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One-Step Wet-Spinning Process of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Fibers and the Origin of Higher Electrical Conductivity
journal contribution
posted on 2011-01-01, 00:00 authored by R Jalili, Joselito RazalJoselito Razal, P Innis, G WallaceA simplified wet-spinning process for the production of continuous poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fibers is reported. Conductivity enhancement of PEDOT:PSS fibers up to 223 S cm−1 has been demonstrated when these fibers are exposed to ethylene glycol as a post-synthesis processing step. In a new spinning approach it is shown that by employing a spinning formulation consisting of an aqueous blend of PEDOT:PSS and poly(ethlylene glycol), the need for post-spinning treatment with ethylene glycol is eliminated. With this approach, 30-fold conductivity enhancements from 9 to 264 S cm−1 are achieved with respect to an untreated fiber. This one-step approach also demonstrates a significant enhancement in the redox properties of the fibers. These improvements are attributed to an improved molecular ordering of the PEDOT chains in the direction of the fiber axis and the consequential enrichment of linear (or expanded-coil like) conformation to preference bipolaronic electronic structures as evidenced by Raman spectroscopy, solid-state electron spin resonance (ESR) and in situ electrochemical ESR studies.
History
Journal
Advanced Functional MaterialsVolume
21Issue
17Pagination
3363 - 3370Publisher
Wiley-VCH VerlagLocation
Weinheim, GermanyPublisher DOI
ISSN
1616-301XLanguage
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2011, WILEY-VCH VerlagUsage metrics
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Categories
Keywords
PEDOT:PSSConductive fibersWet-spinningRaman spectroscopyElectron spin resonance spectroscopyScience & TechnologyPhysical SciencesTechnologyChemistry, MultidisciplinaryChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterChemistryScience & Technology - Other TopicsMaterials SciencePhysicsPOLYANILINE FIBERSENHANCEMENTMORPHOLOGYSULFONATE)STABILITYMECHANISMRAMAN