fig3

Figure 3. (A) Schematic illustration of the synthesis of Ti₃C₂T_x by HF. This figure is quoted with permission from Naguib et al. Copyright (2011) John Wiley and Sons^[35]. (B) Schematic illustration of the preparation of Ti₃C₂T_x by HCl + LiF. This figure is quoted with permission from Ghidiu et al. Copyright (2014) Springer Nature^[37]. (C) Schematic illustration of the preparation of Ti₄N₃T_x by high-temperature molten salt method. This figure is quoted with permission from Urbankowski et al. Copyright (2016) RSC Pub^[42]. (D) Schematic illustration of the synthesis of Ti₃C₂T_x by organic polar solvents. (E) TEM image of delaminated Ti₃C₂T_x sheets etched by organic polar solvents. This figure is quoted with permission from Natu et al. Copyright (2020) Elsevier^[43]. (F) Schematic illustration of the preparation of Ti₃C₂T_x by alkali etching. This figure is quoted with permission from Li et al. Copyright (2018) John Wiley and Sons^[45]. (G) Schematic illustration of the synthesis of Ti₃C₂T_x by Lewis acidic molten melts etching. This figure is quoted with permission from Li et al. Copyright (2019) American Chemical Society^[46]. (H) Schematic illustration of the preparation of Ti₃C₂T_x by halogen etching. This figure is quoted with permission from Jawaid et al. Copyright (2021) American Chemical Society^[47].