Characteristic of silicon doped diamond like carbon thin films on surface properties and human serum albumin adsorption

Ahmed, Mukhtar H.; Byrne, John; Ahmed, Waqar

doi:10.1016/j.diamond.2015.03.016

Cited by 27 publications

(18 citation statements)

References 46 publications

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“…It should be mentioned, that an increase of the oxygen atomic concentration with Si amount in DLC:Si films was reported by other authors, too [12,18]. In numerous studies, relatively large amounts of oxygen, comparable with the present study or even higher, were reported for both hydrogenated [18,20,21] and hydrogen-free [12,17] DLC:Si films. In other case, O atomic concentration increased for DLC:Si films deposited by plasma-enhanced chemical vapor deposition from tetramethylsilane (TMS) only in comparison with the films deposited from the mixture of C 2 H 2 and TMS [18].…”

Section: Chemical Compositionsupporting

confidence: 88%

“…It should be mentioned that such behavior was reported in numerous studies for both hydrogen-free and hydrogenated DLC films containing silicon or SiO x [8,[33][34][35][36]. G peak position downshift to 1505 cm −1 [21], 1495 cm −1 [23], 1480 cm −1 [12] and even as low as 1460 cm −1 [17,19] was reported. In those studies, the changes were explained by the increased sp 3 /sp 2 carbon bond ratio.…”

Section: Structurementioning

confidence: 52%

“…Properties of DLC films can be additionally controlled by introducing chemical elements other than carbon or hydrogen [1,[3][4][5][6][7][8]. Particularly, silicon is one of the most often used DLC dopants [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Reduced internal stress and friction coefficient, as well as increased thermal resistance, while keeping high hardness of Si doped diamond-like carbon films were reported [9].…”

Section: Introductionmentioning

confidence: 99%

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Diamond Like Carbon Films Containing Si: Structure and Nonlinear Optical Properties

et al. 2020

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In the present research diamond-like carbon (DLC) films containing 4–29 at.% of silicon were deposited by reactive magnetron sputtering of carbon target. Study by X-ray photoelectron spectroscopy revealed the presence of Si–C bonds in the films. Nevertheless, a significant amount of Si–O–C and Si–Ox bonds was present too. The shape of the Raman scattering spectra of all studied diamond-like carbon containing silicon (DLC:Si) films was typical for diamond-like carbon. However, some peculiarities related to silicon doping were found. Studies on the dependence of DLC:Si of the optical transmittance spectra on the Si atomic concentration have shown that doping by silicon affects linear, as well as nonlinear, optical properties of the films. It is shown that the normalized reflectance of DLC:Si films decreased with the increased exciting light fluence. No clear relation between the normalized reflectance and photoexcited charge carrier relaxation time was found. It was suggested that that the normalized reflectance decrease with fluence can be related to nonlinear optical properties of the hydrogenated diamond-like carbon phase in DLC:Si film.

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Section: Chemical Compositionsupporting

confidence: 88%

Section: Structurementioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

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Diamond Like Carbon Films Containing Si: Structure and Nonlinear Optical Properties

et al. 2020

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“…Such layers containing Si tended to increase the water contact angle, i.e., becoming more hydrophobic. A similar effect was confirmed by Ahmed et al [47]. Wettability may thus play an important role in increasing human serum albumin adsorption on the DLC:Si film surface, because a more hydrophobic surface reduces its interaction with water molecules, allowing for more direct contact with the protein.…”

Section: Contact Angle and Sfe Analysissupporting

confidence: 75%

Deposition, morphology and functional properties of layers based on DLC:Si and DLC:N on polyurethane

et al. 2020

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DLC:Si and DLC:N (diamond-like carbons doped with Si or N) functional layers in different configurations are deposited on polyurethane (PU) for bioengineering applications using CCP (capacitively coupled plasma) discharge generated in the PE CVD (plasma-enhanced chemical vapor deposition) system. Scanning electron microscopy (SEM) observations show that the obtained single and multilayers are continuous and well adherent to the substrates, but they differ in surface morphologies. DLC:Si layers form granular-like outer surfaces, while DLC:N ones a mosaic structure of plain areas. Topography analyses by atomic force microscopy (AFM) and optical profilometry reveal that Si-doped layers are characterized by significantly higher surface roughness (Ra ca. 5 nm) in comparison to N-doped layers (Ra ca. 0.3 nm) and also higher values of profile roughness parameter Rz (up to 32 μm vs. about 13 μm). Energy-dispersive X-ray spectroscopy (EDS) analysis indicates the homogenous chemical composition of the layers. DLC:N layers, are characterized by significantly higher polar component of surface free energy (up to ca. 5.0 mJ/m2). DLC:Si layers exhibit higher values of diiodomethane contact angle (up to ca. 90°) compared with DLC:N layers (up to ca. 55°). The attenuated total reflectance Fourier transform infrared spectroscopic measurements (ATR-FTIR) of the layers reveal that the addition of silicon to the DLC structure increases the content of terminal CHn bonds (n = 1, 2, 3) as well as beneficial Si–H and Si–CHn bonds, which significantly reduce the internal stresses in the layers. Both DLC:Si and DLC:N layers exhibit no cytotoxic effects using the human osteoblast-like cell line and human keratinocytes.

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“…The BSA molecule model is ellipsoidal with the dimensions of 4 nm × 4 nm × 14 nm 16 . According to the molecule feature, there are usually two kinds of models when the albumin monolayer is adsorbed to the material surface: side-on and end-on 17 . The thickness of the BSA-adsorbed layer showed in Fig.…”

Section: Discussionmentioning

confidence: 99%

Albumin adsorption on CoCrMo alloy surfaces

Yan

Yang

et al. 2015

Sci Rep

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Proteins can adsorb on the surface of artificial joints immediately after being implanted. Although research studying protein adsorption on medical material surfaces has been carried out, the mechanism of the proteins’ adsorption which affects the corrosion behaviour of such materials still lacks in situ observation at the micro level. The adsorption of bovine serum albumin (BSA) on CoCrMo alloy surfaces was studied in situ by AFM and SKPFM as a function of pH and the charge of CoCrMo alloy surfaces. Results showed that when the specimens were uncharged, hydrophobic interaction could govern the process of the adsorption rather than electrostatic interaction, and BSA molecules tended to adsorb on the surfaces forming a monolayer in the side-on model. Results also showed that adsorbed BSA molecules could promote the corrosion process for CoCrMo alloys. When the surface was positively charged, the electrostatic interaction played a leading role in the adsorption process. The maximum adsorption occurred at the isoelectric point (pH 4.7) of BSA.

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Characteristic of silicon doped diamond like carbon thin films on surface properties and human serum albumin adsorption

Cited by 27 publications

References 46 publications

Diamond Like Carbon Films Containing Si: Structure and Nonlinear Optical Properties

Diamond Like Carbon Films Containing Si: Structure and Nonlinear Optical Properties

Deposition, morphology and functional properties of layers based on DLC:Si and DLC:N on polyurethane

Albumin adsorption on CoCrMo alloy surfaces

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