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Highly Stretchable, Compliant, Polymeric Microelectrode Arrays for In Vivo Electrophysiological Interfacing
Dianpeng Qi1, Zhiyuan Liu1, Yan Liu1
1School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore.
Advanced Materials (Deerfield Beach, Fla.)
|September 5, 2017
Summary
Researchers developed novel stretchable polymeric microelectrode arrays (MEAs) using polypyrrole nanowires. These advanced MEAs offer high stretchability and adhesion for biointegrated electronics, enabling neural recording and stimulation.
Area of Science:
- Bioelectronics
- Materials Science
- Neuroscience
Background:
- Polymeric microelectrode arrays (MEAs) are crucial for biointegrated electronics, but achieving both high stretchability and robust electrode-substrate adhesion remains a challenge.
- Increased stretchability in MEAs often leads to electrode delamination due to mismatched mechanical properties (Young's modulus) between the electrode and substrate.
Purpose of the Study:
- To design and fabricate highly stretchable and mechanically stable polymeric MEAs with improved electrode-substrate adhesion.
- To overcome the limitations of current stretchable MEAs by developing novel electrode materials and integration strategies.
Main Methods:
- Development of polypyrrole (PPy) electrode materials integrated with PPy nanowires on conductive PPy electrode arrays.
- Fabrication of stretchable polymeric MEAs utilizing the designed PPy electrode material.
- Characterization of MEA properties including stretchability, electrode-substrate adhesion, Young's modulus, recycling stability, and conductivity.
Main Results:
- Fabrication of stretchable polymeric MEAs with approximately 100% stretchability and 1.9 MPa electrode-substrate adhesion.
- Achieved low Young's modulus (450 kPa), excellent recycling stability (10,000 stretch cycles), and high conductivity.
- Demonstrated conformal electrocorticograph recording in rats during normal and epileptic states.
- Successfully performed electrical stimulation of the rat ischiadic nerve.
Conclusions:
- The developed PPy-based stretchable polymeric MEAs offer a promising solution for compliant neural electrodes, balancing high stretchability with mechanical stability.
- This strategy provides a new perspective for creating advanced biointegrated microelectrodes vital for neural interfaces.
- The successful in vivo applications highlight the potential of these MEAs for both neural recording and stimulation in biomedical research.
