April 2010
Volume 51, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2010
Characterization of Electrochemically-Treated Platinum Bulk Electrodes
Author Affiliations & Notes
  • Y. Terasawa
    Vision Institute,
    NIDEK Co., Ltd., Gamagori, Japan
  • H. Tashiro
    Div of Med Tech, Dept of Health Sci, Faculty of Med Sci, Kyushu University, Fukuoka, Japan
  • K. Osawa
    Vision Institute,
    NIDEK Co., Ltd., Gamagori, Japan
  • A. Yabusaki
    Vision Institute,
    NIDEK Co., Ltd., Gamagori, Japan
  • M. Ozawa
    NIDEK Co., Ltd., Gamagori, Japan
  • T. Noda
    Grad Schl of Materials Sci, Nara Inst of Science & Tech, Ikoma, Japan
  • J. Ohta
    Grad Schl of Materials Sci, Nara Inst of Science & Tech, Ikoma, Japan
  • Footnotes
    Commercial Relationships  Y. Terasawa, Nidek Co., Ltd., E; H. Tashiro, Nidek Co., Ltd., F; K. Osawa, Nidek Co., Ltd., E; A. Yabusaki, Nidek Co., Ltd., E; M. Ozawa, Nidek Co., Ltd., E; T. Noda, Nidek Co., Ltd., F; J. Ohta, Nidek Co., Ltd., F.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 3033. doi:https://doi.org/
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    • Get Citation

      Y. Terasawa, H. Tashiro, K. Osawa, A. Yabusaki, M. Ozawa, T. Noda, J. Ohta; Characterization of Electrochemically-Treated Platinum Bulk Electrodes. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3033. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : We have previously proposed a method to realize large-surface-area platinum electrodes using bulk micromachining (Terasawa et al. ARVO 2008).The purpose of this study is to improve the charge injection capability of the electrodes by enhancing its surface area and to characterize them.

Methods: : Bullet-shaped electrodes were cut out with a turning machine from a bulk platinum bar. After cable connection and substrate formation, the electrodes were immersed in PBS at room temperature and DC voltage between -5.0V and +5.0V vs. return electrode (large stainless steel foil) was applied periodically for 15.5 hours. The electrodes were characterized by scanning electron microscopy, cross section analysis, cyclic voltammetry and surface-area estimation.

Results: : Highly porous surfaces were obtained after electrochemical etching. Scanning electron microscopy of the cross section of the etched electrodes revealed that positions of crystal grain boundary corresponded with microstructures of the electrodes' surface after etching. An increase of the surface area of the electrode was confirmed both in cyclic voltammogram and voltage waveform. The roughness factor of the electrode increased from 5 to 53 in average after etching.

Conclusions: : We succeeded in enhancing surface area of bullet-shaped electrodes through electrochemical etching. We are planning a study of optimization of the etching condition as well as long-term stimulation study in vitro and in vivo to ensure the durability of the electrodes.

Keywords: retina • sclera 
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