Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China.
School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China.
Nat Commun. 2018 Aug 28;9(1):3484. doi: 10.1038/s41467-018-05723-2.
It is crucial to align two-dimensional nanosheets to form a highly compact layered structure for many applications, such as electronics, optoelectronics, thermal management, energy storage, separation membranes, and composites. Here we show that continuous centrifugal casting is a universal, scalable and efficient method to produce highly aligned and compact two-dimensional nanosheets films with record performances. The synthesis mechanism, structure control and property dependence of alignment and compaction of the films are discussed. Significantly, 10-μm-thick graphene oxide films can be synthesized within 1 min, and scalable synthesis of meter-scale films is demonstrated. The reduced graphene oxide films show super-high strength (660 MPa) and conductivity (650 S cm). The reduced graphene oxide/carbon nanotube hybrid-film-based all-solid-state flexible supercapacitors exhibit ultrahigh volumetric capacitance (407 F cm) and energy density (~10 mWh cm) comparable to that of thin-film lithium batteries. We also demonstrate the production of highly anisotropic graphene nanocomposites as well as aligned, compact films and vertical heterostructures of various nanosheets.
将二维纳米片排列成高度致密的层状结构对于许多应用至关重要，例如电子、光电、热管理、能量存储、分离膜和复合材料。在这里，我们展示了连续离心铸造是一种通用、可扩展且高效的方法，可以生产具有创纪录性能的高度取向和致密的二维纳米片薄膜。讨论了薄膜的取向和压实的合成机制、结构控制和性能依赖性。值得注意的是，可在 1 分钟内合成 10 μm 厚的氧化石墨烯薄膜，并展示了可扩展的米级薄膜的合成。还原氧化石墨烯薄膜表现出超高强度（660 MPa）和导电性（650 S cm）。基于还原氧化石墨烯/碳纳米管杂化薄膜的全固态柔性超级电容器表现出超高体积电容（407 F cm）和能量密度（~10 mWh cm），可与薄膜锂电池相媲美。我们还展示了高度各向异性的石墨烯纳米复合材料以及各种纳米片的取向、致密薄膜和垂直异质结构的制备。
