Oxygen Reduction on Supported Iridium Oxide Films in Neutral Phosphate Buffer: Implications for Neural Stimulation

2010 ◽  
Vol 13 (6) ◽  
pp. F3 ◽  
Author(s):  
Youjiang Chen ◽  
Michelle Rasmussen ◽  
Daniel Scherson
Keyword(s):  
Oxygen Reduction ◽  
Phosphate Buffer ◽  
Oxide Films ◽  
Iridium Oxide ◽  
Neural Stimulation

scholarly journals Sputtered iridium oxide films for neural stimulation electrodes

2009 ◽  
Vol 89B (2) ◽  
pp. 353-361 ◽  
Author(s):  
Stuart F. Cogan ◽  
Julia Ehrlich ◽  
Timothy D. Plante ◽  
Anton Smirnov ◽  
Douglas B. Shire ◽  
...  
Keyword(s):  
Oxide Films ◽  
Iridium Oxide ◽  
Neural Stimulation

Electronic structure of iridium oxide films formed in neutral phosphate buffer solution

1998 ◽  
Vol 441 (1-2) ◽  
pp. 5-12 ◽  
Author(s):  
T.M. Silva ◽  
A.M.P. Simões ◽  
M.G.S. Ferreira ◽  
M. Walls ◽  
M. Da Cunha Belo
Keyword(s):  
Electronic Structure ◽  
Phosphate Buffer ◽  
Oxide Films ◽  
Phosphate Buffer Solution ◽  
Iridium Oxide ◽  
Buffer Solution

scholarly journals Contribution of Oxygen Reduction to Charge Injection on Platinum and Sputtered Iridium Oxide Neural Stimulation Electrodes

2010 ◽  
Vol 57 (9) ◽  
pp. 2313-2321 ◽  
Author(s):  
Stuart F Cogan ◽  
Julia Ehrlich ◽  
Timothy D Plante ◽  
Marcus D Gingerich ◽  
Douglas B Shire
Keyword(s):  
Oxygen Reduction ◽  
Charge Injection ◽  
Iridium Oxide ◽  
Neural Stimulation

Over-pulsing degrades activated iridium oxide films used for intracortical neural stimulation

2004 ◽  
Vol 137 (2) ◽  
pp. 141-150 ◽  
Author(s):  
Stuart F Cogan ◽  
Andrew A Guzelian ◽  
William F Agnew ◽  
Ted G.H Yuen ◽  
Douglas B McCreery
Keyword(s):  
Oxide Films ◽  
Iridium Oxide ◽  
Neural Stimulation

Metal-non metal transition in electrochromic sputtered iridium oxide films

1987 ◽  
Vol 64 (5) ◽  
pp. 645-650 ◽  
Author(s):  
R. Sanjinés ◽  
A. Aruchamy ◽  
F. Lévy
Keyword(s):  
Oxide Films ◽  
Iridium Oxide

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

2017 ◽  
Vol 70 (9) ◽  
pp. 1016 ◽  
Author(s):  
Alexander R. Harris ◽  
Antonio G. Paolini
Keyword(s):  
Charge Density ◽  
Iridium Oxide ◽  
Neural Stimulation ◽  
Electrode Impedance ◽  
Platinum Electrodes ◽  
High Charge ◽  
State Diffusion ◽  
High Charge Density ◽  
Steady State Diffusion ◽  
Total Activation

Iridium oxide is routinely used for bionic applications owing to its high charge injection capacity. The electrode impedance at 1 kHz 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 impedance at 12 Hz correlated with the steady-state diffusion electroactive area. The impedance at 12 Hz also correlated with the charge density of the electrode. The high charge density and low impedance of AIROFs may provide improved neural stimulation and recording properties compared with typically used platinum electrodes.

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