Figure 3

(a) Low–magnification high-angle annular bright field scanning TEM (HAABF-STEM) image of TOH Au NCs. (b and c) are HAADF-STEM and secondary electron scanning TEM images, respectively, corresponding to (a). (d₁, d₃, d₅, d₇) High-magnification HAADF-STEM images of individual TOH Au NCs viewed from different orientations. (d₂, d₄, d₆ and d₈) are the corresponding geometrical models for (d₁, d₃, d₅ and d₇), respectively. (d₁, d₂: [100], d₃, d₄: [110], d₅, d₆: [111] and d₇, d₈: [441]). (e) Atomic resolved HAADF-STEM image of TOH Au NCs taken along the [110] direction, showing the (441) surface, (110) terraces and (001) step. Top-left corner inset of (e) is the corresponding indexed FFT pattern along the [110] zone axis. The middle inset of (e) is the simulated atomic arrangement of {110} facets, showing the projected {110} {111}, {221}, {331} and {441} crystal planes along the [110] direction.