Penetrating glassy carbon neural electrode arrays for brain-machine interfaces.

Penetrating glassy carbon neural electrode arrays for brain-machine interfaces. Biomed Microdevices. 2020 Jun 06;22(3):43 Authors: Chen B, Zhang B, Chen C, Hu J, Qi J, He T, Tian P, Zhang X, Ni G, Cheng MM Abstract This paper presents a fabrication method for glassy carbon neural electrode arrays that combines 3D printing and chemical pyrolysis technology. The carbon electrodes have excellent biological compatibility and can be used in neural signal recording. A pretreated Si wafer is used as the substrate for 3D printing, and then, stereolithography 3D printing technology is employed to print photosensitive resin into a cone shape. Next, chemical pyrolysis is applied to convert the 3D prints into glassy carbon electrodes and modify the electrochemical performance of the carbon electrodes. Finally, the glassy carbon electrodes are packed with conductive wires and PDMS. The proposed fabrication method simplifies the manufacturing process of carbon materials, and electrodes can be fabricated without the need of deep reactive ion etching (DRIE). The height of the carbon electrodes is 1.5 mm, and the exposure area of the tips is 0.78 mm2, which is convenient for the implantation procedure. The specific capacitance of the glassy carbon arrays is higher than that of a platinum electrode (9.18 mF/cm2 vs 3.32 mF/cm2, respectively), and the impedance at 1 kHz is lower (7.1 kΩ vs 8.8 kΩ). The carbon electrodes were tested in vivo, and the...
Source: Biomedical Microdevices - Category: Biomedical Engineering Authors: Tags: Biomed Microdevices Source Type: research