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Metal-metal oxide pH sensors for physiological application
Danny O'Hare1, Kim H Parker, C Peter Winlove
1Department of Bioengineering, Imperial College, Chemical Engineering Building, Prince Consort Road, London SW7 2BY, United Kingdom.
Medical Engineering & Physics
|June 24, 2006
Summary
Iridium oxide electrodes offer robust, miniaturized pH sensing. Nafion membranes stabilize performance against chloride and protein interference, enabling applications in cultured intervertebral discs.
Area of Science:
- Electrochemistry
- Materials Science
- Biomedical Engineering
Background:
- Metal-metal oxide electrodes are crucial for developing robust and miniaturized pH sensors.
- Iridium oxide (IrO2) is a promising material for pH sensing applications due to its electrochemical properties.
Purpose of the Study:
- To describe and compare iridium oxide electrodes prepared by thermal oxidation and anodization.
- To investigate the impact of chloride and protein adsorption on sensor performance.
- To identify the mechanism of sensor stabilization by Nafion membranes.
Main Methods:
- Preparation of iridium oxide electrodes via thermal oxidation and anodization.
- Cyclic voltammetry was used to assess sensor performance and the effects of adsorption.
- Nafion membrane application and characterization of its stabilizing effect.
Main Results:
- Both thermal oxidation and anodization produced functional iridium oxide pH sensors.
- Chloride and protein adsorption negatively affected sensor performance.
- Nafion membranes significantly stabilized the sensor response against interfering species.
Conclusions:
- Iridium oxide electrodes are suitable for miniaturized and robust pH sensing.
- Nafion coating is effective in mitigating interference from chloride and proteins.
- These stabilized sensors have potential applications in biological environments, such as cultured intervertebral discs.