Title Polyethylene composites with segregated carbon nanotubes network: low frequency plasmons and high electromagnetic interference shielding efficiency
Authors Vovchenko, Ludmila ; Matzui, Ludmila ; Oliynyk, Viktor ; Milovanov, Yurii ; Mamunya, Yevgen ; Volynets, Nadezhda ; Plyushch, Artyom ; Kuzhir, Polina
DOI 10.3390/ma13051118
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Is Part of Materials.. Basel : MDPI. 2020, vol. 13, iss. 5, art. no. 1118, p. 1-14.. eISSN 1996-1944
Keywords [eng] carbon nanotube ; polyethylene ; segregated composite ; complex impedance ; electromagnetic shielding
Abstract [eng] Polyethylene (PE) based composites with segregated carbon nanotubes (CNTs) network was successfully prepared by hot compressing of a mechanical mixture of PE and CNT powders. Through comparison with a composite comprising randomly distributed carbon nanotubes of the same concentration, we prove that namely the segregated CNT network is responsible for the excellent electrical properties, i.e., 10(-1) S/m at 0.5-1% and 10 S/m at 6-12% of CNT. The investigation of the complex impedance in the frequency range 1 kHz-2 MHz shows that the sign of real part of the dielectric permittivity <mml:semantics>epsilon r '</mml:semantics> changes from positive to negative in electrically percolated composites indicating metal-like behavior of CNT segregated network. The obtained negative permittivity and AC conductivity behavior versus frequency for high CNT content (3-12%) are described by the Drude model. At the same time, in contrast to reflective metals, high electromagnetic shielding efficiency of fabricated PE composites in the frequency range 40-60 GHz, i.e., close to 100% at 1 mm thick sample, was due to absorption coursed by multiple reflection on every PE-CNT segregated network interface followed by electromagnetic radiation absorbed in each isolated PE granule surrounded by conductive CNT shells.
Published Basel : MDPI
Type Journal article
Language English
Publication date 2020
CC license CC license description