Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 4, Pages 2229-2235Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp411668g
Keywords
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Funding
- U.S. Department of Energy [DE-FG02-05ER15695]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0006639]
- U.S. Department of Energy (DOE) [DE-SC0006639, DE-FG02-05ER15695] Funding Source: U.S. Department of Energy (DOE)
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A combination of wavelength-, time-, and polarization-resolved photoluminescence imaging on isolated P3HT nanofibers of varying molecular weight (from 10 to 65 kDa) has revealed a transition in dominant exciton coupling from primarily interchain (H-aggregation) for low molecular weight nanofibers, to predominantly intrachain (J-aggregation) coupling for high molecular weight nanofibers. Based on nanofiber width measurement from TEM imaging, the driving force for this transition appears to be folding of individual polymer chains within the lamellae, resulting in enhanced chain planarity and reduced torsional disorder.
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