论文标题
石墨烯复合材料作为极高频带中的有效电磁吸收器
Graphene Composites as Efficient Electromagnetic Absorbers in the Extremely High Frequency Band
论文作者
论文摘要
我们报告了基于石墨烯填充剂的基于环氧树脂的复合材料的合成，并以极高的频率（EHF）频段（220-325 GHz）以准仪的自由空间方法测试其电磁屏蔽效率。固化粘合剂复合材料是通过可伸缩技术生产的，具有几种微调横向尺寸的单层和几层石墨烯层的混合物。已经发现，即使在少量的石墨烯填充剂下，电磁透射率也很低：对于仅1 wt％石墨烯的复合材料，在300 GHz的频率下t <1％。低石墨烯载荷的复合材料中的主要屏蔽机制是吸收。 1毫米厚度和8 wt％的石墨烯加载的复合材料在亚terahertz EHF频率中提供了70 dB的出色电磁屏蔽，并且能量反射可忽略不计。带有石墨烯填充剂的开发的轻质粘合剂复合材料可以用作高频微波无线电继电器，微波遥控传感器，毫米波扫描仪和无线局部区域网络中的电磁吸收器。
We report on the synthesis of the epoxy-based composites with graphene fillers and testing their electromagnetic shielding efficiency by the quasi-optic free-space method in the extremely high frequency (EHF) band (220 - 325 GHz). The curing adhesive composites were produced by a scalable technique with a mixture of single-layer and few-layer graphene layers of a few-micron lateral dimensions. It was found that the electromagnetic transmission, T, is low even at small concentrations of graphene fillers: T<1% at frequency of 300 GHz for a composite with only 1 wt% of graphene. The main shielding mechanism in composites with the low graphene loading is absorption. The composites of 1 mm thickness and graphene loading of 8 wt% provide excellent electromagnetic shielding of 70 dB in the sub-terahertz EHF frequency with negligible energy reflection to the environment. The developed lightweight adhesive composites with graphene fillers can be used as electromagnetic absorbers in the high-frequency microwave radio relays, microwave remote sensors, millimeter wave scanners, and wireless local area networks.
