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DS: Fachverband Dünne Schichten
DS 13: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides II (joint session DS/MM/O)
DS 13.6: Vortrag
Donnerstag, 21. März 2024, 11:30–11:45, A 053
Effect of Surface Terminations on the Water Intercalation into Ti3C2Tz MXene Thin Films — Aditya Sharma1, Thierry Ouisse1, Ulf Wiedwald2, Andrei Chumakov3, Fabrice Wilhelm4, and •Hanna Pazniak1 — 1Université Grenoble Alpes, CNRS, Grenoble INP, LMGP, Grenoble, France — 2University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen, Duisburg, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 4European Synchrotron Radiation Facility, Grenoble, France
MXenes are 2D materials whose surface is terminated by functional groups that drastically affect the properties of MXenes, including their affinity for water. In this study, we synthesized Ti3C2 MXenes with 1) mixed (=O, -F, and -OH) and 2) halogen (-Cl) terminations and prepared thin films by drop casting. X-ray absorption near edge structure shows different local chemical environment of Ti depending on the terminations, which is also confirmed by density functional theory. Next, we expose the MXene thin films to various humidity levels and studied the water intercalation by wide angle X-ray scattering. We observed that the interplanar spacing of mixed-terminated MXenes varied from 11.74 Å to 16.97 Å with increasing relative humidity from 0% to 100%, respectively. In the Cl-terminated MXenes, however, the interplanar spacing remains much smaller and only changes from 11.0 Å to 12.8 Å as function of relative humidity. In both cases, the process of water intercalation is reversible.
Funded by ANR-23-CE09-0031-01 project.
Keywords: MXenes; water intercalation; interplanar spacing; wide andgle X-ray scaterring; X-ray absorption near edge structure