Voltammetric Properties of All‐solid State Ion‐selective Electrodes with Multiwalled Carbon Nanotubes‐poly(3‐octylthiophene‐2,5‐diyl) Nanocomposite Transducer,Electroanalysis

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Voltammetric Properties of All‐solid State Ion‐selective Electrodes with Multiwalled Carbon Nanotubes‐poly(3‐octylthiophene‐2,5‐diyl) Nanocomposite Transducer
Electroanalysis ( IF 2.7 ) Pub Date : 2019-07-31 , DOI: 10.1002/elan.201900380
Dawid Kałuża ₁ , Agata Michalska ₁ , Krzysztof Maksymiuk ₁

Affiliation

Voltammetric response of an all‐solid‐state ion‐selective electrode was studied on example of potassium‐selective sensor with poly(vinyl chloride) based membrane and nanocomposite transducer containing poly(3‐octylthiophene‐2,5‐diyl) and multiwalled carbon nanotubes. Factors limiting the rate of the electrochemical process and the response were discussed. The challenge in voltammetric applications of ion‐selective electrodes is thickness of the plastic membrane. It was found that although a relatively thick ion‐selective membrane was applied, as typically used in potentiometric studies, the position of the reduction peak, corresponding to potassium ions incorporation, was dependent on ions concentration in a Nernstian manner. This opens possibility of deviation from the paradigm of ultrathin membranes in voltammetric applications, thus potentially extending the sensors lifetime. The high resistance of the membrane did not affect the voltammetric characteristics, because the resistance was independent of ions concentration in solution. On the other hand, high resistance results in charge trapping effect in the solid contact material, leading to advantageous retention of the oxidized‐conducting state of the solid contact, independently of the applied electrode potential.

中文翻译：

具有多壁碳纳米管-聚（3-辛基噻吩-2,5-二基）纳米复合传感器的全固态离子选择电极的伏安特性

以含氯乙烯膜和含聚（3-辛基噻吩-2,5-二基）和多壁碳纳米管的纳米复合换能器的钾选择性传感器为例，研究了全固态离子选择电极的伏安响应。讨论了限制电化学过程速率和响应的因素。离子选择电极在伏安法应用中的挑战是塑料膜的厚度。已发现，尽管使用了相对较厚的离子选择膜，如电位计研究中通常使用的，但还原峰的位置（对应于钾离子的掺入）以能斯特方式依赖于离子浓度。这为伏安应用中偏离超薄膜范式的可能性提供了可能，因此有可能延长传感器的使用寿命。膜的高电阻不会影响伏安特性，因为该电阻与溶液中的离子浓度无关。另一方面，高电阻会导致固体接触材料中的电荷俘获效应，从而导致固体接触的氧化导电状态得到有利的保持，而与所施加的电极电位无关。

更新日期：2019-11-18

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