Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Evgeniia S. Vikulova, Danila B. Kal'nyi, Yury V. Shubin, Vasily V. Kokovkin, Natalya B. Morozova, Aseel Hassan, Tamara V. Basova

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The present work demonstrates the application of the Metal-Organic Chemical Vapor Deposition technique to fabricate metal iridium coatings onto the pole tips of endocardial electrodes. Using iridium (III) acetylacetonate as a volatile precursor, the target coatings were successfully applied to the working surface of cathodes and anodes of pacemaker electrodes in the flow type reactor in hydrogen atmosphere at deposition temperature of 550 °C. The coating samples were characterized by means of XRD, SEM, Raman- and XPS-spectroscopies. The formation of non-textured coatings with fractal-like morphology and 7–24 nm crystallite size has been realized. The electrochemical properties of the coatings were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The charge storage capacity values of the electrochemically activated samples were 17.0–115 mC cm−2 and 14.4–76.5 mC cm−2 for measurements carried out in 0.1 M sulfuric acid and in phosphate buffer saline solutions, respectively. A comparison of some characteristics of the samples obtained with commercially available cathode of pacemaker electrodes is also presented.

Original languageEnglish
Pages (from-to)1052-1058
Number of pages7
JournalApplied Surface Science
Volume425
DOIs
Publication statusPublished - 15 Dec 2017

Keywords

  • Charge storage capacity
  • Electrode
  • Iridium coating
  • MOCVD
  • Pacemaker
  • ACETYLACETONATE
  • CHARGE-INJECTION
  • CHEMICAL-VAPOR-DEPOSITION
  • PLATINUM
  • IRIDIUM OXIDE-FILMS
  • NEURAL STIMULATION
  • GROWTH
  • SURFACE
  • DEVICES

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