Nanocrystalline cobalt oxide (Co3O4) was synthesized by sol–gel method using cobalt chloride as precursor. Conducting polyaniline-cobalt oxide (PANI/Co3O4) nanocomposites were synthesized by in situ polymerization of aniline (monomer) in the presence of as-synthesized nanocrystalline Co3O4. The synthesized nanocomposites were characterized by XRD, FTIR, UV-VIS and TEM analysis. TEM images show that PANI has been coated on nanocrystalline Co3O4, which confirms the formation of nanocomposites. XRD pattern show that nanocrystalline Co3O4 embedded into polycrystalline PANI to form crystalline nanocomposites. Fourier transform infrared and ultraviolet visible spectroscopy show that cobalt oxide nanoparticles get electrostatically bound to the specific sites of polyaniline. PANI/Co3O4 nanocomposites show semiconducting behavior as that of conducting polyaniline. In this article, the influence of filler concentration on the transport parameters and magnetic properties of polyaniline nanocomposites has been investigated.
Nanocrystalline nickel ferrite (NiFe 2 O 4 ) powder of crystallite size 20 nm was synthesized by refluxing method. Electrically conductive polyaniline-nickel ferrite (PANI/NiFe 2 O 4 ) nanocomposites have been synthesized by an in-situ polymerization of aniline monomer in the presence of as-prepared NiFe 2 O 4 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 NiFe 2 O 4 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 NiFe 2 O 4 . Nanocomposites showed increase in saturation magnetization as compared to that of PANI and increase in electrical conductivity as compared to that of NiFe 2 O 4 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 behavior. 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.
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