Broadband ac conductivity of conductor-polymer composites

Show simple item record Connor, Marco T. Roy, Saibal Ezquerra, Tiberio A. Baltá Calleja, Francisco J. 2017-10-18T11:27:43Z 2017-10-18T11:27:43Z 1998-01-15
dc.identifier.citation Connor, 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.57.2286 en
dc.identifier.volume 57 en
dc.identifier.issued 4 en
dc.identifier.startpage 2286 en
dc.identifier.endpage 2294 en
dc.identifier.issn 2469-9950
dc.identifier.doi 10.1103/PhysRevB.57.2286
dc.description.abstract The 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.sponsorship Dirección General de Investigación Científica y Técnica (Grant No. PB94-0049) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Physical Society en
dc.rights © 1998, American Physical Society. All rights reserved. en
dc.subject Fractal en
dc.subject Electrical en
dc.subject Conductivity en
dc.subject Carbon black en
dc.subject Composite en
dc.title Broadband ac conductivity of conductor-polymer composites en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Saibal Roy, Tyndall Microsystems, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en 2017-10-13T12:19:13Z
dc.description.version Published Version en
dc.internal.rssid 259773724
dc.contributor.funder Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung en
dc.contributor.funder Ministerio de Educación, Cultura y Deporte en
dc.contributor.funder European Commission en
dc.contributor.funder Dirección General de Investigación Científica y Técnica en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Physical Review B en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress en

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