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O: Fachverband Oberflächenphysik

O 39: Oxides and Insulator Surfaces: Adsorption and Reaction of Small Molecules I

O 39.2: Vortrag

Dienstag, 18. März 2025, 14:15–14:30, H4

Structure and oelic acid adsorption properties of magnetite nanoparticles on SrTiO₃ — •mohammad ebrahim haji naghi tehrani^1,2, lucio martinelli³, daniel silvan dolling^1,2, marcus creutzburg¹, ming chao kao^1,2, alexander meinhardt^1,2, mona kohantorabi¹, heshmat noei¹, and andreas stierle^1,2 — ¹Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — ²Fachbereich Physik Universität Hamburg, Hamburg, Germany — ³Institut Néel, CNRS, Grenoble INP, Université Grenoble Alpes, Grenoble, France

The underlying explanation for the exceptional mechanical properties of hierarchically arranged magnetite nanoparticle super-crystals is closely linked to understanding the oxide-organic interface between the magnetite nanoparticles (NPs) and the oleic acid (OA) molecules. We studied the shape and surface structure changes of the magnetite NPs induced by crosslinking the OA molecules. In this regard, magnetite NPs were grown by reactive physical vapor deposition on a strontium titanate single crystalline surface (STO(001)). The structural and morphological changes in the NPs were monitored under ultra-high vacuum (UHV) conditions employing synchrotron-based grazing incidence X-ray diffraction (GIXRD). We evidenced the growth of (001) oriented magnetite NPs with predominant (111) side facets. Additionally, our results indicate an increase in the NP lattice constant after OA adsorption, which may be attributed to the incorporation of oxygen vacancies.

Keywords: Magnetite; Nanoparticle; Oleic acid