Open Access Nano Express

Boron and Nitrogen Doped Single walled Carbon Nanotubes as Possible Dilute Magnetic Semiconductors

Frank J Owens

Author Affiliations

Armament Research, Development and Engineering Ctr., Picatinny, NJ, 07806, USA

Department of Physics, Hunter College, CUNY, 959 Park Ave, New York, NY, 10021, USA

Nanoscale Research Letters 2007, 2:447-449  doi:10.1007/s11671-007-9082-4

Published: 10 August 2007

Abstract

The structure of single walled armchair and zig-zag carbon nanotubes having 70 atoms and two carbons replaced by boron or nitrogen is obtained at minium energy using HF/6-31G* molecular orbital theory. The calculations show that the ground state of the zig-zag tubes is a triplet state while for the armchair tubes it is a singlet. In the zig-zag tubes the density of states at the Fermi level is greater for the spin down states compared to the spin up state indicating that the doped tubes could be ferromagnetic.

Keywords:
Carbon nanotubes; Dilute magnetic semiconductors; Boron; Nitrogen