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HL: Fachverband Halbleiterphysik

HL 4: 2D Materials and their Heterostructures I (joint session DS/HL)

HL 4.3: Vortrag

Montag, 17. März 2025, 15:30–15:45, H3

Iron Diffusion in Thermally Stable Ti₃C₂Cl₂ MXenes under UHV Conditions — •Moritz Vanselow¹, Maksim Riabov², Hanna Pazniak², Thierry Ouisse², and Ulf Wiedwald¹ — ¹University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen, Germany — ²Université Grenoble Alpes, CNRS, Grenoble INP, LMGP, France

MXenes are 2D materials derived from a MAX phase precursor. Molten salt etching of Ti₃C₂Cl₂ results in hydrophobic Ti₃C₂T_X MXenes with T_X = -Cl as a termination species [1]. Ti₃C₂Cl₂ MXenes are deposited on Si(100)/SiO₂ and we in situ study its chemical stability by mass spectrometry and Auger electron spectroscopy in ultrahigh vacuum. Compared with standard hydrophilic Ti₃C₂T_X MXenes, where T_X = -F, =O, and -OH, fluorine and hydroxyl groups can be removed by annealing at temperatures up to 1000 K, the thermal stability of Ti₃C₂Cl₂ MXenes is significantly enhanced. Moreover, intercalated water changing the MXene sheet separation, is not present in hydrophobic Ti₃C₂Cl₂ as proven by ex situ X-ray diffraction, wide-angle X-ray scattering (WAXS) and X-ray photoelectron spectroscopy (XPS). After optimizing the annealing procedure, we in situ intercalate Fe by e-beam assisted deposition on top of MXene thin films and subsequent Fe diffusion by soft annealing at 600 K. This work is funded by a joint ANR-DFG-Project under ANR-23-CE09-0031-01 and DFG ID 530103526. [1] T. Zhang et al., Chem. Mater. 36, 1998 (2024).

Keywords: MXene; Ti3C2Cl2; Thermal stability; Fe diffusion; UHV Conditions