Comparison between FTIR and XPS characterization of amino acid glycine adsorption onto diamond-like carbon (DLC) and silicon doped DLC

Ahmed, Mukhtar H.; Byrne, John; McLaughlin, James; Elhissi, Ama; Ahmed, Waqar

doi:10.1016/j.apsusc.2013.02.070

Cited by 128 publications

(47 citation statements)

References 48 publications

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“…[32]. The results agree with our previous experiments, suggested that the adsorption of glycine on to Si-DLC accrued through carboxylic acid group [12].…”

Section: Raman Spectroscopysupporting

confidence: 83%

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

Ahmed

Byrne

Ahmed

2015

Diamond and Related Materials

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Diamond-like carbon (DLC) coatings are useful for creating biocompatible surfaces for medical implants. DLC and silicon doped DLC have been synthesised using plasma enhanced chemical vapour deposition (PECVD). The effects of surface morphology on the interaction of human serum albumin (HSA) with doped and undoped DLC films have been investigated using a range of surface analysis techniques using Raman spectroscopy and atomic force microscopy (AFM). Raman spectra of doped DLC show that silicon doped DLC reduces the growth range of the ID/IG ratio, with a significant red-shift of the G peak position. Following exposure to protein, for undoped DLC the peaks at 1664 cm- 1 and around 1241 cm- 1 can be attributed to amide I and III, respectively, with an increase in the surface morphology of the surfaces giving some indication of the protein structure on the surfaces. Results indicate that HSA exhibit the majority of Î²-sheet during the adsorption on the surfaces. The results showed that the silicon incorporation DLC tends to increase of surface roughness and the adsorbed level of HSA is higher with higher levels of silicon doping of the DLC. Therefore, doping DLC may provide a method of controlling the adsorption of protein. Â© 2015 Elsevier B.V. All rights reserved

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“…[32]. The results agree with our previous experiments, suggested that the adsorption of glycine on to Si-DLC accrued through carboxylic acid group [12].…”

Section: Raman Spectroscopysupporting

confidence: 83%

“…The G-peak is due to bond stretching of all pairs of sp 2 configuration atoms in both rings and chains whilst the Dpeak is the shoulder of the G-peak at lower wave numbers due to the presence of the sp 2 aromatic rings [20]. This is due to the sp 2 domains in Si-DLC films decreasing [12].…”

Section: Raman Spectroscopymentioning

confidence: 99%

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

Ahmed

Byrne

Ahmed

2015

Diamond and Related Materials

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“…8c) [48,49]. Because of the low oxygen content formed on the wood surface from air contamination (Table II), (C-O) bonds were not detected by the spectral fit (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Creation of superhydrophobic wood surfaces by plasma etching and thin-film deposition

Xie

Tang

et al. 2015

Surface and Coatings Technology

104

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“…This diagram shows the fraction of carbon sites that have sp 2 (graphite-like) bonding, sp 3 (diamond-like) bonding or bonding with hydrogen. Quantitative analysis of sp 2 and sp 3 bonding in a DLC can be performed by XPS analysis [25,26]. In the present study, the DLC-1 had a higher sp 2 /sp 3 ratio (0.343) at the external surface region (ca.…”

Section: Discussionmentioning

confidence: 72%

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

et al. 2018

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Abstract:This study investigated a diamond-like carbon (DLC) coating formed on stainless steels (disk and wire specimens) using a plasma-based ion implantation/deposition method with two different parameters (DLC-1, DLC-2). These specimens were characterized using high-resolution elastic recoil analysis, microscale X-ray photoelectron spectroscopy and nanoindentation testing to determine the hydrogen content, sp 2 /sp 3 ratio and mechanical properties of the coating. Three-point bending and frictional properties were estimated. DLC-1 had a diamond-rich structure at the external surface and a graphite-rich structure at the inner surface, while DLC-2 had a graphite-rich structure at the external surface and a diamond-rich structure at the inner surface. Mean mechanical property values obtained for the external surface were lower than those for the inner surface in both types of DLC-coated specimens. The hydrogen content of DLC-2 was slightly higher versus DLC-1. Both DLC-coated wires produced a significantly higher elastic modulus according to the three-point bending test versus the non-coated wire. DLC-2 produced significantly lower frictional force than the non-coated specimen in the drawing-friction test. The coating of DLC-1 was partially ruptured by the three-point bending and drawing-friction tests. In conclusion, the bending and frictional performance of DLC-coated wire were influenced by the hydrogen content and sp 2 /sp 3 ratio of the coating.

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Comparison between FTIR and XPS characterization of amino acid glycine adsorption onto diamond-like carbon (DLC) and silicon doped DLC

Cited by 128 publications

References 48 publications

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

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

Creation of superhydrophobic wood surfaces by plasma etching and thin-film deposition

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

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