CFO-GN-2

Fig. 3 (a) EDS spectrum and (b) TGA curves of the CoFe2O4-graphene nanocomposites

Fig. 4 FT-IR spectra of the GO and the CoFe2O4-graphene nanocomposites (a) GO; (b) CFO-GN-1; (c) CFO-GN-2

Fig. 5 Relation curves of dielectric and magnetic loss tangent vs frequency of the CoFe2O4-graphene nanocomposites (a) Dielectric loss tangent ; (b) Magnetic loss tangent

References 29

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Preparation and Microwave Absorption Properties of CoFe₂O₄-graphene Nanocomposites

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