新型量子点修饰金电极的制备及其在检测多巴胺中的应用  

Preparation of novel CdTe QDs modified gold electrode and application in electrochemical determination of dopamine

作　　者：寇文杰[1] 王晶晶[2] 艾永青[2] 吕鉴泉[2] 

机构地区：[1]黄石市中心血站 [2]湖北师范学院化学与环境工程学院污染物分析与资源化技术湖北省重点实验室,湖北黄石435002

出　　处：《湖北师范学院学报（自然科学版）》2011年第3期16-20,30,共6页Journal of Hubei Normal University(Natural Science)

基　　金：湖北省自然科学基金项目(2010CDA061);湖北省教育厅创新团队项目和重点项目(D200922005)资助

摘　　要：用3-巯基丙酸(MPA)包覆的碲化镉量子点(CdTe QDs)在金电极上进行自组装,制备了CdTe QDs修饰金电极(CdTe QDs/Au E)。利用循环伏安法研究此修饰电极的电化学行为,以[Fe(CN)6]3-/4-为探针,考察了CdTe QDs自组装膜修饰金电极的电化学性质。而且研究了多巴胺(DA)在此电极上的电化学行为,结果表明:DA在此修饰电极上可被电催化氧化。差分脉冲伏安(DPV)氧化峰电流与DA浓度在1.00×10-9～6.40×10-5mol/L范围内呈线性关系,检出限为3.30×10-10mol/L.3-mercaptopropionic acid（3-MPA） capped cadmium tellurium quantum dots（CdTe QDs） self-assembled monolayer modified electrode（CdTe QDs /Au E） was prepared and its electrochemical behavior was studied by cyclic voltammetry.The results showed that a self-assembled monolayer（SAM） was formed on the surface of gold electrode.[Fe（CN）6]3-/4-redox couple was used as the electrochemical probe to study the electrochemical characteristics of SAM modified gold electrode.The electrochemical behaviors of dopamine（DA） were investigated at CdTe QDs /Au E.The results showed that the electrochemical oxidation of DA could be electrocatalyzed.There were linear relationships between the anodic peak current and the concentration of DA（1.00×10-9 ～ 6.40×10-5 mol/L） in differential pulse voltammograms,the detection limit was 3.03 ×10-10 mol/L.The modified electrode shows high stability,good reproducibility and can avoid the commonly coexisted interference.

关 键 词：金电极 量子点 多巴胺 化学修饰电极 

分 类 号：O657.1[理学—分析化学]