单个Nafion@Ru和Au-Nafion@Ru纳米粒子的电化学和电化学发光碰撞行为研究

Electrochemical and electrochemiluminescent behaviors of a single Nafion@Ru or Au-Nafion@Ru nanoparticle colliding onto an ultramicroelectrode

通过静电作用在Nafion和Au-Nafion纳米粒子(NPs)上负载钌联吡啶(Ru(bpy)_(3)^(2+))分别制得Nafion@Ru和Au-Nafion@Ru NPs.分析并比较了Au-Nafion@Ru和Nafion@Ru NPs在金超微电极(Au UME)上随机碰撞产生电流响应峰的平均峰大小、峰电量和单峰持续时间,建立了以Au-Nafion@Ru NPs为主体的电化学碰撞体系.研究结果表明,制备的Au-Nafion@Ru NPs因其特殊结构,Nafion和AuNPs的共同参与增加了NPs与Au UME的有效接触或碰撞面积,产生了更强的电化学碰撞响应信号.在Au-Nafion@Ru NPs-三正丙胺(TPrA)体系中,同时使用电流-时间曲线和电化学发光(ECL)-时间曲线监测Au-Nafion@Ru NPs碰撞Au UME产生的电化学和ECL瞬变信号,建立了单个Au-Nafion@Ru NPs-TPrA在Au UME上瞬变电化学信号与ECL信号之间的相关性.该策略为研究其他分子电化学碰撞体系提供了思路.

Nafion and Au-Nafion nanoparticles(NPs)are electrostatically loaded with ruthenium(II)tris(2,2’-bipyridyl)(Ru(bpy)_(3)^(2+))luminescent molecules to prepare Nafion@Ru and Au-Nafion@Ru NPs.The average spike current,peak charge and duration per spike of the response peaks generated by random collisions of Au-Nafion@Ru NPs and Nafion@Ru NPs on gold ultramicroelectrodes(Au UME)were analyzed and compared,and an electrochemical collision system with Au-Nafion@Ru NPs as the main body was established.The results show that the prepared Au-Nafion@Ru NPs possess the special structure of Au-Nafion@Ru,which can increase the effective contact or collision sites between NPs and Au UME with the co-participation of Nafion and AuNPs,resulting in an enhanced electrochemical collision response signal.In the system of Au-Nafion@Ru NPs-tri-n-propylamine(TPrA),the timecurrent curve and electrochemiluminescence(ECL)-time method were used to monitor the electrical and ECL transient signals generated by Nafion@Ru or Au-Nafion@Ru NPs colliding with Au UME,and a good relationship between electrochemical and ECL transient signals generated by the collisions of single Au-Nafion@Ru NPs-TPrA on Au UME was established.This strategy provides a new insight for studying the electrochemical collision systems of other molecules.