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Open AccessArticle

Role of Doping Agent Degree of Sulfonation and Casting Solvent on the Electrical Conductivity and Morphology of PEDOT:SPAES Thin Films

1
Department of Chemistry, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
2
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3A, 30167 Hannover, Germany
3
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
4
CRC Materiali Polimerici “LaMPo”, Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Maria J. Sanchis, Marta Carsí, Michael J.D. Nugent and Pilar Ortiz Serna
Polymers 2021, 13(4), 658; https://doi.org/10.3390/polym13040658
Received: 30 January 2021 / Revised: 18 February 2021 / Accepted: 19 February 2021 / Published: 23 February 2021
(This article belongs to the Special Issue Polymeric Thin Films and Membranes II)
Poly(3,4-ethylenedioxythiophene) (PEDOT) plays a key role in the field of electrically conducting materials, despite its poor solubility and processability. Various molecules and polymers carrying sulfonic groups can be used to enhance PEDOT’s electrical conductivity. Among all, sulfonated polyarylether sulfone (SPAES), prepared via homogenous synthesis with controlled degree of sulfonation (DS), is a very promising PEDOT doping agent. In this work, PEDOT was synthesized via high-concentration solvent-based emulsion polymerization using 1% w/w of SPAES with different DS as dopant. It was found that the PEDOT:SPAESs obtained have improved solubility in the chosen reaction solvents, i.e., N, N-dimethylformamide, dimethylacetamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone and, for the first time, the role of doping agent, DS and polymerization solvents were investigated analyzing the electrical properties of SPAESs and PEDOT:SPAES samples and studying the different morphology of PEDOT-based thin films. High DS of SPAES, i.e., 2.4 meq R-SO3× g−1 of polymer, proved crucial in enhancing PEDOT’s electrical conductivity. Furthermore, the DMSO capability to favor PEDOT and SPAES chains rearrangement and interaction results in the formation of a polymer film with more homogenous morphology and higher conductivity than the ones prepared from DMAc, DMF, and NMP. View Full-Text
Keywords: sulfonated polyarylether sulfone; poly(3,4-ethylenedioxythiophene); doping agent; degree of sulfonation; casting solvent effect; electrically conductive thin films sulfonated polyarylether sulfone; poly(3,4-ethylenedioxythiophene); doping agent; degree of sulfonation; casting solvent effect; electrically conductive thin films
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MDPI and ACS Style

Tomasino, D.V.; Wolf, M.; Farina, H.; Chiarello, G.; Feldhoff, A.; Ortenzi, M.A.; Sabatini, V. Role of Doping Agent Degree of Sulfonation and Casting Solvent on the Electrical Conductivity and Morphology of PEDOT:SPAES Thin Films. Polymers 2021, 13, 658. https://doi.org/10.3390/polym13040658

AMA Style

Tomasino DV, Wolf M, Farina H, Chiarello G, Feldhoff A, Ortenzi MA, Sabatini V. Role of Doping Agent Degree of Sulfonation and Casting Solvent on the Electrical Conductivity and Morphology of PEDOT:SPAES Thin Films. Polymers. 2021; 13(4):658. https://doi.org/10.3390/polym13040658

Chicago/Turabian Style

Tomasino, Daniela V.; Wolf, Mario; Farina, Hermes; Chiarello, Gianluca; Feldhoff, Armin; Ortenzi, Marco A.; Sabatini, Valentina. 2021. "Role of Doping Agent Degree of Sulfonation and Casting Solvent on the Electrical Conductivity and Morphology of PEDOT:SPAES Thin Films" Polymers 13, no. 4: 658. https://doi.org/10.3390/polym13040658

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