Enhanced electrochemical performance of solid-state ion sensors based on silicone rubber membranes

Results of optimization studies regarding the composition of silicone rubber films suitable for preparing miniaturized solid-state ion-selective sensors are presented. Using conventional macro ion-selective electrodes (ISEs) it was shown that the addition of more lipophilic ionic additives and small amounts of an appropriate plasticizer to the silicone matrix achieved optimal electroanalytical performance. The incorporation of these components into the membrane along with the required ionophore can, however, influence membrane curing time and adhesion of the film to silicon nitride surfaces. Solid-state sensors with optimized silicone membrane compositions exhibit theoretical and reproducible electrochemical performance.

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