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Non-polarisable dry electrode based on NASICON ceramic
C Gondran1, E Siebert, P Fabry
1Laboratorie d'lonique et d'Electrochimie du Solide de Grenoble, Ecole Nationale Supérieure d'Electrochimie et d'Electrométallurgie de Grenoble, Saint Martin d'Hères, France.
Medical & Biological Engineering & Computing
|May 1, 1995
Summary
A novel NASICON-type ceramic electrode enables gel-free bioelectric signal recording through skin sodium ion exchange. Its impedance decreases over time due to perspiration, offering a promising alternative for wearable biosensors.
Area of Science:
- Materials Science
- Biomedical Engineering
- Electrochemistry
Background:
- Traditional bioelectric signal recording often requires conductive gels.
- Developing gel-free electrodes is crucial for long-term wearable applications.
- NASICON-type ceramics offer high sodium ion conductivity, a property relevant for ionic interfaces.
Purpose of the Study:
- To propose and characterize a NASICON-type ceramic electrode for gel-free bioelectric signal recording.
- To investigate the electrochemical properties and skin-electrode interface of the proposed material.
- To understand the factors influencing the electrode's impedance and signal recording capability.
Main Methods:
- Fabrication of NASICON-type ceramic electrodes.
- Electrochemical impedance spectroscopy in saline solutions.
- Evaluation of skin-electrode impedance over time.
- Investigation of the effect of skin condition (NaCl solution, abrasion) on impedance.
Main Results:
- The NASICON-type ceramic electrode demonstrated gel-free bioelectric signal recording capability.
- The electrode exhibited slight polarizability in saline solutions.
- Skin-electrode impedance decreased over time, primarily due to a reduction in the resistive component.
- Perspiration and skin condition (e.g., abrasion) significantly influenced the impedance.
Conclusions:
- NASICON-type ceramic electrodes are a viable option for gel-free bioelectric signal recording.
- The electrode's performance is influenced by ionic exchange with the skin and physiological factors like perspiration.
- Further research into optimizing the electrode-skin interface could enhance signal quality for wearable biosensors.