Ion-selective Electrodes with 3D Nanostructured Conducting Polymer Solid Contact

Szűcs, Júlia and Lindorfs, Tom and Bobacka, Johan and Gyurcsányi, Ervin Róbert (2015) Ion-selective Electrodes with 3D Nanostructured Conducting Polymer Solid Contact. Electroanalysis, 27. pp. 1-10. ISSN 1040-0397, ESSN: 1521-4109

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Abstract

Until now both ion-to-electron transducers as well as large surface area nanostructured conducting materials were successfully used as solid contacts for polymer-based ion- selective electrodes. We were interested to explore the combination of these two approaches by fabricating ordered electrically conducting polymer (ECP) nanostructures using 3D nanosphere lithography and electrosynthesis to provide a high surface area and capacitive interface for solid contact ion- selective electrodes (SC-ISEs). For these studies we used poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT(PSS)) films with 750 nm diameter interconnected pores as the intermediate layer between a glassy carbon electrode and a Ag+ -selective polymeric membrane. We also investigated the feasibility of loading the voids created in the polymer film with a lipophilic redox mediator (1,1’-dimethylferrocene) to provide the respective ISEs with well-defined/controllable E0 values. These expectations were fulfilled as the standard deviation of E0 values were reduced with almost an order of magnitude for 3D nanostructured SC-ISEs filled with the redox mediator as compared to their redox mediator-free analogs. The detrimental effect of the redox mediator extraction into the plasticized PVC-based ion-selective membrane (ISM) was efficiently suppressed by replacing the PVC-based ISMs with a low diffusivity silicone rubber matrix.

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