Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong.
Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, China.
Nano Lett. 2016 Jun 8;16(6):3585-93. doi: 10.1021/acs.nanolett.6b00722. Epub 2016 May 6.
The effects of number of graphene layers (n) and size of multilayer graphene sheets on thermal conductivities (TCs) of their epoxy composites are investigated. Molecular dynamics simulations show that the in-plane TCs of graphene sheets and the TCs across the graphene/epoxy interface simultaneously increase with increasing n. However, such higher TCs of multilayer graphene sheets will not translate into higher TCs of bulk composites unless they have large lateral sizes to maintain their aspect ratios comparable to the monolayer counterparts. The benefits of using large, multilayer graphene sheets are confirmed by experiments, showing that the composites made from graphite nanoplatelets (n > 10) with over 30 μm in diameter deliver a TC of ∼1.5 W m(-1) K(-1) at only 2.8 vol %, consistently higher than those containing monolayer or few-layer graphene at the same graphene loading. Our findings offer a guideline to use cost-effective multilayer graphene as conductive fillers for various thermal management applications.
研究了石墨烯层数（n）和多层石墨烯片尺寸对其环氧树脂复合材料热导率（TC）的影响。分子动力学模拟表明，石墨烯片的面内热导率和石墨烯/环氧树脂界面的热导率随 n 的增加而同时增加。然而，除非多层石墨烯片具有较大的横向尺寸以保持与其单层对应物相当的纵横比，否则它们较高的 TCs 不会转化为较高的整体复合材料 TCs。实验证实了使用大尺寸多层石墨烯片的优势，结果表明，由直径超过 30 μm 的石墨纳米片（n > 10）制成的复合材料在仅 2.8 vol%的填充量下即可达到约 1.5 W m(-1) K(-1)的 TCs，明显高于相同石墨烯负载量下的含有单层或少数层石墨烯的复合材料。我们的研究结果为使用具有成本效益的多层石墨烯作为各种热管理应用的导电填料提供了指导。
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