A highly selective fluorescent probe for sulfide ions based on aggregation of Cu nanocluster induced emission enhancement

S²⁻ ions can enhance the fluorescence of cysteine-capped Cu nanoclusters (Cu NCs) as a result of the S²⁻ ion-induced aggregation of the dispersed Cu NCs. In addition, a highly selective fluorescent probe was developed for the determination of H₂S from toys called “Fart Bomb”.