The field of conjugated polymer research is hindered by the multitude of effects that can play a role in determining film morphology and device efficiency, including doping by oxygen. We propose a new and simple method for morphological investigation of self-assembled nanofibers and microstructures, as well as films. Taking advantage of the physisorption of oxygen and concomitant modifications of fluorescence behavior, we spatially resolve domains in poly-3-hexylthiophene that are not visible in typical imagery. No special equipment is necessary beyond a widefield fluorescence microscope and inert sample environment, yet excellent resolution is afforded. Emission from amorphous chains is mostly linear in response to decades of excitation intensity, whereas chains with exciton coupling saturate, providing another domain identification quality that corroborates the oxygen dedoping kinetic imaging. Two-color detection ties these results to a library of literature, cementing the domain ordering assignments and thus finally making clear the oxygen doping affinities of differing conjugated polymer phases.

Resolution of oxygen-doping heterogeneity in P3HT solid phases via fluorescence microscopy

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.