Stability Study of Synthetic Diamond Using a Thermally Controlled Biological Environment: Application towards...

Area of Science:

• Biomaterials Engineering
• Neuroscience
• Materials Science

Background:

• Neural implants require materials with long-term stability and biocompatibility for in-vivo applications.
• Assessing material degradation over extended periods is crucial for reliable neural device performance.

Purpose of the Study:

• To evaluate the long-term stability and performance of synthetic diamond as a passive layer in neural implants.
• To compare the aging characteristics of synthetic diamond against conventional polymer materials.

Main Methods:

• Developed an analytical model based on electric impedance monitoring to analyze material aging.
• Investigated parameters like metal resistivity, insulation, electrode geometry, and leakage currents over a simulated 10-year period.
• Conducted comparative dynamic impedance analysis and microscopic/optical measurements for synthetic diamond and SU8 polymer.

Main Results:

• Synthetic diamond exhibited superior stability compared to the SU8 polymer, showing minimal degradation.
• The analytical model provided insights into surface conductivity variations and material aging.
• Microscopic and optical analyses confirmed the high physical integrity of diamond over time.

Conclusions:

• Synthetic diamond demonstrates exceptional long-term viability for neural implant electrodes.
• Its high stability and biocompatibility make it a promising material for advanced, long-life neural interfaces.