Synthesis and characterization of iridium oxide thin film via a pre-coordination step for bio-stimulating electrode application

Tsai Wei Chung, Ming Ting Hsieh, Kuang Chih Tso, Shuo Hsiu Kuo, Chien Tai Cheng, Jiashing Yu, Ting Shan Chan, Pu-Wei Wu*, Po Chun Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

An effective solution-based process is developed for the fabrication of iridium oxide thin film in application of bio-stimulating electrode. The chemical bath employs a pre-coordination scheme in which the IrCl6 3− precursor undergoes a ligand exchange step to form stable Ir(OH)6 3−, followed by an oxidative electroless deposition to render iridium oxide thin film with desirable surface morphologies. Relevant processing parameters have been optimized to increase the utilization rate of Ir precursor for a thicker deposit without any noticeable defect. The iridium oxide thin film is mechanically robust and exhibits superior performances in both charge storage capacity and charge injection capacity. In particular, the normalized charge storage capacity is recorded at 0.367 mC/(cm2˙nm), a value that is five times greater than comparable iridium oxide thin films. In addition, in cell viability test, the iridium oxide thin film demonstrates impressive biocompatibility with desirable growth of neuronal cells.

Original languageEnglish
Article numberB
Pages (from-to)18648-18655
Number of pages7
JournalCeramics International
Volume46
Issue number11
DOIs
StatePublished - 1 Aug 2020

Keywords

  • Bio-stimulating electrode
  • Chemical bath deposition
  • Iridium oxide
  • Pre-coordination
  • X-ray absorption spectroscopy
  • RETINAL PROSTHESIS
  • NEURAL STIMULATION
  • FABRICATION
  • ELECTROCATALYSTS
  • DEPOSITION
  • STABILITY
  • ARRAY
  • ACID

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