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Controllable permittivity in 3D Fe3O4/CNTs network for remarkable microwave absorption performances

机译:3D Fe 3 O 4 / CNTs网络中可控制的介电常数,具有出色的微波吸收性能

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Carbon-based magnetic composites are promising alternatives to pure magnetic nanoparticles (MOx, M = Fe, Co, Ni) and spinel ferrites (MFe2O4, M = Fe, Co, Ni, Mn, Zn) as electromagnetic (EM) wave absorption materials, which however suffer from complex processes and have poor microwave absorption properties. Herein, we anchored Fe3O4 porous spheres onto carbon nanotubes (CNTs) via a simple solvothermal method. The formed Fe3O4/CNTs nanocomposites show a three-dimension (3D) network. The improved effective bandwidth (3.9 GHz) and, more importantly, remarkable EM microwave absorption performances (?51 dB at 5.52 GHz) are observed in 3D Fe3O4/5 wt% CNTs nanocomposites. The enhanced microwave absorption performances are attributed to the high surface areas and porous structure of magnetic Fe3O4 spheres, which presented a good synergetic role with CNTs. Furthermore, the controllable permittivity in nanocomposites was developed by adjusting the CNT content, which balanced the permeability to obtain a good impedance matching. This work demonstrates a simple approach to enhancing the microwave absorption performances of EM wave absorption materials.
机译:碳基磁性复合材料是纯磁性纳米粒子(MO x ,M = Fe,Co,Ni)和尖晶石铁氧体(MFe 2 O 4 ,M = Fe,Co,Ni,Mn,Zn)为电磁波吸收材料,但是其工艺复杂且微波吸收性能差。在这里,我们将Fe 3 O 4 多孔球锚定在碳纳米管(ems)上,通过em>一种简单的溶剂热方法。形成的Fe 3 O 4 / CNTs纳米复合材料表现出三维(3D)网络。在3D Fe 3 O 中观察到提高的有效带宽(3.9 GHz),更重要的是,显着提高了EM微波吸收性能(在5.52 GHz时?51 dB) 4 / 5 wt%CNTs纳米复合材料。增强的微波吸收性能归因于磁性Fe 3 O 4 球的高表面积和多孔结构,与CNT具有良好的协同作用。此外,通过调节CNT的含量来开发纳米复合材料的可控介电常数,从而平衡了导磁率以获得良好的阻抗匹配。这项工作演示了一种简单的方法来增强EM波吸收材料的微波吸收性能。

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