Figure 12

TEM images of the as-synthesized Cu₂S QDs in PBS buffer solution (pH = 6.98) (a) and the presence of Hg²⁺ (1 × 10^–7 mol/L) (b); size and size distribution of the as-synthesized Cu₂S QDs in PBS buffer solution (pH = 6.98) (c) and QDs in the presence of Hg²⁺ (1 × 10⁻⁷ mol/L) (d).