Electrochemical interface characterization of MEMS based brain implantable all-diamond microelectrodes probe

All-diamond micro-machined neural probe is a new generation of neural probes completely fabricated by the poly-carbon process. It has excellent properties required for neural prosthetic applications such as wider potential window, low background current, very high and low electrical resistivities for undoped and doped poly-carbon respectively, mechanical flexibility and biocompatibility. The interface characterization, equivalent model and electrochemical analysis of this probe is presented in this paper. The double layer capacitance is function of microelectrode size and is found to be approximately 3.78 μF/cm². It exhibits a completely reversible electrochemical nature resulting in a stable behavior in aqueous chemical environment.