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Related Experiment Video

Updated: Jul 20, 2026

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
09:09

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes

Published on: December 15, 2015

Aligned multiwalled carbon nanotube membranes.

Bruce J Hinds1, Nitin Chopra, Terry Rantell

  • 1Department of Chemical and Materials Engineering, University of Kentucky, Lexington KY 40506, USA. bjhinds@engr.uky.edu

Science (New York, N.Y.)
|December 3, 2003
PubMed
Summary

Aligned carbon nanotube membranes offer tunable nanoporous structures for selective molecular transport. Functionalized membranes demonstrate gating capabilities for chemical separations and sensing applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Development of ordered nanoporous membranes is crucial for advanced separation and sensing technologies.
  • Carbon nanotubes (CNTs) offer unique properties for creating precise nanoscale channels.
  • Controlling pore dimensions and surface chemistry is key to tailoring membrane performance.

Purpose of the Study:

  • To create and characterize a well-ordered nanoporous membrane using aligned carbon nanotubes (CNTs) within a polymer film.
  • To investigate methods for tuning the pore length and functionalizing the CNTs for controlled molecular transport.
  • To demonstrate the potential of these functionalized membranes for selective molecular gating.

Main Methods:

  • Incorporation of aligned CNTs into a polymer film to form a nanoporous structure.
Keywords:
Non-programmatic

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  • Characterization using electron microscopy, electrical conductivity, gas, and ionic transport measurements.
  • Selective electrochemical oxidation for tunable pore length reduction.
  • Functionalization of CNT tips with biotin for molecular binding studies.

    • Main Results:

    • The membrane structure exhibited anisotropic electrical conductivity and controlled gas/ionic transport consistent with Knudsen diffusion through CNTs.
    • Electrochemical oxidation successfully reduced CNT lengths, enabling tunable pore dimensions.
    • Functionalization with biotin allowed for significant (15-fold) reduction in Ru(NH3)6(3+) flux upon streptavidin binding, demonstrating molecular gating.

    Conclusions:

    • Aligned CNT membranes provide a versatile platform for creating tunable nanoporous structures.
    • Surface functionalization of CNTs enables precise control over molecular transport through the membrane.
    • These functionalized CNT membranes show significant promise for applications in selective chemical separations and biosensing.