三维石墨烯/碳纳米管/碳化硅共增强复合材料的电磁屏蔽和导热性能

Co-enhancement of electromagnetic shielding and thermal conductive properties of three-dimensional graphene/CNT/SiC composites

  • 摘要: 在电子设备运行期间,会发出大量的热量和电磁辐射。因此,研究具有电磁屏蔽和热管理能力的双功能材料就至关重要了。为此,本文合成了三维石墨烯/CNT/CiC(3D石墨烯/CNT/SiC)的双功能复合材料。利用液相还原法制备了一种用于自组装的三维多孔氧化石墨烯结构。碳化硅晶须散布在三维石墨烯各层之间,作为纵向热传导框架。同时,碳纳米管(碳纳米管)粘附在碳化硅的表面,形成一个叶状结构。这促进了碳化硅晶须和石墨烯层之间的键合,增强了非均匀界面,进一步提高了介电损失和导热率。该复合材料在加入2%的碳化硅后,其导热系数为123 Wm−1K−1,屏蔽效率为29.3 dB。这些结果表明,三维石墨烯/碳纳米管/SiC具有良好的导热性和电磁屏蔽性能。

     

    Abstract: Significant heat and electromagnetic radiation emitted during the operation of electronic devices drives the researches on the dual-functional materials with electromagnetic shielding and thermal management capabilities. Herein, the one-dimensional (1D) SiC whiskers and carbon nanotubes (CNTs) are combined with two-dimensional (2D) graphene to synthesize the three-dimensional (3D) dual-functional composites of graphene/CNT/SiC. A 3D porous graphene structure is fabricated using a liquid-phase reduction method via the self-assembly of graphene oxide, where CNTs are dispersed on the graphene layers and SiC whiskers are interspersed between the porous matrix. Simultaneously, a leaf-like structure is built by adhering the skeleton of CNTs and whiskers on the surface of graphene, which promotes the bonding between SiC whiskers and graphene layers by CNTs. The 3D structure of graphene/CNT/SiC improves the heterogeneous interfaces and the dual-functional characteristics are enhanced by exhibiting the thermal conductivity of 123 W·m–1·K–1 and shielding effectiveness of 29.3 dB with 2% SiC addition.

     

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