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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Tuning the electrical transport properties of double-walled carbon nanotubes by semiconductor and semi-metal filling
Journal of Applied Physics, Volume 110, No. 12, Article 123708, Year 2011
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Description
Manipulating the electrical properties of carbon nanotubes through semi-metal or semiconductor filling is of paramount importance in the realization of nano-electronic devices based on one dimensional composite materials. From low temperature electrical conductivity measurements of a network, of empty and filled double-walled carbon nanotubes (DWNT's), we report a transition in electrical transport features from hopping to weakly activated conduction by HgTe filling and also semi-metallic conduction in selenium (Se) filled DWNT's. Magneto-resistance (MR) studies of the filled DWNT's show suppression of the hopping conduction and a signature of 3D weak localization for Se@DWNT's at low temperatures and high magnetic fields. These results are discussed on the basis of strength of interaction between the filler material and the inner-walls of the host DWNT's, which enhances the electronic density of states (DOS) in the material as well as the change in the property of the filler material due to constrained encapsulation. © 2011 American Institute of Physics.
Authors & Co-Authors
Chimowa, George
South Africa, Johannesburg
University of the Witwatersrand
Sendova, M. S.
United States, Sarasota
New College of Florida
Flahaut, Emmanuel
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Churochkin, Dmitry V.
South Africa, Johannesburg
University of the Witwatersrand
Bhattacharyya, Somnath
South Africa, Johannesburg
University of the Witwatersrand
Statistics
Citations: 9
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1063/1.3670879
ISSN:
00218979
Research Areas
Environmental