title: Low temperature conductivity of carbon nanotube aggregates.
abstract: We compare, over wide temperature ranges, the transport properties of single-wall carbon nanotubes arranged in the form of aligned arrays or in the form of fibres. The experimental data show that both the forms of aggregates present a crossover in the transport mechanism from three-dimensional hopping of the electrons between localized states at high temperature to fluctuation-induced tunnelling across potential barriers at low temperature. The role of the junctions formed between the bundles in the array and between the nanotubes inside the fibres is discussed on the basis of the experimental results.
authors.affiliation: Dipartimento di Fisica and MINAS Laboratory, Università di Roma Tor Vergata, I-00133 Roma, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Salvato
authors.forename: M
authors.initials: M
authors.lastname: Lucci
authors.forename: I
authors.initials: I
authors.lastname: Ottaviani
authors.forename: M
authors.initials: M
authors.lastname: Cirillo
authors.forename: S
authors.initials: S
authors.lastname: Orlanducci
authors.forename: E
authors.initials: E
authors.lastname: Tamburri
authors.forename: V
authors.initials: V
authors.lastname: Guglielmotti
authors.forename: F
authors.initials: F
authors.lastname: Toschi
authors.forename: M L
authors.initials: ML
authors.lastname: Terranova
authors.forename: M
authors.initials: M
authors.lastname: Pasquali
mesh_terms: D004553:Electric Conductivity; D017097:Electric Impedance; D060328:Magnetic Phenomena; D037742:Nanotubes, Carbon; D013696:Temperature
chemical_list: D037742:Nanotubes, Carbon