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Rectification of the Ionic Current through Carbon Nanotubes by Electrostatic Assembly of Polyelectrolytes

Published

Author(s)

Neal R. Scruggs, Joseph W. Robertson, John J. Kasianowicz, Kalman D. Migler

Abstract

Rectification of the ionic current flowing through nanotubes embedded in a polymeric membrane is achieved by selective adsorption of polycations to the nanotubes mouths. A one-dimensional model of ionic flux through a nanotube with charged entrance regions qualitatively describes current-voltage curves before and after polycation exposure; reversal potential measurements confirm that charge reversal takes place upon polycation adsorption. The inherent simply of this electrostatic approach makes it attractive in membrane and nanofluidic applications employing rectification.
Citation
Nano Letters
Volume
9
Issue
11

Keywords

ionic, rectification, nanotubes, nanofluidics
Created September 16, 2009, Updated February 19, 2017