Figure 5

(a) Effects of NAC/Cu²⁺ molar ratio on the fluorescence intensity of Cu₂S QDs; (b) Effects of NAC/Cu²⁺ molar ratio on the QDs size and size distribution of Cu₂S QDs in solution; (c) and (d)TEM images of the Cu₂S QDs synthesized with the molar ratio of NAC/Cu²⁺ = 1:1 and 6:1.