ZnS:Mn量子点作为荧光离子探针测定痕量铜(Ⅱ)

采用油相法合成了锰掺杂硫化锌(ZnS:Mn)半导体纳米晶,以水杨醛席夫碱与其进行配体交换,将席夫碱修饰于纳米晶表面。在优化的实验条件下,铜离子的加入使ZnS:Mn荧光出现强烈的猝灭作用。体系荧光强度的降低与Cu2+浓度呈现良好的线性关系,据此建立了测定Cu2+的新方法,其线性范围为2.50×10-7～6.25×10-5 mol.L-1,线性校正方程为1-F/F0=-9.21×10-3+1.60×105 C2Cu+,回归系数r=0.992,检测限为1.11×10-7 mol.L-1。本方法应用于自来水中Cu2+的测定,结果满意。

ZnS:Mn quantum dots as fluorescence probes for determination of copper ions

Mn-doped ZnS nanocrystals are synthesized via colloidal synthetic technique and capped with Schiff base using ligand exchange.The presence of copper ion results in fluorescence quench of quantum dot.A good linear relationship exists in the concentration range from 2.50×10-7 mol·L-1 to 6.25×10-5 mol·L-1 and the detection limit is 1.11×10-7 mol·L-1.The proposed method was used to the determination of Cu2+ in the tap water with the recovery 91%-105%.