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Journal of Solid State Electrochemistry

, Volume 15, Issue 11–12, pp 2341–2349 | Cite as

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

  • Mária Ujvári
  • Mihály Takács
  • Soma Vesztergom
  • Fanni Bazsó
  • Ferenc Ujhelyi
  • Győző G. Láng
Original Paper

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.

Keywords

PEDOT Degradation Bending beam method Impedance Stress 

Notes

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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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Mária Ujvári
    • 1
  • Mihály Takács
    • 1
  • Soma Vesztergom
    • 1
  • Fanni Bazsó
    • 1
  • Ferenc Ujhelyi
    • 2
  • Győző G. Láng
    • 1
  1. 1.Institute of Chemistry, Laboratory of Electrochemistry and Electroanalytical ChemistryEötvös Loránd UniversityBudapestHungary
  2. 2.Department of Atomic PhysicsUniversity of Technology and EconomicsBudapestHungary

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