Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 11: Focus: Advanced TEM spectroscopy - low energy excitations and chemical composition at high resolution (joint session KFM/HL)

HL 11.4: Talk

Monday, April 1, 2019, 16:10–16:30, PHY 5.0.20

Synthesis and high-resolution structural and chemical analysis of iron-manganese-oxide core-shell nanoparticles — •Aladin Ullrich, Mohammad Mostafizar Rahman, and Siegfried Horn — Universität Augsburg, Universitätsstr. 1, 86159 Augsburg

Nanoparticles were synthesized by thermal decomposition of a mixture of iron oleate and manganese oleate precursors in high-boiling solvents in the presence of Na-oleate and oleic acid as surfactants. The structural and chemical composition of the nanoparticles was investigated by high-resolution analytical transmission electron microscopy (TEM). The particles appear core-shell like in bright field TEM images. High-resolution TEM (HRTEM) analysis reveals a FeO/MnO like structure in the core and a spinel like structure in the shell. With high-resolution analytical methods like energy dispersive x-ray spectroscopy and electron energy loss spectroscopy, the distribution of the metals Mn and Fe, respectively, was investigated. Furthermore, differences in the oxidation state of these metals were found between the core and the shell region. The presence of sodium from the used surfactant (Na-oleate) on the surface of the particles has been proved.