Abstract
With an average diameter of 80–100 nm, nanostructures (nanorods or nanotubes) of polyaniline (PANI) composites containing Fe 3O 4 nanoparticles ( d≈10 nm) were prepared by a template-free method in the presence of β-naphthalene sulfonic acid (NSA) as a dopant. PANI–NSA/Fe 3O 4 nanostructures exhibited a superparamagnetic behavior (i.e. no hysteresis loop) and their conductivity was around 10 −2 S/cm. However, it was found that the electrical and magnetic properties of PANI–NSA/Fe 3O 4 nanostructures could be adjusted by changing the content of Fe 3O 4 nanoparticles in the composites. A template-like model was proposed to interpret the formation of the nanostructures.
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