Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Catalysis and surface reactions III

O 88.10: Vortrag

Donnerstag, 12. März 2026, 17:15–17:30, TRE/MATH

Heteroepitaxial growth of Sm₂O₃ nanoislands on Cu(111) — •Björn Riedel¹, Raquel Sánchez-Barquilla¹, Lars Buß¹, Iulia Cojocariu², Tevfik Onur Mentes², Andrea Locatelli², and Jan Ingo Flege¹ — ¹Brandenburg University of Technology, Cottbus, Germany — ²Elettra-Sincrotrone Trieste, Basovizza, Italy

Doping of CeO₂ with samarium can significantly influence its redox behavior by promoting the formation and stabilization of reduced Ce³⁺ species. Yet, studies of well-defined samaria model systems grown on single-crystal surfaces are scarce, leading to a lack of combined structural and spectroscopic studies and, hence, a gap in understanding the relationship between samaria’s structure and its chemical behavior. We have investigated hexagonal and monoclinic Sm₂O₃ nanoislands grown on Cu(111) using a multi-method approach with high structural and chemical sensitivity, employing low-energy electron microscopy (LEEM), micro-spot diffraction (µLEED) and intensity-voltage LEEM in combination with X-ray absorption spectroscopy photoemission electron microscopy (XAS-PEEM). To study the influence of different structures and phases on the chemical behavior of Sm₂O₃ islands, we have examined their redox properties under reducing (H₂) and oxidizing (O₂) conditions. The results indicate a highly dynamic system that can be readily adjusted by varying the conditions during deposition, such as growth temperature and oxygen partial pressure.

Keywords: model catalyst; samaria; LEEM; XAS-PEEM