‘Trigger-free’ self-healable electromagnetic shielding material assisted by co-doped graphene nanostructures

Menon, AV and Choudhury, B and Madras, G and Bose, S (2020) ‘Trigger-free’ self-healable electromagnetic shielding material assisted by co-doped graphene nanostructures. In: Chemical Engineering Journal, 382 .

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Abstract

The repercussions of the miniaturisation and augmentation of modern electronics and telecommunication are the unwanted interferences that come along with it. In the search for a good EMI shield, nanotechnology has come a long way from metal-based EM wave reflector to now lightweight polymeric EM wave absorbers. In this study, we have developed a unique heterostructure by combining the electronic properties of MWNTs, “flower-like” MoS2, magnetic properties of Fe3O4 and graphene oxide (GO) sheets. This resulted in a superior EM shielding performance of −43.6 dB at 18 GHz with up to 96% absorption of EM waves. Additionally, the effect of two other different type of dopants in rGO@MoS2 namely, dielectric dopant (SiO2) and conducting dopant (Ag) was also studied apart from magnetic dopant (Fe3O4) to establish their effect on final shielding efficiency. It was observed that magnetic dopant exhibited highest absorption performance (96%) followed by dielectric dopant (90%). Since these materials have potential usage in high-end applications, we have attempted to develop a multifunctional material whereby we have modified the polymer matrix to develop a “trigger-free” self-healing polymer with up to 70% recovery of its original mechanical properties and nearly unaltered EMI shielding performance post healing. Such a unique multi-dimensional approach helps to improve the quality and lifetime of high-performance shielding materials which takes care of the fact that polymeric materials are mechanically weak compared to their metal counterparts

Item Type:	Journal Article
Publication:	Chemical Engineering Journal
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	Electromagnetic pulse; Electronic properties; Graphene; Iron oxides; Layered semiconductors; Magnetite; Molybdenum compounds; Reduced Graphene Oxide; Self-healing materials; Shielding; Silica; Silver compounds; Sulfur compounds, Disulphide bonds; Electromagnetic interference shielding; Fe3O4; MoS2; Self-healing, Electromagnetic shielding
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	02 Feb 2023 07:02
Last Modified:	02 Feb 2023 07:02
URI:	https://eprints.iisc.ac.in/id/eprint/79729

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