Influence of NiCr/Au electrodes and multilayer thickness on the electrical properties of PANI/PVS ultrathin film grown by Lbl deposition.

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dc.contributor.authorSantos, Mirela de Castro
dc.contributor.authorMunford, Maximiliano Luis
dc.contributor.authorBianchi, Rodrigo Fernando
dc.date.accessioned2015-02-24T18:28:00Z
dc.date.available2015-02-24T18:28:00Z
dc.date.issued2012
dc.description.abstractIn the present work, we concentrate on the study of effects of metallic electrodes, multilayer thickness and temperature in ac and dc electrical conductivity of polyaniline/poly(vinyl sulfonic acid) (PANI/PVS) ultrathin films. The polymer system was obtained from layer-by-layer (Lbl) self-assembly technique on a glass substrate with an electrode array of adhesion layer of NiCr (20 nm) covered with Au (180 nm). We observed a significant and abrupt increase in the value of dc conductivity and a change of ac conductivity behavior of NiCr/Au–PANI/PVS–NiCr/Au structure when the thickness of PANI/PVS system reaches the Au layer. These effects were ascribed to the ideal contact of Au–PANI/PVS and the relative high interfacial contact resistance between PANI/PVS and NiCr,thus reducing the parallel resistance of NiCr/Au–PANI/PVS interfacial layer in an ideal parallel plate capacitor structure. Atomic Force Microscopy images confirm this assumption. Furthermore, the ac conductivity of Au–PANI/PVS–Au structure was typical of solid disordered materials. A model based on carrier hopping in a medium with randomly varying energy barriers was presented for the ac conductivity of the polymer system, which also encompasses the high dielectric constant of PANI/PVS blended films, the neutral contact Au–PANI/PVS, and the electrical resistance of NiCr–PANI/PVS interfacial layer. The model allowed separating the interface and the bulk effects in the electrical response of NiCr/Au–PANI/PVS–NiCr/Au structure and in addition the highest activation energy (35 MeV) correlated with an optimization of hopping distance (30 nm) for carriers jumps in PANI/PVS system.pt_BR
dc.identifier.citationSANTOS, M. de C.; MUNFORD, M. L.; BIANCHI, R. F. Influence of NiCr/Au electrodes and multilayer thickness on the electrical properties of PANI/PVS ultrathin film grown by Lbl deposition. Materials Science & Engineering. B, Solid-State Materials for Advanced Technology, v. 177, p. 366-6, 2012. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0921510711005769>. Acesso em: 23 fev. 2015.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.mseb.2011.12.039
dc.identifier.issn0921-5107
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4468
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico Materials Science & Engineering. B concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3565381321391.pt_BR
dc.subjectComplex impedancept_BR
dc.subjectSemiconducting polymerspt_BR
dc.subjectInterfacept_BR
dc.subjectSurfacept_BR
dc.subjectDevicept_BR
dc.titleInfluence of NiCr/Au electrodes and multilayer thickness on the electrical properties of PANI/PVS ultrathin film grown by Lbl deposition.pt_BR
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