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Issue 19, 2017

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

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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.

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

Article information


Submitted
03 Jun 2017
Accepted
13 Aug 2017
First published
14 Aug 2017

This article is Open Access

Analyst, 2017,142, 3707-3714
Article type
Paper

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

B. D. B. Aaronson, D. Wigmore, M. A. Johns, J. L. Scott, I. Polikarpov and F. Marken, Analyst, 2017, 142, 3707 DOI: 10.1039/C7AN00918F

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