A Cationic Diode Based on Asymmetric Nafion Film Deposits

Daping He, Elena Madrid, Barak D.B. Aaronson, Lian Fan, James Doughty, Klaus Mathwig, Alan M. Bond, Neil B. McKeown, Frank Marken

Research output: Contribution to journalArticleResearchpeer-review

29 Citations (Scopus)

Abstract

A thin film of Nafion, of approximately 5 μm thickness, asymmetrically deposited onto a 6 μm thick film of poly(ethylene terephthalate) (PET) fabricated with a 5, 10, 20, or 40 μm microhole, is shown to exhibit prominent ionic diode behavior involving cation charge carrier ("cationic diode"). The phenomenon is characterized via voltammetric, chronoamperometric, and impedance methods. Phenomenologically, current rectification effects are comparable to those observed in nanocone devices where space-charge layer effects dominate. However, for microhole diodes a resistive, a limiting, and an overlimiting potential domain can be identified and concentration polarization in solution is shown to dominate in the closed state.

Original languageEnglish
Pages (from-to)11272-11278
Number of pages7
JournalACS Applied Materials & Interfaces
Volume9
Issue number12
DOIs
Publication statusPublished - 29 Mar 2017

Keywords

  • desalination
  • ion channels
  • ion pump
  • nanofluidics
  • sensor
  • water

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