Rare earth ion-infused α-MnO2 nano-rods for excellent EMI shielding efficiency: Experimental and theoretical insights

Mondal, D and Bhattacharya, D and Mondal, T and Kundu, M and Sarkar, S and Mandal, TK and Paul, BK and Das, S (2023) Rare earth ion-infused α-MnO2 nano-rods for excellent EMI shielding efficiency: Experimental and theoretical insights. In: Sustainable Materials and Technologies, 38 .

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Abstract

In this communication, for the first time rare earth elements like Gd3+ and Er3+ ions are impregnated into the α-MnO2tunneled structure involving the modified chemical synthesis route followed by hydrothermal technique. X-ray diffraction patterns and Raman spectroscopy confirm the proper phase formation without any impurity. A theoretical in-depth DFT study for the electronic bands and variation of density of states with the infusion of rare earth elements into the host structure confirms the experimental findings and depicts the suitability of the material for the EMI shielding application. The novel synthesis technique helps to achieve uniform nanorod formation with a high specific surface area. Doping-induced defects, high surface-to-volume ratio, Maxwell-Wagner�Siller interfacial polarization, etc. lead to achieving high dielectric response with moderate tangent loss at a frequency range of 40 Hz to 1 MHz. Temperature-dependent dielectric behavior indicates the paramagnetic to ferromagnetic transition at 120 °C and 70 °C for the Gd- and Er-doped α-MnO2 samples respectively. The electromagnetic interference (EMI) shielding effectiveness (SE) has achieved a maximum of �43 dB at 15.3 GHz and � 46 dB at 15.3 GHz for Gd- and Er-doped α-MnO2 thin layer of thickness �600 μm respectively. Higher dipolar polarization, loss tangent, conductive pathways, and defects inside the crystal lead to attaining a high EMI shielding efficiency. This result reveals >99.997 EMI SE against the hazardous electromagnetic waves in the microwave/GHz frequency region. © 2023

Item Type:	Journal Article
Publication:	Sustainable Materials and Technologies
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Circular waveguides; Crystal impurities; Efficiency; Electromagnetic pulse; Electromagnetic shielding; Hydrothermal synthesis; Manganese oxide; Metal ions; Nanorods; Polarization; Rare earth elements; Rare earths, Dielectric nanoparticles; Electromagnetic interference shielding; Electromagnetic wave shielding; High dielectric nanoparticle; High dielectrics; Ku band; Microwave absorbers; Rare earth element doped α-MnO2 nanoparticle; Shielding in X- and ku �band; Wave shielding, Nanoparticles
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	28 Feb 2024 11:48
Last Modified:	28 Feb 2024 11:48
URI:	https://eprints.iisc.ac.in/id/eprint/83639

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