Iridium‐Bismuth‐Oxide Coatings for Use in Neural Stimulating Electrodes: The Influence of Ir/Bi Ratio

Implantable neural prosthetics with stimulating electrodes are increasingly employed in medical practices to treat neural disabilities. The electrode material is expected to provide high charge storage and injection capacity (CSC/CIC) and low impedance for safe, efficient, and precise neural stimulation, while at the same time, being small. To improve the current state-of-the-art neural-electrode material, iridium oxide (IrOx), Ir<sub>m</sub>Bi<sub>1-m</sub>Ox coatings of various compositions (m = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) produced by thermal deposition were evaluated. The Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox yielded a CSC of 17.7 ± 1.1 mC/cm<sup>2</sup>, which is four-fold higher than that of IrOx. At the same time, the impedance of Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox at 1 kHz was measured to be half of that of IrOx. The superior performance of Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox was explained by forming amorphous structures that facilitate the intercalation of H<sup>+</sup> and OH<sup>-</sup> ions into deeper oxide structures that contribute to faradaic charge storage. The Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox electrode also showed good stability and biocompatibility, which makes it potentially a good candidate for neural stimulating electrodes.

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Publication Details

Journal
Journal of Biomedical Materials Research Part A
Published
2025-06-27
DOI
https://doi.org/10.1002/jbm.a.37956
Citations
1
Primary Topic
Neuroscience and Neural Engineering
Type
article
Field-Weighted Citation Impact
0.91

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article

Iridium‐Bismuth‐Oxide Coatings for Use in Neural Stimulating Electrodes: The Influence of Ir/Bi Ratio

Sasha Omanovic, Heather D. Durham, Xingge Xu, Sandra Minotti et al.
1 citations
Journal of Biomedical Materials Research Part A
Neuroscience and Neural Engineering
0.91
article

Iridium‐Bismuth‐Oxide Coatings for Use in Neural Stimulating Electrodes: The Influence of Ir/Bi Ratio

Sasha Omanovic, Heather D. Durham, Xingge Xu, Sandra Minotti, Imran Ali
article en
1 citations

Abstract

Implantable neural prosthetics with stimulating electrodes are increasingly employed in medical practices to treat neural disabilities. The electrode material is expected to provide high charge storage and injection capacity (CSC/CIC) and low impedance for safe, efficient, and precise neural stimulation, while at the same time, being small. To improve the current state-of-the-art neural-electrode material, iridium oxide (IrOx), Ir<sub>m</sub>Bi<sub>1-m</sub>Ox coatings of various compositions (m = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) produced by thermal deposition were evaluated. The Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox yielded a CSC of 17.7 ± 1.1 mC/cm<sup>2</sup>, which is four-fold higher than that of IrOx. At the same time, the impedance of Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox at 1 kHz was measured to be half of that of IrOx. The superior performance of Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox was explained by forming amorphous structures that facilitate the intercalation of H<sup>+</sup> and OH<sup>-</sup> ions into deeper oxide structures that contribute to faradaic charge storage. The Ir<sub>0.8</sub>Bi<sub>0.2</sub>Ox electrode also showed good stability and biocompatibility, which makes it potentially a good candidate for neural stimulating electrodes.

Journal of Biomedical Materials Research Part AVol. 113(7)
The University of Agriculture, Peshawar (PK), University of Peshawar (PK), McGill University (CA), University of Engineering and Technology Peshawar (PK)
Natural Sciences and Engineering Research Council of Canada
Openalex Percentile: Top 25%
Neuroscience and Neural Engineering
0.91
DOIOpen Access PDFOpenAlex
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Iridium‐Bismuth‐Oxide Coatings for Use in Neural Stimulating Electrodes: The Influence of Ir/Bi Ratio — Sasha Omanovic, Heather D. Durham, et al. · Journal of Biomedical Materials Research Part A (2025) | TGRS Research Map | TGRS