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2014-02-13 - Colloque/Présentation - poster - Anglais - 1 page(s)

Scardamaglia Mattia, Aparicio Rebollo F.J., Struzzi Claudia, Mudimela P., Colomer J. F, Amati M., Gregoratti L., Petaccia L., Snyders Rony , Bittencourt Carla , "Nitrogen Plasma functionalization of vertically aligned carbon nanotubes" in Towards Reality in Nanoscale Materials VII, Levi, Finland, 2014

  • Codes CREF : Physique (DI1200), Physique des plasmas (DI1233)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)

Abstract(s) :

(Anglais) The electronic properties of sp2 carbon nanostructures are very sensitive to local perturbations, such as surface charges and adsorbed gas molecules, so that the grafting of functional groups in a controllable way has been proposed as a feasible reproducible solution for band gap engineering and controllable doping, in order to exploit and tailor the extraordinary properties of these materials. Plasma-based functionalization methods have the advantage to be solvent-free, time efficient and flexible; in particular nitrogen is a natural choice of dopant for carbon nanostructures since its atomic radius is similar to that of carbon. Within this context, we present scanning X-ray photoelectron spectromicroscopy (SPEM), core level X-ray and ultra-violet photoelectron spectroscopy (XPS and UPS) measurements on nitrogen functionalized vertically aligned carbon nanotubes (v-CNTs). The creation of defects induced by ions drives the grafting of nitrogen species (pyridinic, pyrrolic and graphitic) at the CNT surface. A depth of functionalization of about 4µm was evaluated by SPEM, beyond which the properties of the v-CNTs remain unperturbed. Furthermore, an intriguing different behavior of the grafting at the CNT tips with respect to the sidewall was observed. These differences indicate the peculiar reactivity of the CNT tip, directly exposed to plasma, where the presence of natural defects may be involved in several bonding formations between carbon and nitrogen. Upon annealing a trasformation of the nitrogen species has been observed both in valence band and in the carbon and nitrogen 1s core levels.


Mots-clés :
  • (Anglais) electronic properties
  • (Anglais) Nitrogen plasma
  • (Anglais) synchrotron spectroscopies
  • (Anglais) carbon nanostructures