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O: Fachverband Oberflächenphysik
O 76: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides II (joint session DS/MM/O)
O 76.2: Vortrag
Donnerstag, 21. März 2024, 10:00–10:15, A 053
In situ monitoring of surface termination of Ti3C2Tx MXene with Raman spectroscopy — •Julian Plaickner1,2, Tristan Petit2, Peer Bärmann2, Thorsten Schultz2,3, Norbert Koch2,3, and Norbert Esser1,4 — 1Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, 10623 Berlin — 2Hardenbergstrasse 36 — 3Institut für Physik & IRIS Adlershof, Humboldt Universität zu Berlin, 12489 Berlin — 4Leibniz Institut für Analytische Wissenschaften ISAS eV, Schwarzschildstrasse 8, 12489 Berlin
In the last years, MXenes have attracted attention due to an interesting combination of physical properties. A better knowledge of the surface chemistry of MXenes is critical for the implementation in applications. A promising investigation approach is annealing-induced desorption of surface terminations, because it might make the surface very active for further functionalizations. In this work, the effect of annealing on the Ti3C2Tx MXene surface chemistry in UHV has been investigated with Raman spectroscopy in ultra-high vacuum. Changes in the Raman spectra are correlated with the desorption of the major part of the F surface termination at 650 °C. Most of the observed spectral features show a significant broadening already before annealing. We attribute this to the intrinsic disordered nature of the MXenes due to a mixed surface termination and a broad background associated to electronic Raman scattering. With this study we identified of the vibrational signatures associated with F-termination and provided new insights into the interpretation of the vibrational spectra of Ti3C2Tx MXenes.
Keywords: Mxene; Raman spectroscopy; ultra high vacuum; surface termination