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Monitoring of the electrochemical degradation of PEDOT films on gold using the bending beam method

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Abstract

Electrochemical and mechanical properties of thin poly(3,4-ethylenedioxythiophene) films deposited on gold have been investigated in aqueous sulfuric acid and sodium-sulfate solutions. It has been shown that at sufficiently positive electrode potentials, overoxidation of the polymer takes place. In some cases, only small changes could be observed in the shape of cyclic voltammograms taken in the “stability region” before and after overoxidation. In contrast to this, the impedance spectra recorded after overoxidation differed considerably from the impedance spectra of a freshly made electrode. Morphological changes of the polymer caused by overoxidation (degradation) could be detected by using the bending beam method.

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Acknowledgments

Financial support from the Hungarian Scientific Research Fund (grants OTKA-67994/OMFB-01078/2007, OTKA-PD75445) are gratefully acknowledged. The authors thank National Instruments Europe Ltd. for the donation of data acquisition cards.

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Authors and Affiliations

  1. Institute of Chemistry, Laboratory of Electrochemistry and Electroanalytical Chemistry, Eötvös Loránd University, Pázmány P. s. 1/A, 1117, Budapest, Hungary

    Mária Ujvári, Mihály Takács, Soma Vesztergom, Fanni Bazsó & Győző G. Láng

  2. Department of Atomic Physics, University of Technology and Economics, Budafoki út 8., 1111, Budapest, Hungary

    Ferenc Ujhelyi

Authors
  1. Mária Ujvári
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  2. Mihály Takács
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  3. Soma Vesztergom
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  4. Fanni Bazsó
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  5. Ferenc Ujhelyi
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  6. Győző G. Láng
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Correspondence to Győző G. Láng.

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Dedicated to Professor György Inzelt on occasion of his 65th birthday.

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Ujvári, M., Takács, M., Vesztergom, S. et al. Monitoring of the electrochemical degradation of PEDOT films on gold using the bending beam method. J Solid State Electrochem 15, 2341–2349 (2011). https://doi.org/10.1007/s10008-011-1472-y

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  • DOI: https://doi.org/10.1007/s10008-011-1472-y

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