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Journal of Nanomaterials
Volume 2013, Article ID 713475, 6 pages
Research Article

Electromagnetic Properties of Inner Double Walled Carbon Nanotubes Investigated by Nuclear Magnetic Resonance

1Design Nano Applications Division (DNA), Research & Development Center, Saudi Aramco, Dhahran 31311, Saudi Arabia
2nanoNMRI group, UMR5587, University of Montpellier II, 34095 Montpellier, France
3KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
4Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA19104, USA
5Department of Physics, Umeå University, 901 87 Umeå, Sweden

Received 18 July 2013; Accepted 30 September 2013

Academic Editor: Tianxi Liu

Copyright © 2013 M. Bouhrara et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The nuclear magnetic resonance (NMR) analytical technique was used to investigate the double walled carbon nanotubes (DWNTs) electromagnetic properties of inner walls. The local magnetic and electronic properties of inner nanotubes in DWNTs were analyzed using 25% 13C enriched C60 by which the effect of dipolar coupling could be minimized. The diamagnetic shielding was determined due to the ring currents on outer nanotubes in DWNTs. The NMR chemical shift anisotropy (CSA) spectra and spin-lattice relaxation studies reveal the metallic properties of the inner nanotubes with a signature of the spin-gap opening below 70 K.