State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.
Soft Matter. 2018 Jul 18;14(28):5906-5912. doi: 10.1039/c8sm01130c.
One-dimensional (1D) helical nanofibers were prepared through the self-assembly of an achiral all-conjugated diblock copolymer, poly(3-hexylthiophene)-b-poly[3-(6-hydroxyl)hexylthiophene] (P3HT-b-P3HHT) in an aged pyridine solution. Such helical nanofibers were formed by the π-π interaction between planar rigid polythiophene backbones cooperating with the hydrogen-bonding interactions between the polar hydroxyl groups of the side chains of polythiophenes. Intriguingly, the Young's modulus of such helical fibers is as high as ∼5.16 GPa, which is about twice that of P3HT films characterized by the peak force quantitative nanomechanical (PF-QNM) method. Furthermore, for the first time, we report that such helical fibers based on all-conjugated polythiophenes exhibited a relatively high field-effect mobility of 0.03472 cm2 V-1 s-1. This work provides a promising approach to craft crystalline helical nanostructures based on polythiophenes possessing both superior mechanical and good charge transport properties, which has great potential for application in other π-conjugated systems or building blocks for complex superstructures, and mechanical and optoelectronic devices.
一维（1D）螺旋纳米纤维通过非手性全共轭两亲嵌段共聚物聚（3-己基噻吩）-b-聚[3-（6-羟基）己基噻吩]（P3HT-b-P3HHT）在老化的吡啶溶液中的自组装制备而成。这些螺旋纳米纤维是由平面刚性聚噻吩骨架之间的π-π相互作用与聚噻吩侧链上的极性羟基之间的氢键相互作用共同形成的。有趣的是，这些螺旋纤维的杨氏模量高达约 5.16 GPa，约为通过峰值力定量纳米力学（PF-QNM）方法表征的 P3HT 薄膜的两倍。此外，我们首次报道了基于全共轭聚噻吩的这些螺旋纤维表现出相对较高的场效应迁移率为 0.03472 cm2 V-1 s-1。这项工作为基于聚噻吩的结晶螺旋纳米结构的制备提供了一种很有前景的方法，这些结构具有优异的机械性能和良好的电荷输运性能，在其他π共轭体系或用于构建复杂超结构以及机械和光电设备的构建模块中具有很大的应用潜力。
