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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MetadadosDescriçãoIdioma
Autor(es): dc.creatorSantos, Mirela de Castro-
Autor(es): dc.creatorMunford, Maximiliano Luis-
Autor(es): dc.creatorBianchi, Rodrigo Fernando-
Data de aceite: dc.date.accessioned2025-08-21T15:26:27Z-
Data de disponibilização: dc.date.available2025-08-21T15:26:27Z-
Data de envio: dc.date.issued2015-02-24-
Data de envio: dc.date.issued2015-02-24-
Data de envio: dc.date.issued2012-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/4468-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.mseb.2011.12.039-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1014790-
Descrição: dc.descriptionIn 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsO periódico Materials Science & Engineering. B concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3565381321391.-
Palavras-chave: dc.subjectComplex impedance-
Palavras-chave: dc.subjectSemiconducting polymers-
Palavras-chave: dc.subjectInterface-
Palavras-chave: dc.subjectSurface-
Palavras-chave: dc.subjectDevice-
Título: dc.titleInfluence of NiCr/Au electrodes and multilayer thickness on the electrical properties of PANI/PVS ultrathin film grown by Lbl deposition.-
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