材料科学
石墨烯
电磁屏蔽
复合材料
渗流阈值
热导率
电磁辐射
环氧树脂
电磁干扰
填料(材料)
热传导
复合数
电阻率和电导率
电子工程
纳米技术
电气工程
光学
工程类
物理
作者
Fariborz Kargar,Zahra Barani,Michael Balinskiy,Andres Sanchez Magana,Jacob Lewis,Alexander A. Balandin
标识
DOI:10.1002/aelm.201800558
摘要
We report on the synthesis and characterization of the epoxy-based composites with the few-layer graphene fillers, which are capable of the duel functional applications. It was found that composites with the certain types of few-layer graphene fillers reveal an efficient total electromagnetic interference shielding, SE~45 dB, in the important X-band frequency range, f=8.2 GHz - 12.4 GHz, while simultaneously providing the high thermal conductivity, K = 8 W/mK, which is a factor of x35 larger than that of the base matrix material. The efficiency of the dual functional application depends on the filler characteristics: thickness, lateral dimensions, aspect ratio and concentration. Graphene loading fractions above the percolation threshold allow for strong enhancement of both the electromagnetic interference shielding and heat conduction properties. Interestingly, graphene composites can block the electromagnetic energy even below the percolation threshold, remaining electrically insulating, which is an important feature for some types of thermal interface materials. The dual functionality of the graphene composites can substantially improve the electromagnetic shielding and thermal management of the airborne systems while simultaneously reducing their weight and cost.
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