Origin of giant ionic currents in carbon nanotube channels

Pei Pang, Jin He, Jae Hyun Park, Predrag S. Krstić, Stuart Lindsay

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

Fluid flow inside carbon nanotubes is remarkable: transport of water and gases is nearly frictionless, and the small channel size results in selective transport of ions. Very recently, devices have been fabricated in which one narrow single-walled carbon nanotube spans a barrier separating electrolyte reservoirs. Ion current through these devices is about 2 orders of magnitude larger than predicted from the bulk resistivity of the electrolyte. Electroosmosis can drive these large excess currents if the tube both is charged and transports anions or cations preferentially. By building a nanofluidic field-effect transistor with a gate electrode embedded in the fluid barrier, we show that the tube carries a negative charge and the excess current is carried by cations. The magnitude of the excess current and its control by a gate electrode are correctly predicted by the Poisson-Nernst-Planck-Stokes equations.

Original languageEnglish (US)
Pages (from-to)7277-7283
Number of pages7
JournalACS nano
Volume5
Issue number9
DOIs
StatePublished - Sep 27 2011

Keywords

  • carbon nanotube
  • electroosmosis
  • ionic field effect transistor
  • nanochannel
  • nanofluidics
  • nanopore

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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