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The contraction of PEDOT films formed on a macromolecular liquid-like surface
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-3899-4891
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 6, no 3, p. 654-660Article in journal (Refereed) Published
Abstract [en]

Vapour phase polymerized (VPP) PEDOT obtained using triblock copolymer PEG-PPG-PEG: Fe(III) tosylate polymeric oxidative layers has shown record-high conductivity and unique thermoelectric properties. These properties are related to the molecular weight, morphology and doping of PEDOT. Here we show that in its unwashed condition, the PEDOT chain adopts a neutral benzenoid conformation. The polymer chain converts into the charged quinoid structure after the removal of oxidizers with solvent washing. X-ray diffraction results suggest that the dopant is also incorporated into the packed polymer after the washing process. The changes in the chain structure and doping lead to the characteristic polaron and bipolaron absorption in the 800 and 1200 nm range. We observed a large contraction of the film after washing that is likely due to these changes, along with the removal of excessive polymer: oxidizer trapped in the PEDOT matrix. The contraction of films can be completely suppressed by mechanical clamping. PEDOT films without contraction show both a higher conductivity and higher optical transparency.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2018. Vol. 6, no 3, p. 654-660
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-145135DOI: 10.1039/c7tc04661hISI: 000423305000028OAI: oai:DiVA.org:liu-145135DiVA, id: diva2:1182453
Note

Funding Agencies|Strategic Research Foundation of Sweden through the project SiOS; Knut and Alice Wallenberg Foundation through the project PowerPaper; Knut and Alice Wallenberg Foundation

Available from: 2018-02-13 Created: 2018-02-13 Last updated: 2018-02-13

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Ouyang, LiangqiJafari, Mohammad JavadWanzhu, CaiEver Aguirre, LuisWang, Chuan FeiEderth, ThomasInganäs, Olle
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