Mulberry Juice-Derived Carbon Quantum Dots as a Cu²⁺ Ion Sensor: Investigating the Influence of Fruit Ripeness on the Optical Properties

Figure 11

(a) The intensity of CQD with the concentration of Cu²⁺ ions, (b) the PL intensity of CQDs with Cu²⁺ in different concentrations, and (c) the error bar of CQDs with Cu²⁺ in different concentrations.

(a)

(b)

(c)