Polyimide-based graphene composite foams with hierarchical impedance gradient for efficient electromagnetic absorption,Journal of Materials Chemistry C

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Polyimide-based graphene composite foams with hierarchical impedance gradient for efficient electromagnetic absorption
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-12-22 , DOI: 10.1039/d0tc04951d
Lei Pu _{1,

2,

3,

4,

5} , Shuangshuang Li _{1,

2,

3,

4,

5} , Yawei Zhang _{1,

2,

3,

4,

5} , Haiyan Zhu _{1,

2,

3,

4,

5} , Wei Fan _{6,

7,

8,

9,

10} , Piming Ma _{1,

2,

3,

4,

5} , Weifu Dong _{1,

2,

3,

4,

5} , Zicheng Wang _{1,

2,

3,

4,

5} , Tianxi Liu _{1,

2,

3,

4,

5}

Affiliation

The development of high-performance microwave absorption materials with strong absorption capacity and broad bandwidth is highly desirable in the field of electromagnetic pollution protection. Herein, polyimide/graphene composite foam with a multi-hierarchical impedance gradient structure has been precisely designed and controllably constructed by two-step vacuum impregnation, which effectively facilitates further attenuation of electromagnetic waves entering the graphene skeleton due to the generation of interfacial polarization relaxation and internal multiple reflection/scattering, thereby endowing it with excellent broadband microwave absorption performance. Meanwhile, the microwave absorption performance can be controllably adjusted by optimizing the impedance gradient of the skeleton. As a result, the optimized PI–GP–rGO composite foam exhibits a minimum reflection loss of −32.87 dB with an effective bandwidth of 6.22 GHz (8.26–14.48 GHz) at 10.39 GHz when the thickness is 4.0 mm.

中文翻译：

具有分层阻抗梯度的聚酰亚胺基石墨烯复合泡沫，可有效吸收电磁

在电磁污染防护领域，非常需要开发具有强吸收能力和宽带宽的高性能微波吸收材料。在此，通过两步真空浸渍，精确设计和控制了具有多层次阻抗梯度结构的聚酰亚胺/石墨烯复合泡沫，可有效地促进进入石墨烯骨架的电磁波的进一步衰减，这是由于产生了界面极化弛豫和内部多重反射/散射，从而使其具有出色的宽带微波吸收性能。同时，通过优化骨架的阻抗梯度，可控制地调节微波吸收性能。结果是，

更新日期：2021-01-19

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