Abstract
Abstract
Conducting polymers display a range of interesting properties, from electrical conduction to tunable optical absorption and mechanical flexibility, to name but a few. Their properties arise from positive charges (carbocations) on their conjugated backbone that are stabilised by counterions doped in the polymer matrix. In this research we report hydrolysis of these carbocations when poly(3,4-ethylenedioxy thiophene) is exposed to 1 mM aqueous salt solutions. Remarkably, two classes of anion interactions are revealed; anions that oxidise PEDOT via a doping process, and those that facilitate the SN1 hydrolysis of the carbocation to create hydroxylated PEDOT. A pKa of 6.4 for the conjugate acid of the anion approximately marks the transition between chemical oxidation and hydrolysis. PEDOT can be cycled between hydrolysis and oxidation by alternating exposure to different salt solutions. This has ramifications for using doped conducting polymers in aqueous environments (such as sensing, energy storage and biomedical devices).
Funder
Department of Education and Training | Australian Research Council
Publisher
Springer Science and Business Media LLC
Subject
Materials Chemistry,Biochemistry,Environmental Chemistry,General Chemistry
Reference49 articles.
1. Skotheim, T. A. & Reynolds, J. R. Conjugated polymers: theory, synthesis, properties, and characterization. (CRC Press, Boca Raton, 2007).
2. Kiess, H. G. Conjugated conducting polymers. Vol. 102 (Springer, Berlin, 1992).
3. Gueye, M. N., Carella, A., Faure-Vincent, J., Demadrille, R. & Simonato, J.-P. Progress in understanding structure and transport properties of PEDOT-based materials: a critical review. Prog. Mater. Sci. 108, 100616 (2020).
4. Gharahcheshmeh, M. H. & Gleason, K. Texture and nanostructural engineering of conjugated conducting and semiconducting polymers. Mater. Today Adv. 8, 100086 (2020).
5. Martin, D. C. et al. The Morphology of Poly(3,4-Ethylenedioxythiophene). Polym. Rev. 50, 340–384 (2010).
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