Hierarchically Restructured Antibacterial Electrodes for Neural Interfaces: Electrochemical and Microstructural...

Area of Science:

• Biomaterials Engineering
• Nanotechnology
• Electrochemistry

Background:

• Platinum-iridium electrodes are crucial for neurostimulation and cardiac devices due to their electrochemical properties.
• A significant challenge is the risk of postsurgical infections, necessitating antibacterial functionality.

Purpose of the Study:

• To develop electrochemically active antibacterial platinum-iridium electrodes.
• To enhance the safety and efficacy of neural interfacing and cardiac rhythm management devices.

Main Methods:

• Hierarchical surface restructuring of platinum-iridium electrodes using femtosecond laser ablation.
• Deposition of antibacterial zinc oxide (ZnO) thin films via reactive magnetron sputtering.
• Characterization using X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy (SEM).

Main Results:

• Successful formation of ZnO thin films on restructured electrodes, confirmed by XRD and XPS.
• Increased electrochemical performance with longer ZnO deposition times, attributed to nonconformal film coverage.
• Demonstrated significant in vitro antibacterial activity against Escherichia coli and Staphylococcus aureus.
• Observed ZnO dissolution and recrystallization on the electrode surface after prolonged electrochemical cycling.

Conclusions:

• A two-step method successfully created multifunctional platinum-iridium electrodes with enhanced electrochemical and antibacterial properties.
• The developed electrodes show promise for reducing infection risks in medical implants.
• This strategy offers a pathway for next-generation neural interfacing electrodes.