Journal article

Correlation of Impedance and Effective Electrode Area of Iridium Oxide Neural Electrodes

Alexander R Harris, Antonio G Paolini

AUSTRALIAN JOURNAL OF CHEMISTRY | CSIRO PUBLISHING | Published : 2017

Abstract

Iridium oxide is routinely used for bionic applications owing to its high charge injection capacity. The electrode impedance at 1kHz is typically reported to predict neural recording performance. In this article, the impedance of activated iridium oxide films (AIROFs) has been examined. The impedance of unactivated iridium electrodes was half that of platinum electrodes of similar geometry, indicating some iridium oxide was present on the electrode surface. A two time constant equivalent circuit was used to model the impedance of activated iridium. The impedance at low and intermediate frequencies decreased with increasing number of activation pulses and total activation charge. The impedanc..

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Grants

Awarded by Australian Research Council Centre of Excellence Scheme


Funding Acknowledgements

ARH would like to congratulate Professor Alan M. Bond on his birthday and acknowledge his role as a supervisor and mentor. Funding from the Australian Research Council Centre of Excellence Scheme (Project number CE140100012) is gratefully acknowledged.