Dielectric properties of graphite-based epoxy composites

Antonino Cataldo, Federico Micciulla, Dzmitry Bychanok, Alesia Paddubskaya, Remigijus Juskenas, Antonino Cataldo, Ieva Kranauskaite, Silvia Bistarelli, Vanessa Fierro, Sergey Maksimenko, Polina Kuzhir, Jan Macutkevic, Nadeja Volynets, Alain Celzard, Juras Banys, Sergey Maksimenko, Stefano Bellucci

Risultato della ricerca: Article

25 Citazioni (Scopus)

Abstract

Composite materials based on epoxy resin filled with various kinds of graphite particles: exfoliated graphite, natural graphite, and coarse, medium and fine artificial graphites have been prepared. Results of broadband dielectric investigations of such materials in wide temperature (25–450 K) and frequency (20 Hz–3 THz) ranges are presented. The dielectric permittivity strongly increases with graphite particle size. The graphite particle size and shape also have a strong impact on freezing temperature, conductivity activation energy and composite electromagnetic absorption properties at room temperature. The lowest percolation threshold is observed for exfoliated graphite (EG)-based composites. At low temperatures (below glass transition temperature of pure polymer matrix), the electrical conductivity in composites above the percolation threshold is mainly governed by electron tunnelling between graphite particles. At higher temperatures, electrical conductivity due to finite electrical conductivity of polymer matrix and by electron tunnelling from polymer matrix to graphite particles occurs in all composites. Microwave experiments show that EG is the only really effective additive, out of all investigated graphite particles, for producing electromagnetic interference shielding composite materials: 2 wt% of EG in epoxy is indeed not transparent for the electromagnetic radiation at 30 GHz.
Lingua originaleEnglish
pagine (da-a)1623-1633
Numero di pagine11
RivistaPHYSICA STATUS SOLIDI. A, APPLICATIONS AND MATERIALS SCIENCE
Volume211
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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    Cataldo, A., Micciulla, F., Bychanok, D., Paddubskaya, A., Juskenas, R., Cataldo, A., Kranauskaite, I., Bistarelli, S., Fierro, V., Maksimenko, S., Kuzhir, P., Macutkevic, J., Volynets, N., Celzard, A., Banys, J., Maksimenko, S., & Bellucci, S. (2014). Dielectric properties of graphite-based epoxy composites. PHYSICA STATUS SOLIDI. A, APPLICATIONS AND MATERIALS SCIENCE, 211, 1623-1633.