Li Peng, Yang Mincheng, Liu Yingjun, Qin Huasong, Liu Jingran, Xu Zhen, Liu Yilun, Meng Fanxu, Lin Jiahao, Wang Fang, Gao Chao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, 310027, Hangzhou, P. R. China.
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, 710049, Xi'an, P. R. China.
Nat Commun. 2020 May 27;11(1):2645. doi: 10.1038/s41467-020-16494-0.
Graphene has an extremely high in-plane strength yet considerable out-of-plane softness. High crystalline order of graphene assemblies is desired to utilize their in-plane properties, however, challenged by the easy formation of chaotic wrinkles for the intrinsic softness. Here, we find an intercalation modulated plasticization phenomenon, present a continuous plasticization stretching method to regulate spontaneous wrinkles of graphene sheets into crystalline orders, and fabricate continuous graphene papers with a high Hermans' order of 0.93. The crystalline graphene paper exhibits superior mechanical (tensile strength of 1.1 GPa, stiffness of 62.8 GPa) and conductive properties (electrical conductivity of 1.1 × 10 S m, thermal conductivity of 109.11 W m K). We extend the ultrastrong graphene papers to the realistic laminated composites and achieve high strength combining with attractive conductive and electromagnetic shielding performance. The intercalation modulated plasticity is revealed as a vital state of graphene assemblies, contributing to their industrial processing as metals and plastics.
石墨烯具有极高的面内强度，但面外柔软度也相当可观。为了利用石墨烯组件的面内特性，需要其具有高结晶度，然而，由于其固有的柔软性容易形成混乱的褶皱，这一目标受到了挑战。在此，我们发现了一种插层调制的塑化现象，提出了一种连续塑化拉伸方法，以将石墨烯片的自发褶皱调节成结晶有序结构，并制备出具有0.93的高赫尔曼有序度的连续石墨烯纸。这种结晶石墨烯纸表现出优异的机械性能（拉伸强度为1.1 GPa，刚度为62.8 GPa）和导电性能（电导率为1.1×10 S m，热导率为109.11 W m K）。我们将这种超强石墨烯纸扩展到实际的层压复合材料中，并实现了高强度与引人注目的导电和电磁屏蔽性能的结合。插层调制的可塑性被揭示为石墨烯组件的一种重要状态，有助于它们像金属和塑料一样进行工业加工。
