Abstract 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.

中文翻译：

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具有高度对齐的石墨烯网络的石墨烯/铜复合材料的热导率大大提高

摘要 石墨烯沿其盆地平面具有超高热导率（TC）。然而，石墨烯/金属复合材料的 TC 仍远低于预期，主要是由于金属基体中缺乏足够的石墨烯排列。在此，我们报道了一种通过真空过滤法和放电等离子体烧结制备具有高度排列的 GNP 的石墨烯纳米片 (GNP)/Cu 复合材料的有效途径。令人印象深刻的是，当 GNP 比例达到 35 vol% 时，在 Cu 基质内建立了一个长程且高度对齐的 GNP 网络，导致面内 TC 惊人地高至 525 W/mK，比铜基体，是迄今为止报道的块状石墨烯/金属复合材料的最高值之​​一。