摘要
铜是人体必需的微量元素,但过量的铜的摄入会扰乱细胞的内稳态,引起不同类型的神经退行性疾病.近年来,随着工业的发展,大量的铜通过各种途径泄漏到环境中,成为大量的饮用水污染物.因此,开发高灵敏度、高选择性的铜离子探测探针是十分必要和具有挑战性的.本文采用成本低、操作简单的MRI增强量子点-CuInS2/ZnS/GdS材料作为选择性铜(Cu^(2+))离子探针,对离子进行高灵敏度、高选择性的检测.当加入不同浓度的Cu^(2+)时,CuInS2/ZnS/GdS量子点的荧光强度降低,而加入其他金属离子(如Al^(3+)、Sn^(2+)、Zn^(2+)、Fe^(2+)、Mn^(2+)、Ca^(2+)、Na+和Gd^(3+))时,量子点的荧光强度不变.计算得到的Cu^(2+)检出限可低至0.5ppb.该方法的感应机制可能是Cu^(2+)诱导CuInS2/ZnS/GdS量子点聚集和沉淀而导致的荧光猝灭.
Copper is a trace element essential to organism,but unregulated presence of excess copper can disturb the cellular homeostasis which will cause different neurodegenerative diseases.As the growing of industry,some amount of copper leak into the environment through various routes and become an abundant pollutant of drinking water In recent years.It is therefore essential and challenging to develop highly sensitive and selective probes for copper ion detection.In this paper,low cost and easy operation material MRI enhansed quantum dot-CuInS2/ZnS/GdS was used as selective copper(Ⅱ)ion probe to detect Cu^(2+)ion with high sensitivity and selectivity.The fluorescence of the CIS/ZnS/GdS QDs decreases upon the addition of Cu^(2+)with various concentrations,but the fluorescence intensity of QDs remains unchanged when add other metal ions such as Al^(3+),Sn^(2+),Zn^(2+),Fe^(2+),Mn^(2+),Ca^(2+),Na+,and Gd^(3+).The limit of Cu^(2+)detection calculated could reach as low as 0.5 ppb.The possible sensing mechanism was Cu^(2+)induced aggregation of CuInS2/ZnS/GdS QDs that lead to the significant fluorescence quench.
作者
吕小云
乔丽
谈笑玲
阿继凯
王彬
马洪涛
丁兰芳
王菊巍
LV Xiao-yun;QIAO Li;TAN Xiao-ling;A Ji-kai;WANG Bing;MA Hong-tao;DING Lan-fang;WANG Ju-wei(College of Mathematics and Physics,Qinghai University,Xining 810016,China)
出处
《青海师范大学学报（自然科学版）》
2022年第4期58-62,共5页
Journal of Qinghai Normal University(Natural Science Edition)
基金
青海大学校级科研启动项目
