Broadband ac conductivity of conductor-polymer composites

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dc.contributor.authorConnor, Marco T.
dc.contributor.authorRoy, Saibal
dc.contributor.authorEzquerra, Tiberio A.
dc.contributor.authorBaltá Calleja, Francisco J.
dc.contributor.funderSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschungen
dc.contributor.funderMinisterio de Educación, Cultura y Deporteen
dc.contributor.funderEuropean Commissionen
dc.contributor.funderDirección General de Investigación Científica y Técnicaen
dc.date.accessioned2017-10-18T11:27:43Z
dc.date.available2017-10-18T11:27:43Z
dc.date.issued1998-01-15
dc.date.updated2017-10-13T12:19:13Z
dc.description.abstractThe electrical conductivity of a composite model system formed by highly structured carbon black (CB) filled, within an amorphous polymer, poly(ethylene terephtalate) composite is studied. The dc conductivity as a function of CB content follows a scaling law of the type σ∝(p−pc)t yielding for the percolation concentration, pc=0.011 and for the exponent, t=2.17. The analysis of the temperature dependence of the conductivity suggests that for temperatures larger than 45 K, conduction can be ascribed to thermal fluctuation induced tunneling of the charge carriers through the insulating layer of polymer separating two CB aggregates. At lower temperatures, conductivity becomes temperature independent, which is typical of conventional tunneling. The frequency dependence of the conductivity is also studied between dc and 109 Hz. By the introduction of a shift factor ap, a procedure for the construction of a master curve based on a “time-length equivalence principle” is proposed. Finally, a model is introduced to describe the frequency dependence of the conductivity of CB-filled composites based on the behavior of charge carriers placed in a fractal object.en
dc.description.sponsorshipDirección General de Investigación Científica y Técnica (Grant No. PB94-0049)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationConnor, M. T., Roy, S., Ezquerra, T. A., Baltá Calleja, F. J. (1998) 'Broadband ac conductivity of conductor-polymer composites', Physical Review B, 57(4), pp. 2286-2294. doi:10.1103/PhysRevB.57.2286en
dc.identifier.doi10.1103/PhysRevB.57.2286
dc.identifier.endpage2294en
dc.identifier.issn2469-9950
dc.identifier.issued4en
dc.identifier.journaltitlePhysical Review Ben
dc.identifier.startpage2286en
dc.identifier.urihttps://hdl.handle.net/10468/4907
dc.identifier.volume57en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rights© 1998, American Physical Society. All rights reserved.en
dc.subjectFractalen
dc.subjectElectricalen
dc.subjectConductivityen
dc.subjectCarbon blacken
dc.subjectCompositeen
dc.titleBroadband ac conductivity of conductor-polymer compositesen
dc.typeArticle (peer-reviewed)en
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