Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Vikulova, E. S.; Kal’nyi, D. B.; Shubin, Yu. V.; Коковкин, В. В.; Morozova, N. B.; Hassan, Aseel; Basova, Tamara V.

doi:10.1016/j.apsusc.2017.07.100

Cited by 17 publications

(5 citation statements)

References 44 publications

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“…In addition, it is important to note that the Ir(acac) 3 has a relatively high vapor thermal stability in the presence of hydrogen [53]. Therefore, iridium films can be successfully deposited at temperatures above 400 • C [53,66]. At the same time, lower temperatures are favorable for preventing both the agglomeration of primary metallic particles and thermally induced strong changes of the substrate.…”

Section: Composition and Microstructure Of Compact Iridium Sublayers ...mentioning

confidence: 99%

Application of Biocompatible Noble Metal Film Materials to Medical Implants: TiNi Surface Modification

et al. 2023

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Recently, film materials based on the combination of noble metals have showed promising results for surface modification of medical implants, allowing both to improve biocompatibility and to acquire the increased antibacterial effect. An important challenge here is to combine the developed coating morphology, which is favorable for biological response, with a high protective function, which, on the contrary, requires a compact coating microstructure. In this work, we aimed to solve this problem with respect to the TiNi implant material. We have tested two types of compact thin sublayers: Iridium (Ir’), formed by metal-organic chemical vapor deposition (MOCVD), and gold (Au), formed by physical vapor deposition (PVD). Subsequently these sublayers were coated with a developed-columnar-iridium (Ir) by MOCVD. Features of the microstructure, chemical and phase composition of all these film materials were studied using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The changes in the characteristics of TiNi martensitic transformation due to MOCVD experiments were also studied by differential scanning calorimetry (DSC). The biocompatibility of Ir’/TiNi, Au/TiNi, Ir/Ir’/TiNi, Ir/Au/TiNi samples was assessed by cytoxicity testing (Man-1 cells) and measuring of nickel content in the biological extracts. The application of both sublayers effectively reduces the release of nickel, which was previously shown for Ir/TiNi samples. This prevents the toxic effect. Note that the Ir’ sublayer better protects against nickel release, while the Au sublayer promotes cell proliferation.

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Section: Composition and Microstructure Of Compact Iridium Sublayers ...mentioning

confidence: 99%

Application of Biocompatible Noble Metal Film Materials to Medical Implants: TiNi Surface Modification

et al. 2023

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“…The prospects of the application of the MOCVD technique to fabricate high-surfacearea noble metal coatings of various compositions on the pole tips of medical electrodes have been demonstrated in a series of our recent works [100,123,[128][129][130]. In particular, metallic iridium coatings were produced using a conventional precursor Ir(acac) 3 in a reducing atmosphere [128]. These samples were further employed as templates for the electrochemical preparation of activated iridium oxide films (AIROFs).…”

Section: Mocvd Of Platinum and Iridium For Medical Applicationmentioning

confidence: 99%

Volatile Iridium and Platinum MOCVD Precursors: Chemistry, Thermal Properties, Materials and Prospects for Their Application in Medicine

et al. 2021

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Interest in iridium and platinum has been steadily encouraged due to such unique properties as exceptional chemical inertia and corrosion resistance, high biological compatibility, and mechanical strength, which are the basis for their application in medical practice. Metal-organic chemical vapor deposition (MOCVD) is a promising method to fabricate Ir and Pt nanomaterials, multilayers, and heterostructures. Its advantages include precise control of the material composition and microstructure in deposition processes at relatively low temperatures onto non-planar substrates. The development of MOCVD processes is inextricably linked with the development of the chemistry of volatile precursors, viz., specially designed coordination and organometallic compounds. This review describes the synthesis methods of various iridium and platinum precursors, their thermal properties, and examples of the use of MOCVD, including formation of films for medical application and bimetallics. Although metal acetylacetonates are currently the most widely used precursors, the recently developed heteroligand Ir(I) and Pt(IV) complexes appear to be more promising in both synthetic and thermochemical aspects. Their main advantage is their ability to control thermal properties by modifying several types of ligands, making them tunable to deposit films onto different types of materials and to select a combination of compatible compounds for obtaining the bimetallic materials.

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“…The complex of Ir properties opens up wide opportunities for the use of bulk materials and thin coatings in high-tech fields of science and technology. Such materials are used to protect rocket engine nozzles [2], in tools for the production of high-quality glasses [3], crucibles [4], heavy metal ion sensors [5], microelectronics [6,7], medicine [8], mirrors of X-ray telescopes [9], and elements of optical systems of spacecraft [10]. Thin Ir layers are used as an effective barrier to prevent the diffusion of carbon [11] and oxygen [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of ion assistance parameters on the properties of Ir coatings

Kamenetskikh¹,

Гаврилов²

2022

8th International Congress on Energy Fluxes and Radiation Effects

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Iridium coatings were deposited on Ni substrates by magnetron sputtering with ion assistance in the plasma of a low-energy electron beam. The influence of the parameters of the ion flux on the surface of the growing coating on the microstructure, the intrinsic stresses, and the adhesion of the coating is investigated. It is shown that deposition of a coating with a dense microstructure at a low homologous temperature (~0.15) is provided under the optimal ratio of the ion current density to Ir flux ~0.5 and the ion energy ~150 eV. The coatings deposited in the optimal mode are characterized by microdistortions of the crystal lattice of ~0.9% and have a predominant crystallite orientation (111), which is a favorable factor for providing corrosion protection. A low level of intrinsic stresses (~0.5 GPa) and a high adhesion strength of the coatings (the value of the critical load at nanoindentation is more than 3000 mN) have been achieved.

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Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Cited by 17 publications

References 44 publications

Application of Biocompatible Noble Metal Film Materials to Medical Implants: TiNi Surface Modification

Application of Biocompatible Noble Metal Film Materials to Medical Implants: TiNi Surface Modification

Volatile Iridium and Platinum MOCVD Precursors: Chemistry, Thermal Properties, Materials and Prospects for Their Application in Medicine

Effect of ion assistance parameters on the properties of Ir coatings

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