Special Section on Nanocarbon Photonics and Optoelectronics

Dielectric properties and electrical conductivity of flat micronic graphite/polyurethane composites

[+] Author Affiliations
Artyom Plyushch, Jan Macutkevic, Juras Banys

Vilnius University, Faculty of Physics, Sauletekio av. 9, LT-10222 Vilnius, Lithuania

Polina P. Kuzhir

Research Institute for Nuclear Problems of Belarusian State University (INP BSU), NanoElectroMagnetics Lab, Bobruiskaya Street, 11 Minsk 220030, Belarus

Tomsk State University, Radiophysics faculty, Tomsk 634050, Russian Federation

Vanessa Fierro, Alain Celzard

IJL–UMR Université de Lorraine–CNRS, 7198, ENSTIB, 27 Rue Philippe Seguin, CS 60036, 88026 Epinal Cédex, France

J. Nanophoton. 10(1), 012511 (Nov 18, 2015). doi:10.1117/1.JNP.10.012511
History: Received September 9, 2015; Accepted October 6, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Artyom Plyushch ; Jan Macutkevic ; Polina P. Kuzhir ; Juras Banys ; Vanessa Fierro, et al.
"Dielectric properties and electrical conductivity of flat micronic graphite/polyurethane composites", J. Nanophoton. 10(1), 012511 (Nov 18, 2015). ; http://dx.doi.org/10.1117/1.JNP.10.012511


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