论文标题：Efficient and scalable synthesis of highly aligned and compact two-dimensional nanosheet films with record performances

期刊：Nature Communications

作者：Jing Zhong, Wei Sun, Qinwei Wei, Xitang Qian, Hui-Ming Cheng, Wencai Ren

发表时间：2018/08/28

数字识别码： 10.1038/s41467-018-05723-2

原文链接：http://t.cn/EyM6n4Z

最近《自然-通讯》发表的一项研究Efficient and scalable synthesis of highly aligned and compact two-dimensional nanosheet films with record performances报道了一种通用的、高效的、可量产的方法——连续离心铸造法——该方法用于生产高度取向和紧密的二维纳米片薄膜，并且具有创纪录的性能。

在电子、光电子、热管理、能量储存、膜分离和复合材料等应用领域，如何将二维纳米片取向排列以形成高度紧密的层状结构至关重要。

来自中国科学院金属研究所沈阳材料科学国家实验室的Wencai Ren以及研究团队在本文中，探讨了该材料的合成机理、结构控制以及材料性能对于取向和紧密度的依赖性。非常重要的一点是，该方法可以在1分钟的时间内合成10微米厚的氧化石墨烯薄膜，并且制备薄膜长度可以达到米的数量级。该氧化石墨烯薄膜展现了超高的强度（~660 MPa）和导电性（~650 S cm−1）。基于该氧化石墨烯/碳纳米管复合薄膜的全固态柔性超级电容器具有超高容量电容（407 F cm−3）和能量密度（~10 mWh cm−3），其性能可以和薄膜锂电池相媲美。此外，研究人员还展示了高各向异性石墨烯纳米复合材料的制备以及各种纳米片的排列紧密薄膜和垂直异质结构。

图1：高取向紧密氧化石墨烯薄膜的制备及表征

摘要：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−1). The reduced graphene oxide/carbon nanotube hybrid-film-based all-solid-state flexible supercapacitors exhibit ultrahigh volumetric capacitance (407 F cm−3) and energy density (~10 mWh cm−3) 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.

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期刊介绍：Nature Communications (https://www.nature.com/ncomms/) is an open access journal that publishes high-quality research from all areas of the natural sciences. Papers published by the journal represent important advances of significance to specialists within each field.

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来源：科学网