Electrical transport properties of individual disordered multiwalled carbon nanotubes

Abstract

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 4.2–263K. 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.

Lüttinger Liquid to Al’tshuler−Aronov Transition in Disordered, Many-Channel Carbon Nanotubes

“…At higher temperatures, the pristine devices had large values of α (2 < α < 4 for most devices), unexpectedly high for single LL channels, but possible for sequential end−end tunneling of electrons across multiple LLs . Pristine devices were also found to have mean-free paths l e (≈τ 0 v F ) < 5 nm, and τ 0 ≈ 10 −15 s, in agreement with that reported in ref . However, no self-consistent solution could be obtained for N ≥ 1.…”

“…Mora et al . have recently given a unifying description (LL-AA model) of these two regimes, and the AA behavior was recently reported in highly disordered MWNTs . Using the LL-AA model, independent fits for the high- and low-temperature regimes (shown with solid and dashed lines in Figure C) were used to analyze our data.…”

“…Mora 10 et al have recently given a unifying description (LL-AA model) of these two regimes, and the AA behavior was recently reported in highly disordered MWNTs. 24 Using the LL-AA model, independent fits for the high-and lowtemperature regimes (shown with solid and dashed lines in Figure 1C) were used to analyze our data. At higher temperatures, the pristine devices had large values of ␣ (2 Ͻ ␣ Ͻ 4 for most devices), unexpectedly high for single LL channels, but possible for sequential endϪend tunneling of electrons across multiple LLs.…”

The effect of carbon nanotube aspect ratio and loading on the elastic modulus of electrospun poly(vinyl alcohol)-carbon nanotube hybrid fibers

“…Carbon nanotubes (CNTs), first observed in 1952 [1,2], display exceptional mechanical [3], thermal [4] and electrical [5] properties. Such features have motivated the use of CNTs as nanofillers in polymer matrices to form composite materials for various applications such as filters [6], field-emission displays [7], nanosensors [8], thermal interface materials [9] and for drug delivery [10].…”

Electrically-Conductive Composite Nanomaterial with Multi-Walled Carbon Nanotubes

“…We note that experimentally obtained specific conductivity of the layers is worse than calculated values 800 kS/m 20 MS/m   for individual SWCNT. The layers of buckypaper based on MWCNT also possess the high  about ~10 kS/m, and their electrical properties are highly dependent on many factors including the kind of MWCNT and the purification [9,10]. By now experimental layers of buckypaper with MWCNT are much inferior to the calculated values of the individual specific conductivity for MWCNT [11,12].…”