CdS/Ru(bpy)_(3)^(2+)电致化学发光传感器的构建及邻苯二酚的检测  

Fabrication of CdS/Ru(bpy)_(3)^(2+) electrochemiluminescence sensor for detection of catechol

作　　者：刘婷 杨学梅 杨敏丽 LIU Ting;YANG Xuemei;YANG Minli(College of Chemistry and Materials Science,Shanghai Normal University,Shanghai 200234,China;Shanghai Yangpu Jianshe Primary School,Shanghai 200090,China)

机构地区：[1]上海师范大学化学与材料科学学院,上海200234 [2]上海市杨浦区建设小学,上海200090

出　　处：《上海师范大学学报（自然科学版）》2021年第5期538-545,共8页Journal of Shanghai Normal University(Natural Sciences)

摘　　要：基于硫化镉量子点(CdS QDs)对三联吡啶钌(Ru(bpy)_(3)^(2+))电致化学发光(ECL)信号的增敏作用,在电极表面滴涂CdS QDs,然后引入含有多壁碳纳米管(MWCNTs)和金纳米粒子(Au NPs)的(Ru(bpy)_(3)^(2+))复合物(MWCNTs-Au NPs-Ru(bpy)_(3)^(2+)),得到了自增强CdS/Ru(bpy)_(3)^(2+)ECL传感器.该传感器同时包含了ECL物质Ru(bpy)_(3)^(2+)和共反应剂CdS QDs,具有自增强特点,MWCNTs和Au NPs的存在可进一步放大传感器的信号.邻苯二酚的电极氧化产物与Ru(bpy)_(3)^(2+)之间存在能量转移,导致ECL信号淬灭,从而实现了邻苯二酚的灵敏检测,线性响应范围为5.0×10^(-9)~1.0×10^(-5)mol·L^(-1),检出限为1.5×10^(-9)mol·L^(-1).该传感器用于河水中邻苯二酚的检测,结果令人满意.同时,传感器也表现出良好的重现性和稳定性.A self-reinforced CdS/Ru(bpy)_(3)^(2+)electrochemiluminescence(ECL)sensor was constructed based on the sensitization of cadmium sulfide quantum dots(CdS QDs)to the ECL signal of tris(2,2'-bipyridyl)ruthenium(Ⅱ)(Ru(bpy)_(3)^(2+)).CdS QDs were firstcoated dropwise on the electrode surface,and then a tris(2,2'-bipyridyl)ruthenium(Ⅱ)complex with multi-walled carbon nanotubes and gold nanoparticles(MWCNTs-Au NPs-Ru(bpy)_(3)^(2+)) was introduced.The sensor has the characteristics of self enhancement since it contains both ECL material Ru(bpy)_(3)^(2+) and coreactant CDs QDs.The presence of MWCNTs and Au NPs can further amplify the sensor signal.The energy transfer between the electrode oxidation products of catechol and Ru(bpy)_(3)^(2+) led to the quenching of the ECL signal,realizing the sensitive detection of catechol with a linear response range from 5.0×10^(-9) to 1.0×10^(-5) mol·L^(-1) and a detection limit of 1.5×10^(-9) mol·L^(-1).The sensor showed good reproducibility and stability and was used to detect catechol in river water with satisfactory result.

关 键 词：电致化学发光(ECL)传感器 三联吡啶钌(Ru(bpy)_(3)^(2+)) 硫化镉量子点(CdS QDs) 邻苯二酚 

分 类 号：O657.1[理学—分析化学]