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Well-defined single-walled carbon nanotube fibers as quantum wires: Ballistic conduction over micrometer-length scales |
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| Authors: | R Maruyama YW Nam J-H Han MS Strano |
| Institution: | aAdvanced Materials Laboratories, Sony Corporation, 4-16-1 Okata, Atsugi, Kanagawa 243-0021, Japan;bDepartment of Energy IT, Kyungwon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 461-701, Republic of Korea;cDepartment of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA |
| Abstract: | 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 μm. 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 kΩ/μm and a mean free path exceeding 1 μm, 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. |
| Keywords: | Single-walled carbon nanotubes Carbon nanotube fiber Conductance Quasi-ballistic transport |
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