Tunable CoNi microstructures in flexible multilayered polymer films can shield electromagnetic radiation

Arief, Injamamul and Bhattacharjee, Yudhajit and Prakash, Om and Sahu, Megha and Suwas, Satyam and Bose, Suryasarathi (2019) Tunable CoNi microstructures in flexible multilayered polymer films can shield electromagnetic radiation. In: COMPOSITES PART B-ENGINEERING, 177 .

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Abstract

This paper highlights the outstanding electromagnetic shielding efficiency achieved by constructing layer-wise assembly of polymer films containing CoNi (cobalt-nickel) micro flowers, rods, and microspheres. Following a hydrothermal approach, various CoNi microstructures were synthesized from their metal salt precursors using wet chemistry followed by dispersing them in a PVDF matrix along with conducting multiwalled carbon nanotubes (MWNT) and subsequently hot-compressing them into thin flexible films (of thickness less than 1 mm). Few films were also prepared by dispersing only MWNTs in PVDF to construct a layer-wise assembly following an approach wherein a reflector spacer (PVDF/MWNT composites) is sandwiched between n (n = 0,1,2,3) absorbers (PVDF/CoNi/MWNT composites). The film thickness was adjusted in such a way that the total thickness of each assembly is ca. 0.9 mm. This strategy wherein a reflecting layer is sandwiched between the absorbing layers resulted in an excellent total shielding efficiency (SET) of -41 dB. By careful control of different layers in this layer-wise assembly, we managed to facilitate significant magnetic losses coupled with conducting losses. Therefore, this paper offers a replacement of conventional metallic shields with unique CoNi-based polymer composites for suppressing EM radiation.

Item Type:	Journal Article
Publication:	COMPOSITES PART B-ENGINEERING
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copyright of this article belongs to ELSEVIER SCI LTD
Keywords:	Multilayered films; CoNi microstructures; Multi-walled carbon nanotubes; Polymer nanocomposites; EMI shielding
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Dec 2019 07:24
Last Modified:	16 Dec 2019 07:24
URI:	http://eprints.iisc.ac.in/id/eprint/63920

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