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A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes
Published on: March 3, 2014
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PEDOT:PSS-coated platinum electrodes for neural stimulation
Gerwin Dijk, Jolien Pas1, Katarina Markovic2
1Panaxium SAS, Aix-en-Provence 13100, France.
APL Bioengineering
|December 11, 2023
Summary
Coating platinum electrodes with PEDOT:PSS enhances neural stimulation safety and longevity. This conducting polymer protects electrodes from corrosion and significantly improves neuronal cell survival during prolonged electrical stimulation.
Area of Science:
- Biomedical Engineering
- Materials Science
- Neuroscience
Background:
- Safe and long-term neural stimulation requires electrodes that can inject charge without damaging tissue or degrading.
- Conducting polymers like PEDOT:PSS offer high capacitance, making them promising for electrode modification.
- The stability and safety of PEDOT:PSS-coated electrodes for neural stimulation are not well understood.
Purpose of the Study:
- To evaluate the performance of PEDOT:PSS-coated platinum (Pt-PEDOT:PSS) microelectrodes for neural stimulation.
- To compare the stability, safety, and biocompatibility of Pt-PEDOT:PSS electrodes against bare platinum (Pt) electrodes.
- To investigate the protective effects of PEDOT:PSS coating on electrode integrity and neuronal cell survival.
Main Methods:
- Fabrication and characterization of Pt-PEDOT:PSS and bare Pt microelectrodes.
- Delivery of current-controlled, biphasic electrical stimulation pulses at varying charge densities (64–255 μC cm⁻²).
- Assessment of electrode degradation via corrosion analysis and evaluation of neuronal cell survival using primary cortical cells cultured as neurospheres.
Main Results:
- Bare Pt electrodes showed significant corrosion after 2 hours of stimulation, while Pt-PEDOT:PSS electrodes remained intact.
- Both electrode types exhibited similar charge density thresholds for acute stimulation (127 μC cm⁻²), with increased calcium response at higher densities.
- Pt-PEDOT:PSS electrodes demonstrated significantly higher neuronal cell survival rates compared to bare Pt electrodes, especially after prolonged stimulation (2 and 6 hours).
Conclusions:
- PEDOT:PSS coating effectively prevents platinum electrode corrosion during electrical stimulation.
- Pt-PEDOT:PSS microelectrodes provide a protective effect, enhancing neuronal cell survival and reducing tissue damage.
- PEDOT:PSS is a promising material for developing safer and more durable electrodes for long-term neural stimulation applications.
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