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Article

Polyelectrolyte Diode: Nonlinear Current Response of a Junction between Aqueous Ionic Gels

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Olivier J. Cayre,^† Suk Tai Chang, and Orlin D. Velev*

Contribution from the Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905

J. Am. Chem. Soc., 2007, 129 (35), pp 10801–10806

DOI: 10.1021/ja072449z

Publication Date (Web): August 11, 2007

†

Present address: Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, University of Leeds, U.K.

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

, odvelev@unity.ncsu.edu

Abstract

We demonstrate that a fixed junction between two aqueous gels containing oppositely charged polyelectrolytes could rectify electric current. The agarose-based gels were “doped” with sodium poly(styrene sulfonic acid) and poly(diallyl dimethylammonium chloride). The unidirectional current response of the interface between the cationic and anionic gels originates directly from anisotropy in the mobile ionic charges in the gels. The current depends on the concentration of polyelectrolyte, the background ionic concentration, and the distance traveled by the ions. The I−V curves from the devices demonstrated a combination of transient and stationary rectification effects. The current densities achieved were comparable to or higher than those obtained with previously reported organic semiconductor diodes. The diodes had good long-term stability in both DC and AC conduction modes. The materials and the process of preparation of these devices are simple, inexpensive, and scalable. They could be used in flexible and biocompatible electronic circuits.

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Published In Issue September 05, 2007
Received April 7, 2007
Revised July 2, 2007

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Article

Polyelectrolyte Diode: Nonlinear Current Response of a Junction between Aqueous Ionic Gels

Abstract

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SciFinder Links

History

Recommend & Share

Related Content

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Evaporation-Induced Particle Microseparations inside Droplets Floating on a Chip

Ion Gel Gated Polymer Thin-Film Transistors

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