银纳米线的制备及其对电化学发光催化研究

采用水热法,在反应体系中加入微量的CuCl2作为去氧剂,以AgNO3为前驱物,聚乙烯吡咯烷酮(PVP)为稳定剂和结构导向剂,乙二醇为还原剂和溶剂制备银纳米线.研究了反应温度、反应时间及CuCl2浓度对产物微观形貌的影响.通过X-射线衍射(XRD)、扫描电子显微镜(SEM)等检测手段表征了其结构和性能.同时,将所制得的银纳米线作为联吡啶钌Ru(bpy)2+3]电化学发光(ECL)的工作电极对其催化机理进行研究.结果表明:在反应温度为165℃、反应时间为1h、CuCl2浓度为4 mmol/L时制备出了具有面心立方结构的,长度为13 μm,长径比约为75的银纳米线；与普通银丝电极相比,由于具有较高的比表面积和较独特的催化特性,银纳米线电极更适合作为Ru(bpy)2+3 ECL的工作电极.

The Synthesis of Silver Nanowires and Studies on Its Catalytic Mechanism of ECL

Silver nanowires were successfully synthesized by hydrothermal method using a small amount copper chloride as removing oxygen agent,ethylene glycol as reducing agent,in which poly(vinylpyrrolidone,PVP) was used as stabilizer and structure-directing agent,silver nitrate was used as predecessor.The effects of reaction temperature,reaction time and concentration of copper chloride on the sample morphology were investigeted.The structure and performance of the as-prepared silver nanowires were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).Meanwhile,the as-prepared silver nanowires were used as work electrode to the electrochemical luminescence(ECL) of Ru(bpy)2+ 3for research its catalytic mechanism.The results show that the as-prepared silver nanowires had face-centered cubic structure,with length up to 13 μm and the ratio of length-diameter was 75 under the temperature of 165 ℃、the reaction time of 1 h and the concentration of CuCl2 of 4 mmol/L.Compared with Ag bulk electrode,the silver nanowires electrode was more suitable for the work electrode of ECL of Ru(bpy)2+ 3 because of the high specific surface area and unique catalytic properties.