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2013-09-04 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

(Invited) ., Scardamaglia Mattia , Aparicio Rebollo Francisco, Aleman Llorente Belen, Amati Matteo, Struzzi Claudia , Mudimela P., Colomer Jean-François, Petaccia Luca, Gregoratti Luca, Snyders Rony , Bittencourt Carla , "Plasma-based nitrogen functionalization of vertically aligned carbon nanotubes: tips and side walls photoemission response" in Recent Advances in Spectro­microscopy: Experimental and Theoretical Tools, Mons, Belgique, 2013

  • 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 [1]. 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 [2]. Within this context, we present core level X-ray photoelectron spectroscopy (XPS) and scanning X-ray photoelectron spectromicroscopy (SPEM) 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 4 µm 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 a different reactivity of the CNT tip, directly exposed to plasma, where the presence of natural defects may be involved in different bonding formations between carbon and nitrogen.

Notes :
  • (Anglais) Invited talk