原位制备核壳结构CoFe<sub>2</sub>O<sub>4</sub>@多孔碳球吸波性能研究

任良贵; 王益群; 张欣; 何秦川; 吴广磊

doi:10.1007/s12613-022-2509-1

Volume 30 Issue 3

Mar. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(3): 504-514

Lianggui Ren, Yiqun Wang, Xin Zhang, Qinchuan He, and Guanglei Wu, Efficient microwave absorption achieved through in situ construction of core–shell CoFe₂O₄@mesoporous carbon hollow spheres, Int. J. Miner. Metall. Mater., 30(2023), No. 3, pp. 504-514. https://doi.org/10.1007/s12613-022-2509-1

Cite this article as:

Lianggui Ren, Yiqun Wang, Xin Zhang, Qinchuan He, and Guanglei Wu, Efficient microwave absorption achieved through in situ construction of core–shell CoFe2O4@mesoporous carbon hollow spheres, Int. J. Miner. Metall. Mater., 30(2023), No. 3, pp. 504-514. https://doi.org/10.1007/s12613-022-2509-1

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研究论文

原位制备核壳结构CoFe₂O₄@多孔碳球吸波性能研究

1)
成都理工大学材料与化学化工学院, 成都 610059, 中国
2)
青岛大学材料科学与工程学院, 生物纤维与生态纺织品国家重点实验室, 能源与环境材料研究所, 青岛 266071, 中国

通讯作者:
王益群 E-mail: wangyiqun17@cdut.edu.cn

吴广磊 E-mail: wuguanglei@qdu.edu.cn

文章亮点

(1) 原位制备了CoFe₂O₄@多孔碳球并研究了多孔球孔径的调节规律。

(2) 系统地研究了CoFe₂O₄含量对多孔微球微波吸收的影响规律。

(3) 总结并提出了CoFe₂O₄@多孔碳球吸波性能优异的机理。

中文摘要

CoFe₂O₄具有良好的化学稳定性和磁损耗，可用于制备具有独特结构的电磁波吸收复合材料。在本研究中，通过原位制备将CoFe₂O₄磁性粒子引入中空多孔碳中，制备了具有核壳结构的CoFe₂O₄@碳空心球。本文研究了微观组织与电磁波吸收性能的关系。研究结果表明：通过构建多孔结构并调整多孔碳和CoFe₂O₄的比例，可以有效地协调磁损耗和介电损耗。CoFe₂O₄@多孔碳复合材料的最小吸收在5.8 GHz时达到−29.7 dB。此外，有效吸收带宽为3.7 GHz在厚度为2.5 mm。复合材料的微波吸收性能的提升是由于在材料引入多孔核壳结构和CoFe₂O₄磁性粒子。多孔结构与核壳结构之间的协调有利于提高复合材料衰减系数，并实现良好的阻抗匹配。同时，多孔核–壳结构增强了电磁波在多次散射和反射；并提供了大的固体–空界面和CoFe₂O₄–碳界面来诱导界面极化，增强电磁波极化损耗。此外，CoFe₂O₄磁性粒子的引入增强了自然共振、交换共振和涡流损耗的磁损耗。

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Research Article

Efficient microwave absorption achieved through in situ construction of core–shell CoFe₂O₄@mesoporous carbon hollow spheres

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Abstract

Abstract

Cobalt ferrite (CoFe₂O₄), with good chemical stability and magnetic loss, can be used to prepare composites with a unique structure and high absorption. In this study, CoFe₂O₄@mesoporous carbon hollow spheres (MCHS) with a core–shell structure were prepared by introducing CoFe₂O₄ magnetic particles into hollow mesoporous carbon through a simple in situ method. Then, the microwave absorption performance of the CoFe₂O₄@MCHS composites was investigated. Magnetic and dielectric losses can be effectively coordinated by constructing the porous structure and adjusting the ratio of MCHS and CoFe₂O₄. Results show that the impedance matching and absorption properties of the CoFe₂O₄@MCHS composites can be altered by tweaking the mass ratio of MCHS and CoFe₂O₄. The minimum reflection loss of the CoFe₂O₄@MCHS composites reaches −29.7 dB at 5.8 GHz. In addition, the effective absorption bandwidth is 3.7 GHz, with the thickness being 2.5 mm. The boosted microwave absorption can be ascribed to the porous core–shell structure and introduction of magnetic particles. The coordination between the microporous morphology and the core–shell structure is conducive to improving the attenuation coefficient and achieving good impedance matching. The porous core–shell structure provides large solid–void and CoFe₂O₄–C interfaces to induce interfacial polarization and extend the electromagnetic waves’ multiple scattering and reflection. Furthermore, natural resonance, exchange resonance, and eddy current loss work together for the magnetic loss. This method provides a practical solution to prepare core–shell structure microwave absorbents.
- porous core–shell structure;
- microwave absorption;
- interface polarization;
- ferrite;
- structure-controllable

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原位制备核壳结构CoFe₂O₄@多孔碳球吸波性能研究

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Efficient microwave absorption achieved through in situ construction of core–shell CoFe₂O₄@mesoporous carbon hollow spheres

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原位制备核壳结构CoFe2O4@多孔碳球吸波性能研究

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Efficient microwave absorption achieved through in situ construction of core–shell CoFe2O4@mesoporous carbon hollow spheres

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原位制备核壳结构CoFe₂O₄@多孔碳球吸波性能研究

Efficient microwave absorption achieved through in situ construction of core–shell CoFe₂O₄@mesoporous carbon hollow spheres