Herein, Chemiluminescence (CL) behaviour of carbon dots (CDs) was investigated by using HO as co-reactant in alkaline solution. The study demonstrated O, OH and O involved in the CL reaction processes. These reactive oxygen species reacted with CDs to produce CD and CD, then the CD reacted with CDto generate energy release in the form of CL emission. Importantly, we found that Cu ion could greatly enhanced CL intensity (7.5 times) of CDs-HO system, which was ascribed to Cu-catalysed HO decomposition. Based on this system, the CL assay of ascorbic acid (AA) was developed. The limit of detection was as low as 0.03 μM, and the linear range was from 0.1 μM to 100 μM. The proposed method has been successfully utilized to determinate AA in beverage samples with satisfactory results.
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