Special Section on Nanostructured Thin Films: Fundamentals and Applications

Broadband dielectric/electric properties of epoxy thin films filled with multiwalled carbon nanotubes

[+] Author Affiliations
Jan Macutkevic

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

Polina P. Kuzhir

Research Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Street, 11 Minsk 220030, Belarus

Alesia G. Paddubskaya

Research Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Street, 11 Minsk 220030, Belarus

Juras Banys

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

Sergey A. Maksimenko

Research Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Street, 11 Minsk 220030, Belarus

Eleonora Stefanutti

Istituto Nazionale di Fisica Nucleare–Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati (Roma), Italy

Federico Micciulla

Istituto Nazionale di Fisica Nucleare–Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati (Roma), Italy

Stefano Bellucci

Istituto Nazionale di Fisica Nucleare–Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati (Roma), Italy

J. Nanophoton. 7(1), 073593 (Apr 02, 2013). doi:10.1117/1.JNP.7.073593
History: Received December 11, 2012; Revised March 12, 2013; Accepted March 14, 2013
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Abstract.  Many attempts have been made to fully explore flexibility, resistance to corrosion, and processing advantage of epoxy resin filled with carbon nanotubes (CNTs) as conductive filler, although sometimes with a certain degradation of polymers’ intrinsic properties. It is important to move the percolation threshold into the region of smaller CNTs’ concentration. The results of a broadband dielectric investigation of multiwalled CNT (MWCNT)/epoxy resin composites in wide temperature range from room temperature to 450 K were analyzed for percolation. Far below the percolation threshold (0.25 wt. % MWCNT) the dielectric properties of the composite are mostly determined by alpha relaxation in pure polymer matrix and the freezing temperature decreases due to the extra free volume at the polymer–filler interface. Close to the percolation threshold, the composite shows the negative temperature coefficient effect in the temperature region, where the pure polymer matrix becomes conductive. The activation energy of DC conductivity increases with the MWCNT concentration far below the percolation threshold and decreases close to it (1.5 wt. % MWCNT). The dielectric analysis of the MWCNT/epoxy resin reveals a significant influence of the polymer matrix on the temperature dependence of composite dielectric properties.

Figures in this Article
© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Jan Macutkevic ; Polina P. Kuzhir ; Alesia G. Paddubskaya ; Juras Banys ; Sergey A. Maksimenko, et al.
"Broadband dielectric/electric properties of epoxy thin films filled with multiwalled carbon nanotubes", J. Nanophoton. 7(1), 073593 (Apr 02, 2013). ; http://dx.doi.org/10.1117/1.JNP.7.073593


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