Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 61: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides I (joint session DS/MM/O)
O 61.1: Hauptvortrag
Mittwoch, 20. März 2024, 15:15–15:45, A 053
Sustainable synthesis of MXenes and their precursors — •Jesus Gonzalez-Julian1, Nima Amousa1, and Filipa Oliveira2 — 1Chair of Ceramics, Institute of Mineral Engineering (GHI), RWTH Aachen University, 52074 Aachen, Germany — 2Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology Prague, 166 28 Prague 6, Czech Republic
Synthesis of MXenes is typically performed using HF - or forming in-situ HF through the reaction between LiF and HCl, but this chemical etching presents some limitations. HF is highly corrosive and toxic, requiring specific safety regulations, and the chemical etching is highly exothermic, limiting the amount of MXenes that can be produced in the range of grams. These two points are hindering the transfer of MXenes to real applications, despite the excellent properties of these 2D materials. Consequently, new synthesis processes are required to overcome these problems. In this work, we will present a novel sustainable synthesis route for the synthesis of the precursors (MAX phases) and the chemical etching, which is referenced as Molten Salt Shielded Synthesis or MS3. MS3 is carried out at lower temperatures than conventional synthesis routes, in air instead inert atmospheres, and does not require any milling step to obtain fine and loose powders.
Keywords: Mxene; Sustainability; MAX phases; Molten Salts; Functionalization