Dynamics of simultaneous, single ion transport through two single-walled carbon nanotubes: Observation of a three-state system

Wonjoon Choi, Chang Young Lee, Moon Ho Ham, Steven Shimizu, Michael S. Strano

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The ability to actively manipulate and transport single molecules in solution has the potential to revolutionize chemical synthesis and catalysis. In previous work, we developed a nanopore platform using the interior of a single-walled carbon nanotube (diameter = 1.5 nm) for the Coulter detection of single cations of Li+, K+, and Na+. We demonstrate that as a result of their fabrication, such systems have electrostatic barriers present at their ends that are generally asymmetric, allowing for the trapping of ions. We show that above this threshold bias, traversing the nanopore end is not rate-limiting and that the pore-blocking behavior of two parallel nanotubes follows an idealized Markov process with the electrical potential. Such nanopores may allow for high-throughput linear processing of molecules as new catalysts and separation devices.

Original languageEnglish
Pages (from-to)203-205
Number of pages3
JournalJournal of the American Chemical Society
Volume133
Issue number2
DOIs
Publication statusPublished - 2011 Jan 19

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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