Enhanced microwave absorption properties of PMMA modified MnFe2O4-polyaniline nanocomposites

Lakshmi, RV and Bera, Parthasarathi and Chakradhar, RPS (2019) Enhanced microwave absorption properties of PMMA modified MnFe2O4-polyaniline nanocomposites. Physical Chemistry Chemical Physics, 21 (9). pp. 5068-5077. ISSN 14639076

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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 (SET) 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 SET values as high as 44 dB in the X band frequency range.

Item Type:	Article
Uncontrolled Keywords:	Nanocomposites
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials PHYSICS > Solid-State Physics
Depositing User:	Smt Bhagya Rekha KA
Date Deposited:	06 Jun 2022 15:47
Last Modified:	06 Jun 2022 15:47
URI:	http://nal-ir.nal.res.in/id/eprint/13602

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