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Solid-Contact pH Sensor without CO2 Interference with a Superhydrophobic PEDOT-C14 as Solid Contact: The Ultimate
Marcin Guzinski1, Jennifer M Jarvis1, Paul D'Orazio2
1Department of Biomedical Engineering, The University of Memphis , Memphis, Tennessee 38152, United States.
Analytical Chemistry
|July 11, 2017
Summary
A new superhydrophobic conducting polymer, PEDOT-C14, offers superior solid contact (SC) for ion-selective electrodes (ISEs). This material enhances sensor performance and eliminates CO2 interference in pH sensing, crucial for whole-blood analysis.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Ion-selective electrodes (ISEs) are crucial for chemical analysis.
- Conventional solid contacts (SCs) in ISEs can suffer from performance limitations.
- Developing a universally applicable SC is a key challenge in ISE technology.
Purpose of the Study:
- To introduce and evaluate a novel conducting polymer-based solid contact (SC) using PEDOT-C14 for ion-selective electrodes (ISEs).
- To compare the performance of PEDOT-C14 SCs with existing PEDOT-based SCs.
- To assess the suitability of PEDOT-C14 for applications requiring high sensor stability and accuracy, such as whole-blood pH analysis.
Main Methods:
- Synthesis and characterization of PEDOT-C14, a hydrophobic derivative of poly(3,4-ethylenedioxythiophene).
- Fabrication of ISEs utilizing PEDOT-C14 as the SC with various ion-selective membranes (ISMs).
- Performance evaluation of PEDOT-C14 based ISEs, including response slope, equilibration time, potential stability, and CO2 interference testing.
Main Results:
- PEDOT-C14 based SC ISEs demonstrated outstanding performance, including theoretical response slopes and excellent potential stability.
- The superhydrophobic nature of PEDOT-C14 (water contact angle: 136 ± 5°) prevented ISM detachment and aqueous film formation.
- Crucially, PEDOT-C14 based SC pH sensors exhibited no CO2 interference, a significant advantage for whole-blood analysis.
Conclusions:
- PEDOT-C14 represents a highly effective and versatile solid contact material for ion-selective electrodes.
- Its superhydrophobic properties ensure robust sensor construction and reliable performance by preventing interfacial water layer formation.
- The elimination of CO2 interference makes PEDOT-C14 particularly promising for advanced pH sensing applications in biological samples.
