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Sensors 2015, 15(6), 14345-14355; doi:10.3390/s150614345

Electrical Characterization of 3D Au Microelectrodes for Use in Retinal Prostheses

Department of Electrical and Computer Engineering, ISRC/ASRI, Seoul National University, Seoul 151-742, Korea
Department of Ophthalmology, College of Medicine, Seoul National University, Seoul 110-744, Korea
Author to whom correspondence should be addressed.
Academic Editor: Alexander Star
Received: 31 December 2014 / Accepted: 9 June 2015 / Published: 17 June 2015
(This article belongs to the Section Biosensors)
View Full-Text   |   Download PDF [4091 KB, uploaded 17 June 2015]   |  


In order to provide high-quality visual information to patients who have implanted retinal prosthetic devices, the number of microelectrodes should be large. As the number of microelectrodes is increased, the dimensions of each microelectrode must be decreased, which in turn results in an increased microelectrode interface impedance and decreased injection current dynamic range. In order to improve the trade-off envelope between the number of microelectrodes and the current injection characteristics, a 3D microelectrode structure can be used as an alternative. In this paper, the electrical characteristics of 2D and 3D Au microelectrodes were investigated. In order to examine the effects of the structural difference, 2D and 3D Au microelectrodes with different base areas but similar effective surface areas were fabricated and evaluated. Interface impedances were measured and similar dynamic ranges were obtained for both 2D and 3D Au microelectrodes. These results indicate that more electrodes can be implemented in the same area if 3D designs are used. Furthermore, the 3D Au microelectrodes showed substantially enhanced electrical durability characteristics against over-injected stimulation currents, withstanding electrical currents that are much larger than the limit measured for 2D microelectrodes of similar area. This enhanced electrical durability property of 3D Au microelectrodes is a new finding in microelectrode research, and makes 3D microelectrodes very desirable devices. View Full-Text
Keywords: retinal prosthesis; 3D microelectrode; current stimulation; interface impedance; electrical durability retinal prosthesis; 3D microelectrode; current stimulation; interface impedance; electrical durability

Figure 1a

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, S.; Ahn, J.H.; Seo, J.-M.; Chung, H.; Cho, D.-I. Electrical Characterization of 3D Au Microelectrodes for Use in Retinal Prostheses. Sensors 2015, 15, 14345-14355.

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