Well-defined single-walled carbon nanotube fibers as quantum wires: Ballistic conduction over micrometer-length scales

Research areas:
  • Uncategorized
Year: 2011
Type of Publication: Article
  • R. Maruyama, J. -H Han Y. W. Nam
Journal: Current Applied Physics Volume: 11
Number: 6
Month: NOV 2011
PT: J; TC: 0; UT: WOS:000294290300031
We report quasi-ballistic conduction in single-walled carbon nanotube (SWNT) fibers at room temperature, with a measured mean free path of 1.0-2.6 mu m. The dynamic submersion of vertical SWNT fibers into liquid mercury (Hg) electrode shows plateaus and steps indicative of quasi-ballistic electron transport. This response is described with a newly developed network model that uses surface impurities to simplify the parallel conducting channels. The quasi-ballistic SWNT fibers exhibit a resistance per unit length of 2.5-6.5 k Omega/mu m and a mean free path exceeding 1 mu m, a length longer than typical via dimensions in existing Si-chip technologies. These results highlight that SWNT fiber conductivity can be enhanced by increasing the metallic to semiconducting SWNT ratio and reducing the surface impurities. (C) 2011 Elsevier B.V. All rights reserved.