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Nanocomposites based on transition metal oxides in polyvinyl alcohol for EMI shielding application

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Abstract

In the present work, the nanocomposites based on different transition metal oxides like iron oxide (Fe2O3), zinc oxide (ZnO), silicon dioxide (SiO2), zirconium dioxide (ZrO2), and titanium dioxide (TiO2) in PVA matrix have been studied for their suitability as electromagnetic interference (EMI) shielding materials in the frequency range of 4–8 GHz (C-band) and 8–12 GHz (X-band). The nanocomposites containing 0.1, 0.5, 1.0, 5.0, and 10.0 wt% of oxides in the matrix were synthesised by solvent casting method. The EMI attenuation studies in 4–12 GHz frequency range were carried out using the Vector Network Analyzer R & S: ZVA40 method by measuring the loss due to reflection. The minimum reflectivity values for the composites containing Fe2O3, ZnO, SiO2, ZrO2, and TiO2 in PVA matrix at 10 wt% concentration level in the matrix were found to be −38.85 dB (10.4 GHz), −33.65 dB (10.4 GHz), −41.90 dB (10.4 GHz), −24.90 dB (11.0 GHz), and −32.90 dB (9.76 GHz), respectively. Based on these results, the SiO2- and Fe2O3-based composites, which also exhibit high thermal stability and mechanical strength, are found to be low-cost and efficient EMI shielding materials.

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Acknowledgments

The authors sincerely thank Dr. Rajkumar, Sc ‘E’, Department of Electronics, DIAT for extending the test facilities for measurement of EMI shielding properties of various nanocomposites and for valuable discussion on the test results. Authors are also grateful to Prof. P. K. Khanna, Head, Department of Applied Chemistry and Dr. A. B. Samui, Visiting Professor, DIAT for valuable discussions and constructive suggestions. Our sincere thanks are also due to Vice Chancellor, Defence Institute of Advance Technology, for moral support, constant encouragement, and permission to publish this work.

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    Ranjana Singh & Suresh G. Kulkarni

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  1. Ranjana Singh
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Singh, R., Kulkarni, S.G. Nanocomposites based on transition metal oxides in polyvinyl alcohol for EMI shielding application. Polym. Bull. 71, 497–513 (2014). https://doi.org/10.1007/s00289-013-1073-2

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