Journal article
Charge Transport in Conjugated Polymers with Pendent Stable Radical Groups
Chemistry of materials, Vol.30(14), pp.4799-4807
07/24/2018
DOI: 10.1021/acs.chemmater.8b02076
Abstract
Synthesizing a stable radical polymer with a conjugated backbone seems like a natural way to introduce conductivity to radical polymers, which are traditionally synthesized with insulating, nonconjugated backbones. For charge storage applications that take advantage of the redox-active nature of stable radical polymers, enhanced conductivity would improve performance. To explore the interplay between stable radicals and a conjugated backbone, we prepared and studied soluble polythiophene with high regioregularity and various concentrations of pendent radical groups to systematically examine any change in conductivity with radical incorporation. Using electron paramagnetic resonance and electrical conductivity measurements, we show that there is an exponential decrease in conductivity as we increase the percentage of pendent groups attached to repeating units, which changes the conductivity by 6 orders of magnitude between the nonradical control polythiophene material and the material with the highest radical content (∼80%). These findings serve as an important guide to the future design of radical polymers on conjugated backbones with the goal of tuning conductivity as a function of stable radical content in redox-active energy storage applications.
Details
- Title: Subtitle
- Charge Transport in Conjugated Polymers with Pendent Stable Radical Groups
- Creators
- Yiren Zhang - Cornell UniversityAlbert M Park - Cornell UniversityStephen R McMillan - Optical Science and Technology Center and Department of Physics and AstronomyNicholas J Harmon - University of IowaMichael E Flatté - University of IowaGregory D Fuchs - Cornell UniversityChristopher K Ober - Cornell University
- Resource Type
- Journal article
- Publication Details
- Chemistry of materials, Vol.30(14), pp.4799-4807
- Publisher
- American Chemical Society
- DOI
- 10.1021/acs.chemmater.8b02076
- ISSN
- 0897-4756
- eISSN
- 1520-5002
- Grant note
- DOI: 10.13039/100006151, name: Basic Energy Sciences, award: DE-SC0014336
- Language
- English
- Date published
- 07/24/2018
- Academic Unit
- Physics and Astronomy; Electrical and Computer Engineering
- Record Identifier
- 9984429045102771
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