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以L-半胱氨酸为碳源、硫源及氮源, 一步水热法制得水溶性好、稳定性高的硫氮共掺杂碳量子点SN-CDs.基于Pb2+对其荧光的淬灭作用, 构建了高选择性与高敏感度的荧光探针, 可应用于Pb2+的快速检测.运用透射电镜、紫外-可见吸收光谱、Fourier红外光谱和荧光光谱表征了SN-CDs的结构及光学性能.结果表明, Pb2+浓度在2～50μmol/L范围内, 与SN-CDs的荧光淬灭率之间呈良好的线性关系, 相关系数为0.9992, 检出限为0.2μmol/L.方法用于自来水中Pb2+的测定, 回收率为94.7％～100.7％.“,”Using L-cysteine as carbon, nitrogen and sulfur source, the sulfur and nitrogen co-doped carbon dots SN-CDs with excellent water-soluble and stable property were synthesized by one-step hydrothermal method. Based on the fluorescence quenching effect of lead (II)on SN-CDs, a fluorescent method with high selectivity and sensitivity was established. It was used to quickly determine the amount for lead (II)ions. The structure and luminescence properties of SN-CDs were characterized by TEM, ultraviolet-visible absorption, Fourier transform infrared spectroscopy and fluorescence spectrum. The results showed that the fluorescence quenching rate had a linear response to lead (II)in the concentration range of 2 to 50μmol/L, with a correlation coefficient of 0. 9992 and a detection limit of 0. 2μmol/L. The method was used for determining lead (II)in the tap water samples, and the recovery was 94. 7％ ～ 100. 7％.