Monodispersed Superparamagnetic Fe3O4 Nanoparticles: Synthesis and Characterization
Abstract:Monodispersed Fe3O4 (magnetite) nanoparticles are synthesized by non-aqueous thermal decomposition route. The powder XRD reveals single phase spinel structure with 60 Å particle size. The TEM image shows nearly monodispersed spherical particles with log-normal median diameter of 49 Å and size distribution in ln(D) 0.12. The monodispersivity is also confirmed by SANS experiment. TGA pattern shows a sharp single step transition at 606 K indicating a monolayer coating of the oleic acid on particle surface. Temperature dependent low field dc magnetization study suggest that particles are superparamagnetic above 25 K with an effective blocking temperature 12 K @50 Oe field, indicating the dominance of particle–particle interaction in the system. The saturation magnetization of the nanocrystals, Ms, at 5 K is very close to that of bulk materials. This technique of synthesis gives high Ms of particles compared to other chemical routes.
Document Type: Research Article
Publication date: March 1, 2009
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