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Mechanical analysis of graphene-based woven nano-fabric

机译：石墨烯基编织纳米纤维的力学分析

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摘要

Tailoring and assembling graphene into functional structures with well-defined configurations has been emerging as a key way for utilizing it in many promising applications. Here we report a graphene-based woven nano-fabric (GWNF) composed of graphene nanoribbons (GNR) which are interlaced with each other in an over and under fashion. Simulation results inform that the mechanical properties of GWNF can be tuned by the weave density of GNRs. Compared with pristine graphene, GWNF demonstrates a significantly enhanced flexibility with outstanding toughness and unprecedented energy-absorption capability. Shear forces from adjacent GNRs exert a negative impact to deteriorate the stretch capability of GWNF. Through the pull-out test of single central GNR, GWNF with inherent curvatures and defects leads to a riveting inter-locking phenomenon followed by a pronounced jump of pull-out force. GWNF with a high density of GNRs reproduces mechanical properties similar to graphene via nanoindentation while GWNF with a low density of GNRs exhibits an extraordinary toughness unmatched by graphene. These intriguing mechanical properties of GWNF insinuate that it can serve as a solid building block to envisage a large variety of applications such as composites, strain sensors, and solar cells by taking advantages of the special woven structure.
机译：将石墨烯定制和组装成具有明确定义的功能结构已成为在许多有前途的应用中利用它的一种关键方法。在这里，我们报告了由石墨烯纳米带（GNR）组成的基于石墨烯的机织纳米织物（GWNF），它们以过度和不足的方式相互交织。仿真结果表明，可以通过GNR的编织密度来调整GWNF的机械性能。与原始石墨烯相比，GWNF表现出显着增强的柔韧性，出色的韧性和前所未有的能量吸收能力。来自相邻GNR的剪切力产生负面影响，从而降低了GWNF的拉伸能力。通过对单个中央GNR的拉拔测试，具有固有曲率和缺陷的GWNF导致了铆接互锁现象，随后拉拔力明显跳升。具有高密度GNR的GWNF通过纳米压痕可再现类似于石墨烯的机械性能，而具有低密度GNR的GWNF则具有石墨烯无法比拟的非凡韧性。 GWNF的这些令人着迷的机械性能暗示，它可以用作固体构件，以利用特殊的编织结构来设想多种应用，例如复合材料，应变传感器和太阳能电池。

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