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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
07:32

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Published on: January 17, 2018

An all-solid-state reference electrode based on the layer-by-layer polymer coating.

Nak-Hyun Kwon1, Kyung-Sun Lee, Mi-Sook Won

  • 1Department of Chemistry and Center for Innovative BioPhysio Sensor Technology, Pusan National University, Busan 609-735, S. Korea.

The Analyst
|August 22, 2007
PubMed
Summary

A novel solid-state reference electrode (SSRE) was developed using a multi-layer polymer coating for enhanced stability and minimal potential drift. This advanced electrode demonstrates reliable performance in various conditions and applications, including blood pH and pCO2 determination.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Polymer Science

Background:

  • Traditional reference electrodes face challenges with stability and potential drift.
  • Developing robust solid-state reference electrodes is crucial for accurate electrochemical measurements.

Purpose of the Study:

  • To fabricate a stable solid-state reference electrode (SSRE) with enhanced performance.
  • To minimize potential drift in response to pH variations.
  • To evaluate the electrode's performance in complex biological samples.

Main Methods:

  • Fabrication of a multi-layer electrode using silicone rubber, perfluorinated ionomer, and a polyurethane-based membrane.
  • Incorporation of KCl, SiCl4, and a H+-ion-selective ionophore (tridodecylamine; TDDA).
  • Morphological analysis using SEM, cyclic voltammetry, and potentiometry.

Main Results:

  • The layer-by-layer polymer coating significantly improved electrode stability.
  • Introduction of TDDA minimized potential drift across different pH levels.
  • The SSRE showed minimal potential variation with high salt concentrations and validated performance in blood pH/pCO2 determination.
  • The electrode demonstrated remarkable stability over a two-year period.

Conclusions:

  • The developed SSRE offers superior stability and accuracy compared to conventional electrodes.
  • The fabrication method and material selection are effective for creating high-performance reference electrodes.
  • The SSRE is a practical and reliable tool for various electrochemical sensing applications, particularly in biomedical fields.