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Proceedings Paper

Potential applications of a small high-surface-area platinum electrode as an implanted impedance biosensor or recording electrode
Author(s): Yvonne Y. Duan; Rodney E. Millard; Michael Tykocinski; Xuguang Lui; Graeme M. Clark; Robert S. C. Cowan
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Paper Abstract

A small Platinum (Pt) electrode (geometric area: ~O.43 mm2) was treated in an electrochemical etching process, to produce a highly porous columnar thin layer (~6OO nm) on the surface of the electrode. The modified Pt electrode (Pt-p) showed similar electrical properties to a platinum-black electrode but with high mechanical integrity. Previous studies of chronic stimulation had also shown good biocompatibility and surface stability over several months implantation. This paper discusses the potential applications of the modified electrode as an implanted bio-sensor: (1) as a recording electrode compared to an untreated Pt electrode. (2) as a probe in detecting electrical characteristics of living biological material adjacent to the electrode in vivo, which may correlate to inflammation or trauma repair. Results of electrochemical impedance spectroscopy (EIS) revealed much lower electrode interface polarisation impedance, reduced overall electrode impedance, and a largely constant impedance above 100 Hz for the Pt-p electrode compared with untreated Pt electrodes. This provides a platform for recording biological events with low noise interference. Results of AC. impedance spectroscopy of the high surface area electrode only reflect changes in the surrounding biological environment in the frequency range (1 kHz to 100 kHz), interference from electrode polarisation impedance can be neglected. The results imply that the surface-modified electrode is a good candidate for application to implantable biosensors for detecting bio-electric events. The modification procedure and its high surface area concept could have application to a smart MEMS device or microelectrode.

Paper Details

Date Published: 21 March 2001
PDF: 8 pages
Proc. SPIE 4235, Smart Structures and Devices, (21 March 2001); doi: 10.1117/12.420852
Show Author Affiliations
Yvonne Y. Duan, Co-operative Research Ctr. for Cochlear Implant and Hearing Aid Innovation (Australia)
Rodney E. Millard, Co-operative Research Ctr. for Cochlear Implant and Hearing Aid Innovation (Australia)
Michael Tykocinski, Co-operative Research Ctr. for Cochlear Implant and Hearing Aid Innovation (Australia)
Xuguang Lui, Co-operative Research Ctr. for Cochlear Implant and Hearing Aid Innovation (Australia)
Graeme M. Clark, Co-operative Research Ctr. for Cochlear Implant and Hearing Aid Innovation and Univ. of M (Australia)
Robert S. C. Cowan, Co-operative Research Ctr. for Cochlear Implant and Hearing Aid Innovation and Univ. of Me (Australia)


Published in SPIE Proceedings Vol. 4235:
Smart Structures and Devices
Dinesh K. Sood; Ronald Albert Lawes; Vasundara V. Varadan, Editor(s)

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