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Electromagnetic interference shielding effectiveness of polyaniline-nickel oxide coated cenosphere composite film

Bora, Pritom J and Vinoy, KJ and Ramamurthy, Praveen C and Kishore, Kishore and Madras, Giridhar (2017) Electromagnetic interference shielding effectiveness of polyaniline-nickel oxide coated cenosphere composite film. In: Composites Communications, 4 . pp. 37-42. ISSN 24522139

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Official URL: https://doi.org/10.1016/j.coco.2017.04.002


The solid waste material cenosphere (fly ash, by-product of thermal power plants) was nickel oxide nanoparticle coated (NiOC, core shell structure) by chemical heterogeneous precipitation and thermal reduction method. in situ synthesis of polyaniline (PANI) and NiOC composite (PNiOC) was carried out at -30±2 °C under nitrogen and characterized. The free standing films of as synthesized PNiOC composite were prepared by solution casting (followed by acid vapor treatment) and electromagnetic interference (EMI) shielding effectiveness (SE) was investigated in the J-band (5.8–8.2 GHz), X-band (8.2–12.4 GHz) and Ku-band (12.4–18 GHz). An average EMI SE of ~24 dB, ~27–24 dB, ~21 dB was observed for 81±3 μm thicker flexible free standing PNiOC film in the J, X and Ku-band respectively. Effective EMI shielding due to absorption (SEA) was found to be dominant for PNiOC film. Unlike PANI emeraldine salt (ES) film, the EMI shielding due to absorption (SEA) was found more than two times higher for PNiOC film. Due to the presence of NiOC hollow microspheres in PANI, the time average power of incident electromagnetic wave decreases resulting in an increase of EMI SE (SEA). This film can be considered as a novel coating material for various applications such as unmanned vehicles, robotic and microwave engineering to protect against EMI.

Item Type: Journal Article
Publication: Composites Communications
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Elsevier Ltd.
Keywords: microstructures; polymer-matrix composites (PMCs); thin films
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 30 May 2022 04:44
Last Modified: 30 May 2022 04:44
URI: https://eprints.iisc.ac.in/id/eprint/72825

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