Easy Synthesis and Magnetic Properties of Iron Oxide Nanoparticles

TLDR

Iron oxide nanoparticles (5‑, 11‑, and 19‑nm) were produced by thermal decomposition of Fe(CO)5 in the presence of residual oxygen followed by aeration, and characterized by TEM/HRTEM, XRD, Mössbauer spectroscopy, SQUID magnetometry, and optical microscopy. The intermediate particles formed via competing oxidation and crystal growth; aerated 5‑nm particles are superparamagnetic, 19‑nm particles are ferrimagnetic, and 11‑nm particles are superparamagnetic with some interparticle interactions.

Abstract

Easy preparation of iron oxide nanoparticles [5- and 11-nm maghemite (γ-Fe2O3) and 19-nm magnetite (Fe3O4)] by thermal decomposition of Fe(CO)5 in the presence of residual oxygen of the system and by consecutive aeration were investigated by TEM/HRTEM, XRD, and Mössbauer spectroscopy. Also, the magnetic properties of the nanoparticles were studied by SQUID magnetometer and optical microscopy. It was suggested that the intermediate iron oxide nanoparticles (before aeration) were formed by the competing processes of oxidation and crystal growth after decomposition of Fe(CO)5. At room temperature, the aerated 5-nm particles were superparamagnetic without interaction among the particles, whereas the 19-nm particles were ferrimagnetic. The 11-nm iron oxide nanoparticles were superparamagnetic with some interactions among the particles.