Electrochemiluminescence (ECL)-Based Electrochemical Imaging Using a Massive Array of Bipolar Ultramicroelectrodes.,Analytical Chemistry

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Electrochemiluminescence (ECL)-Based Electrochemical Imaging Using a Massive Array of Bipolar Ultramicroelectrodes.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-04-02 , DOI: 10.1021/acs.analchem.0c00921
Todd J Anderson ₁ , Peter A Defnet ₁ , Bo Zhang ₁

Affiliation

In this report, we describe the fabrication, characterization, and use of a massive array of closed bipolar ultramicroelectrodes (UMEs) in electrochemical imaging applications. The bipolar UME array is 1 cm2 in size and contains >146 000 carbon electrodes embedded in a 15 μm thick insulating and freestanding membrane of Parylene C. Structural characterization with optical and electron microscopies shows that the carbon UMEs are highly uniform in size, shape, and interelectrode spacing. The bipolar UME array was used in electrochemical imaging to probe highly dynamic redox processes in which the reduction of redox molecules on one side the array is electrically coupled to an oxidative electrochemilumescence (ECL) process on the opposite side. This allows one to simultaneously monitor electrochemical reactions on hundreds of thousands of individual electrodes with millisecond temporal resolution. Our results suggest that microfabricated closed bipolar UME arrays can be useful for imaging fast and transient electrochemical processes in which scanning probe methods are inapplicable due to their limited temporal resolution.

中文翻译：

使用大量双极超微电极阵列的基于电化学发光（ECL）的电化学成像。

在本报告中，我们描述了在电化学成像应用中大量闭合双极超微电极（UME）的制造，表征和使用。双极UME阵列的尺寸为1 cm2，包含> 146 000个碳电极，埋置在15μm厚的绝缘和独立式Parylene C膜中。通过光学和电子显微镜的结构表征表明，碳UME的尺寸，形状，和电极间距。双极UME阵列在电化学成像中用于探测高动态氧化还原过程，其中该阵列一侧的氧化还原分子的还原与另一侧的氧化电化学发光（ECL）过程电耦合。这允许以毫秒的时间分辨率同时监视数十万个单独电极上的电化学反应。我们的结果表明，微制造的封闭式双极UME阵列可用于成像快速和瞬态的电化学过程，在这些过程中，由于有限的时间分辨率，扫描探针方法不适用。

更新日期：2020-04-02

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