Nanocrystalline Nickel Ferrite Reinforced Conducting Polyaniline Nanocomposites

Subhash B. Kondawar1*, Arti I. Nandapure2, Bharti I. Nandapure1

1Department of Physics, R.T.M. Nagpur University, Nagpur 440033, India

2B. D. College of Engineering, Sevagram, Wardha 442001, India

Adv. Mater. Lett., 2014, 5 (6), pp 339-344

DOI: 10.5185/amlett.2014.amwc.1035

Publication Date (Web): Mar 23, 2014

E-mail: sbkondawar@yahoo.co.in

Abstract


Nanocrystalline nickel ferrite (NiFe2O4) powder of crystallite size ~20 nm was synthesized by refluxing method. Electrically conductive polyaniline-nickel ferrite (PANI/NiFe2O4) nanocomposites have been synthesized by an in-situ polymerization of aniline monomer in the presence of as-prepared NiFe2O4 in different weight percentage (5%, 10%, and 15%). These nanocomposites were subsequently characterized for morphological, crystalline, structural, electrical and magnetic properties by Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Four Probe Resistivity (FPR) and Vibrating Sample Magnetometer (VSM). Existence of NiFe2O4 in the nanocomposites was confirmed by XRD, FTIR and TEM analysis. The change in morphology with crystallite size ? 50 nm was observed for the nanocomposites clearly indicate the coating of PANI on  NiFe2O4 . Nanocomposites showed increase in saturation magnetization as compared to that of PANI and increase in electrical conductivity as compared to that of  NiFe2O4  indicating the synergistic effect of individual components. The saturation magnetization drastically increased as nickel ferrite content changed from 5 to 15% in nanocomposites. The conductivity of nanocomposites increased with temperature, exhibiting typical semiconductor behavior. The nanocomposites show semiconducting and ferromagnetic behaviour. The electrical conductivity of nanocomposites decreased from 1.089 to 0.268 S/cm, but saturation magnetization increased from 0.97 to 2.803 emu/g, when ferrite content changed from 5 to 15 wt%, indicates such nanocomposites are good for electromagnetic devices.

Keywords

Conducting polymer, polyaniline, nickel ferrite, nanocomposites, VSM.

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