Hou Zhi-Ling, Song Wei-Li, Wang Ping, Meziani Mohammed J, Kong Chang Yi, Anderson Ankoma, Maimaiti Halidan, LeCroy Gregory E, Qian Haijun, Sun Ya-Ping
Department of Chemistry and Laboratory for Emerging Materials and Technology, Clemson University , Clemson, South Carolina 29634-0973, United States.
ACS Appl Mater Interfaces. 2014 Sep 10;6(17):15026-32. doi: 10.1021/am502986j. Epub 2014 Aug 21.
Graphene is known for high thermal and electrical conductivities. In the preparation of neat carbon materials based on graphene, a common approach has been the use of well-exfoliated graphene oxides (GOs) as the precursor, followed by conversion to reduced GOs (rGOs). However, rGOs are more suitable for the targeted high electrical conductivity achievable through percolation but considerably less effective in terms of efficient thermal transport dictated by phonon progression. In this work, neat carbon films were fabricated directly from few-layer graphene sheets, avoiding rGOs completely. These essentially graphene-graphene composites were of a metal-like appearance and mechanically flexible, exhibiting superior thermal and electrical transport properties. The observed thermal and electrical conductivities are higher than 220 W/m · K and 85000 S/m, respectively. Some issues in the further development of these mechanically flexible graphene-graphene nanocomposite materials are discussed and so are the associated opportunities.
石墨烯以其高导热性和导电性而闻名。在制备基于石墨烯的纯碳材料时，一种常见的方法是使用充分剥离的氧化石墨烯（GOs）作为前驱体，随后将其转化为还原氧化石墨烯（rGOs）。然而，rGOs更适合通过渗滤实现目标高电导率，但在由声子进展决定的高效热传输方面效果要差得多。在这项工作中，直接由少层石墨烯片制备了纯碳膜，完全避免了rGOs。这些本质上是石墨烯-石墨烯复合材料，具有类似金属的外观且机械柔韧性好，表现出优异的热传输和电传输性能。观察到的热导率和电导率分别高于220W/m·K和85000S/m。讨论了这些机械柔韧性好的石墨烯-石墨烯纳米复合材料进一步发展中的一些问题以及相关机遇。
