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Single-Step Electrochemical Functionalization of Double-Walled Carbon Nanotube (DWCNT) Membranes and the Demonstration of Ionic Rectification
Nanoscale Research Letters (2013)
  • Xin Zhan, University of Kentucky
  • Ji Wu, Georgia Southern University
  • Zhiqiang Chen, University of Kentucky
  • Bruce J. Hinds, University of Kentucky
Abstract

Carbon nanotube (CNT) membranes allow the mimicking of natural ion channels for applications in drug delivery and chemical separation. Double-walled carbon nanotube membranes were simply functionalized with dye in a single step instead of the previous two-step functionalization. Non-faradic electrochemical impedance spectra indicated that the functionalized gatekeeper by single-step modification can be actuated to mimic the protein channel under bias. This functional chemistry was proven by a highly efficient ion rectification, wherein the highest experimental rectification factor of ferricyanide was up to 14.4. One-step functionalization by electrooxidation of amine provides a simple and promising functionalization chemistry for the application of CNT membranes.

Keywords
  • Carbon nanotube membranes,
  • Rectification,
  • Voltage gatekeeper,
  • Amine electrooxidation
Disciplines
Publication Date
2013
Publisher Statement

© 2013 Zhan et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Article originally obtained from Nanoscale Research Letters.

Citation Information
Xin Zhan, Ji Wu, Zhiqiang Chen, and Bruce J. Hinds. "Single-Step Electrochemical Functionalization of Double-Walled Carbon Nanotube (DWCNT) Membranes and the Demonstration of Ionic Rectification" Nanoscale Research Letters 8.279 (2013). doi: 10.1186/1556-276X-8-279
Available at: http://works.bepress.com/ji_wu/42