The surface modification of aramid fibers is an essential and potent approach to manipulate and improve fiber properties. Biogenic fibers are in stark contrast, as exemplified by the case of natural silk fibers. This high-performance fiber features a surface functionalization as a thin sericin film enwraps it for improving the mechanical properties of silks. Inspired by this unique sheath structure of biogenic silk, we improved the performance of aramid fibers by exploiting a coating composed of reduced graphene oxide nanosheets that self-assemble on the fiber surface guided by hydrogen bonding and π-π stacking interactions. The graphene functionalized aramid fibers show a remarkable 1 GPa improvement in tensile strength. Moreover, the functionalized aramid fiber also shows high electrical conductivity which preserved 99% of its conductivity even after 100 cycles. Our approach provides a universal strategy for improving the performance of the fiber via surface functionalization by graphene nanosheets.

芳族聚酰胺纤维的表面改性是控制和改善纤维性能的重要且有效的方法。生物天然纤维形成了鲜明的对比，例如天然丝纤维。这种高性能纤维具有表面功能化，因为丝胶蛋白薄膜包裹了纤维，可改善丝绸的机械性能。受生物丝这种独特的鞘结构的启发，我们通过利用由还原的氧化石墨烯纳米片组成的涂层改善了芳纶纤维的性能，该涂层通过氢键和π-π堆叠相互作用在纤维表面上自组装。石墨烯官能化的芳族聚酰胺纤维在拉伸强度方面显示出显着的1 GPa改善。此外，功能化的芳族聚酰胺纤维还显示出高电导率，即使经过100次循环后仍保留其99％的电导率。我们的方法为通过石墨烯纳米片的表面功能化改善纤维性能提供了一种通用策略。