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Article

Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes

1
Faculty of Physics, Vilnius University, 10222 Vilnius, Lithuania
2
Boreskov Institute of Catalysis, SB RAS, Lavrentieva 5, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Vlassios Likodimos and Bryan M. Wong
Materials 2022, 15(5), 1876; https://doi.org/10.3390/ma15051876
Received: 23 December 2021 / Revised: 22 February 2022 / Accepted: 26 February 2022 / Published: 2 March 2022
Polymer composites with electrically conductive inclusions are intensively developed for microwave shielding applications, where lightweight and elastic coatings are necessary. In this paper, dielectric properties of hybrid polyethylene composites containing cobalt nanoparticles and multi-wall carbon nanotubes (MWCNT) were investigated in the wide frequency range of 20–40 GHz for electromagnetic shielding applications. The percolation threshold in the hybrid system is close to 6.95 wt% MWCNT and 0.56 Co wt%. Cobalt nanoparticles (up to highest investigated concentration 4.8 wt%) had no impact on the percolation threshold, and for the fixed total concentration of fillers, the complex dielectric permittivity is higher for composites with bigger MWCNT concentrations. Moreover, the microwave complex dielectric permittivity of composites with high concentration of fillers is quite high (for composites with 13.4 wt% MWCNT and 1.1 wt% Co ε′ ≈ ε″ ≈ 20 at 30 GHz, it corresponds to microwave absorption 50% of 1 mm thickness plate); therefore, these composites are suitable for electromagnetic shielding applications. View Full-Text
Keywords: dielectric permittivity; cobalt nanoparticles; carbon nanotubes dielectric permittivity; cobalt nanoparticles; carbon nanotubes
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MDPI and ACS Style

Vanskevičė, I.; Kazakova, M.A.; Macutkevic, J.; Semikolenova, N.V.; Banys, J. Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes. Materials 2022, 15, 1876. https://doi.org/10.3390/ma15051876

AMA Style

Vanskevičė I, Kazakova MA, Macutkevic J, Semikolenova NV, Banys J. Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes. Materials. 2022; 15(5):1876. https://doi.org/10.3390/ma15051876

Chicago/Turabian Style

Vanskevičė, Ieva, Mariya A. Kazakova, Jan Macutkevic, Nina V. Semikolenova, and Juras Banys. 2022. "Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes" Materials 15, no. 5: 1876. https://doi.org/10.3390/ma15051876

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