Title

Electrical properties of intrinsically conductive core-shell polypyrrole/poly(vinylidene fluoride) electrospun fibers

RIS ID

99114

Publication Details

Dias, 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

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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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.synthmet.2014.09.013