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In situ synthesis and characterization of polyaniline-CaCu3Ti4O12 nanocrystal composites

Thomas, P and Dwarakanath, K and Varma, KBR (2009) In situ synthesis and characterization of polyaniline-CaCu3Ti4O12 nanocrystal composites. In: Synthetic Metals, 159 (19-20). pp. 2128-2134.

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Abstract

High dielectric constant (ca. 2.4 x 10(6) at 1 kHz) nanocomposite of polyaniline (PANI)/CaCu3Ti4O12 (CCTO) was synthesized using a simple procedure involving in situ polymerization of aniline in dil. HCl. The PANI and the composite were subjected to X-ray diffraction, Fourier transform infrared, thermo gravimetric, scanning electron microscopy and transmission electron microscopy analyses. The presence of the nanocrystallites of CCTO embedded in the nanofibers of PANI matrix was established by TEM. Frequency dependent characteristics of the dielectric constant. dielectric loss and AC conductivity were studied for the PANI and the composites. The dielectric constant increased as the CCTO content increased in PANI but decreased with increasing frequency (100 Hz-1 MHz) of measurement. The dielectric loss was two times less than the value obtained for pure PANI around 100 Hz. The AC conductivity increased slightly up to 2 kHz as the CCTO content increased in the PANI which was attributed to the polarization of the charge carriers.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science.
Keywords: Polyaniline; CaCu3Ti4O12 oxide; Nanocomposite; Electrical properties; Thermogravimetric; Electron microscopy
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 07 Dec 2009 07:20
Last Modified: 19 Sep 2010 05:52
URI: http://eprints.iisc.ernet.in/id/eprint/24940

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