Abstract
Despite the rising interest in carbon dots (CDs) for applications as nano sensors, rapid and reproducible synthesis of CDs is a crucial problem forscalable production and practical application. The microreactor system was applied in this work for continuous synthesis of functionalized carbon dots with high monodispersity. Nitrogen and sulfur co-coped CDs were produced from L-cysteine and citric acid through coil microreactor in 10 min. The obtained N, S co-coped CDs had a shape of nearly sphere with an average diameter of 2.8 nm. The CDs exhibited bright blue fluorescence when excited upon ultraviolet light, reaching a high quantum yield at 68.2%. The fluorescence could be selectively quenched by Cd2+ and were demonstrated suitable for Cd2+ detection with high sensitivity and excellent selectivity. In this study, the N, S co-coped CDs reached the detection limit of 0.079 ppb within a wide linear range from 0 ppb to 300 ppb. In addition, this detection method held a strong anti-interference ability in complex ionic environments and was demonstrated low cell-toxicity, indicating promising applications in Cd2+ detection.
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