h-BN–GO–Fe 3 O 4三元复合物的优异微波吸收性能,Journal of Materials Chemistry C

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h-BN–GO–Fe ₃ O ₄三元复合物的优异微波吸收性能
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-10-09 , DOI: 10.1039/c8tc03582b
Hua Pang _{1,

2,

3,

4} , Wenhui Pang _{1,

2,

3,

4} , Bo Zhang _{3,

4,

5} , Nan Ren _{3,

4,

5}

Affiliation

通过一种简便有效的策略，合成了六方氮化硼纳米板-氧化石墨烯-Fe ₃ O ₄微板（h-BN-GO-Fe ₃ O ₄）的三元复合材料，作为新型的电磁（EM）微波吸收材料。该复合材料具有带层间空隙的层状微结构。GO层和h-BN纳米板可以显着减少Fe ₃ O ₄微板的聚集，从而降低电导率。重叠的Fe ₃ O ₄微板和嵌入的h-BN纳米板会产生空隙，从而进一步增加材料的电阻率并有效地抑制涡流。分层的多组分结构有利于改善阻抗匹配，并具有出色的EM微波吸收性能。当吸收体厚度在2.0至5.0 mm范围内时，可实现12.2 GHz的有效吸收带宽（RL <-10 dB）。利用复杂的厚度模型和四分之一波长抵消理论讨论了复合材料的电磁波吸收机理。结果发现，卓越的微波吸收性能可以归因于入射-反射电磁波在空气-材料界面处的界面抵消和微波的耗散共同产生的结果。通过磁损耗，多次反射和材料中的散射。这项研究表明，含空隙的复合材料是制造宽带和高效EM微波吸收器的有效方法。

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Excellent microwave absorption properties of the h-BN–GO–Fe3O4 ternary composite

A ternary composite of hexagonal boron nitride nanoplates–graphene oxide–Fe₃O₄ microplates (h-BN–GO–Fe₃O₄) as a novel type of electromagnetic (EM) microwave absorbing material was synthesized via a facile and efficient strategy. The composite has a layered microstructure with interlayer voids. The GO layers and h-BN nanoplates can significantly reduce the aggregation of the Fe₃O₄ microplates to reduce conductivity. The overlapped Fe₃O₄ microplates and the embedded h-BN nanoplates result in voids which further increase the resistivity of the material and suppress eddy current effectively. The hierarchically multicomponent structure is in favor of improving the impedance matching and results in excellent EM microwave absorbing performance. An effective absorption bandwidth (RL < −10 dB) of 12.2 GHz is achieved when the absorber thicknesses range from 2.0 to 5.0 mm. The EM microwave absorption mechanism of the composite is discussed using a complex thickness model and the quarter-wavelength cancellation theory. It is found that the remarkable microwave absorption performances can be ascribed to the joint outcome of the interfacial cancellation of the incident and reflected EM microwaves at the air–material interface and the dissipation of the microwaves via magnetic loss, multiple reflections and scattering in the material. This research demonstrates void containing composites as an efficient approach for fabricating broad-bandwidth and efficient EM microwave absorbers.

更新日期：2018-11-08

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