Conductivity enhancement in single-walled carbon nanotube bundles doped with K and Br

R. S. Lee, H. J. Kim, J. E. Fischer (), A. Thess and R. E. Smalley
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R. S. Lee: University of Pennsylvania
H. J. Kim: University of Pennsylvania
J. E. Fischer: University of Pennsylvania
A. Thess: Center for Nanoscale Science and Technology, Rice University
R. E. Smalley: Center for Nanoscale Science and Technology, Rice University

Nature, 1997, vol. 388, issue 6639, 255-257

Abstract: Abstract Single-walled carbon nanotubes (SWNTs), prepared by metal-catalysed laser ablation of graphite, form close-packed bundles or ‘ropes;1. These rope crystallites exhibit metallic behaviour above 50K (ref. 2), and individual tubes behave as molecular wires, exhibiting quantum effects at low temperatures3,4. They offer an all-carbon host lattice that, by analogy with graphite5 and solid C60 (ref. 6), might form intercalation compounds with interesting electronic properties, such as enhanced electrical conductivity and superconductivity. Multi-walled nanotube materials have been doped with alkali metals7 and FeCl3 (ref. 8). Here we report the doping of bulk samples of SWNTs by vapour-phase reactions with bromine and potassium—a prototypical electron acceptor and donor respectively. Doping decreases the resistivity at 300K by up to a factor of 30, and enlarges the region where the temperature coefficient of resistance is positive (the signature of metallic behaviour). These results suggest that doped SWNTs represent a new family of synthetic metals.

Date: 1997
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DOI: 10.1038/40822

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