Thermal stability of germanium-carbon coatings prepared by a RF plasma enhanced chemical vapor deposition method

Sousani, F.; Jamali, Hossein; Mozafarinia, Reza; Eshaghi, Akbar

doi:10.1016/j.infrared.2018.08.006

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…Ge, D, and G peaks of the synthesized composite structure were recorded at 283.76 cm −1 , 1354 cm −1 , 1564 cm −1 , respectively. As can be seen from the related spectra (Figure 2), the obtained peaks for the Ge–DLC nanocomposite were consistent and within the characteristic peak range reported in the literature 18,38,39 …”

Section: Resultssupporting

confidence: 88%

“…Ge, D, and G peaks of the synthesized composite structure were recorded at 283.76 cm À1 , 1354 cm À1 , 1564 cm À1 , respectively. As can be seen from the related spectra (Figure2), the obtained peaks for the Ge-DLC nanocomposite were consistent and within the characteristic peak range reported in the literature 18,38,39. F I G U R E 2 Raman spectra of Ge-DLC nanocompositeF I G U R E 3 MTT cell viability analyses of DLC-Ge coated and uncoated borosilicate ((+) control) glass.…”

supporting

confidence: 85%

“…Ge–DLC film has shown to have superior mechanical features such as high durability, low stress, low absorption and high hardness compared to pure DLC coatings. Also, germanium–carbon coatings have been claimed to be produced via the use of pulsed laser deposition (PLD) easily at room temperature 17,18 …”

Section: Introductionmentioning

confidence: 99%

“…Also, germanium-carbon coatings have been claimed to be produced via the use of pulsed laser deposition (PLD) easily at room temperature. 17,18 Germanium (Ge) is a metalloid mostly used in the electronics industry and is known for its chemically similarity to silicon (Si). While this material is potentially often used for sensors, optics and catalysis, it can also be used as antibacterial agents.…”

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confidence: 99%

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Structural, biocompatibility, and antibacterial properties of Ge–DLC nanocomposite for biomedical applications

et al. 2022

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Integrative production of new nanocomposites has been used to enhance favorable features of biomaterials for unlocking ultimate potential of different molecules. In the present study, advantageous properties of diamond like carbons (DLC) and germanium (Ge) like greater biocompatibility and antibacterial attributes were aimed to combined into a thin film. For this purpose, 400 nm DLC–Ge nanocomposite was coated on the borosilicate glasses via the magnetron sputtering and surface characteristics was analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and The Raman spectrum. Biocompatibility analysis were performed by 3‐(4,5‐Dimethylthiazol‐2‐yl) (MTT) cell viability assay and Hoechst 33258 fluorescent staining genotoxicity assessments on the human fibroblast cell line (HDFa). Finally, antibacterial properties of DLC–Ge nanocomposite coatings were investigated by Pseudomonas aeruginosa (ATCC 27853) and Staphylococcus aureus (ATCC 25923) bacterial attachment analysis. As a result of magnetron sputtering coating, nearly 400 nm thick DLC–Ge nanocomposite film showed a smooth, a non‐porous, and a dense characteristic. Cell viability analysis showed that Ge–DLC coatings permits %95 cell surface growth of fibroblast cells. Also, there were no significant difference in aspect of nuclear abnormalities compared to the (−) control which showed nonmutagenic features of the thin film. Finally, antibacterial attachment analysis put forth that Ge–DLC coatings inhibits bacterial adhesion as %40 and %25 rates for P. aeruginosa and S. aureus bacterial strains, respectively. From these results, DLC–Ge nanocomposites could be proposed as a potential new biomaterial for various biomedical applications.

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Section: Resultssupporting

confidence: 88%

supporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Structural, biocompatibility, and antibacterial properties of Ge–DLC nanocomposite for biomedical applications

et al. 2022

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“…Among the modifications, germanium (Ge)-based DLCs and alloys have received growing interest in studies relating to biomedical application due to their improved physicochemical properties [9,10,11,12,13]. For instance, a recent study showed that Ge-DLC films had better mechanical properties (high hardness, high durability, low stress, low absorption, broad band infrared (IR) transparency, variable refraction index from 1.7 to 4) and good adhesion to many IR substrates compared with pure DLC films [14]. Furthermore, germanium carbide (GeC) thin films were shown to be easily fabricated by pulsed laser deposition (PLD) at room temperature [15].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study of Ge-DLC Nanocomposite Biomaterials Prepared by Laser Codeposition

et al. 2019

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This paper deals with the synthesis and study of the properties of germanium-doped diamond-like carbon (DLC) films. For deposition of doped DLC films, hybrid laser technology was used. Using two deposition lasers, it was possible to arrange the dopant concentrations by varying the laser repetition rate. Doped films of Ge concentrations from 0 at.% to 12 at.% were prepared on Si (100) and fused silica (FS) substrates at room temperature. Film properties, such as growth rate, roughness, scanning electron microscopy (SEM) morphology, wavelength dependent X-ray spectroscopy (WDS) composition, VIS-near infrared (IR) transmittance, and biological properties (cytotoxicity, effects on cellular morphology, and ability to produce reactive oxygen species (ROS)) were studied in relation to codeposition conditions and dopant concentrations. The analysis showed that Ge-DLC films exhibit cytotoxicity for higher Ge doping.

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Influence of film thickness on structural, optical, and electrical properties of sputtered nickel oxide thin films

Rezaee,

Korpi,

Karimi

et al. 2024

Microscopy Res & Technique

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Utilizing radio frequency magnetron sputtering, we successfully fabricated nickel oxide thin films with different thickness (from 80 to 270 nm), and conducted an in‐depth examination of their structural, morphological, optical, and electrical properties. The crystal structure and surface roughness were determined using x‐ray diffraction (XRD) and atomic force microscopy (AFM), respectively. The XRD analyses showed that the films were composed of cubic nickel oxide, exhibiting a notable orientation along the (200) direction. This crystal texture partially increased when the film thickness reached 270 nm. In addition, a direct correlation between film thickness and crystallite size was observed, with the latter increasing as the former did. AFM analysis provided insights into the surface morphology, revealing metrics like the bearing area, 3D surfaces intersections, and statistical properties of surface height. These insights underscore the relationship between film thickness and surface properties, which in turn influence the overall electrical, and prominently, optical properties of the films. Employing transmittance UV–visible spectroscopy, we characterized the optical behavior of these films, noting a proportional increase in refractive index with film thickness. Additionally, resistivity was observed to increase concomitantly with film thickness. In conclusion, the deposition process's film thickness acts as a pivotal parameter for fine‐tuning the structural, morphological, and optical properties of nickel oxide thin films. This knowledge paves the way for optimizing nickel oxide‐based devices across various applications.Research Highlights We synthesized and characterized of p‐type semiconducting NiO thin films sputtered on substrates by using RF magnetron sputtering with different thickness. Advanced crystalline structures and fractal features extracted from XRD and AFM analysis. The 2D and 3D surface analysis of the samples indicates a complex structure with an imperfect self‐similarity that suggests a multifractal structure. We represented graphically the relative representation of higher geometric objects in the AFM image. We attributed the optical and electrical properties of the samples to the crystallite size, and the concurrent reduction in oxygen vacancies and crystalline defects within the films.

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Thermal stability of germanium-carbon coatings prepared by a RF plasma enhanced chemical vapor deposition method

Cited by 6 publications

References 24 publications

Structural, biocompatibility, and antibacterial properties of Ge–DLC nanocomposite for biomedical applications

Structural, biocompatibility, and antibacterial properties of Ge–DLC nanocomposite for biomedical applications

Preliminary Study of Ge-DLC Nanocomposite Biomaterials Prepared by Laser Codeposition

Influence of film thickness on structural, optical, and electrical properties of sputtered nickel oxide thin films

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