Barrier films to control loss of 9,10-anthraquinone-2-sulphonate dopant from PEDOT films during electrochemical transitions

We describe a simple approach for the synthesis of stable electroactive poly[3,4-ethylene dioxythiophene] (PEDOT) in an acid medium, by incorporating a redox active dopant like 9,10-anthraquinone-2-sodium sulphonate (AQS) on a glassy carbon (GC) electrode. The modified electrode is responsive up to...

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Bibliographic Details
Published in:Electrochimica acta 2009-05, Vol.54 (13), p.3618-3622
Main Authors: Harish, S., Sridharan, D., Senthil Kumar, S., Joseph, James, Phani, K.L.N.
Format: Article
Language:English
Subjects:
Anthraquinone sulphonate
Barrier film
Chemistry
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
Nafion
Other electrodes
PEDOT
Polystyrene sulphonate
Stability
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Summary:We describe a simple approach for the synthesis of stable electroactive poly[3,4-ethylene dioxythiophene] (PEDOT) in an acid medium, by incorporating a redox active dopant like 9,10-anthraquinone-2-sodium sulphonate (AQS) on a glassy carbon (GC) electrode. The modified electrode is responsive up to a pH of 7. The stability of the modified electrode during continuous electrochemical cycling is poor, due to leaching of the dopant from the PEDOT film. Efforts are made to improve the stability of the modified electrode by forming an anionic barrier film on the PEDOT-AQS interface either physically or electrochemically. The modified electrodes were monitored by cyclic voltammetry and Fourier transform-infrared (FT-IR) spectroscopy for the presence of AQS in the film.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2009.01.032