Preparation and Dielectric Properties of Polyaniline-Coated Magnetite Nanocomposites

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The conductive polymers such as polyaniline (PANI) exhibit considerable electrical conductive properties. The coating of PANI with magnetic (Fe3O4) nanoparticles formed composites (PANI/Fe3O4) with required dielectric properties. The morphology result study of PANI/Fe3O4 by field emission scanning electron microscope (FESEM) indicate the presence of PANI with tubes like structure containing different wt % of Fe3O4 nanoparticles (5, 15, 25 wt %). The structural pattern investigated by XRD revealed the presence of Fe3O4 nanoparticles at 2θ = 35.58º, while the amorphous structure indicates the presence of PANI matrix. However, the chemical bonding analysis using FTIR shows chemical conjugation of bonds at 3336, 3300 and 3277 cm-1 due to presence of NH group in PANI and OH group in Fe3O4 nanoparticles, while presence of 504 and 526 cm-1 suggesting that Fe3O4 nanoparticles are present in the composites materials. The dielectric properties study by 4-point probe and VSM shows that PANI and PANI/Fe3O4 nanocomposites exhibit good electrical properties (1.55 to 1.35 S/cm) which are decreasing with increase of Fe3O4 nanoparticles, may be resulting due to insulating behaviour of the magnetic nanoparticles, while the magnetic properties of PANI/Fe3O4 nanocomposites indicate super paramagnetic properties with saturation magnetization of (59.4, 5.96, 11.94 and 15.43 emus/g).