David Probst , Inyoung Lee , Jeffrey E. Dick , Koji Sode
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引用次数: 0
摘要
在这里,我们展示了一个封闭双极电极的应用,以测量普鲁士蓝/白的开路电位(OCP)的变化作为[Cl−]浓度的函数,独立于电极表面积。在这种双极方案中,一个恒电位器在两个独立的电池上保持恒定的电压,两个电池由一个共享电极连接,该电极一端对[Cl−]敏感,另一端由普鲁士蓝电沉积。当[Cl−]加入样品室时,离子与Ag+结合产生Ag/AgCl,改变结电位。这种变化通过普鲁士蓝/普鲁士白比例的变化在电化学上得到平衡。第二个恒电位器用于监测普鲁士蓝电极上的这些变化,产生氯的定量。我们在不同的电极表面积上测量了1.0 mM - 55 mM [Cl−]的范围,表明信号响应与电极面积无关。此外,该系统具有在单个双极电极上转换信号的能力,同时在每个隔间中使用不同尺寸的电极,这一特性可能有利于微阵列或信号放大。
Surface area independent response of closed bipolar electrodes
Here, we demonstrated the application of a closed bipolar electrode to measure the change in open circuit potential (OCP) of Prussian blue/white as a function of [Cl−] concentration independently of electrode surface area. In this bipolar scheme, a potentiostat holds a constant voltage across two separate cells linked by a shared electrode that is sensitive to [Cl−] on one end and electrodeposited by Prussian blue on the other. As [Cl−] is added to the sample compartment, the ion associates with Ag+ to produce Ag/AgCl, altering the junction potential. This change is balanced electrochemically by a shift in the ratio of Prussian blue/Prussian white. A second potentiostat is used to monitor these changes over the Prussian blue electrode, yielding a for the quantification of chloride. We measured a range of 1.0 mM – 55 mM [Cl−] over various electrode surface areas, demonstrating that the signal response is independent of electrode area. Additionally, the system had the capability to translate signal across a single bipolar electrode while using differently sized electrodes in each compartment, a property that could be beneficial for microarrays or signal amplification.
期刊介绍:
Sensors and Actuators Reports is a peer-reviewed open access journal launched out from the Sensors and Actuators journal family. Sensors and Actuators Reports is dedicated to publishing new and original works in the field of all type of sensors and actuators, including bio-, chemical-, physical-, and nano- sensors and actuators, which demonstrates significant progress beyond the current state of the art. The journal regularly publishes original research papers, reviews, and short communications.
For research papers and short communications, the journal aims to publish the new and original work supported by experimental results and as such purely theoretical works are not accepted.