Comparison of Electromagnetism Behavior of Different Content Cobalt-zinc Ferrite Loaded with Graphene

doi:10.15541/jim20180280

Abstract

Abstract:

A kind of graphene composite (rGO/Co_0.5Zn_0.5Fe₂O₄) was synthesized with the graphene oxide (GO) prepared from natural flake graphite and cobalt-zinc ferrite (Co_0.5Zn_0.5Fe₂O₄) manufactured by the hydrothermal method. The structure of composites was characterized by X-ray diffraction (XRD), Raman spectrometer (Raman) and the Fourier-transform infrared spectroscopy (FT-IR). Morphology, electromagnetic loss properties, Debye relaxation, and microwave absorbing properties of rGO/Co_0.5Zn_0.5Fe₂O₄ were investigated by transmission electron microscope (TEM) and vector network analyser (VNA). Sharp peak of graphene oxide was changed from 2θ=9.74° to 24.15° in the XRD patterns and the oxygen functional group disappeared after the composite reaction, which demonstrated that GO was successfully reduced to rGO. The graphene was embedded with cobalt-zinc ferrite, observed by transmission electron microscope, with its dispersion worse with the loaded Co_0.5Zn_0.5Fe₂O₄ increasing. Absorbing property of rGO/Co_0.5Zn_0.5Fe₂O₄ composite prepared with w(Co_0.5Zn_0.5Fe₂O₄) : w(GO)= 2 : 1 is the best with the minimum reflectivity of -36.89 dB at 15.11 GHz and the effective absorption frequency bandwidth of 3.74.

Key words: graphene, composite materials, cobalt-zinc ferrite, electromagnetic behavior, graphene oxide

CLC Number:

TM277
TQ127

Zhi-Jun MA, Chang-Ye MANG, Hai-Tao ZHAO, Zhi-Hao GUAN, Liang CHENG. Comparison of Electromagnetism Behavior of Different Content Cobalt-zinc Ferrite Loaded with Graphene[J]. Journal of Inorganic Materials, 2019, 34(4): 407-416.

Figures/Tables 9

Fig. 1 XRD patterns of natural flake graphite (a), GO (b), Co0.5Zn0.5Fe2O4 (c), and rGO/Co0.5Zn0.5Fe2O4 composite (d)

Table 1 Composition and structure parameters of ferrite

Structural formula	2θ/(°)	a/nm	(311) Priority crystallization diffraction peak
Structural formula	2θ/(°)	a/nm	FWHM/rad	Intensity/(a.u.)	Size/nm
Co_0.5Zn_0.5Fe₂O₄	35.597	0.8391	0.618	86	13.8
rGO/Co_0.5Zn_0.5Fe₂O₄	35.595	0.8358	0.466	94	17.7

Fig. 2 Raman spectra of natural flake graphite, GO (a) and Co0.5Zn0.5Fe2O4, rGO/Co0.5Zn0.5Fe2O4 composite (b)

Table 2 ID/IG ratios of natural flake graphite, GO and rGO/Co0.5Zn0.5Fe2O4 composite

Samples	Graphite	GO	rGO/Co_0.5Zn_0.5Fe₂O₄
I_D/I_G	0.21	0.95	1.02

Fig. 3 FT-IR spectra of natural flake graphite, GO (a), Co0.5Zn0.5Fe2O4 (b) and rGO/Co0.5Zn0.5Fe2O4 (c)

Fig. 4 TEM images of rGO/Co0.5Zn0.5Fe2O4-1(a), rGO/ Co0.5Zn0.5Fe2O4-2 (b), rGO/Co0.5Zn0.5Fe2O4-3 (c), and rGO/ Co0.5Zn0.5Fe2O4-4 (d)

Fig. 5 Real part of complex permittivity (a), imaginary part of complex permittivity (b), real part of complex permeability (c), imaginary part of complex permeability (d), dielectric loss tangent (e) and magnetic loss tangent (f) of GO、Co0.5Zn0.5Fe2O4 and rGO/Co0.5Zn0.5Fe2O4 composite with different ratios

Fig. 6 Real part of complex permittivity (ε°)-imaginary part of complex permittivity (ε?) curves of GO and rGO/Co0.5Zn0.5Fe2O4 composites with different ratios

Fig. 7 Curves of reflectivity and frequency of GO and rGO/Co0.5Zn0.5Fe2O4 composites with different ratios

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