TY - JOUR

T1 - Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

AU - Vikulova, Evgeniia S.

AU - Kal'nyi, Danila B.

AU - Shubin, Yury V.

AU - Kokovkin, Vasily V.

AU - Morozova, Natalya B.

AU - Hassan, Aseel

AU - Basova, Tamara V.

PY - 2017/12/15

Y1 - 2017/12/15

N2 - 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.

AB - 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.

KW - Charge storage capacity

KW - Electrode

KW - Iridium coating

KW - MOCVD

KW - Pacemaker

KW - ACETYLACETONATE

KW - CHARGE-INJECTION

KW - CHEMICAL-VAPOR-DEPOSITION

KW - PLATINUM

KW - IRIDIUM OXIDE-FILMS

KW - NEURAL STIMULATION

KW - GROWTH

KW - SURFACE

KW - DEVICES

UR - http://www.scopus.com/inward/record.url?scp=85025121259&partnerID=8YFLogxK

U2 - 10.1016/j.apsusc.2017.07.100

DO - 10.1016/j.apsusc.2017.07.100

M3 - Article

AN - SCOPUS:85025121259

VL - 425

SP - 1052

EP - 1058

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

ER -