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Enhanced microwave absorption properties of PMMA modified MnFe 2 O 4 -polyaniline nanocomposites

Lakshmi, RV and Bera, P and Chakradhar, RPS and Choudhury, B and Pawar, SP and Bose, S and Nair, RU and Barshilia, HC (2019) Enhanced microwave absorption properties of PMMA modified MnFe 2 O 4 -polyaniline nanocomposites. In: Physical Chemistry Chemical Physics, 21 (9). pp. 5068-5077.

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Official URL: https://doi.org/10.1039/c8cp06943c

Abstract

A manganese based spinel ferrite, chemically modified with polymethyl methacrylate (PMMA) and polyaniline (PANI) are synthesized and their composites are used as electromagnetic interference (EMI) shielding materials. X-ray diffraction studies show that the as-prepared manganese ferrite crystallizes in a cubic spinel structure. The particles are highly agglomerated and nanocrystalline as indicated by transmission electron microscopy. Manganese exists in +2 and +4 oxidation states and Fe in +2 and +3 oxidation states. Modified manganese ferrite and polyaniline composites in different weight ratios are evaluated for their EMI shielding properties. It is observed that composites containing the PMMA modified ferrite show enhanced total shielding effectiveness (SE T ) compared to those containing the unmodified ferrite in the X band frequency range (8-12 GHz). The optimized ratio of the PMMA modified ferrite and PANI demonstrates SE T values as high as �44 dB in the X band frequency range. © the Owner Societies.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Royal Society of Chemistry.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 08 Apr 2019 11:50
Last Modified: 08 Apr 2019 11:50
URI: http://eprints.iisc.ac.in/id/eprint/62027

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