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Journal of Nanophotonics

Dielectric properties and electrical conductivity of flat micronic graphite/polyurethane composites
Author(s): Artyom Plyushch; Jan Macutkevic; Polina P. Kuzhir; Juras Banys; Vanessa Fierro; Alain Celzard
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Paper Abstract

Results of broadband dielectric spectroscopy of flat micronic graphite (FMG)/polyurethane (PU) resin composites are presented in a wide temperature range (25–450 K). The electrical percolation threshold was found to lie between 1 and 2 vol. % of FMG. Above the percolation threshold, the composites demonstrated a huge hysteresis of properties on heating and cooling from room temperature up to 450 K, along with extremely high values of dielectric permittivity and electrical conductivity. Annealing proved to be a very simple but powerful tool for significantly improving the electrical properties of FMG-based composites. In order to explain this effect, the distributions of relaxation times were calculated by the complex impedance formalism. Below room temperature, both dielectric permittivity and electrical conductivity exhibited a very low temperature dependence, mainly caused by the different thermal properties of FMG and pure PU matrix.

Paper Details

Date Published: 18 November 2015
PDF: 12 pages
J. Nanophoton. 10(1) 012511 doi: 10.1117/1.JNP.10.012511
Published in: Journal of Nanophotonics Volume 10, Issue 1
Show Author Affiliations
Artyom Plyushch, Vilnius Univ. (Lithuania)
Jan Macutkevic, Vilnius Univ. (Lithuania)
Polina P. Kuzhir, Belarusian State Univ. (Belarus)
Tomsk State Univ. (Russian Federation)
Juras Banys, Vilnius Univ. (Lithuania)
Vanessa Fierro, Univ. de Lorraine (France)
Alain Celzard, Univ. de Lorraine. (France)


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