Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 50: Supported Nanoclusters: Structure, Reaction, Catalysis
O 50.1: Talk
Wednesday, March 20, 2024, 10:30–10:45, TC 006
Interaction of Formate with Magnetite Nanoparticles Supported by Al2O3(0001) — •Mohammad Ebrahim Haji Naghi Tehrani1,2, Daniel Silvan Dolling1,2, Jan-Christian Schober1,2, Esko Erick Beck1,2, Mona Kohantorabi1, Arno Jeromin1, Thomas F. Keller1, Vedran Vonk1, Heshmat Noei1,3, and Andreas Stierle1,2 — 1Deutsches Elektronen-Synchrotron (DESY), D-22603 Hamburg, Germany — 2Fachbereich Physik Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany — 3Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Hamburg, Germany
We studied the growth and adsorption properties of magnetite nanoparticles (NPs) grown on Al2O3(0001) support by means of physical vapor deposition. Grazing incidence X-ray diffraction (GIXRD) characterization indicated the formation of epitaxial (111)-oriented NPs. Scanning electron microscope (SEM) showed triangular-shaped NPs. Adsorption of formic acid as a probe molecule was studied on the magnetite NPs using Fourier transmission infrared reflection-absorption spectroscopy (FTIRRAS). According to the results, formate adsorbs in the forms of chelating and quasi-bidentate geometries on these NPs, similar to what we recently evidenced on a (111) magnetite single crystal surface. Moreover, X-ray photoelectron spectroscopy (XPS) proved a possible phase transition from magnetite to maghemite after air exposure. Our model system can be applied in order to design the next generation of hierarchical organic-linked magnetite.
Keywords: Magnetite; Nanoparticle; Formic acid