Polyethylene Composites with Segregated Carbon Nanotubes Network: Low Frequency Plasmons and High Electromagnetic Interference Shielding Efficiency

Materials. 2020;13(5):1118 DOI 10.3390/ma13051118

 

Journal Homepage

Journal Title: Materials

ISSN: 1996-1944 (Print)

Publisher: MDPI AG

LCC Subject Category: Technology: Electrical engineering. Electronics. Nuclear engineering | Technology: Engineering (General). Civil engineering (General) | Science: Natural history (General): Microscopy | Science: Physics: Descriptive and experimental mechanics

Country of publisher: Switzerland

Language of fulltext: English

Full-text formats available: PDF, HTML

 

AUTHORS


Ludmila Vovchenko (Department of Physics, Taras Shevchenko National University of Kyiv, Volodymyrska str., 64/13, 01601 Kyiv, Ukraine)

Ludmila Matzui (Department of Physics, Taras Shevchenko National University of Kyiv, Volodymyrska str., 64/13, 01601 Kyiv, Ukraine)

Viktor Oliynyk (Department of Radiophysics, Electronics, and Computer Systems, Taras Shevchenko National University of Kyiv, Volodymyrska str., 64/13, 01601 Kyiv, Ukraine)

Yurii Milovanov (Institute of High Technologies, Taras Shevchenko National University of Kyiv, Volodymyrska str., 64/13, 01601 Kyiv, Ukraine)

Yevgen Mamunya (Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine48 Kharkivske Chaussee, 02160 Kyiv, Ukraine)

Nadezhda Volynets (Institute for Nuclear Problems of Belarusian State University, 11 Bobruiskaya Str., 220006 Minsk, Belarus)

Artyom Plyushch (Institute for Nuclear Problems of Belarusian State University, 11 Bobruiskaya Str., 220006 Minsk, Belarus)

Polina Kuzhir (Institute for Nuclear Problems of Belarusian State University, 11 Bobruiskaya Str., 220006 Minsk, Belarus)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 11 weeks

 

Abstract | Full Text

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<sup>&#8722;1</sup> S/m at 0.5&#8722;1% and 10 S/m at 6&#8722;12% of CNT. The investigation of the complex impedance in the frequency range 1 kHz&#8722;2 MHz shows that the sign of real part of the dielectric permittivity <inline-formula> <math display="inline"> <semantics> <mrow> <msubsup> <mi>&#949;</mi> <mi>r</mi> <mo>&#8242;</mo> </msubsup> </mrow> </semantics> </math> </inline-formula> 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&#8722;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&#8722;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.