CdTe:Mn/ZnS量子点的合成及其磷光法检测水体中超痕量汞离子的研究  

Study on Synthesis of Mn-Doped CdTe/ZnS Quantum Dots and Phosphorescence Quenching Method for the Detection of Ultra Trace Mercury Ions in Water

作　　者：吕诗言[1] 叶泰[1] 姜欣[1] 王晶晶[1] 魏国芬[1] 吕鉴泉[1] 

机构地区：[1]湖北师范学院污染物分析与资源化技术湖北省重点实验室,黄石435002

出　　处：《化学学报》2011年第7期831-837,共7页Acta Chimica Sinica

基　　金：湖北省自然科学基金(No.2010CDA061);湖北省教育厅创新团队项目和重点项目(No.D200922005)资助项目

摘　　要：以3-巯基丙酸为稳定剂水相合成了新型CdTe:Mn/ZnS量子点,用原子力显微镜、紫外-可见光谱、荧光光谱等技术对其进行了表征.以CdTe:Mn/ZnS量子点为磷光探针,建立了基于汞离子对该量子点的磷光猝灭定量检测汞离子的新方法.文中考察了pH值、缓冲介质、反应时间、量子点浓度等因素的影响.在最佳实验条件下,可测定5.0×10-8～1.0×10-5 mol/L的汞离子,检出限为4.3×10-9 mol/L.方法成功地应用于实际样品中超痕量汞离子的测定.文中就其作用机理作了初步探讨.A novel Mn-doped CdTe/ZnS quantum dots was synthesized in aqueous solution with 3-mercaptopropionic acid as the stabilizer, and characterized by atomic force microscopy, ultraviolet-visible spectrometry and spectrofluorimetry, respectively. A new approach was developed for the sensitive and selective detection of mercury ions with Mn-doped CdTe/ZnS quantum dots as phosphorescence probes. Influence factors, including the concentration and pH of buffer, reaction time and quantum dots concentration, were investigated. Under the optimum conditions, the calibration graph was linear in the range from 5.0 ×10^-8 to 1.0 × 10^-5 mol/L of mercury ions concentration, with a detection limit of 4.3 ×10^-9 mol/L. The pro- posed method has been successfully used for the determination of trace mercury ions in water sample. The interaction mechanism between mercury ions and quantum dots has been orimarily discussed.

关 键 词：量子点 汞离子 磷光检测 CdTe:Mn/ZnS 

分 类 号：O661.1[理学—分析化学] X832[理学—化学]