Geometry and mesh size control the EMI shielding in 3D printed conducting shape memory PU structures

Menon, AV and Jagadeshvaran, PL and Bose, S (2023) Geometry and mesh size control the EMI shielding in 3D printed conducting shape memory PU structures. In: Journal of Materials Chemistry C .

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Abstract

Innovations in the telecommunication industry and its growth in the direction of wireless technologies have effectuated electromagnetic interference (EMI) as their ramification. The progressive miniaturization of gadgets has made circuitry complex bringing several circuit elements in the vicinity of each other, allowing them to interfere with each other. EMI shields are used to prevent such cross-talk and interferences. To design intricate parts in systems, 3D printing is gaining much popularity. With increased emphasis on both reliability and multi-functionality especially in the defence industry, the so-called ‘smart’ structures and ‘intelligent’ materials that can reduce the complexity of the system are also gaining importance. Keeping these requirements in mind, herein, we have developed EMI shields using silver coated 3D printed shape memory polyurethane-based structures using a simple mussel-inspired electroless plating method. To gain further insights, the effect of geometry (hexagonal, square and pyramid) and mesh size/pyramid height (varying between 1 mm to 5 mm) on shielding effectiveness was also studied in this work. The prepared samples showed excellent shielding properties with values reaching as high as −46 dB. The SE values were found to decrease with increasing mesh size for hexagonal and square shaped meshes, and the converse was observed for pyramidal structures. Moreover, the shape memory properties of polyurethanes were retained to a large extent after dopamine coating and electroless deposition - opening avenues of applications not only as EMI shields but also in the field of shape memory triggered actuators and sensors.

Item Type:	Journal Article
Publication:	Journal of Materials Chemistry C
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry.
Keywords:	3D printing; Amines; Electroless plating; Electromagnetic shielding; Mesh generation; Polyurethanes; Telecommunication industry, Circuit elements; Electromagnetic interference shielding; Geometry size; Mesh size; Mesh size control; Miniaturisation; Printed conducting; Shape-memory; Telecommunications industry; Wireless technologies, Electromagnetic pulse
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	13 Apr 2023 10:31
Last Modified:	13 Apr 2023 10:31
URI:	https://eprints.iisc.ac.in/id/eprint/81328

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