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Open AccessArticle

One-Dimensional Nanostructures of Polypyrrole for Shielding of Electromagnetic Interference in the Microwave Region

1
Centre of Polymer Systems, Tomas Bata University in Zlín, 760 01 Zlín, Czech Republic
2
Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
3
Faculty of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic
4
Faculty of Mathematics and Physics, Charles University, 180 00 Prague 8, Czech Republic
5
Central Laboratory, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(22), 8814; https://doi.org/10.3390/ijms21228814
Received: 27 October 2020 / Revised: 18 November 2020 / Accepted: 19 November 2020 / Published: 21 November 2020
(This article belongs to the Special Issue Stabilization and Degradation of Polymers)
Polypyrrole one-dimensional nanostructures (nanotubes, nanobelts and nanofibers) were prepared using three various dyes (Methyl Orange, Methylene Blue and Eriochrome Black T). Their high electrical conductivity (from 17.1 to 60.9 S cm−1), good thermal stability (in the range from 25 to 150 °C) and resistivity against ageing (half-time of electrical conductivity around 80 days and better) were used in preparation of lightweight and flexible composites with silicone for electromagnetic interference shielding in the C-band region (5.85–8.2 GHz). The nanostructures’ morphology and chemical structure were characterized by scanning electron microscopy, Brunauer–Emmett–Teller specific surface measurement and attenuated total reflection Fourier-transform infrared spectroscopy. DC electrical conductivity was measured using the Van der Pauw method. Complex permittivity and AC electrical conductivity of respective silicone composites were calculated from the measured scattering parameters. The relationships between structure, electrical properties and shielding efficiency were studied. It was found that 2 mm-thick silicone composites of polypyrrole nanotubes and nanobelts shield almost 80% of incident radiation in the C-band at very low loading of conductive filler in the silicone (5% w/w). Resulting lightweight and flexible polypyrrole composites exhibit promising properties for shielding of electromagnetic interference in sensitive biological and electronic systems. View Full-Text
Keywords: conducting polymers; electromagnetic shielding; 1D nanostructures; thermal stability; microwave region conducting polymers; electromagnetic shielding; 1D nanostructures; thermal stability; microwave region
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MDPI and ACS Style

Moučka, R.; Sedlačík, M.; Kasparyan, H.; Prokeš, J.; Trchová, M.; Hassouna, F.; Kopecký, D. One-Dimensional Nanostructures of Polypyrrole for Shielding of Electromagnetic Interference in the Microwave Region. Int. J. Mol. Sci. 2020, 21, 8814.

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