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![Structure of Ti3C2Cl2 MXene. (A) The structure of Ti3C2Cl2 MXene can be approximated using P63/mmc space group with the two lattice parameters: in-plane, a, and out of plane, c. Experimental XRD patterns (Cu Kα, reflection, black curve), Le Bail fits (red curve) and the corresponding residues (orange curves) of (B) Ti3C2Cl2 MXene derived from (C) Ti3AlC2 MAX phase.The successful MXene synthesis can be visualized from the shift of (0002) and (112̅0) peaks to lower angles compared to that of the parent MAX phase. In the direct space these changes are reflected by the increase of both a and c lattice parameters. Initial Ti3AlC2 MAX phase contains small amounts of bulk fcc-TiCx (Fm-3m space group) impurity which propagates into the final MXene product. (D) Atomic-column resolved HAADF image of Ti3C2Cl2 MXene. The electron beam is parallel to [21̅1̅0] zone axis. (E) The EDX elemental line scans of Ti3C2Cl2 MXene using Ti Kα and Cl Kα suggest presence of Cl surface groups on each Ti3C2 sheet. Due to their low Z contrast, C atoms could not be observed. Credit: Science Advances, doi: 10.1126/science.aba8311](https://passive-components.eu/wp-content/uploads/2020/07/Mxene-350x250.jpg)
