Structural, Magnetic, and Mossbauer Characterization of Size-Controlled Iron-Iron Oxide Nanoparticles Obtained by Chemical Methods

摘要

Size-controlled Fe nanoparticles have been obtained by thermal decomposition of Fe(CO){sub}5 in organic solution, in the presence of ligand molecules. Samples with different sizes, in the 6-12 nm range have been characterized by high-resolution transmission electron microscopy, X-ray diffraction, Mossbauer spectroscopy, and magnetization measurements. All samples present narrow size distributions and superparamagnetic behavior. The exposition to air leads to the formation of a polycrystalline phase, mainly Fe{sub}3O{sub}4.