Frequency- and electric-field-dependent conductivity of single-walled carbon nanotube networks of varying density

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dc.creatorXu, Hua
dc.creatorHu, Liangbing
dc.creatorZhang, Shixiong
dc.creatorGruner, George
dc.creatorAnlage, Steven M.
dc.date2007-12-11
dc.date2008-02-22
dc.date.accessioned2026-07-07T09:22:13Z
dc.date.available2026-07-07T09:22:13Z
dc.descriptionWe present measurements of the frequency and electric field dependent conductivity of single walled carbon nanotube(SWCNT) networks of various densities. The ac conductivity as a function of frequency is consistent with the extended pair approximation model and increases with frequency above an onset frequency $ω_0$ which varies over seven decades with a range of film thickness from sub-monolayer to 200 nm. The nonlinear electric field-dependent DC conductivity shows strong dependence on film thickness as well. Measurement of the electric field dependence of the resistance R(E) allows for the determination of a length scale $L_{E}$ possibly characterizing the distance between tube contacts, which is found to systematically decrease with increasing film thickness. The onset frequency $ω_0$ of ac conductivity and the length scale $L_{E}$ of SWCNT networks are found to be correlated, and a physically reasonable empirical formula relating them has been proposed. Such studies will help the understanding of transport properties and benefit the applications of this material system.
dc.description7 pages and 6 figures
dc.identifierhttps://arxiv.org/abs/0712.1733
dc.identifierhttp://arxiv.org/abs/0712.1733
dc.identifierPhysical Review B 77, 075418 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.075418
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155299
dc.subjectMaterials Science
dc.subjectDisordered Systems and Neural Networks
dc.titleFrequency- and electric-field-dependent conductivity of single-walled carbon nanotube networks of varying density
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