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Hydrogen-bonding-directed helical nanofibers in a polythiophene-based all-conjugated diblock copolymer

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Abstract

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.

Graphical abstract: Hydrogen-bonding-directed helical nanofibers in a polythiophene-based all-conjugated diblock copolymer

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Publication details

The article was received on 01 Jun 2018, accepted on 25 Jun 2018 and first published on 26 Jun 2018


Article type: Paper
DOI: 10.1039/C8SM01130C
Citation: Soft Matter, 2018, Advance Article
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    Hydrogen-bonding-directed helical nanofibers in a polythiophene-based all-conjugated diblock copolymer

    H. Cui, X. Chen, Y. Wang, D. Wei, F. Qiu and J. Peng, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM01130C

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