One-dimensional high-performance yarns with excellent conductivity and flexibility are of considerable interest in the energy and aerospace industries. However, how to achieve highly conductivity, excellent flexibility, extreme condition durability and high mechanical performance in one fiber material is still a great challenge using economically viable materials and synthesis technologies. Herein, we report electrically conductive yarns (modified polyimide (M-PI)/reduced graphene oxide (RGO) yarns) consisting of RGO coated on the surface of nitrogen plasma M-PI yarns, which are fabricated by combining the N₂ plasma pre-treatment and repeated dip-coating and reducing technique. N₂ plasma treatment is used to roughen the surface of the PI yarn and introduce functional groups, contributing to improve wettability, which can provide a stronger adhesion of the graphene coating. The dip-coating and reducing process was repeated 10 times to enhance the loading mass of RGO on the PI yarns, then M-PI/RGO yarns with better conductivity property can be obtained. The effects of N₂ plasma treatment power and time on the M-PI yarns and M-PI/RGO yarns are investigated and discussed. The results demonstrate that the graphene layer is uniformly and densely coated on the PI yarn when being treated at 200 W for 8 min, and the conductivity of the M-PI/RGO yarn reaches 1.51 × 10² S/m. The M-PI/RGO yarn combine the advantages of RGO and PI yarns, retaining the mechanical properties and thermal stability of PI yarn while exploiting the conductive property of RGO. In addition, the enhanced adhesion between the PI yarn and graphene coating endows the composite yarns with excellent fastness and superior flexibility. This work describes an environmentally friendly, controllable and facile method to develop flexible and conductive functional graphene-coated PI yarns with high-performance properties.

具有优异的导电性和柔韧性的一维高性能纱线在能源和航空航天工业中引起了极大的兴趣。然而，使用一种经济可行的材料和合成技术，如何在一种纤维材料中实现高导电性，出色的柔韧性，极端条件的耐久性和高机械性能仍然是一个巨大的挑战。在此，我们报告了由NGO等离子体预混N ₂等离子体制成的导电纱线（改性聚酰亚胺（M-PI）/还原氧化石墨烯（RGO）纱线），其由涂在氮等离子体M-PI纱线表面的RGO组成。处理和重复浸涂和还原技术。N ₂等离子处理用于使PI纱线的表面变粗糙并引入官能团，从而有助于改善润湿性，从而可以提供更强的石墨烯涂层附着力。重复10次浸涂和还原过程，以提高RGO在PI纱线上的负载质量，然后可以得到具有更好导电性的M-PI / RGO纱线。研究并讨论了N ₂等离子体处理能力和时间对M-PI纱线和M-PI / RGO纱线的影响。结果表明，当在200 W下处理8 min时，石墨烯层均匀，致密地覆盖在PI纱线上，M-PI / RGO纱线的电导率达到1.51×10 ^2。S / m。M-PI / RGO纱线结合了RGO和PI纱线的优点，在保留RGO导电性能的同时，保留了PI纱线的机械性能和热稳定性。此外，PI纱线和石墨烯涂层之间增强的附着力使复合纱线具有出色的牢度和出色的柔韧性。这项工作描述了一种环境友好，可控且简便的方法，以开发具有高性能的柔性导电功能性石墨烯涂层PI纱线。