Cellulose ionics: switching ionic diode responses by surface charge in reconstituted cellulose films

Barak Aaronson, David Wigmore, Marcus Johns, Janet Scott, Igor Polikarpov, Frank Marken

Research output: Contribution to journalArticle (Academic Journal)peer-review

211 Downloads (Pure)

Abstract

Cellulose films as well as chitosan-modified cellulose films of approximately 5 μm thickness, reconstituted from ionic liquid media onto a poly(ethylene-terephthalate) (PET, 6 μm thickness) film with a 5, 10, 20, or 40 μm diameter laser-drilled microhole, show significant current rectification in aqueous NaCl. Reconstituted α-cellulose films provide “cationic diodes” (due to predominant cation conductivity) whereas chitosan-doped cellulose shows “anionic diode” effects (due to predominant anion conductivity). The current rectification, or “ionic diode” behaviour, is investigated as a function of NaCl concentration, pH, microhole diameter, and molecular weight of the chitosan dopant. Future applications are envisaged exploiting the surface charge induced switching of diode currents for signal amplification in sensing.
Original languageEnglish
Pages (from-to)3707-3714
Number of pages8
JournalAnalyst
Volume142
Issue number19
Early online date13 Aug 2017
DOIs
Publication statusPublished - 7 Oct 2017

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