Unexpected interaction between PEDOT and phosphonium ionic liquids

Vanessa Armel, Jonathan Rivnay, George Malliaras, Bjorn Winther Jensen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


In-situ-polymerized films of poly(3,4-ethylenedioxythiophene) (PEDOT) are known to be relatively ordered materials and maintain this order under changing chemical and electrochemical conditions. It is therefore surprising that certain ionic liquids (ILs) were found to interact with PEDOT and thereby to a large extent disrupt the ordered structure. The current work demonstrates the expansion of the interlayer distance (d100) of PEDOT and the composite of PEDOT with poly(ethyleneglycol) (PEDOT(PTS):PEG) in the presence of IL mixtures containing triisobutylmethylphosphonium tosylate (P 1444PTS) and water. In presence of the mixtures, the PEDOT(PTS):PEG film expands up to ∼100% while the PEDOT(PTS) film expanded ∼50%. The expansion did not increase the electrical resistance but increased the absorption in the π-π* range, which can be explained by increased shielding of the PEDOT chains by the IL. The incorporation of P 1444PTS increased the capacitance by 350%, compared to the theoretical capacitance of PEDOT(PTS), due to the formation of additional double-layer capacitance.

Original languageEnglish
Pages (from-to)11309-11313
Number of pages5
JournalJournal of the American Chemical Society
Issue number30
Publication statusPublished - 2013 Jul 31
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry


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