石墨烯复合材料作为极高频电磁波吸收材料的研究
Graphene Composites as Efficient Electromagnetic Absorbers in the Extremely High Frequency Band
摘要：
我们报告的合成的环氧基复合材料与石墨烯填料和测试其电磁屏蔽效率的准光学自由空间法在极高频（EHF）频段（220 - 325 GHz）。固化粘合剂复合材料通过可扩展的技术生产，具有几微米横向尺寸的单层和几层石墨烯层的混合物。发现即使在石墨烯填料的低浓度下电磁透射率T也低：对于仅具有1重量%石墨烯的复合材料，在300 GHz的频率下T <1%。在具有低石墨烯负载的复合材料中的主要屏蔽机制是吸收。厚度为1 mm且石墨烯负载量为8 wt %的复合材料在亚太赫兹EHF频率下提供了70 dB的优异电磁屏蔽，对环境的能量反射可忽略不计。所开发的具有石墨烯填料的轻质粘合剂复合材料可用作高频微波无线电继电器、微波遥感器、毫米波扫描仪和无线局域网中的电磁吸收剂。
英文摘要：
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.
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