Regensburg 2025 – scientific programme

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DS: Fachverband Dünne Schichten

DS 13: Poster

DS 13.8: Poster

Thursday, March 20, 2025, 18:00–20:00, P1

Thin films of atomically precise chiral bismuth oxido nanoclusters — •Dominik Hornig¹, Rico Thomas¹, Annika Morgenstern², Franziska Schölzel², Thi Ngoc Ha Nguyen², Christoph Tegenkamp², Georgeta Salvan², and Michael Mehring¹ — ¹TU Chemnitz, Institute of Chemistry, Germany — ²TU Chemnitz, Institute of Physics, Germany

The adsorption of chiral molecules on metallic surfaces induces electron spin polarization at the interface, enabling novel applications in chiral opto-spintronics. This effect, known as chiral-induced spin selectivity (CISS), strongly depends on the binding and ordering of the species on surfaces.[1] In our studies, we investigate the adsorption behavior of chiral bismuth oxido nanoclusters (BiO-NCs) on gold (Au) surfaces. The chiral BiO-NCs represent monodisperse nanoclusters which can be modulated by an exchangeable ligand shell. This has been demonstrated for the stable [Bi₃₈O₄₅] cluster architecture and enables targeted modification of the BiO-NC with regard to optical properties.[2,3] By functionalizing BiO-NCs with amino acids such as Boc-L-methionine and Boc-L-phenylalanine, the chiral nanoclusters [Bi₃₈O₄₅(Boc-L-Met-O)₂₄] or [Bi₃₈O₄₅(Boc-L-Phe-O)₂₄] were synthesized. Furthermore, tuning of physical properties is possible by doping these atomically precise nanoclusters with other metals. Here we present the preparation of thin films of atomically precise chiral BiO-NCs and results of ellipsometry, UV-Vis, STM and STS measurements. [1] Nat. Rev. Chem. 2019, 3, 250-260. [2] Langmuir 2024, 40, 16320-16329.[3] Nanomaterials 2022, 12, 1815.

Keywords: SYMS; Thin films