SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 47 ›› Issue (7): 206-217.DOI: 10.1016/j.cjche.2021.07.006

Previous Articles     Next Articles

Synthesis of carbon-coated cobalt ferrite core–shell structure composite: A method for enhancing electromagnetic wave absorption properties by adjusting impedance matching

Jing Gao1, Zhijun Ma1, Fuli Liu2, Cunxin Chen1   

  1. 1. School of Mining, Liaoning Technical University, Fuxin 123000, China;
    2. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
  • Received:2021-05-26 Revised:2021-07-08 Online:2022-08-19 Published:2022-07-28
  • Contact: Zhijun Ma,E-mail:mazhijun@lntu.edu.cn
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (51372108).

Synthesis of carbon-coated cobalt ferrite core–shell structure composite: A method for enhancing electromagnetic wave absorption properties by adjusting impedance matching

Jing Gao1, Zhijun Ma1, Fuli Liu2, Cunxin Chen1   

  1. 1. School of Mining, Liaoning Technical University, Fuxin 123000, China;
    2. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
  • 通讯作者: Zhijun Ma,E-mail:mazhijun@lntu.edu.cn
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (51372108).

Abstract: Cobalt ferrite has problems such as poor impedance matching and high density, which results in unsatisfactory electromagnetic wave (EMW) absorption performance. In this study, the CoFe2O4@C core-shell structure composite was synthesized by a two-step hydrothermal method. X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and vector network analysis et al. were used to test the structure and EMW absorption properties of CoFe2O4@C composite. The results show that the reflection loss (RL) of the CoFe2O4@C composite reaches the maximum value of -25.66 dB at 13.92 GHz, and the effective absorbing band (EAB) is 4.59 GHz (11.20-15.79 GHz) when the carbon mass content is 6.01%. The RL and EAB of CoFe2O4@C composite are increased by 219.55% and 4.59 GHz respectively, and the density is decreased by 20.78% compared with the cobalt ferrite. Such enhanced EMW absorption properties of CoFe2O4@C composite are attributed to the attenuation caused by the strong natural resonance of the cobalt ferrite, moreover, the carbon coating layer adjusts the impedance matching of the composite, and the introduced dipole polarization and interface polarization can cause multiple Debye relaxation processes.

Key words: Cobalt ferrite, Core-shell structure composite, Electromagnetic wave absorption, Impedance matching

摘要: Cobalt ferrite has problems such as poor impedance matching and high density, which results in unsatisfactory electromagnetic wave (EMW) absorption performance. In this study, the CoFe2O4@C core-shell structure composite was synthesized by a two-step hydrothermal method. X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and vector network analysis et al. were used to test the structure and EMW absorption properties of CoFe2O4@C composite. The results show that the reflection loss (RL) of the CoFe2O4@C composite reaches the maximum value of -25.66 dB at 13.92 GHz, and the effective absorbing band (EAB) is 4.59 GHz (11.20-15.79 GHz) when the carbon mass content is 6.01%. The RL and EAB of CoFe2O4@C composite are increased by 219.55% and 4.59 GHz respectively, and the density is decreased by 20.78% compared with the cobalt ferrite. Such enhanced EMW absorption properties of CoFe2O4@C composite are attributed to the attenuation caused by the strong natural resonance of the cobalt ferrite, moreover, the carbon coating layer adjusts the impedance matching of the composite, and the introduced dipole polarization and interface polarization can cause multiple Debye relaxation processes.

关键词: Cobalt ferrite, Core-shell structure composite, Electromagnetic wave absorption, Impedance matching