Purification and size-selection of carbon nanotubes


  • We thank the Centre Interdepartemental de Microscopic Electronique (CIME) at EPFL for access to the electron microscopes, as well as Michel Fazan (IPE-EPFL) for technical support. This work was financially supported by the Swiss National Research Fund.


A non-destructive method for purifying carbon nanotubes produced by are discharge is described. The nanotubes, in the form of a kinetically stable colloidal dispersion in a water–surfactant solution, are separated from the nanoparticles by filtration. The Figure shows that purified nanotubes after two filtration steps. Through controlled flocculation, nanotube size election is also possible.

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