Chen Huijun, Xu Huimin, Luo Mengying, Wang Wen, Qing Xing, Lu Ying, Liu Qiongzhen, Yang Liyan, Zhong Weibing, Li Mufang, Wang Dong
Key Laboratory of Textile Fiber and Products, Ministry of Education, Wuhan Textile University, Wuhan 430200, China.
ACS Appl Mater Interfaces. 2023 Apr 26;15(16):20346-20357. doi: 10.1021/acsami.3c00155. Epub 2023 Apr 12.
Conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fibers with high electrical conductivity, flexibility, and robustness are urgently needed for constructing wearable fiber-based electronics. In this study, the highly conductive (4288 S/cm), ultrastrong (a high tensile strength of 956 MPa), and flexible (a low Young's modulus of 3.8 GPa) PEDOT:PSS/1-ethyl-3-methylimidazolium dicyanamide (EMIM:DCA) (P/ED) fiber was prepared by wet-spinning and a subsequent HSO-immersion-drawing process. As far as we know, this is the best performance of the PEDOT:PSS fiber reported so far. The structure and conformation of the P/ED fiber were characterized by FESEM, XPS, Raman spectroscopy, UV-vis-NIR spectroscopy, and WAXS. The results show that the high performances of the P/ED fiber are mainly attributed to the massive removal of PSS and high degree of crystallinity (87.9%) and orientation (0.71) of PEDOT caused by the synergistic effect of the ionic liquid, concentrated sulfuric acid, and high stretching. Besides, the P/ED fiber shows a small bending radius of 0.1 mm, and the conductivity of the P/ED fiber is nearly unchanged after 1000 repeated cycles of bending and humidity changes within 50-90%. Based on this, various P/ED fiber-based devices including the circuit connection wire, thermoelectric power generator, and temperature sensor were constructed, demonstrating its wide applications for constructing flexible and wearable electronics.
构建可穿戴纤维基电子产品迫切需要具有高导电性、柔韧性和坚固性的导电聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）纤维。在本研究中，通过湿纺和随后的HSO浸渍拉伸工艺制备了高导电率（4288 S/cm）、超强（高拉伸强度为956 MPa）和柔性（低杨氏模量为3.8 GPa）的PEDOT:PSS/1-乙基-3-甲基咪唑二氰胺（EMIM:DCA）（P/ED）纤维。据我们所知，这是迄今为止报道的PEDOT:PSS纤维的最佳性能。通过场发射扫描电子显微镜（FESEM）、X射线光电子能谱（XPS）、拉曼光谱、紫外-可见-近红外光谱和广角X射线散射（WAXS）对P/ED纤维的结构和构象进行了表征。结果表明，P/ED纤维的高性能主要归因于离子液体、浓硫酸和高拉伸的协同作用导致大量PSS的去除以及PEDOT的高结晶度（87.9%）和取向度（0.71）。此外，P/ED纤维的弯曲半径小至0.1 mm，在50-90%的湿度变化和1000次反复弯曲循环后，P/ED纤维的导电性几乎不变。基于此，构建了包括电路连接线、热电发电机和温度传感器在内的各种基于P/ED纤维的器件，证明了其在构建柔性和可穿戴电子产品方面的广泛应用。
