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Published on: February 12, 2020
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Sputtered Ruthenium Oxide Neural Stimulation Electrodes.
Summary
Sputtered ruthenium oxide (RuOx) coatings demonstrate significant charge injection capacity and electrochemical stability. These findings highlight RuOx as a promising material for neural stimulation applications.
Area of Science:
- Materials Science
- Electrochemistry
- Biomedical Engineering
Background:
- Ruthenium oxide (RuOx) is explored for electrochemical applications.
- Effective charge injection is crucial for neural stimulation devices.
- Microelectrode arrays require robust and stable coating materials.
Purpose of the Study:
- To investigate the charge-injection properties of sputtered RuOx coatings.
- To evaluate the electrochemical stability of RuOx under stimulation conditions.
- To assess the suitability of RuOx for neural interfaces.
Main Methods:
- Sputtering deposition of RuOx coatings on microelectrode arrays.
- Electrochemical characterization of charge-injection capacity within specific potential limits (-0.6/0.6 V and -0.7/0.7 V vs Ag|AgCl).
- Cyclic voltammetry and long-term stability testing (1-billion cycles) in phosphate-buffered saline (PBS) and artificial interstitial fluid (aISF) at 37°C.
Main Results:
- Substantial charge injection was observed within -0.6/0.6 V vs Ag|AgCl potential limits.
- Charge-injection capacity increased upon extending potential limits to -0.7/0.7 V vs Ag|AgCl.
- No oxygen reduction side reactions occurred during pulsing in PBS.
- RuOx coatings exhibited excellent electrochemical stability up to 1-billion cycles at 8 nC/phase.
Conclusions:
- Sputtered RuOx coatings offer significant charge injection capabilities.
- RuOx demonstrates high electrochemical stability, suitable for chronic neural stimulation.
- The material is robust against side reactions, enhancing its potential for biomedical applications.
