Saini, Parveen and Barala, Sunil Kumar and Arora, Manju and Kotnala, R. K. (2013) Designing of Conducting Polymer Composites for Shielding of Microwave Radiations. Solid State Physics: Proceedings Of The 55th DAE Solid State Physics Symposium 2010, PTS A and B, 1536. 1237-1239. ISSN 0094-243X

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Abstract

Nanocomposites (NCs) possessing moderate conductivity and dielectric/magnetic properties were prepared by in-situ incorporation of different fillers [BaTiO3 (BT) and gamma-Fe2O3 (FO) nanoparticles (NPs)] within polyaniline (PANI) matrix. Several compositions were prepared by keeping PANI:filler ratio as 2: 1 and varying the FO: BT ratio of the NCs. The X-Ray diffraction patterns confirmed the formation of electrically conducting PANI and proper incorporation of BT or FO NPs. Similarly, HRTEM images and EDX elemental analysis confirm the formation of NCs and phase preservation of incorporated FO or BT NPS. The magnetization measurements revealed that incorporation of gamma-Fe2O3 resulted in improvement in magnetic properties with saturation magnetization value of 12.8 emu/g. The microwave shielding studies in the 12.4-18.0 GHz frequency range (P-band) revealed that the among various NCs, refelction loss was minimum (-4.6 dB) for composition having BT:FO ratio of 1:1 (i.e. PBF3) probably due to better matching of input impedance. Further, the incorporation of BT and FO NPs leads to reduction of skin depth and additional dielectric/magnetic losses resulting in absorption loss of -20.2 dB. The total attenuation (T) of -24.8 dB (i.e. >99 % attenuation) demonstrate the potential of these NCs for making futuristic microwave shields

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s American Institute of Physic
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 10:23
Last Modified:	19 Aug 2026 10:23
URI:	https://npl.csircentral.net/id/eprint/3295

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