title: A Cationic Diode Based on Asymmetric Nafion Film Deposits.
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.
authors.affiliation: Department of Chemistry, University of Bath , Claverton Down, Bath BA2 7AY, U.K.
authors.forename: Daping
authors.initials: D
authors.lastname: He
authors.affiliation: Department of Chemistry, University of Bath , Claverton Down, Bath BA2 7AY, U.K.
authors.forename: Elena
authors.initials: E
authors.lastname: Madrid
authors.affiliation: Department of Chemistry, University of Bath , Claverton Down, Bath BA2 7AY, U.K.
authors.forename: Barak D B
authors.initials: BD
authors.lastname: Aaronson
authors.affiliation: Department of Biology and Biochemistry, University of Bath , Claverton Down, Bath BA2 7AY, U.K.
authors.forename: Lian
authors.initials: L
authors.lastname: Fan
authors.affiliation: Department of Biology and Biochemistry, University of Bath , Claverton Down, Bath BA2 7AY, U.K.
authors.forename: James
authors.initials: J
authors.lastname: Doughty
authors.affiliation: Pharmaceutical Analysis, Groningen Research Institute of Pharmacy, University of Groningen , P.O. Box 196, 9700 AD Groningen, The Netherlands.
authors.forename: Klaus
authors.initials: K
authors.lastname: Mathwig
authors.affiliation: Monash University , School of Chemistry, Clayton, Vic 3800, Australia.
authors.forename: Alan M
authors.initials: AM
authors.lastname: Bond
authors.affiliation: EastChem School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh, EH9 3FJ, U.K.
authors.forename: Neil B
authors.initials: NB
authors.lastname: McKeown
authors.affiliation: Department of Chemistry, University of Bath , Claverton Down, Bath BA2 7AY, U.K.
authors.forename: Frank
authors.identifier: http://orcid.org/0000-0003-3177-4562
authors.initials: F
authors.lastname: Marken
keywords: desalination; ion channels; ion pump; nanofluidics; sensor; water