Carbon dots (CDs) with different doping elements were successfully synthesized via a simple hydrothermal strategy. 3-amino-4-chlorophenylboronic acid, 3-aminobenzeneboronic acid, aniline, and benzene were used as precursors, respectively. The B/N co-doping CDs (BNCDs) derived from 3-aminobenzeneboronic acid show brightest fluorescence among the CDs products with quantum yield at 0.15. The fluorescence of BNCDs exhibits good photostability and excitation-independent emission behavior. The bright blue emission of BNCDs can be quenched by serine, which is a kind of neutral aliphatic amino acid containing hyroxyl groups with polarity. It is possibly due to the molecular collision between excited state of BNCDs and the ground state of serine. BNCDs can be served as fluorophore probe for the assay of serine based on the efficient quenching effect. The approach for the determination of serine shows a high sensitivity with a detection limit at 0.14 nM, which is lower than those of previous works. Furthermore, the present BNCDs system can be employed to monitor serine in real food and biological samples. The strategy may be a potential way for the application in food safety and biomedicine fields.

通过简单的水热策略成功合成了具有不同掺杂元素的碳点（CD）。3-氨基-4-氯苯基硼酸，3-氨基苯硼酸，苯胺和苯分别用作前体。衍生自3-氨基苯硼酸的B / N共掺杂CD（BNCD）在CD产品中显示最亮的荧光，量子产率为0.15。BNCD的荧光表现出良好的光稳定性和激发无关的发射行为。BNCD的亮蓝色发射可以被丝氨酸淬灭，丝氨酸是一种带有极性极性基团的中性脂肪族氨基酸。这可能是由于BNCD的激发态与丝氨酸基态之间的分子碰撞所致。基于有效的猝灭作用，BNCD可作为荧光探针用于丝氨酸的测定。测定丝氨酸的方法显示出高灵敏度，检测极限为0.14 nM，低于以前的工作。此外，本BNCDs系统可用于监测真实食品和生物样品中的丝氨酸。该策略可能是在食品安全和生物医学领域中应用的潜在方法。