Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Catalysis and surface reactions I
O 34.5: Vortrag
Dienstag, 10. März 2026, 11:30–11:45, HSZ/0204
2D TiS2 Nanoparticles in reductive and oxidative Atmospheres as Model (Photo-)Catalysts — •Niko Kruse1, Justin Klimek1, Aaron von Seggern1, Martin Hedevang2, Sergi Camposs Jara2, Jeppe Vang Lauritsen2, and Lars Morhusen1 — 1Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany — 2iNano Center, Aarhus University, Aarhus, Denmark
Sustainable materials for the thermal and photochemical utilization of (waste) carbon dioxide (CCU) become more and more demanded.[1] Titanium-based 2D materials such as TiS2 can directly harvest sunlight and have demonstrated high CO2 conversion activity.[2] To illuminate atomistic structure-property relationships of such catalytic systems, we present a model system consisting of 2D TiS2 nanoparticles on Au(111) and TiO2 (110) surfaces, rendering it suitable for atomic-level microscopy and spectroscopy. A direct synthesis route was developed by Ti metal evaporation in the presence of benign organic S precursors.[3] The resulting materials were characterized by combined STM, XPS, and NEXAFS experiments, along with DFT calculations.[4] We demonstrate the substrate-dependent structure and compositional detail of the nanoparticles and highlight the chemical potential of S as the relevant shape descriptor. In addition, the surface chemistry of 2D TiS2 nanoparticles in reactive atmospheres will be presented, highlighting the strong stability even in oxidative & reductive conditions. [1] R. Guil-López, N. M. et al., Materials 2019, 12. 3902. [2] A. Aljabour, et al, ACS Catal. 2020, 10, 66. [3] F. Besenbacher et al., J. Catal. 2021, 403, 4. [4] N. Kruse et al., Small 2025, 21, e06023.
Keywords: Titanium-based nanomaterials; Model studies; Scanning tunneling microscopy (STM); X-ray photoeletron spectroscopy (XPS); Near-edge X-ray absorption fine structure (NEXAFS)