Detection of Melamine Based on the Fluorescence Changes of Nitrogen-Doped Carbon Dots

Figure 4

The fluorescence emission spectra of NCDs-Hg²⁺ mixed solution (black line), melamine-Hg²⁺-NCDs mixed solution (red line), melamine-NCDs-Hg²⁺ mixed solution (blue line), and NCDs-Hg²⁺-melamine mixed solution (gray line) (λ_ex = 370 nm, NCDs were diluted five times, Hg²⁺ = 1.2 mM, melamine = 3 mg/L).