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Electrical transport properties of individual disordered multiwalled carbon nanotubes

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9 Author(s)
Tsai, Meng-Yen ; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan ; Yu, Chung-Yi ; Yang, Chien-Hsin ; Tai, Nyan-Hwa
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The electrical transport properties of individual disordered multiwalled carbon nanotubes (MWCNTs), synthesized with the floating catalyst method, have been investigated. The resistivity of such disordered MWCNTs shows T1/2 dependence over a temperature range of 4.2–263 K. The experimental finding can be interpreted in terms of Al’tshuler-Aronov model [Solid State Commun. 30, 115 (1979); Sov. Phys. JETP 50, 968 (1979); Pis’ma. Zh. Eksp. Teor. Fiz. 27, 700 (1978)], in which strong electron-electron interaction leads to a Coulomb gap in the density of electronic states at the Fermi level. Such a wide fitting range of temperature for T1/2 dependence has never been reported for other materials, implying an extremely short carrier scattering time of the order of femtoseconds.

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Applied Physics Letters  (Volume:89 ,  Issue: 19 )