1] World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba 3050044, Japan [2] Department of Nano-Science and Nano-Engineering, Faculty of Science and Engineering, Waseda University, Tokyo 1698555, Japan.
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
Nat Commun. 2013;4:2905. doi: 10.1038/ncomms3905.
Three-dimensional graphene architectures in the macroworld can in principle maintain all the extraordinary nanoscale properties of individual graphene flakes. However, current 3D graphene products suffer from poor electrical conductivity, low surface area and insufficient mechanical strength/elasticity; the interconnected self-supported reproducible 3D graphenes remain unavailable. Here we report a sugar-blowing approach based on a polymeric predecessor to synthesize a 3D graphene bubble network. The bubble network consists of mono- or few-layered graphitic membranes that are tightly glued, rigidly fixed and spatially scaffolded by micrometre-scale graphitic struts. Such a topological configuration provides intimate structural interconnectivities, freeway for electron/phonon transports, huge accessible surface area, as well as robust mechanical properties. The graphene network thus overcomes the drawbacks of presently available 3D graphene products and opens up a wide horizon for diverse practical usages, for example, high-power high-energy electrochemical capacitors, as highlighted in this work.
宏观世界中的三维石墨烯结构原则上可以保持单个石墨烯片的所有非凡纳米特性。然而，目前的 3D 石墨烯产品存在导电性差、比表面积低和机械强度/弹性不足的问题；互联的自支撑可重复 3D 石墨烯仍然无法获得。在这里，我们报告了一种基于聚合物前体的糖吹气方法，用于合成 3D 石墨烯泡沫网络。该泡沫网络由单原子层或少数原子层的石墨膜组成，这些石墨膜通过微尺度的石墨支柱紧密地粘在一起、刚性地固定和空间支撑。这种拓扑结构提供了紧密的结构连通性、电子/声子传输的高速公路、巨大的可用表面积以及坚固的机械性能。因此，石墨烯网络克服了目前可用的 3D 石墨烯产品的缺点，并为各种实际用途开辟了广阔的前景，例如，在这项工作中突出显示的高功率高能量电化学电容器。
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