Shielding Effectiveness Study of Barium-Hexaferrite Incorporated, β-phase Improved Poly(vinylidene fluoride) Composite Film: A Metamaterial Useful for the Reduction of Electromagnetic Pollution.

Author(s) Sutradhar, S.; Saha, S.; Javed, S.
Journal ACS Appl Mater Interfaces
Date Published 2019 Jun 12
Abstract

In the present work reports the high electromagnetic interference (EMI) shielding effectiveness of ~ -93.5 dB at 8.63 GHz, -97.6 dB at 8.61 GHz in the X- and Ku-bands, for 10 and 20 weight% of barium hexaferrite (BaH) nanoparticles loaded poly(vinylidene fluoride) (PVDF) based composite films with a thickness of ~ 0.210 and 0.260 mm have been reported. BaH-PVDF composite films with layer structure have been considered in the present report in order to establish an excellent EMI shielding material for the suppration of electromagnetic pollution with good control on flexibility, surface area, and thickness. Structural and morphological measurements reveal that the polar β-phase crystallization of the BaH-PVDF composite films has been enhanced in comparison to the pure PVDF film and these measurements also reveal the influence of BaH nanoparticles on structural alteration from non-polar α-phase to the polar/electroactive β-phase of PVDF matrix. The resultant BaH-PVDF composite films produce multiple interfaces between magnetic BaH nanoparticles and β-phase enriched electroactive PVDF which plays the most significant role for the enhancement of the EMI shielding effectiveness (SE) in the microwave/GHz frequency range. This high value of EMI shielding effectiveness (SE) with > 99.999999999% attenuation has not been found so far in the PVDF based composite materials by anyone else. This particular feature of BaH-PVDF composite materials suggests that BaH-PVDF composite films can be considered as the most useful one for the fabrication of lightweight, flexible, and thickness controlled EMI shielding materials for the Reduction of pollution created by the electromagnetic waves in the microwave/GHz frequency region.

DOI 10.1021/acsami.9b05122
ISSN 1944-8252
Citation Sutradhar S, Saha S, Javed S. Shielding Effectiveness Study of Barium-Hexaferrite Incorporated, β-phase Improved Poly(vinylidene fluoride) Composite Film: A Metamaterial Useful for the Reduction of Electromagnetic Pollution. ACS Appl Mater Interfaces. 2019.

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