Wide bandgap semiconductor nanomembranes as a long-term biointerface for flexible, implanted neuromodulator

Area of Science:

• Biomedical Engineering
• Materials Science
• Neuroscience

Background:

• Electrical neuron stimulation is crucial for treating chronic neurological disorders.
• Existing flexible electrodes face limitations in longevity and stability for neural implantation.
• Need for durable, flexible neural interfaces for advanced stimulation therapies.

Purpose of the Study:

• To introduce a novel concept for long-lived flexible neural electrodes.
• To utilize silicon carbide (SiC) nanomembranes and thermal oxide for enhanced bioelectronic systems.
• To develop scalable fabrication methods compatible with MEMS technologies.

Main Methods:

• Fabrication of SiC nanomembranes via chemical vapor deposition (CVD).
• Growth of thermal oxide thin films as electrical barrier layers using wet oxidation.
• Integration of SiC/SiO2 system for bioelectronic applications.
• Testing stability in biofluid environments and peripheral nerve stimulation in an animal model.

Main Results:

• Demonstrated excellent long-term stability of the SiC/SiO2 bioelectronic system, potentially lasting decades.
• Maintained electronic properties in biofluid environments.
• Achieved peripheral nerve stimulation in an animal model with responses comparable to standard devices.

Conclusions:

• The developed SiC/SiO2 flexible electronics offer a scalable and durable solution for implanted bioelectrodes.
• This technology has significant potential for fundamental neuroscience research and neural stimulation therapies.
• The long-lived nature of these electrodes addresses critical challenges in current neural interface technology.