Real-time observation of conformational switching in single conjugated polymer chains.
Real-time observation of conformational switching in single conjugated polymer chains.
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DOI：
10.1126/sciadv.aao5786
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发表时间：
2018-03
期刊：
影响因子：
13.6
通讯作者：
Penedo JC
中科院分区：
文献类型：
--
作者：
Tenopala-Carmona F;Fronk S;Bazan GC;Samuel IDW;Penedo JC
有机溶剂中的单分子实验为共轭聚合物的构象动力学提供了新的见解。共轭聚合物（CP）是一类重要的有机半导体，它将新颖的光电特性与有机溶剂的简单加工结合在一起。研究溶液中的 CP 构象对于了解这些材料的物理性质非常重要，因为它会影响溶液加工薄膜的性能。单分子技术的独特之处在于能够在链到链的基础上提取信息；然而，就CP而言，技术挑战限制了它们在宿主基质或半液体环境中的普遍应用，这些环境限制了聚合物的构象动力学。我们引入了一种概念上不同的方法，可以使用聚合物链的单端锚定在有机溶剂中进行测量，以避免扩散，同时保持聚合物的柔韧性。我们探索了有机溶剂的影响，结果表明，除了链间构象异质性之外，塌陷和延伸的聚合物链段可以在同一链内共存。该技术能够实现实时溶剂交换测量，这表明锚定的 CP 链能够在亚秒级时间内响应溶剂条件的突然变化。我们的结果使人们对溶剂诱导的 CP 重组机制有了前所未有的了解，并有望催生一系列新的技术来研究和操纵 CP 的构象。
Single-molecule experiments in organic solvents provide new insight into the conformational dynamics of conjugated polymers. Conjugated polymers (CPs) are an important class of organic semiconductors that combine novel optoelectronic properties with simple processing from organic solvents. It is important to study CP conformation in solution to understand the physics of these materials and because it affects the properties of solution-processed films. Single-molecule techniques are unique in their ability to extract information on a chain-to-chain basis; however, in the context of CPs, technical challenges have limited their general application to host matrices or semiliquid environments that constrain the conformational dynamics of the polymer. We introduce a conceptually different methodology that enables measurements in organic solvents using the single-end anchoring of polymer chains to avoid diffusion while preserving polymer flexibility. We explore the effect of organic solvents and show that, in addition to chain-to-chain conformational heterogeneity, collapsed and extended polymer segments can coexist within the same chain. The technique enables real-time solvent-exchange measurements, which show that anchored CP chains respond to sudden changes in solvent conditions on a subsecond time scale. Our results give an unprecedented glimpse into the mechanism of solvent-induced reorganization of CPs and can be expected to lead to a new range of techniques to investigate and conformationally manipulate CPs.
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影响因子：
1.8
作者：
Arnould, MA;Polce, MJ;Wesdemiotis, C
通讯作者：
Wesdemiotis, C
DOI：
10.3390/ma7032273
发表时间：
2014-03-19
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Botiz I;Stingelin N
通讯作者：
Stingelin N
影响因子：
2.9
作者：
Grussmayer, Kristin S.;Steiner, Florian;Vogelsang, Jan
通讯作者：
Vogelsang, Jan
影响因子：
3.6
作者：
Godt, A;Ünsal, Ö;Roos, M
通讯作者：
Roos, M
影响因子：
64.8
作者：
Hu, DH;Yu, J;Barbara, PF
通讯作者：
Barbara, PF