Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Magnetic Particles and Clusters

MA 18.3: Talk

Monday, March 16, 2020, 17:15–17:30, HSZ 403

Unravelling the Nucleation, Growth, and Faceting of Magnetite-Gold Nanohybrids — Yulia A. Nalench¹, Igor V. Shchetinin¹, Alexander S. Skorikov², Pavel S. Mogilnikov¹, Michael Farle³, Alexander G. Savchenko¹, Alexander G. Majouga^1,2,4, Maxim A. Abakumov^1,5, and •Ulf Wiedwald^1,3 — ¹National University of Science and Technology MISIS, Moscow, Russia — ²Lomonosov Moscow State University, Russia — ³Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Germany — ⁴D. Mendeleev University of Chemical Technology of Russia, Moscow, Russia — ⁵Department of Medical Nanobiotechnology, Russian National Research Medical University, Moscow, Russia

We study the nucleation and growth processes of Fe₃O₄−Au hybrid NPs in detail by taking probes of the reaction mixture during synthesis and analysis using laboratory equipment (TEM, XRD, and magnetometry) for typically 10 µL samples. From the three independent experiments we extract the NP size at 12 stages of the synthesis showing identical trends and good quantitative agreement. Two independent processes occur during synthesis of Fe₃O₄−Au NPs, the nucleation and growth of spherical Fe₃O₄ NPs on the surface of Au seeds during the heating stage and their faceting towards octahedral shape during reflux. Stopping the reaction at a certain point allows to adjust the NP size and shape improving e.g. their capabilities in biomedical applications.