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Keywords:

  • conducting polymers;
  • electroactive polymer;
  • electrochemistry;
  • ion mobility;
  • ionic liquid;
  • morphology

Abstract

Electrochemical quartz crystal microgravimetry was used to study movement of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIBTI) into and out of poly(3,4-ethylenedioxythiophene) (PEDOT). In 0.1M EMIBTI/acetonitrile, anionic transport predominates, as is typical of solution-based electrolytes. In pure EMIBTI, on the other hand, the minimal mass change observed during polymer oxidation/reduction was observed to be cation-dominant. PEDOT deposition from dilute EMIBTI solution followed by cycling in neat EMIBTI resulted in rapid decrease of electroactivity. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013