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Ultrathin structures derived from interfacially modified polymeric nanocomposites to curb electromagnetic pollution

Sushmita, K and Formanek, P and Fischer, D and Potschke, P and Madras, G and Bose, S (2021) Ultrathin structures derived from interfacially modified polymeric nanocomposites to curb electromagnetic pollution. In: Nanoscale Advances, 3 (9). pp. 2632-2648.

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Official URL: https://doi.org/10.1039/d0na01071e


The use of electronic devices and wireless networks is increasing rapidly, and electromagnetic (EM) pollution remediation remains a challenge. We employed a unique approach to fabricate two ultrathin (approx. 53 μm) multilayered assemblies to address this. By sequentially stacking thin films of polyvinylidene difluoride (PVDF) and polycarbonate (PC) nanocomposites and interfacially locking them with a mutually miscible polymer (PMMA, polymethyl methacrylate), materials with enhanced structural properties and electromagnetic interference (EMI) shielding performance can be designed. Utilizing reduced graphene oxide (rGO) and molybdenum disulfide (MoS2) as a template, ferrite was grown on the surface to design two different nanohybrid structures (rGO-Fe3O4 and MoS2-Fe3O4). PVDF was composited with either rGO-Fe3O4 or MoS2-Fe3O4, and multiwall carbon nanotubes (CNTs) were dispersed in the PC component. As PC and PVDF are immiscible, their poor interface would result in inferior structural properties, which can be challenging in designing EMI shielding materials due to cyclic thermal fatigue. Hence, PMMA is sandwiched to interfacially stitch the components (PC and PVDF) and improve interfacial adhesion. This was confirmed using SEM/EDS and Raman mapping/imaging. The mechanical stability of the multilayered assemblies was characterized using a dynamic mechanical analyzer (DMA), and the storage modulus was found to be as high as 2767 MPa at 40 °C (@constant frequency and strain amplitude), for the multilayered film with rGO-Fe3O4 in PVDF, PMMA as a sandwich layer and CNTs in PC. A typical assembly of 9 multilayers (�480 μm) with rGO-Fe3O4 in PVDF, and CNTs in PC, and interfacially stitched with PMMA gave rise to a high EMI shield effectiveness (SET) of -26.3 dB @ 26.5 GHz. This unique arrangement of a multilayered assembly suppressed EMI primarily by absorption. © 2021 The Royal Society of Chemistry.

Item Type: Journal Article
Publication: Nanoscale Advances
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to Authors
Keywords: Electromagnetic pulse; Film preparation; Graphene; Iron oxides; Layered semiconductors; Magnetite; Mechanical stability; Molybdenum compounds; Multiwalled carbon nanotubes (MWCN); Nanocomposite films; Pollution; Polymer films; Polymethyl methacrylates; Reduced Graphene Oxide; Shielding; Structural properties; Sulfur compounds; Thermal fatigue, Dynamic mechanical analyzer; Electro magnetic pollution; Interfacial adhesions; Multilayered assemblies; Polymeric nanocomposites; Polyvinylidene difluoride; Reduced graphene oxides (RGO); Ultra-thin structures, Electromagnetic shielding
Department/Centre: Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 04 Aug 2021 09:16
Last Modified: 04 Aug 2021 09:16
URI: http://eprints.iisc.ac.in/id/eprint/68921

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