Detection of Transient Nanoparticle Collision Events Using Electrochemiluminescence on a Closed Bipolar Microelectrode
Detection of Transient Nanoparticle Collision Events Using Electrochemiluminescence on a Closed Bipolar Microelectrode
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DOI：
10.1002/celc.201901734
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发表时间：
2020-01-02
期刊：
影响因子：
4
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Defnet, Peter A.;Zhang, Bo
光学成像和双极电化学阵列的使用是光学监测以及空间和时间分辨异质电子转移过程的有力方法。然而，以前的研究主要局限于缓慢或稳态氧化还原过程的研究。在这项工作中，我们使用电化学发光（ECL），以证明光学记录的能力，在碳超微电极（UME）上的单个铂纳米粒子的瞬态碰撞事件。双极电极的阴极上的Pt纳米颗粒的电催化信号耦合到阳极上的ECL信号，产生瞬态光信号。相关的电流（i-t）和ECL（计数-t）的痕迹，然后进行比较，以确定影响这些快速事件的准确的时间分辨率的关键参数。我们的研究结果表明，ECL可以是一种有效的手段，用于空间和时间上解决瞬态氧化还原过程时，用于封闭的双极电极阵列。
The use of optical imaging and bipolar electrochemical arrays is a powerful approach for optically monitoring as well as spatially and temporally resolving heterogeneous electron-transfer processes. Previous studies, however, have been largely limited to the study of slower or steady-state redox processes. In this work, we use electrochemiluminescence (ECL) to demonstrate the ability to optically record transient collision events of single platinum nanoparticles on a carbon ultramicroelectrode (UME). The electrocatalytic signal of a Pt nanoparticle on a cathodic pole of a bipolar electrode is coupled to the ECL signal on the anodic pole generating a transient optical signal. Correlated amperometric (i-t) and ECL (count-t) traces are then compared to determine critical parameters which influence the accurate temporal resolution of these rapid events. Our results suggest that ECL can be an effective means for spatially and temporally resolving transient redox processes when used on arrays of closed bipolar electrodes.