当前位置:
X-MOL 学术
›
Anal. Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Electrochemiluminescence Based on a Dual Carbon Ultramicroelectrode with Confined Steady-State Annihilation
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-03-03 , DOI: 10.1021/acs.analchem.0c04954
Minghan Wang 1 , Junjie Liu 1 , Xu Liang 1 , Rongyao Gao 2 , Yiming Zhou 2 , Xin Nie 1 , Yi Shao 1 , Yan Guan 1 , Limin Fu 2 , Jianping Zhang 2 , Yuanhua Shao 1
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-03-03 , DOI: 10.1021/acs.analchem.0c04954
Minghan Wang 1 , Junjie Liu 1 , Xu Liang 1 , Rongyao Gao 2 , Yiming Zhou 2 , Xin Nie 1 , Yi Shao 1 , Yan Guan 1 , Limin Fu 2 , Jianping Zhang 2 , Yuanhua Shao 1
Affiliation
![]() |
Developing novel microelectronic devices for electrochemical measurements and electrochemiluminescence (ECL) study is of great importance. Herein, we fabricated a submicrometer-sized dual carbon electrode (DCE) and investigated its annihilation ECL behavior under steady-state conditions for the first time. The oxidation and reduction of the model luminophore, [Ru(bpy)3]2+, occurred separately at the two sides of the DCE, and the electrogenerated ions then diffused to the gap between the two electrodes to generate the excited-state intermediate [Ru(bpy)3]2+* and ECL emission. Compared with other types of two-electrode systems, the prepared DCE possesses a smaller total size and an ultrasmall interelectrode distance of 60 nm or less, which could result in a shorter diffusion time and an amplified ECL signal without the purification of the solvent and supporting electrolytes. On the basis of the constructed ECL microscopic platform, we successfully obtained a stable and confined ECL signal in the vicinity of the electrode tip. Furthermore, a two-dimensional finite element method simulation of this model system was performed to quantitively analyze the concentration profiles of the electrogenerated species around the tip of the DCE and predict the concentrations of [Ru(bpy)3]2+* with various gap distances. The simulation results also proved that the higher concentrations of [Ru(bpy)3]2+* could be achieved with a smaller distance with a possible amplification factor of 6 (compared with the concentration when the gap distance is greater than 300 nm). This work provides an experimental model for further improvement of ECL efficiency and broadens the availability for annihilation ECL applications in small confined spaces.
中文翻译:
基于双碳超微电极的稳态稳态An灭的电化学发光
开发用于电化学测量和电化学发光(ECL)研究的新型微电子器件非常重要。在本文中,我们首次制造了亚微米尺寸的双碳电极(DCE),并首次研究了其在稳态条件下的an灭ECL行为。模型发光体[Ru(bpy)3 ] 2+的氧化和还原分别发生在DCE的两侧,然后电生成的离子扩散到两个电极之间的间隙中,从而生成激发态中间体[ Ru(bpy)3 ] 2 + *和ECL排放。与其他类型的双电极系统相比,制备的DCE具有较小的总尺寸和60nm以下的极小电极间距离,这可能导致较短的扩散时间和放大的ECL信号,而无需纯化溶剂和支持物。电解质。在构造的ECL微观平台的基础上,我们成功地在电极尖端附近获得了稳定且受限的ECL信号。此外,对该模型系统进行了二维有限元方法模拟,以定量分析DCE尖端周围的电生物质的浓度分布,并预测[Ru(bpy)3 ] 2 + *的浓度。具有各种间隙距离。模拟结果还证明,[Ru(bpy)3 ] 2 + *的浓度越高,距离越短,可能的放大倍数为6(与间隙距离大于300 nm时的浓度相比)。这项工作为进一步提高ECL效率提供了实验模型,并扩大了在狭窄密闭空间中进行E灭ECL应用的可用性。
更新日期:2021-03-16
中文翻译:

基于双碳超微电极的稳态稳态An灭的电化学发光
开发用于电化学测量和电化学发光(ECL)研究的新型微电子器件非常重要。在本文中,我们首次制造了亚微米尺寸的双碳电极(DCE),并首次研究了其在稳态条件下的an灭ECL行为。模型发光体[Ru(bpy)3 ] 2+的氧化和还原分别发生在DCE的两侧,然后电生成的离子扩散到两个电极之间的间隙中,从而生成激发态中间体[ Ru(bpy)3 ] 2 + *和ECL排放。与其他类型的双电极系统相比,制备的DCE具有较小的总尺寸和60nm以下的极小电极间距离,这可能导致较短的扩散时间和放大的ECL信号,而无需纯化溶剂和支持物。电解质。在构造的ECL微观平台的基础上,我们成功地在电极尖端附近获得了稳定且受限的ECL信号。此外,对该模型系统进行了二维有限元方法模拟,以定量分析DCE尖端周围的电生物质的浓度分布,并预测[Ru(bpy)3 ] 2 + *的浓度。具有各种间隙距离。模拟结果还证明,[Ru(bpy)3 ] 2 + *的浓度越高,距离越短,可能的放大倍数为6(与间隙距离大于300 nm时的浓度相比)。这项工作为进一步提高ECL效率提供了实验模型,并扩大了在狭窄密闭空间中进行E灭ECL应用的可用性。