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Multi-layered composites using polyurethane-based foams and 3D-printed structures to curb electromagnetic pollution

Sushmita, K and Maiti, S and Bose, S (2022) Multi-layered composites using polyurethane-based foams and 3D-printed structures to curb electromagnetic pollution. In: Materials Advances, 3 (11). pp. 4578-4599.

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Official URL: https://doi.org/10.1039/d1ma01089a


Herein, a comparative study of the electromagnetic interference (EMI) shielding performance of multi-layered architectures fabricated using different strategies (i.e., polyurethane (PU)-based film, foam, and 3D printed structures) has been evaluated. The key attributes, i.e., conductivity and various losses towards efficient attenuation of the incoming EM radiation, were achieved by incorporating multiwalled carbon nanotubes (CNTs) and ferrite-decorated reduced graphene oxide (rGO-Fe3O4) strategically in the multi-layered structure. To fabricate the multi-layered architecture, rGO-Fe3O4 was incorporated in polyvinylidene difluoride (PVDF) and the CNTs in the polycarbonate (PC) as the two outer layers of the architecture. PU-based structures (film or foam or 3D printed mesh) containing CNTs were fabricated and sandwiched between the PC and PVDF composite films to develop multi-layered architecture with improved shielding performance. The novelty of this work lies in the fabrication and shielding study of such porous-layered composite structures and comparing them with non-porous counterparts. The results suggested that amongst all the fabricated structures, the PU-CNT foam-based multi-layered structure showed a high shielding effectiveness (SET) value of −39 dB in the K-band, with absorption-dominated shielding (91% and above). In order to further enhance the shielding effectiveness, Ag was sputtered on the PU-foam, which resulted in the highest SET value of −50 dB in the X-band. The results presented here begin to suggest that in-situ synthesized foam with non-uniform and dead pores enhances the shielding performance compared to 3D printed mesh structures or non-porous structures.

Item Type: Journal Article
Publication: Materials Advances
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 17 Sep 2022 02:55
Last Modified: 17 Sep 2022 02:55
URI: https://eprints.iisc.ac.in/id/eprint/76552

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