Issue
EPL
Volume 77, Number 3, February 2007
Article Number 37001
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/77/37001
Published online 23 January 2007
EPL, 77 (2007) 37001
DOI: 10.1209/0295-5075/77/37001

Nitrogen doping of metallic single-walled carbon nanotubes: n-type conduction and dipole scattering

V. Krstic1, 2, G. L. J. A. Rikken1, P. Bernier3, S. Roth4 and M. Glerup5, 3

1  Laboratoire National des Champs Magnétiques Pulsés CNRS/INSA/UPS - B.P. 14245, F-31400 Toulouse, France
2  Grenoble High Magnetic Field Laboratory CNRS - B.P. 166, F-38042 Grenoble, France
3  LCVN (UMR5587), Université Montpellier II - Pl. E. Bataillon, F-34095 Montpellier, France
4  Max-Planck-Institut für Festkörperforschung - Heisenbergstr. 1, D-70569 Stuttgart, Germany
5  Department of Chemistry, University of Oslo - P.O. Box 1033 Blindern, N-0135 Oslo, Norway


received 21 June 2006; accepted in final form 28 November 2006; published February 2007
published online 23 January 2007

Abstract
The charge transport properties of individual, metallic nitrogen doped, single-walled carbon nanotubes are investigated. It is demonstrated that n-type conduction can be achieved by nitrogen doping. Evidence was obtained by appealing to electric-field effect measurements at ambient condition. n-type conduction is attributed to the presence of graphite-type nitrogen. The observed temperature dependencies of the zero-bias conductance indicate a disordered electron system with electric-dipole scattering, caused mainly by pyridine-type nitrogen atoms in the honeycomb lattice.

PACS
73.22.-f - Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals .
73.63.Fg - Nanotubes .
73.21.-b - Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems .

© Europhysics Letters Association 2007