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Related Experiment Video

Updated: Jun 7, 2026

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
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Chemically grafted carbon nanotube surface coverage gradients.

Cameron J Shearer1, Amanda V Ellis, Joseph G Shapter

  • 1Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, South Australia 5042.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 28, 2010
PubMed
Summary

Researchers developed two methods to create gradients of vertically aligned single-walled carbon nanotubes (SWCNTs) on silicon. Both methods show that decreasing surface features leads to lower SWCNT coverage, optimizing SWCNT density for various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Vertically aligned single-walled carbon nanotubes (SWCNTs) offer unique properties for advanced applications.
  • Controlling SWCNT density and alignment on surfaces is crucial for optimizing their performance.
  • Chemical grafting provides a versatile method for surface functionalization and nanomaterial immobilization.

Purpose of the Study:

  • To present two distinct chemical grafting approaches for creating gradients of vertically aligned SWCNTs on silicon surfaces.
  • To investigate the relationship between surface characteristics (topography and chemical functionality) and SWCNT coverage.
  • To establish gradient platforms for efficient optimization of SWCNT density for diverse applications.

Main Methods:

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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures
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Published on: July 2, 2012

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Last Updated: Jun 7, 2026

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
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  • Fabrication of a porous silicon (pSi) substrate with a pore size gradient, followed by functionalization with 3-aminopropyltriethoxysilane (APTES).
  • Immobilization of carboxylated SWCNTs onto the pSi topography gradient using carbodiimide coupling.
  • Creation of an amine-functionality gradient on a silicon wafer via vapor-phase diffusion of APTES.
  • Immobilization of carboxylated SWCNTs onto the amine-terminated silicon gradient using carbodiimide coupling.

    • Main Results:

    • A decreasing trend in SWCNT coverage was observed with increasing pSi pore size and porosity.
    • SWCNT coverage decreased proportionally with decreasing APTES density on the silicon surface.
    • Both gradient approaches demonstrated a clear correlation between surface properties and SWCNT immobilization.

    Conclusions:

    • The developed gradient platforms enable effective control over SWCNT coverage on silicon surfaces.
    • These platforms facilitate time-efficient optimization of SWCNT density for applications like field emission, water filtration, and drug delivery.
    • The findings provide a foundation for designing tailored SWCNT-based devices through controlled surface modification.