Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 39: Hydrogen in Materials II
MM 39.3: Talk
Friday, March 13, 2026, 10:45–11:00, SCH/A215
Local hydrogenation of polycrystalline Pd nanodisks studied with in-situ TEM — •Svetlana Korneychuk1,2, Carl Andersson3, Stefan Wagner1, Christoph Langhammer3, and Astrid Pundt1 — 1IAM-WK, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2KNMFi, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Chalmers University of Technology, Göteborg, Sweden
Hydrogen distribution and concentration in metals is of central importance for many areas of hydrogen technology, such as hydrogen storage, detection, and hydrogen embrittlement. In particular, arrays of Pd nanodisks can serve as optical hydrogen sensors [1] at room temperature owning to fast kinetics of hydrogen absorption and desorption of Pd. Here we demonstrate hydrogen distribution and concentration in polycrystalline Pd nanodisks with the lateral resolution down to 4 nm extending our previous study on the local measurement of hydrogen concentration in Pd nanoparticles with in-situ TEM [2]. By measuring the shift of the Pd bulk plasmon peak with scanning transmission electron microscopy combined with energy electron loss spectroscopy during in-situ hydrogen gas loading and unloading, local detection of the hydrogen concentration is achieved in TEM. The method offers a way to observe hydrogen concentration at different sites: grain boundaries, surface and grains starting from early stages of hydrogenation to compete hydride formation identifying the pathways of hydrogenation of polycrystalline metals. [1] C. Wadell, et al., ACS Nano 2014 8 (12), 11925-11940 [2] S. Korneychuk, et al., Small 2025, 21, 2407092.
Keywords: hydrogen; polycrystalline metal; in-situ gas TEM; EELS