Chromium-doped DLC for implants prepared by laser-magnetron deposition

Jelínek, M.; Kocourek, T.; Zemek, J.; Mikšovský, Jan; Kubinová, Šárka; Remsa, Jan; Kopeček, Jaromı́r; Jurek, K.

doi:10.1016/j.msec.2014.10.035

Cited by 50 publications

(24 citation statements)

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“…%). The same trend was observed in [15]. The higher value of adhesion for pure DLC layers (compared to Baragetti group) can be due to the application of the RF cleaning before the deposition and a further increase was reached by chromium doping.…”

Section: Resultssupporting

confidence: 75%

“…AFM showed that the layers were smooth, but with small amounts of random droplets -see Figure 3. Roughness (R a ) were calculated from 10×10 µm area (software NOVA P9) [15]. R a of our layers was measured on Si substrates about 0.2-0.7 nm and on metallic substrates about 1-6 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Adhesion -Macro scratch tester (REVETEST Scratch Tester -CSM co.) was used to determination of the adhesion [15]. Scratch test parameters are summarized in Table 2.…”

Section: Characterizationmentioning

confidence: 99%

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MECHANICAL PROPERTIES OF Cr-DLC LAYERS PREPARED BY HYBRID LASER TECHNOLOGY

Písařík

Jelı́nek

Remsa

et al. 2017

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Abstract. Diamond like carbon (DLC) layers have excellent biological properties for use in medicine for coating implants, but poor adhesion to biomedical alloys (titanium alloys, chromium alloys and stainless steel). The adhesion can be improved by doping the DLC layer by chromium, as described in this article. Chromium doped diamond like carbon layers (Cr DLC) were deposited by hybrid deposition system using KrF excimer laser (deposition diamond like carbon -graphite target) and magnetron sputtering (deposition chromium -chromium target). Carbon and chromium contents were determined by wavelength dispersive X-ray spectroscopy. Chromium content of Cr DLC layers was 0, 1, 2, 4-5 and 15 17 at.%. The topology and roughness of layers were studied using atomic force microscopy. Roughness of chromium doped DLC layers was measured on Si substrates about 0.2-0.7 nm and on metallic substrates about 1-6 nm. Mechanical properties were studied by nanoindentation. Hardness and reduced Young s modulus were reduced with rising the Cr content. Hardness and reduced Young s modulus reached from 15.0 GPa to 31.2 GPa and from 172.7 to 271.5 GPa, respectively. Films adhesion was determined by scratch test and reached 19 N for titanium substrates and for highest Cr concentration. Good adhesion to biomedical alloys and high DLC hardness will help to progress in the field of implantology.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

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MECHANICAL PROPERTIES OF Cr-DLC LAYERS PREPARED BY HYBRID LASER TECHNOLOGY

Písařík

Jelı́nek

Remsa

et al. 2017

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“…The methods therefore vary from posttreatment with ionizing radiation (5,6) to doping with different elements (7)(8)(9)(10)(11). The modification of sole surface areas is also under investigation.…”

Section: Introductionmentioning

confidence: 99%

Long-term stable surface modification of DLC coatings

Gotzmann

2017

Current Directions in Biomedical Engineering

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Abstract:The use of coatings based on diamond like carbon (DLC) for medical applications was established during the last years. Main advantages of these coatings are its high hardness, good wear and friction behavior and its biocompatibility. Using low-energy electron-beam treatment, we addressed the surface modification of DLC coatings. The aim was to generate new biofunctional surface characteristics that are long-term stable.Electron-beam modification resulted in significantly increased surface hydrophilicity, giving rise to the conclusion, that biological reaction on these surfaces will also be influenced by the modification. Furthermore, the stability of the surface modification was investigated. Therefore, the modified samples were stored for 8 weeks under ambient conditions. Additionally, the samples were stored in physiological saline solution at 37 °C for 8 weeks. The stability of the modification was analyzed by contact angle measurement confirming no changes over the whole period of storage. In addition, the stability against standard cleaning and sterilization procedures was investigated. The durability of the modification to withstand these cleaning procedures was also proven.With these findings, the low-energy electron-beam modification seems to be a suitable tool for surface modification of DLC coatings. Thereby, the very good longterm stability is a great improvement in comparison to conventional surface modification methods like plasma treatment. In order to investigate the suitability of the modified coatings for biomedical applications, the cellular response was investigated using human fibroblasts, revealing a significantly reduced cell count on modified surfaces while maintaining their biocompatibility. By modification of the DLC surfaces, it is possible to adapt the cell adhesion on the treated surface areas. These findings demonstrate electronbeam treatment to be applicable for partial surface modification and functionalization within biomedical applications.

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“…Roughness of doped films was comparable with the roughness of undoped DLC films. With increase of chromium content the roughness was slightly increasing [8] or decreasing [9]. Roughness Ra increased from about 0.62 nm to 1 nm (or decreased from 10 nm to 5 nm].…”

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confidence: 95%

Doped and Multilayer Biocompatible Materials Prepared by Hybrid Laser Deposition

Jelı́nek¹,

Kocourek²,

Remsa³

et al. 2018

IJBBB

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Abstract:Hybrid laser technology for synthesizing doped, nanocomposite, single and multilayers of amorphous or nanocrystalline materials are presented. The technique use method of pulsed laser deposition (PLD) or combination of PLD with magnetron sputtering, radiofrequency discharges or two PLD running together. Examples of deposition and study of doped biocompatible materials as Cr: DLC, Ti: DLC, Ag: DLC, Ag: hydroxyapatite, and enhancement of sp3-DLC layers bonds by in situ ion gun bombardment are given.Key words: PLD, hybrid PLD, biocompatible coating, implants. IntroductionBiomaterials, i.e. natural or artificial materials designed for application in biotechnologies and medicine, are widely used for replacing irreversibly damaged tissues in the human body. Biomaterials have to meet the requirements for well-functioning and long-term durability of the implants, namely biocompatibility, good corrosion and fatigue resistance, wear resistance and biomechanical compatibility [1]. In many cases a single coating material alone cannot fulfil the technical requirements. To improve physical, mechanical and biocompatible properties of implant coatings, the layers can be doped (enriched) with other elements.The cheapest way for laser fabrication of doped biocompatible coating is to cover the rotating target material (matrix) with a piece of dopant material. But in present study of layers, multilayers and superlattices of doped biocompatible materials the focus is on increasing flexibility and range of deposition conditions by way of combining PLD with magnetron sputtering (MS), PLD with RF discharges, ion gun layers modification and on the combination of two simultaneously running PLD systems (dual PLD). The methods allow carefully study the influence of dopation on a large scale of dopants and to create nanocomposite biomaterials of new properties [2] Experiences with deposition of chromium, silver and titanium doped diamond-like carbon (DLC) and hydroxyapatite (HA) films and ferroelectric BaTiO3 multilayers for coating of metallic bone implants are presented. Layers of different dopants concentration and ferroelectric-based multilayers were prepared. Overwiev of our research in that direction and the results of physical and biomedical analysis are presented in summary. The doped and multilayer biocompatible coatings were prepared by PLD, PLD combined with radiofrequency discharges (RF), PLD with magnetron sputtering (MS), PLD with ion bombardment, and by dual PLD. The two KrF excimer lasers (LUMONICS PM 842, λ = 248 nm, τ = 20 ns and COMPexProTM 205 F, λ = 248 nm, τ = 20 ns) were used. (Fig. 1) The energy density of laser beam on the target ranged from 2 to 16 Jcm -2 , repetition rate of pulses were from 1 to 50 Hz, argon atmosphere pressure from 10 -4 Pa (vacuum) to 1 Pa. Thin layers of DLC were deposited on fused silica (FS), Si (100) or metallic substrates. The substrate deposition temperature for DLC films was T S = 20°C. The target-substrate distance (D T-S ) was 45 mm for PLD, 85 mm for MS, and 260 mm for ion bo...

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Chromium-doped DLC for implants prepared by laser-magnetron deposition

Cited by 50 publications

References 49 publications

MECHANICAL PROPERTIES OF Cr-DLC LAYERS PREPARED BY HYBRID LASER TECHNOLOGY

MECHANICAL PROPERTIES OF Cr-DLC LAYERS PREPARED BY HYBRID LASER TECHNOLOGY

Long-term stable surface modification of DLC coatings

Doped and Multilayer Biocompatible Materials Prepared by Hybrid Laser Deposition

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