Nano Express

Nanoscale Research Letters

, 8:279

Open Access This content is freely available online to anyone, anywhere at any time.

Single-step electrochemical functionalization of double-walled carbon nanotube (DWCNT) membranes and the demonstration of ionic rectification

  • Xin ZhanAffiliated withDepartment of Chemistry, University of Kentucky
  • , Ji WuAffiliated withDepartment of Chemical and Materials Engineering, University of KentuckyDepartment of Chemistry, Georgia Southern University
  • , Zhiqiang ChenAffiliated withDepartment of Chemical and Materials Engineering, University of Kentucky
  • , Bruce J HindsAffiliated withDepartment of Chemistry, University of KentuckyDepartment of Chemical and Materials Engineering, University of Kentucky Email author 

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