Magnetic and conducting polyaniline (PAn)/Fe3O4 nanoparticles were prepared in the aqueous solution by using sodium dodecylbenzenesulfonate (DBSNa) as a surfactant. The chemical structure and surface morphology of PAn/Fe3O4 nanoparticles were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscope. The conductivity of the composites was measured as a function of the Fe 3O4 content of the reaction solution. The magnetic properties of the resulting composites showed superparamagnetic behavior, such as saturated magnetization (Ms = 1.8 emu g- 1), remnant magnetization (Mr = 0), and coercive force (Hc = 0). The nanometer size (about 14 nm) Fe3O4 in the composites causes of the superparamagnetic behavior of the product.
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