SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Oxide and Insulator Surfaces I: Adsorption and Reaction of Small Molecules
O 81.3: Vortrag
Donnerstag, 30. März 2023, 15:30–15:45, CHE 91
Growth and adsorption studies of magnetite nanoparticles on Al2O3 — •Mohammad Ebrahim Haji Naghi Tehrani1,2, Marcus Creutzburg1, Heshmat Noei1, and Andreas Stierle1,2 — 1Deutsches Elektronen-Synchrotron (DESY), D-22603 Hamburg, Germany — 2Fachbereich Physik Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
Magnetite (Fe3O4) is an important transition metal oxide with diverse applications in catalysis, data storage and biomedical imaging. In this study, we grow model catalyst magnetite nanoparticles on Al2O3(0001) surface under UHV conditions and at different temperatures: 150, 300, 500, and 700°C. Grazing incidence X-ray diffraction (GIXRD) and microscopy techniques were assisted in defining the facet and morphology of the developed nanoparticles, respectively. GIXRD outcomes indicated the formation of 111 oriented nanoparticles. Fourier transmission infrared reflection-absorption spectroscopy (FTIRRAS) was performed to study the adsorption of formic acid on magnetite/Al2O3 samples. The results demonstrate different types of adsorption and dissociation of formic acid. The results of this study can be applied as a paradigm in order to provide insight into the fundamental surface science of the next generation of the hierarchical organic-linked magnetite.