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Acceleration of the chemical delamination of Ti3AlC2 crystals in the presence of chloroauric acid with the formation of 2D MXenes

A.V. Parfeneva,V.P. Ulin,E.K. Khrapova,M.V. Tomkovich,G.V. Li,A.M. Rumyantsev,D.A. Kirilenko,E.V. Beregulin,A.A. Krasilin,E.V. Astrova

A method for accelerated synthesis of 2D MXenes Ti 3 C 2 T x from the MAX phase Ti 3 AlC 2 by selective etching of Al in acidic fluoride-contained solutions in the presence of HAuCl 4 as a catalyst is proposed. The results of characterization of the etching products using scanning and transmission electron microscopy, X-ray diffraction analysis, energy-dispersive X-ray spectroscopy and 4-probe resistivity measurements are presented. It is shown that the introduction of HAuCl 4 into the etching solution increases the rate of aluminum removal from the precursor crystals and increases the efficiency of their separation into 2D layers. The mechanism of such acceleration is a transfer of the hydrogen gas release region from the distributed front of aluminum dissolution inside the crystal to the clusters of gold formed on its outer surfaces.