Real-time observation of conformational switching in single conjugated polymer chains

Science Advances
Francisco Tenopala-CarmonaJ Carlos Penedo

Abstract

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 th...Continue Reading

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Citations

Jun 25, 2020·Science Advances·Chao-Yu LiJian-Feng Li
Aug 4, 2019·Scientific Reports·Pieter van der ScheerJoris Sprakel
May 25, 2021·The Journal of Physical Chemistry. B·Yaser A AlShetwiGünter Reiter
May 23, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·S E DomínguezC Kvarnström

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR
fluorescence microscopy
fluorescence

Software Mentioned

Zeonex
iSMS
Matlab

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