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TitleElectrical properties of intrinsically conductive core-shell polypyrrole/poly(vinylidene fluoride) electrospun fibers
Author(s)Dias, J. C.
Correia, D. M.
Botelho, Gabriela
Lanceros-Méndez, S.
Sencadas, Vítor João Gomes Silva
KeywordsPoly(vinylidene fluoride)-PVDF
Electrical conductivity
Mechanical properties
Issue dateNov-2014
JournalSynthetic Metals
CitationDias, J. C., Correia, D. M., Botelho, G., Lanceros-Méndez, S., & Sencadas, V. (2014). Electrical properties of intrinsically conductive core–shell polypyrrole/poly (vinylidene fluoride) electrospun fibers. Synthetic Metals, 197, 198-203.
Abstract(s)Polypyrrole (PPy) has been synthesized as an homogeneous layer on the fibers of electroactive poly(vinylidene fluoride) (PVDF) electrospun mats via in-situ polymerization of pyrrole (Py). A core-sheath structure was obtained, the electrical conductivity depending on synthesis time, which influences the morphology and thickness of PPy layer. An overall dc conductivity of 70 ± 4 S m−1 was obtained for the sample with a PPy layer of 160 ± 25 nm. Further, the thermal coefficient of resistivity obtained for the sample after 120 min in-situ polymerization is almost twice the one calculated for the sample with 5 min synthesis time. The temperature dependence of the electrical dc conductivity of the PPy/PVDF membranes gives evidence of a transport mechanism based on Mott's variable range hopping model. Using this model, values for the density of states, hopping energy and distance were assessed.
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Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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