Multi-doped diamond like-carbon coatings (DLC-Si/Ag) for biomedical applications fabricated using the modified chemical vapour deposition method
| Autor: | Lidia Swiatek, Marta Kaminska, A. Jedrzejczak, J. Grabarczyk, Anna Sobczyk-Guzenda, Witold Szymanski, Witold Jakubowski, Anna Olejnik, Dorota Bociaga |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Diamond-like carbon Silicon chemistry.chemical_element Nanotechnology 02 engineering and technology Chemical vapor deposition 01 natural sciences symbols.namesake X-ray photoelectron spectroscopy 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering 010302 applied physics Mechanical Engineering Titanium alloy General Chemistry Nanoindentation 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials Carbon film Chemical engineering chemistry symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Diamond and Related Materials. 67:54-62 |
| ISSN: | 0925-9635 |
| Popis: | In this study the Si/Ag-incorporated DLC layers were deposited on titanium alloy (Ti6Al7Nb) using modified radio frequency plasma assisted chemical vapour deposition (RF PACVD) method and examined in terms of chemical, mechanical and biological properties. The modified RF PACVD method allows to dope carbon coatings with silicon and silver during one process and in one chamber. In order to determine the chemical composition, morphology and structure of the manufactured coatings the XPS, FTIR and Raman spectroscopy, as well as SEM observation and EDS analysis were performed. The obtained results were correlated with the biological response of the coatings. The viability of cells in contact with the examined surfaces was evaluated using LIVE/DEAD test and endothelial cells, while the bactericidal activity was assessed using Escherichia coli. The XPS results showed that the Si content in the films ranged from 1.65 at.% up to 2.94 at.%, while the Ag content was from 1.36 at.% up to 2.09 at.%. SEM observation and EDS analysis proved that with the increasing Ag content, the number of Ag conglomerates increases. FTIR analysis confirmed that the Ag contained in the deposited carbon films is not in metallic state and it creates chemical bonds with silicon and oxygen (Si–O–Ag groups). Mechanical properties were measured using nanoindentation technique. The growing concentration of Ag causes the decrease in the concentration of Si, what ultimately results in decreased hardness, higher bactericidal activity and lower biocompatibility. Results demonstrated that the DLC coating containing 2.94 at.% of Si and 1.36 at.% of Ag is optimal in terms of medical applications as an antibacterial coating. |
| Databáze: | OpenAIRE |
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