Journal
ACS APPLIED POLYMER MATERIALS
Volume 1, Issue 7, Pages 1778-1786Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00321
Keywords
polymer blends; semiconducting nanofibers; organic field-effect transistors; stretchable electronics; solution processing
Funding
- National Science Foundation [1653909]
- Purdue University
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1653909] Funding Source: National Science Foundation
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Molecular self-assembly in isoindigo-based binary polymer blends as a novel platform for facile and robust formation of semiconducting nanofibers is studied. We designed structurally complementary polymers to process all-semiconducting nanocomposites. The selection of the tie-polymer for nucleation and nanofiber formation was probed by tuning crystallinity via side chain engineering. Morphology studies revealed that the crystallinity and the scale-like morphology of the tie-polymer play a crucial role in making long and well stacked nanofiber networks. The optimized blends could be solution-processed into nanotailored semiconducting thin films with no postprocessing steps required. The nanofiber formation in thin films further led to lowered elastic moduli and glass transition but higher crack-on-set strain as well as excellent charge transport properties. The formed nanofibers could also be aligned via a blade-directed shearing method to fabricate organic field-effect transistor devices. Our blending strategy shows to be a promising facile route for processing flexible and stretchable organic semiconducting thin films.
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