An efficient method for the carboxylation of few-wall carbon nanotubes with little damage to their sidewalls Articles uri icon

publication date

  • July 2013

start page

  • 499

end page

  • 507

issue

  • 2-3

volume

  • 140

international standard serial number (ISSN)

  • 0254-0584

abstract

  • We report a novel method that is able to efficiently functionalize carbon nanotubes (few-walled: from 1 to 6 layers and multiwalled) with a high yield of carboxyl groups, based on treatments with H2O2 in the presence of UV light. The amount of carboxylic groups was quantified by X-ray photoelectron spectroscopy and back-titration, showing both measurements reasonable agreement. According to the zeta potential values and to the amount of suspended nanotubes, we demonstrate that the method is able to produce uniform and stable suspensions of carbon nanotubes in water. With the aid of scanning and transmission electron microscopy, thermogravimetric analysis, and Raman spectroscopy, we show that the surfaces of the tubes are not damaged by the treatment and that the functionalized tubes have an enhanced reactivity toward oxygen. This route is efficient and could now be used to fabricate polymer composites using few-walled and multiwalled carbon nanotubes.

keywords

  • Polymers
    Composite Materials
    Magnetic Materials
    Nanostructures
    Electrical Conductivity
    Dielectric Properties