Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Crystallization, Nucleation and Self-Assembly

CPP 41.7: Vortrag

Donnerstag, 8. September 2022, 17:00–17:15, H39

In situ small-angle X-ray scattering and total scattering to study CuPd nanoparticle growth and self-assembly — •Kilian Frank¹, Davide Derelli², Dorota Koziej², and Bert Nickel¹ — ¹Faculty of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany — ²University of Hamburg, Institute for Nanostructure and Solid-State Physics, Center for Hybrid Nanostructures, 22761, Hamburg, Germany

Combining noble metals with abundant materials is a promising design strategy for new catalytic nanomaterials, e.g. for CO₂ reduction. Reliable synthesis routes of nanoparticles with a low size dispersity are required, but often an understanding of the formation pathway is lacking. Therefore, we investigated the entire synthesis of CuPd alloy nanoparticles using simultaneous small-angle X-ray scattering (SAXS) and the atomic pair distribution function obtained from total scattering (TS) to establish the sequence of structures from the atomic level to the nanoscale. We use a dedicated reaction cell for heating and stirring at the high-energy beamline P07 (PETRA III, DESY), extending our previous studies on cobalt oxide nanoparticle formation (https://doi.org/10.1038/s41467-021-24557-z). We characterize the transformation of precursors and early nucleation by TS, and the subsequent particle growth and assembly by SAXS in a model-based analysis. Upon cooling, we observe a rich temperature-dependent phase behavior of particle assemblies. These can serve as a potential templating strategy for efficient particle-based catalysts.