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Fabrication and Characterization of Micro-Nano Electrodes for Implantable BCI

National Key Laboratory of Science and Technology on Micro/Nano Fabrication Laboratory, Department of Micro/Nano-electronics, Shanghai Jiao Tong University, Shanghai 200240, China
Department of Electrical and Computer Engineering, College of Engineering, Michigan State University, East Lansing, MI 48823, USA
Authors to whom correspondence should be addressed.
Micromachines 2019, 10(4), 242;
Received: 13 March 2019 / Revised: 29 March 2019 / Accepted: 8 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Implantable Microdevices)
PDF [2740 KB, uploaded 22 April 2019]


Signal recording and stimulation with high spatial and temporal resolution are of increasing interest with the development of implantable brain-computer interfaces (BCIs). However, implantable BCI technology still faces challenges in the biocompatibility and long-term stability of devices after implantation. Due to the cone structure, needle electrodes have advantages in the biocompatibility and stability as nerve recording electrodes. This paper develops the fabrication of Ag needle micro/nano electrodes with a laser-assisted pulling method and modifies the electrode surface by electrochemical oxidation. A significant impedance reduction of the modified Ag/AgCl electrodes compared to the Ag electrodes is demonstrated by the electrochemical impedance spectrum (EIS). Furthermore, the stability of modified Ag/AgCl electrodes is confirmed by cyclic voltammogram (CV) scanning. These findings suggest that these micro/nano electrodes have a great application prospect in neural interfaces. View Full-Text
Keywords: micro/nano electrode; electrochemistry; modified electrode; implantable BCI micro/nano electrode; electrochemistry; modified electrode; implantable BCI

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Xi, Y.; Ji, B.; Guo, Z.; Li, W.; Liu, J. Fabrication and Characterization of Micro-Nano Electrodes for Implantable BCI. Micromachines 2019, 10, 242.

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