Highly hydrophobic TEMPO-functionalized conducting copolymers for solid-contact ion-selective electrodes

Area of Science:

• Electrochemistry
• Materials Science
• Sensor Technology

Background:

• Solid-contact ion-selective electrodes (SCISEs) are ideal for miniaturized, wearable, and disposable biosensors.
• Reproducible calibration parameters, particularly the E⁰ value, are critical for commercializing cost-effective, single-use SCISEs.
• Current solid-contact materials face challenges in achieving optimal potential stability and reproducible E⁰ adjustment.

Purpose of the Study:

• To introduce the galvanostatic intermittent titration technique (GITT) for determining the optimal pre-adjustment potential for SCISEs.
• To demonstrate the proof of concept for GITT on a novel solid-contact material.
• To address the critical shortcoming of reproducible calibration parameters in SCISE manufacturing.

Main Methods:

• Application of the galvanostatic intermittent titration technique (GITT) for potential adjustment.
• Development and characterization of a novel solid-contact material based on copolymerization.
• Utilizing materials like EDOTF and EDOT-TEMPO for enhanced electrode performance.

Main Results:

• GITT was successfully applied to determine the best pre-adjustment potential for SCISEs.
• A novel solid-contact material, a copolymer of EDOTF and EDOT-TEMPO, was synthesized and tested.
• The developed material exhibits multiple functionalities, including hydrophobicity and efficient transduction.

Conclusions:

• GITT offers a viable method for optimizing the pre-adjustment potential in SCISEs.
• The novel EDOTF-EDOT-TEMPO copolymer demonstrates promise as a high-performance solid-contact material.
• This research contributes to the advancement of reproducible and stable SCISEs for wearable applications.