Aladin Ullrich
University of Augsburg, Germany
Title: Infl uence of synthesis parameters on size, shape, composition and magnetic properties of transition metal oxide nanoparticles
Biography
Biography: Aladin Ullrich
Abstract
We have investigated the influence of synthesis parameters on the properties of transition metal oxide nanoparticles prepared by thermal decomposition of metalorganic precursors in high-boiling solvents (Tboil>300°C). The focus of the work was on the production of monodispersed iron and manganese oxide particles. By varying synthesis parameters, ferrite as well as core/shell particles, in the size range from <10 up to 20 nm with different composition and different shapes were produced. Size, shape and composition were investigated using energy fi ltered Transmission Electron Microscopy (TEM). Electron diffraction as well as X- ray diff raction was used for crystal structure analysis. Magnetic properties of the particles were investigated by SQUID magnetometer. An exchange bias was found for particles with an antiferromagnetic/ferromagnetic interface, while ferrite (MnxFe2-x)FeO4 particles showed a tunable saturation magnetization depending on the Fe/Mn ratio. Various applications, like in the fi eld of polymer processing, will be discussed.