Gandhi, Namita and Singh, Kuldeep and Ohlan, Anil and Singh, D. P. and Dhawan, S. K. (2011) Thermal, dielectric and microwave absorption properties of polyaniline–CoFe2O4 nanocomposites. Composites Science and Technology, 71 (15). pp. 1754-1760. ISSN 0266-3538

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Abstract

The present paper deals with the synthesis of conducting ferromagnetic polyaniline–CoFe2O4 (PC) nano-composites via one-step chemical oxidative polymerization of aniline in the presence of CoFe2O4 nanoparticles (30–40 nm). These nanocomposites of PC have been characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). Extended thermal analysis has revealed that the activation energy of these nanocomposites varies from 75.3 to 84.3 kJ/mol as com- pared to the activation energy of 50.3 kJ/mol for polyaniline-DBSA. In addition, dielectric and microwave absorption properties of the nanocomposites have been measured in the frequency range of 12.4–18 GHz (Ku-band) which demonstrate that more than 99% attenuation of microwaves (SEA = 21.5 dB) has been achieved using these nanocomposites. Systematic investigations reveal that the CoFe2O4 nanoparticles in the polyaniline matrix have phenomenal effect in determining the microwave absorption properties of the nanocomposites.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Nanocomposites; Thermal properties; Magnetic properties; Thermogravimetric analysis (TGA); Transmission electron microscopy (TEM)
Subjects:	Materials Science > Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	16 Oct 2012 09:11
Last Modified:	16 Oct 2012 09:11
URI:	http://npl.csircentral.net/id/eprint/693

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