Yi Peng, Zou Haihan, Yu Yuanhang, Li Xufeng, Li Zhenyang, Deng Gao, Chen Chunyan, Fang Ming, He Junzhe, Sun Xin, Liu Xiaofang, Shui Jianglan, Yu Ronghai
School of Materials Science and Engineering, Beihang University, Beijing, 100191, PR China.
Science and Technology on Electromagnetic Scattering Laboratory, Beijing Institute of Environmental Features, Beijing 100854, PR China.
ACS Nano. 2022 Sep 27;16(9):14490-14502. doi: 10.1021/acsnano.2c04863. Epub 2022 Sep 12.
Stretchable conductive fibers are an important component of wearable electronic textiles, but often suffer from a decrease in conductivity upon stretching. The use of liquid metal (LM) droplets as conductive fillers in elastic fibers is a promising solution. However, there is an urgent need to develop effective strategies to achieve high adhesion of LM droplets to substrates and establish efficient electron transport paths between droplets. Here, we use large-sized MXene two-dimensional conductive materials to modify magnetic LM droplets and prepare MXene/magnetic LM/poly(styrene-butadiene-styrene) composite fibers (MLMS fibers). The MXene sheets decorated on the surface of magnetic LM droplets not only enhance the droplet adhesion to substrate but also bridge adjacent droplets to establish efficient conductive paths. MLMS fibers show several-fold improvements in tensile strength and elongation and a 30-fold increase in conductivity compared with pure LM-filled fibers. These conductive fibers can be easily woven into multifunctional textiles, which exhibit strong electromagnetic interference shielding and stable Joule heating performances even under large tensile deformation. In addition, other advantages of MLMS textiles, such as high gas/liquid permeability, strong chemical resistance (acid and alkaline conditions), high/low-temperature tolerance (-40-150 °C) and water washability, make them particularly suitable for wearable applications.
可拉伸导电纤维是可穿戴电子纺织品的重要组成部分，但在拉伸时往往会出现导电性下降的情况。在弹性纤维中使用液态金属（LM）微滴作为导电填料是一种很有前景的解决方案。然而，迫切需要开发有效的策略来实现LM微滴与基材的高附着力，并在微滴之间建立有效的电子传输路径。在此，我们使用大尺寸的MXene二维导电材料对磁性LM微滴进行改性，制备了MXene/磁性LM/聚（苯乙烯-丁二烯-苯乙烯）复合纤维（MLMS纤维）。装饰在磁性LM微滴表面的MXene片不仅增强了微滴与基材的附着力，还连接相邻微滴以建立有效的导电路径。与纯LM填充纤维相比，MLMS纤维的拉伸强度和伸长率提高了几倍，电导率提高了30倍。这些导电纤维可以很容易地编织成多功能纺织品，即使在大拉伸变形下也表现出很强的电磁干扰屏蔽和稳定的焦耳热性能。此外，MLMS纺织品的其他优点，如高气/液渗透性、强耐化学性（在酸性和碱性条件下）、高/低温耐受性（-40-150°C）和水洗性，使其特别适合可穿戴应用。
