ABSTRACT

A novel gradient graphene composite composed of three-layers was fabricated by fused deposition modelling (FDM) with graphene oxide (RGO)/polylactic acid (PLA) as the printing filaments. Based on the analysis of the electromagnetic parameters of samples with different graphene contents, the thickness range of each functional layer was determined by the reflection loss model. The results show that when 5 wt%, 7 wt% and 8 wt% of graphene contents were selected as the three functional layers, the gradient structure absorber has better electromagnetic absorption effect than the homogeneous absorber. The sample achieving −8 dB broadband absorption in the X and Ku bands and a maximum absorption peak of −30 dB at 17 GHz for a 4 mm-thick composite absorber. The excellent microwave absorption ability could be attributed to the gradient distribution of graphene composites, which proper impedance matching, the substantial dielectric loss in graphene, the interfacial void, interfacial polarization loss.

摘要

以氧化石墨烯（RGO）/聚乳酸（PLA）为打印丝，通过熔融沉积成型（FDM）制备了一种由三层组成的新型梯度石墨烯复合材料。在分析不同石墨烯含量样品的电磁参数的基础上，通过反射损耗模型确定了各功能层的厚度范围。The results show that when 5 wt%, 7 wt% and 8 wt% of graphene contents were selected as the three functional layers, the gradient structure absorber has better electromagnetic absorption effect than the homogeneous absorber. 对于 4 mm 厚的复合吸收器，样品在 X 和 Ku 波段实现 -8 dB 宽带吸收，在 17 GHz 处的最大吸收峰为 -30 dB。