Fig. 3: Characterizations of 2D polycrystalline oxides.

TEM images, magnified TEM images, HRTEM images and the corresponding SAED patterns, XRD, AFM and corresponding atomic structures of 2D TiO₂ (a) 2D CuO (b) 2D ZrO₂ (c) 2D In₂O₃ (d), and 2D SnO₂ (e). The insets showed the corresponding EDS mappings.