Intrinsically microporous polyamines (PIM-EA-TB) provide tertiary amine binding sites for protons and in this way allow switching/gating from a low ionic conductivity state to semipermeable anion conductivity through micropores. In ethanolic NaClO 4 media ionic conductivity in PIM-EA-TB films (approx. 10 μm thick; deposited asymmetrically onto a 10 μm diameter microhole in 5 μm thick Teflon) is lowered by ion exclusion compared to conductivity observed in aqueous environments. However, in the presence of protons in ethanol PIM-EA-TB films are shown to switch from essentially insulating to anionic diode behaviour. Similar observations are reported for Cu 2+ but not for other types of cations such as Na +, K +, Mg 2+ (all as perchlorate salts). Binding constants are evaluated, and protonation is identified to cause gating for both H + and Cu 2+. Both chemical and electrochemical gating/switching is demonstrated by placing a platinum electrode close to the PIM-EA-TB film and applying positive or negative bias to locally generate acid/base.

Original languageEnglish
Article number116751
JournalJournal of Electroanalytical Chemistry
Early online date29 Aug 2022
Publication statusPublished - 1 Oct 2022


  • Electroosmosis
  • Ion transport
  • Ionics
  • Membrane
  • Rectification
  • Solvent

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry


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