Largely enhanced thermal conductivity of graphene/copper composites with highly aligned graphene network
Largely enhanced thermal conductivity of graphene/copper composites with highly aligned graphene network
复制标题
具有高度排列的石墨烯网络的石墨烯/铜复合材料的导热性大大增强
DOI：
10.1016/j.carbon.2017.10.099
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发表时间：
2018-02-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Hu
中科院分区：
文献类型：
--
作者：
Chu, Ke;Wang, Xiao-hu;Zhang, Hu
石墨烯沿着其盆平面具有超高热导率（TC）。然而，石墨烯/金属复合材料的TC仍然远低于预期，主要是由于金属基质中缺乏足够的石墨烯排列。在此，我们报道了一种有效的路线，制备石墨烯纳米片（GNP）/铜复合材料与高度对齐的GNP通过真空过滤的方法，然后放电等离子体烧结。令人印象深刻的是，当GNP分数达到35体积%时，在Cu基质内建立了长程和高度对齐的GNP网络，导致525 W/mK的令人惊讶的高面内TC，其比Cu基质的高50%，并且是对于块状石墨烯/金属复合材料所报道的最高值之一。这些结果表明，我们构建高度对齐的石墨烯网络的策略确实可以在石墨烯/金属复合材料中实现显着的面内TC增强，并且所得复合材料可以在需要高效定向传热的电子封装中找到应用。(C)2017爱思唯尔有限公司版权所有
Graphene has an ultra-high thermal conductivity (TC) along its basin plane. However, the TC of graphene/metal composites is still far below the expectation due primarily to the lack of sufficient graphene alignment in the metal matrix. Herein, we reported an efficient route to prepare the graphene nanoplatelet (GNP)/Cu composites with highly aligned GNPs by a vacuum filtration method followed by spark plasma sintering. Impressively, when the GNP fraction reached 35 vol%, a long-range and highly aligned GNP network was established within the Cu matrix, leading to a surprisingly high in-plane TC of 525 W/mK, which was 50% higher than that of Cu matrix and among the highest value ever reported for bulk graphene/metal composites. These results demonstrated that our strategy to construct a highly aligned graphene network could indeed achieve the remarkable in-plane TC enhancement in graphene/metal composites, and resulting composites may find application in electronic packaging that requires efficient directional heat transfer. (C) 2017 Elsevier Ltd. All rights reserved.