Hydrogen peroxide enhanced glow-type chemiluminescence of hydrazine hydrate modified carbon quantum dots-potassium persulfate system.

Most known chemiluminescence (CL) systems are flash-type that generate weak luminescence and decline quickly after dozens of seconds, while the glow-type CL systems have stable emission for an extended period to achieve accurate quantitation. In this work, a long-term CL system based on hydrazine-hydrate (N ₂ H ₄ ·H ₂ O) modified carbon quantum dots (N-CQDs) as a luminescent probe, with K ₂ S ₂ O ₈ and H ₂ O ₂ as co-reactants, was proposed. The CL emission enhanced by H ₂ O ₂ increased 18-fold more than that of N-CQDs and K ₂ S ₂ O ₈ direct reaction, and decayed by 5% of the maximum intensity over 700 s. In the reaction system, K ₂ S ₂ O ₈ and H ₂ O ₂ co-reactants can promote each other to continuously generate corresponding radicals (•OH, O ₂ ^•- , ¹ O ₂ ), which in turn trigger the CL emission of N-CQDs. This phenomenon was identified as the primary cause for the production of persistent CL. In addition, a stable and selective CL sensor based on the N-CQDs-K ₂ S ₂ O ₈ -H ₂ O ₂ CL enhancing system was developed for ascorbic acid quantitation in the linear range from 0.1 to 10.0 mM with a detection limit of 0.036 mM. The method has been applied to the analysis of tablet samples and holds potential in pharmaceutical analysis field.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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