Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Sensors and Materials,
Volume 30, Number 2 (2018)

Copyright(C) MYU K.K. All Rights Reserved.
pp. 213-224
S&M1486
https://doi.org/10.18494/SAM.2018.1717
Published: January 26, 2018

Electrochemical Evaluation of Geometrical Effect and Three-dimensionalized Effect of Iridium Oxide Electrodes Used for Retinal Stimulation [PDF]

Toshihiko Noda, Yoshiko Noda, Po-Chun Chen, Makito Haruta, Kiyotaka Sasagawa, Takashi Tokuda, Chung-Yu Wu, and Jun Ohta

(Received July 31, 2017; Accepted October 6, 2017)

Keywords: retinal prosthesis, neural stimulation, stimulus electrode, three-dimensional electrode, iridium oxide

The geometry dependence and three-dimensionalized effect of the electrochemical properties of iridium oxide electrodes used in retinal prosthesis are discussed herein. Planar electrodes with various geometries were fabricated. Three-dimensional electrodes with microfabricated resin cores were also fabricated. The charge storage capacity (CSC) and charge injection capacity (CIC), both of which are important properties for neural stimulation, were quantitatively evaluated. This evaluation showed an important electrode property that the surface area dominantly affects the CSC. On the other hand, the CIC was not proportionally related to the electrode area, confirming that the edge region of the electrodes is significant in the mechanism of action. Moreover, performance enhancement with a three-dimensionalized electrode was clearly confirmed. The fundamental properties of highly effective stimulus electrodes were successfully evaluated and a detailed discussion is presented.

Corresponding author: Toshihiko Noda


Cite this article
Toshihiko Noda, Yoshiko Noda, Po-Chun Chen, Makito Haruta, Kiyotaka Sasagawa, Takashi Tokuda, Chung-Yu Wu, and Jun Ohta, Electrochemical Evaluation of Geometrical Effect and Three-dimensionalized Effect of Iridium Oxide Electrodes Used for Retinal Stimulation, Sens. Mater., Vol. 30, No. 2, 2018, p. 213-224.


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