胸腺嘧啶修饰的Mn:ZnS量子点作为室温磷光传感器用于Hg2+的检测  

Thymine modified Mn:Zn S quantum dots as room temperature phosphorescence sensors for Hg detection

作　　者：尹笑 巩岩[1] YIN Xiao;GONG Yan(School of Life Sciences,Shanxi Normal University,Linfen 041004)

机构地区：[1]山西师范大学生命科学学院,临汾041004

出　　处：《分析试验室》2021年第4期385-389,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(31700876,31700862);山西省自然科学基金(201601D021106)资助。

摘　　要：采用胸腺嘧啶修饰的Mn:ZnS量子点作为室温磷光传感器检测Hg^(2+)。量子点溶液在加入Hg^(2+)后,磷光强度迅速下降并在15 min内达到稳定。Hg^(2+)对量子点的磷光猝灭方式是动态猝灭与静态猝灭相结合,Hg^(2+)与量子点在激发态相互作用导致量子点动态猝灭,并且在静态猝灭过程中,Hg^(2+)和胸腺嘧啶在基态相互作用形成T-Hg^(2+)-T的发夹结构产生了不发光的络合物。在最优反应条件下,量子点的磷光强度随Hg^(2+)的浓度在2~18μmol/L范围内呈良好的线性关系(R^(2)=0.9992)。When Hg^(2+)was added into the quantum dots solution,the phosphorescent intensity decreased rapidly and stabilized within 15 min.The phosphorescence quenching mode of Hg^(2+)on quantum dots was the combination of dynamic quenching and static quenching.The interaction between Hg^(2+)and quantum dots in the excited state led to the dynamic quenching of quantum dots.In the static quenching process,the interaction between Hg^(2+)and thymine in the ground state formed the hairpin structure of T-Hg^(2+)-T and produced nonluminescent complex.Under the optimal reaction conditions,the phosphorescence intensity of quantum dots had a good linear relationship(R^(2)=0.9992)with the concentration of Hg^(2+)in the range of 2-18μmol/L.

关 键 词：胸腺嘧啶 Mn:ZnS量子点 汞 T-Hg^(2+)-T 室温磷光 

分 类 号：O657.3[理学—分析化学]