Synthesis and magnetic properties of monodisperse Fe3O4 nanoparticles with controlled sizes

Abstract Monodisperse magnetite nanoparticles coated with organic ligands have been chemically synthesised by using the poliol method. Modifying the synthetic conditions, particle diameter can be tuned from 3.5 to 7.1 nm. In order to investigate the critical size effects on the magnetic behavior of the samples, Fe3O4 nanoparticles have been fully characterized by X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, SQUID magnetometry and electron paramagnetic resonance spectroscopy.