Ionic Diode Characteristics at a Polymer of Intrinsic Microporosity (PIM) | Nafion “Heterojunction” Deposit on a Microhole Poly(ethylene-terephthalate) Substrate

Budi Riza Putra, Barak D.B. Aaronson, Elena Madrid, Klaus Mathwig, Mariolino Carta, Richard Malpass-evans, Neil B. Mckeown, Frank Marken

Research output: Contribution to journalArticle

5 Citations (Scopus)


Ionic diode phenomena occur at asymmetric ionomer | aqueous electrolyte microhole interfaces. Depending on the applied potential, either an “open” or a “closed” diode state is observed switching between a high ion flow rate and a low ion flow rate. Physically, the “open” state is associated mainly with conductivity towards the microhole within the ionomer layer and the “closed” state is dominated by restricted diffusion-migration access to the microhole interface opposite to the ionomer. In this report we explore a “heterojunction” based on an asymmetric polymer of intrinsic microporosity (PIM) | Nafion ionomer microhole interface. Improved diode characteristics and current rectification are observed in aqueous NaCl. The effects of creating the PIM | Nafion micro-interface are investigated and suggested to lead to novel sensor architectures.

Original languageEnglish
Pages (from-to)2217-2223
Number of pages7
Issue number10
Early online date27 Jun 2017
Publication statusPublished - 1 Oct 2017



  • desalination
  • ionic diode
  • Ionomer
  • nanofluidics
  • polymer interface
  • voltammetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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