Synthesis of Fe₃O₄ /polyaniline nanocomposite in reversed micelle systems and its performance characteristics

The magnetic Fe₃O₄ nanoparticles with average diameter of about 10nm were prepared by the hydrothermal method. The Fe ₃O₄/polyaniline nanocomposites were synthesized via reversed micelle method by using Fe₃O₄, camphorsulfonic acid (CSA) and ammonium peroxydisulfate (APS) as raw material, dopant and surfactant, and oxidant, respectively. The sample was characterized by XRD, UV-Vis and FT-IR. The spectra show that PANI was synthesized by chemical oxidation polymerization, while combined with Fe₃O₄ to generate nanocomposite in reversed micelle systems. The SEM results indicate that Fe₃O₄ nanoparticles are possibly coated by a thin layer of PANI. The electrical properties and magnetic properties of sample were studied by conductivity measurement, DC and AC magnetism measurement. Compared with the synthesized Fe₃O₄, the conductivity of nanocomposites increases 45%. The specific magnetization of nanocomposites is lower than the Fe₃O₄ nanoparticles. At the same magnetic field, μ′ of nanocomposites decreases with increasing the frequency of alternating magnetic.