Temperature-dependent diffusive to ballistic transport transition in aligned double walled carbon nanotubes in the high frequency regime

George Chimowa (1) , Emmanuel Flahaut (2) , Somnath Bhattacharyya (1)

1 WITS - University of the Witwatersrand [Johannesburg]
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Low-temperature induced diffusive to ballistic transport in aligned double walled carbon nanotubes (DWNT) is reported. This is evidenced by a crossover of the imaginary (reactive) component of the alternating current impedance being greater than the real (resistive) component, which happens in the range of 9 GHz–1.5 GHz at temperatures77K and 4K from which we estimate a long lifetime of 17 ps and 106 ps in DWNTs, respectively. By simulating the measured scattering parameters of a few aligned DWNTs over a wide temperature range, we show that this observation is strongly influenced by the electrode–DWNT coupling strength

Mots clés: Temperature-dependent diffusive; Ballistic transport; Carbon nanotubes; High frequency regime

Domaines: Matériaux

George Chimowa, Emmanuel Flahaut, Somnath Bhattacharyya. Temperature-dependent diffusive to ballistic transport transition in aligned double walled carbon nanotubes in the high frequency regime. Applied Physics Letters, 2014, 105 (17), pp.173511. ⟨10.1063/1.4901025⟩. ⟨hal-01447806⟩