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Related Experiment Videos

Functionalized multiwall carbon nanotube/gold nanoparticle composites.

Bumsu Kim1, Wolfgang M Sigmund

  • 1Department of Materials Science & Engineering, University of Florida, 225 Rhines Hall, P.O. Box 116400, Gainesville, Florida 32611, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 8, 2004
PubMed
Summary

Oxidative ultrasonication functionalizes multiwall carbon nanotubes (MWCNTs), enhancing their dispersability and stability. Positively charged gold nanoparticles can detect functional group locations on these MWCNTs.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Multiwall carbon nanotubes (MWCNTs) possess unique properties but require surface functionalization for specific applications.
  • Controlling the type and density of functional groups is crucial for tailoring MWCNT behavior in dispersions and composites.

Purpose of the Study:

  • To investigate the effect of oxidative ultrasonication on the functionalization of MWCNTs.
  • To determine how reaction time influences the development of functional groups, dispersability, and colloidal stability.
  • To explore the use of gold nanoparticles for characterizing functional group locations on MWCNTs.

Main Methods:

  • Chemical oxidation of MWCNTs using a sulfuric acid and nitric acid mixture with ultrasonication.
  • Varying reaction times to control the degree of functionalization.

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  • Characterization using zeta potential measurements for polyelectrolyte self-assembly.
  • High-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (EDX) for complex formation analysis.

    • Main Results:

    • Carboxylic acid group concentration on functionalized MWCNTs (fMWNTs) increased with oxidation time.
    • Enhanced colloidal stability in aqueous dispersions for fMWNTs treated longer than 4 hours.
    • Successful layer-by-layer self-assembly of polyelectrolytes demonstrated by zeta potential changes.
    • Complex formation between gold nanoparticles and fMWNTs, indicating functional group localization.

    Conclusions:

    • Oxidative ultrasonication is an effective method for functionalizing MWCNTs.
    • Reaction time significantly impacts the degree of functionalization and colloidal properties.
    • Positively charged gold nanoparticles can serve as probes to identify defect sites and functional groups on MWCNTs.