Efforts to obtain high-strength graphene sheets by near-room-temperature assembly have been frustrated by the misalignment of graphene layers, which degrades mechanical properties. While in-plane stretching can decrease this misalignment, it reappears when releasing the stretch. Here we use covalent and π–π inter-platelet bridging to permanently freeze stretch-induced alignment of graphene sheets, and thereby increase isotropic in-plane sheet strength to 1.55 GPa, in combination with a high Young’s modulus, electrical conductivity and weight-normalized shielding efficiency. Moreover, the stretch-bridged graphene sheets are scalable and can be easily bonded together using a commercial resin without appreciably decreasing the performance, which establishes the potential for practical applications.

通过近室温组装获得高强度石墨烯片的努力因石墨烯层的未对准而受挫，这会降低机械性能。虽然平面内拉伸可以减少这种错位，但在释放拉伸时它会重新出现。在这里，我们使用共价键和 π-π 片间桥接来永久冻结拉伸诱导的石墨烯片排列，从而将各向同性面内片强度提高到 1.55 GPa，并结合高杨氏模量、电导率和重量归一化屏蔽效率。此外，拉伸桥接石墨烯片具有可扩展性，可以使用商业树脂轻松粘合在一起，而不会明显降低性能，这为实际应用奠定了基础。