4.7 Article

Space-controllable TiO2@IrO2 core-shell nanotube array as a bio-interface electrode

期刊

SURFACE & COATINGS TECHNOLOGY
卷 435, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2022.128271

关键词

Iridium oxide; TiO2@IrO2 ; Core@shell; Nanotube array; Chemical bath deposition; Bio-interface electrode

资金

  1. Ministry of Science and Technology of Taiwan [MOST 107-2221-E-027-009-MY2, 109-2221-E-027060, MOST 110-2321-B-009-004, 110-2221-E-027-022-MY3]
  2. Center for Neuromodulation Medical Electronics Systemsfrom The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education in Taiwan

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This study develops a wet chemical approach to fabricate space-controllable TiO2@IrO2 core@shell nanotube arrays. The nanotube arrays exhibit large charge storage capacity, good crystallinity, and stability, making them suitable for neural activity applications.
This study develops a wet chemical approach to fabricate space-controllable TiO2@IrO2 core@shell nanotube arrays. The process begins with the space-controlling anodization of the TiO2 nanotube array, followed by a chemical bath deposition of IrO2. IrO2 uniformly covers the nanotubular TiO2 with a thickness range of 8- 15 nm. Charge storage capacity (CSC) and electrochemical impedance spectroscopy (EIS) are performed to evaluate the TiO2@IrO2 core-shell nanotube array as an electrode for neural activity application. Electron microscopy images confirm the formation of uniform IrO2 films on both inner and outer nanotube surfaces. An X-ray diffraction pattern shows a good crystallinity of the TiO2@IrO2 core-shell nanotube array. The TiO2@IrO2 core-shell nanotube array presents a large charge storage capacity of 42.84 mC/cm(2) attributed to the high-aspect-ratio tubular nanostructure with a conformal IrO2 deposition. Additionally, the TiO2@IrO2 core-shell nanotube array exhibits stability, durability, and good biocompatibility.

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