Apium-derived biochar loaded with MnFe2O4@C for excellent low frequency electromagnetic wave absorption
Apium-derived biochar loaded with MnFe2O4@C for excellent low frequency electromagnetic wave absorption
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源自芹菜的生物炭负载 MnFe2O4@C，具有出色的低频电磁波吸收能力
DOI：
10.1016/j.ceramint.2020.02.150
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发表时间：
2020-06
影响因子：
5.2
通讯作者：
Tang Yuting
中科院分区：
文献类型：
--
作者：
Yin Pengfei;Zhang Limin;Sun Ping;Wang Jian;Feng Xing;Zhang Yi;Dai Jianwu;Tang Yuting
随着电子通信和雷达探测技术的迅速发展，低频电磁波材料越来越受到人们的关注。本文采用共溶剂热煅烧法成功制备了负载MnFe2O4@C的生物炭。MnFe_2O_4纳米颗粒表面的包覆碳层是由生物炭通过热扩散迁移而来的，同时生物炭表面也被铁氧体纳米颗粒所包覆。因此，介电损耗和磁损耗的组合赋予复合材料优异的低频电磁吸收能力，即在0.78 GHz处的最佳微波吸收强度为-48.92 dB，仅2.5 mm厚度的扩展的有效吸收带宽为0.38-1.78 GHz，归因于自然共振、多界面和表面极化，具有较强电磁衰减能力和良好的阻抗匹配特性。这种生物基铁氧体复合材料具有性能优异、重量轻、环保、易降解等优点，在制备磁性金属材料方面具有很大的潜力。
Given the rapid development of electrommunication and radar detection technologies, low frequency electromagnetic wave materials have received more and more attention. Herein, the Apium-derived biochar loaded with MnFe2O4@C has been successfully prepared by using co-solvothermal and calcination method. The cladding carbon layer on MnFe2O4NPs is migrated from biochar via thermal diffusion, and the biochar is covered with the ferrite NPs as well. Thus, the combination of dielectric and magnetic loss endows the composite with excellent low frequency electromagnetic absorption ability i.e. the optimal microwave absorbing intensity is −48.92 dB at 0.78 GHz with an extended effective absorbing bandwidth of 0.38–1.78 GHz for only 2.5 mm thickness, being ascribed to nature resonance, multiple interfacial and surface polarization, strong electromagnetic attenuation ability and good impedance matching property in detail. This bio-based ferrite composites have great potential in preparation of MAMs due to the advantages of extraordinary performance, lightweight property, environmental protection and easy degradation.
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