Equilibration Time of Solid Contact Ion-Selective Electrodes
Equilibration Time of Solid Contact Ion-Selective Electrodes
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DOI：
10.1021/acs.analchem.5b00775
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发表时间：
2015-07-07
影响因子：
7.4
通讯作者：
Lindner, Erno
中科院分区：
文献类型：
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作者：
Guzinski, Marcin;Jarvis, Jennifer M.;Lindner, Erno
发表的关于离子选择性电极（ISE）的论文通常报告了这些设备在长时间广泛调节后的性能特征。调节是指在测量样品之前在水溶液中平衡离子选择性电极。对长时间和重复调节的要求在各种应用中是一个重大负担，例如，针对体内或现场应用的一次性传感器和固体接触（SC）ISE，其被开发用于提供简单的批量生产的传感器，其具有在没有校准和广泛调节的情况下实施的潜力。在这项研究中，我们记录的潜力SC K+ Na+，和H+离子交换元件作为一个函数的时间后，他们的第一次接触的电解质水溶液，并使用这些瞬态来确定其平衡时间。SC电极构建在Au、Pt和玻璃碳（GC）基底上，使用恒电流沉积的导电聚合物（PEDOT（PSS-），聚（3，4-亚乙基二氧噻吩）聚苯乙烯磺酸盐）作为离子选择性膜和基底之间的离子-电子转换器（固体内部接触）。建立在GC和Au上的SC电极具有比建立在Pt基底上的SC电极（>60分钟）显著更短的平衡时间（在5和13分钟之间）。这种显着的差异，建立在不同的基板电极上的SC ISE的平衡时间在这里首次报道。这些意想不到的发现表明，导电聚合物和电子传导衬底（EC）之间的界面对SC ISE的长期动态行为有显着的影响。
Papers published on ion-selective electrodes (ISEs) generally report on the performance characteristics of these devices after long, extensive conditioning. Conditioning refers to the equilibration of the ion-selective electrode in an aqueous solution before the measurement of the sample. The requirement for long and repeated conditioning is a significant burden in a variety of applications, for example, single-use sensors aimed for in vivo or field applications and solid contact (SC) ISEs, which were developed to provide simple, mass-produced sensors that have the potential to be implemented without calibration and extensive conditioning. In this study we recorded the potential of SC K+ Na+, and H+ ISEs as a function of time following their first contact with an aqueous electrolyte solution and used these transients to determine their equilibration times. The SC electrodes were built on Au, Pt, and glassy carbon (GC) substrates using galvanostatically deposited conductive polymer (PEDOT(PSS-), poly(3,4-ethylenedioxythiophene) polystyrenesulfonate) as ion-to-electron transducer (solid internal contact) between the ion-selective membrane and the substrate. The SC electrodes built on GC and Au had significantly shorter equilibration times (between 5 and 13 min) than the SC electrodes built on Pt substrates (>60 min). Such significant differences in the equilibration times of SC ISEs built on different substrate electrodes are reported here for the first time. These unexpected findings suggest that the interface between the conductive polymer and the electron-conducting substrate (EC) has significant influence on the long-term dynamic behavior of SC ISEs.