Preparation and characterization of polyaniline containing Fe3O4 nanoparticles using sodium dodecylbenzenesulfonate as a surfactant

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 Fe3O4 content of the reaction solution. The magnetic properties of the resulting composites showed superparamagnetic behavior, such as saturated magnetization (M-s = 1.8 emu g(-1)), remnant magnetization (M-r = 0), and coercive force (H-c = 0). The nanometer size (about 14 nm) Fe3O4 in the composites causes of the superparamagnetic behavior of the product.