Super-elasticity of three-dimensionally cross-linked graphene materials all the way to deep cryogenic temperatures
Super-elasticity of three-dimensionally cross-linked graphene materials all the way to deep cryogenic temperatures
复制标题
三维交联石墨烯材料在深低温下具有超弹性
DOI：
10.1126/sciadv.aav2589
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发表时间：
2019-04-01
期刊：
影响因子：
13.6
通讯作者：
Chen, Yongsheng
中科院分区：
文献类型：
--
作者：
Zhao, Kai;Zhang, Tengfei;Chen, Yongsheng
首次观察到块体 3D 交联石墨烯泡沫在低温 4 至 1273 K 范围内具有不变的超弹性。迄今为止，尚未观察到在深低温下具有高弹性的材料。之前的报道表明，石墨烯和碳纳米管基多孔材料可以在液氮温度高达近千摄氏度的范围内表现出可逆的机械弹性行为。在这里，我们报告了三维交联石墨烯材料中宽温度不变的大应变超弹性行为，该行为甚至在 4 K 的液氦温度下也能持续存在，这是以前在任何其他材料中未观察到的特性。为了了解这些石墨烯材料的机械性能，我们通过原位实验和建模结果表明，这些显着的性能是单个石墨烯片的独特结构和固有弹性/柔性性能以及即使在恶劣温度下也能持续存在的片材之间的共价连接的协同结果。这些结果表明此类材料在极低温环境（例如外太空）中的可能应用。
For the first time, invariant super-elasticity from cryogenic 4 to 1273 K was observed for a bulk 3D cross-linked graphene foam. Until now, materials with high elasticity at deep cryogenic temperatures have not been observed. Previous reports indicated that graphene and carbon nanotube–based porous materials can exhibit reversible mechano-elastic behavior from liquid nitrogen temperature up to nearly a thousand degrees Celsius. Here, we report wide temperature–invariant large-strain super-elastic behavior in three-dimensionally cross-linked graphene materials that persists even to a liquid helium temperature of 4 K, a property not previously observed for any other material. To understand the mechanical properties of these graphene materials, we show by in situ experiments and modeling results that these remarkable properties are the synergetic results of the unique architecture and intrinsic elastic/flexibility properties of individual graphene sheets and the covalent junctions between the sheets that persist even at harsh temperatures. These results suggest possible applications for such materials at extremely low temperature environments such as those in outer space.