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Fabrication of Nanoporous IrO2/Ir Films for Bioelectrode and Neural Prosthesis Applications

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IrO2 and Ir are attractive materials for bio-interface applications due to their desirable stability, electrochemical performance, and biocompatibility. Nanostructured IrO2/Ir possesses several advantageous properties including large surface-to-volume ratio, light weight, super hydrophilic surface, desirable electrochemical capability, and cell adhesion. Herein, we employ a cost-effective process to fabricate uniform nanoporous IrO2/Ir film by chemical bath deposition, high-vacuum annealing, and electrochemical activation. High-vacuum annealing can remove oxygen from an IrO2 film to create a nanoporous structure, and we determine the optimized electrochemical activation to transform Ir to IrO2/Ir. The surface morphology, roughness, hydrophilicity, crystallinity, oxidation state, and charge storage capacity (CSC) of the films were analyzed. The nanoporous IrO2/Ir film showed a 25% increase of CSC compared to the dense IrO2 film, and this excellent performance makes it a promising candidate for bio-interface applications. In addition, this fabrication route can be cost-effective process without wasting the expensive noble metal Ir material.
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Document Type: Research Article

Publication date: April 1, 2018

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  • Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.
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