Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)


Accueil > La Recherche > Axes & Equipes > Nanostructures & Spectroscopies > Equipe : Nanomatériaux > Thème : Dopage, confinement et fonctionnalisation dans les nanotubes

Nitrogen doping of carbon nanotubes

par Sébastien LAYSSAC - publié le

Involved researchers : J.L. Bantignies, L. Alvarez, R. Baaba
Collaboration : B. Doyle - ELECTRA (Trieste, Italie), A. Loiseau - LEM, ONERA, F. Lenormand - IPCMS Strasbourg, Ph. Parent - LCPMR Orsay, O. Stéphan - LPS Orsay

The electronic properties of undoped carbon nanotubes can be either semiconducting or metallic, depending on their chirality. Doping carbon nanotubes with nitrogen or boron could be a particularly interesting way for tuning their electronic properties. This has led to an increasing interest in preparing doped carbon nanotubes. For instance, N-doped nanotubes show n-type behavior regardless of a tube chirality
In our group, the nitrogen doping of carbon nanotubes is both investigated by high energy resolution NEXAFS and spatial resolved EELS (collaboration with LPS). Most of the tubes appear to be N-doped. In addition different electronic structures of nitrogen are clearly evidenced (pyridine-like, and pyrollic-like). High resolution NEXAFS experiments show that most of the nitrogen atomic content of N-MWNT seems to arise from "molecular N2 encapsulated" inside the tubes in a small fraction of the N-MWNT (G feature on figure 1).

Figure 1 : N K-edge NEXAFS spectra of multi-walled CNx nanotubes - © L2C

S. Enouz et al. J. Nanosci. Nanotechnol. 7 (2007)