ABSTRACT

Stretchable conductors are important ingredients in the new emerging wearable systems. Here, intrinsically stretchable con­ductors (ISCs) based on carbon nanomaterials with a good balance of properties are prepared through synergistic combination of graphene and carbon black (CB) into the matrices of thermoplastic polyurethane (TPU). The inks are prepared through mixing graphene and CB with adjustable mass ratios in TPU by ball-milling, which can be used for blade-coating or 3D-printing. The ISCs prepared by drying the inks at room temperature afford an initial conductivity of 12.5 S cm^-1 with an elongation of 140%, or 62.5 S cm^-1 with an elongation of 20%, comparable to the carbon nanotube based ISCs. The whole performance is better than those of composites with only one filler (graphene or CB), suggesting the synergistic effect between graphene and CB. Furthermore, the composites with binary fillers have stable electromechanical properties for 1000 cycles of stretching and releasing.

摘要

可拉伸导体是新兴可穿戴系统的重要组成部分。在这里，通过将石墨烯和炭黑 (CB) 协同组合到热塑性聚氨酯 (TPU) 基质中，制备了基于具有良好平衡性能的碳纳米材料的本征可拉伸导体 (ISC)。墨水是通过球磨在TPU中混合质量比可调的石墨烯和CB制备的，可用于刮刀涂层或3D打印。通过在室温下干燥油墨制备的 ISC 提供 12.5 S cm ^-1的初始电导率 和 140% 的伸长率，即 62.5 S cm ^-1 伸长率为 20%，与基于碳纳米管的 ISC 相当。整体性能优于仅使用一种填料（石墨烯或 CB）的复合材料，表明石墨烯和 CB 之间存在协同效应。此外，具有二元填料的复合材料在 1000 次拉伸和释放循环中具有稳定的机电性能。