Iron-Catalyzed Polymerization of Alkoxysulfonate-Functionalized 3,4-Ethylenedioxythiophene Gives Water-Soluble Poly(3,4-ethylenedioxythiophene) of High Conductivity

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• 作者：Roger H. Karlsson ; Anna Herland ; Mahiar Hamedi ; Jens A. Wigenius ; Andreas Å ; slund ; Xianjie Liu ; Mats Fahlman ; Olle Ingans ; Peter Konradsson
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：May 12, 2009
• 年：2009
• 卷：21
• 期：9
• 页码：1815-1821
• 全文大小：165K
• 年卷期：v.21,no.9(May 12, 2009)
• ISSN：1520-5002

文摘

Chemical polymerization of a 3,4-ethylenedioxythiophene derivative bearing a sulfonate group (EDOT-S) is reported. The polymer, PEDOT-S, is fully water-soluble and has been produced by polymerizing EDOT-S in water, using Na₂S₂O₈ and a catalytic amount of FeCl₃. Elemental analysis and XPS measurements indicate that PEDOT-S is a material with a substantial degree of self-doping, but also contains free sulfate ions as charge-balancing counterions of the oxidized polymer. Apart from self-doping PEDOT-S, the side chains enable full water solubility of the material; DLS studies show an average cluster size of only 2 nm. Importantly, the solvation properties of the PEDOT-S are reflected in spin-coated films, which show a surface roughness of 1.2 nm and good conductivity (12 S/cm) in ambient conditions. The electro-optical properties of this material are shown with cyclic voltammetry and spectroelectrochemical experiment reveals an electrochromic contrast (48% at λ_max = 606 nm).