Semiconductor Neural Interfaces with Ultrahigh Capacitance via Ohmic-Contacted V₂O₅ Nanowires.

Area of Science:

• Materials Science
• Neuroscience
• Biomedical Engineering

Background:

• Neural electrodes are crucial for brain-computer interfaces but suffer from noise, instability, and infection.
• Existing electrodes limit precise neural recording and intervention due to performance limitations.

Purpose of the Study:

• To develop a high-performance, multifunctional neural interface using vanadium pentoxide (V2O5) nanowires.
• To address challenges of impedance, stability, and biocompatibility in neural electrode technology.

Main Methods:

• Fabrication of a V2O5 nanowire-based neural electrode with a 3D porous nanostructure.
• Characterization of electrode properties including impedance, capacitance, stability, and antibacterial activity.
• In vivo evaluation of neural signal acquisition compared to commercial electrodes.

Main Results:

• Achieved a 45.9% decrease in impedance and a 14.2-fold increase in charge storage capacity.
• Demonstrated exceptional stability under mechanical stress and prolonged storage.
• Exhibited significant antibacterial activity against E. coli (332.6 μm inhibition zone).

Conclusions:

• The V2O5 nanowire electrode offers ultrahigh capacitance, enhanced stability, and effective antibacterial properties.
• This novel neural interface facilitates high-fidelity neural signal acquisition and reduces infection risk.
• Presents a promising strategy for developing advanced neural interfaces with clinical potential.