Preparation and Electromagnetic Properties of CoFe2O4-Co3Fe7 Nanoparticles and CoFe2O4/Porous Carbon

doi:10.11901/1005.3093.2020.328

Chinese Journal of Materials Research

2021, Vol. 35

Issue (4): 302-312 DOI: 10.11901/1005.3093.2020.328

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Preparation and Electromagnetic Properties of CoFe₂O₄-Co₃Fe₇ Nanoparticles and CoFe₂O₄/Porous Carbon

LI Wanxi(

), DU Yi'en, GUO Fang, CHEN Yongqiang

Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China

Cite this article:

LI Wanxi, DU Yi'en, GUO Fang, CHEN Yongqiang. Preparation and Electromagnetic Properties of CoFe₂O₄-Co₃Fe₇ Nanoparticles and CoFe₂O₄/Porous Carbon. Chinese Journal of Materials Research, 2021, 35(4): 302-312.

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Abstract

CoFe₂O₄-Co₃Fe₇ nanoparticles were successfully prepared by reducing CoFe₂O₄ nanoparticles in 5% H₂ + 95% N₂. Meanwhile, CoFe₂O₄ nanoparticles were successfully loaded onto the porous carbon by hydrothermal method with the porous carbon fiber calcined from jute fiber as precursor. The prepared two composites were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectrometer, and simultaneous thermal analyzer (STA). Their electromagnetic parameters and microwave absorption performances were measured by vector network analyzer (VNA). The results show that the microwave absorption performances of CoFe₂O₄-Co₃Fe₇ nanoparticles and CoFe₂O₄/porous carbon are obviously better than that of the plain CoFe₂O₄ nanoparticles. The effective bandwidth (frequency width of reflection loss <-10 dB) of CoFe₂O₄-Co₃Fe₇ nanoparticles is 4.8 GHz, while that of CoFe₂O₄/porous carbon can reach 6 GHz, covering the entire Ku band (12~18 GHz). The excellent microwave absorption performance can be attributed to the appropriate dielectric constant, large dielectric loss, porous structure, and the synergistic effect of dielectric loss and magnetic loss. Owing to the characteristics of low cost, low density and good microwave absorption performance, the CoFe₂O₄/porous carbon has broad application prospect for Ku band as an economic, lightweight and broadband microwave absorbent.

Key words: composites microwave absorption performance hydrothermal method CoFe₂O₄ nanoparticles jute fiber CoFe₂O₄/porous carbon

Received: 07 August 2020

ZTFLH:

TB332

Fund: the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2019L0883);the Shanxi “1331 Project” Key Innovative Research Team(PY201817);the Jinzhong University “1331 Project” Key Innovative Research Team(jzxycxtd2019005)

About author: LI Wanxi, Tel: 13613410452, E-mail: liwanxi1986@163.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.328 OR https://www.cjmr.org/EN/Y2021/V35/I4/302

Fig.1 XRD patterns of as-synthesized samples (a) CF, (b) CF500, and (c) CF600

Fig.2 SEM and TEM images of CF (a, b), CF500 (c, d), and CF600 (e, f)

Fig.3 Frequency dependence of the reflection loss of paraffin in which content of CF (a), CF500 (b), and CF600 (c) is 75%

Fig.4 Frequency dependence of complex permittivity (a), complex permeability (b), and loss factor (c) of paraffin in which content of CF, CF500, and CF600 is 75%

Fig.5 Characteristic impedance (a) and attenuation constant (b) of paraffin in which content of CF, CF500, and CF600 is 75%

Fig.6 Frequency dependence of the reflection loss of paraffin in which content of CF500 (a) and CF600 (b) is 50%

Fig.7 Frequency dependence of complex permittivity (a), complex permeability (b), loss factor (c), Cole-Cole curves (ε′ versus ε") (d~e), and C₀ values (f) of paraffin in which content of CF500 and CF600 is 50%

Fig.8 XRD pattern (a) and Raman spectra (b) of CoFe₂O₄/porous carbon

Fig.9 SEM images (a, b and c) of porous carbon loaded with CoFe₂O₄ nanoparticles and TEM image (d) of CoFe₂O₄ nanoparticles in CoFe₂O₄/porous carbon

Fig.10 TG curve of CoFe₂O₄/porous carbon in air atmosphere

Fig.11 Frequency dependence of reflection loss (a), complex permittivity (b), complex permeability (c), and loss factor (d) of CoFe₂O₄/porous carbon with 40% sample in paraffin

Table 1 Microwave absorption performances of some reported absorbents

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