Lenar Nikola, Piech Robert, Paczosa-Bator Beata
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30059 Krakow, Poland.
Materials (Basel). 2021 Apr 10;14(8):1891. doi: 10.3390/ma14081891.
This work presents the first-time application of the ruthenium dioxide-poly(3,4-ethylenedioxythiophene) polystyrene sulfonate high-capacity composite material as a mediation layer in potassium selective electrodes, which turned out to significantly enhance the electrical and analytical parameters of the electrodes. The idea was to combine the properties of two different types of materials: a conducting polymer, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, and a metal oxide, ruthenium dioxide, in order to obtain the material for a solid-contact layer of great electrical and physicochemical parameters. The preparation method for composite material proposed in this work is fast and easy. The mediation layer material was examined using a scanning electron microscope and chronopotentiometry in order to confirm that all requirements for mediation layers materials were fulfilled. Ruthenium dioxide-poly(3,4-ethylenedioxythiophene) polystyrene sulfonate nancomposite material turned out to exhibit remarkably high electrical capacitance (of approximately 17.5 mF), which ensured great performance of designed K-selective sensors. Electrodes of electrical capacity equal to 7.2 mF turned out to exhibit fast and stable (with only 0.077 mV potential change per hour) potentiometric responses in the wide range of potassium ion concentrations (10 M to 10 M). The electrical capacity of ruthenium dioxide-poly(3,4-ethylenedioxythiophene) polystyrene sulfonate-contacted electrodes characterized by electrical capacitance parameters was the highest reported so far for this type of sensor.
这项工作首次将二氧化钌-聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐高容量复合材料用作钾离子选择性电极的中间层，结果表明该材料显著提高了电极的电学和分析参数。其思路是将两种不同类型材料的特性相结合：一种导电聚合物聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐和一种金属氧化物二氧化钌，以获得具有优异电学和物理化学参数的固体接触层材料。本文提出的复合材料制备方法快速且简便。使用扫描电子显微镜和计时电位法对中间层材料进行了检测，以确认满足中间层材料的所有要求。结果表明，二氧化钌-聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐纳米复合材料具有非常高的电容（约为17.5 mF），这确保了所设计的钾离子选择性传感器具有出色的性能。电容为7.2 mF的电极在宽范围的钾离子浓度（10⁻⁶ M至10⁻¹ M）下表现出快速且稳定的（每小时仅0.077 mV的电位变化）电位响应。以电容参数为特征的二氧化钌-聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐接触电极的电容是迄今为止该类型传感器报道的最高值。
