The two most promising approaches for preparing solid contacts (SCs) for polymeric membrane based ion‐selective electrodes (ISEs) are based on the use of large surface areas conducting materials with high capacitance (e. g., various carbon nanotubes) and redox active materials (e. g. conducting polymers). While many of the essential requirements for the potential stability of SCISEs were addressed, the E⁰ reproducibility and its predictability, that would enable single use of such electrodes without calibration is still a challenge, i. e., the fabrication of electrodes with sufficiently close E⁰ and slope values to enable the characterization of large fabrication batches through the calibration of only a small number of electrodes. The most generic solution seems to be the adjustment of the E⁰ potential by polarization prior to the application of the ion‐selective membrane. This approach proved to be successful in case of conducting polymer‐based solid contacts, but has to be still explored for capacitive solid contact based ISEs, which is the purpose of this paper. We have chosen a well‐established highly lipophilic multi‐walled carbon nanotube (MWCNT), i. e. octadecane modified MWCNT (OD‐MWCNT), that is investigated in the comparative context of a similarly lipophilic conducting polymer solid contact (a perfluorinated alkanoate side chain functionalized poly(3,4‐ethylenedioxythiophene)). While, the OD‐MWCNT based SCISEs had inherently small standard deviation of their E⁰ values (less than 5 mV) this could be further improved by external polarization and short circuiting the SCISEs.

中文翻译：

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具有可重现标准电位的亲脂性多壁碳纳米管固体接触钾离子选择电极。比较研究

制备基于聚合物膜的离子选择电极（ISE）的固态触点（SC）的两种最有希望的方法是基于使用大表面积导电材料（例如各种碳纳米管）和高氧化还原活性材料（例如，高电容）导电聚合物）。虽然解决了SCISEs潜在稳定性的许多基本要求，但E ^0的可重复性及其可预测性仍然是一个挑战，即能够一次性使用此类电极而无需校准。例如，制造具有足够接近的E ⁰的电极斜率值和斜率值仅通过少量电极的校准就可以表征大批量生产。最通用的解决方案似乎是调整E ⁰在应用离子选择膜之前通过极化产生电位。这种方法在传导基于聚合物的固体接触的情况下被证明是成功的，但是对于基于电容性固体接触的ISE仍必须进行探索，这就是本文的目的。我们选择了成熟的高度亲脂性多壁碳纳米管（MWCNT），即。e。十八碳烷修饰的MWCNT（OD-MWCNT），在类似的亲脂性导电聚合物固体接触（全氟链烷酸酯侧链官能化聚（3,4-亚乙基二氧噻吩））的比较上下文中进行了研究。同时，基于OD-MWCNT的SCISE本质上具有很小的E ⁰值标准偏差（小于5 mV），这可以通过外部极化和SCISE短路来进一步改善。