Volume 77, Number 3, February 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 January 2007|
Nitrogen doping of metallic single-walled carbon nanotubes: n-type conduction and dipole scattering
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
Accepted: 28 November 2006
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
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