Abstract
A novel micro-electrocorticography (μ-ECoG) device was designed and its fabrication process was developed to demonstrate the possibility of electrical stimulation and observe visualized signals of activated neurons. We designed a donut-type μ-ECoG electrode with a hole at the center of a micro-sized disk-type electrode. Further, we introduced a Pt electroplated nanostructure formation for 3 and 8 min on a gold electrode surface. We evaluated the electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) that depend on the dimensions and Pt electroplating time of the fabricated μ-ECoG devices. The results confirmed that the electrochemical properties of the Pt electroplated donut-type electrode are similar to those of the conventionally used disk-type electrodes through the required electroplating time. Through the equivalent circuit model, EIS, and CV analysis, the donut-type μ-ECoG proved to have good electrochemical characteristics between the electrolyte and electrode surface. The proposed μ-ECoG device is suitable for stimulation electrodes without cytotoxic materials and it simultaneously acquires optical information through the window.
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