Structural alteration induced by substrate bias voltage variation in diamond-like carbon films fabricated by unbalanced magnetron sputtering

Nakamura, Morimasa; Takagawa, Yuka; Miura, Kenichiro; Kobata, Junpei; Zhu, Wenliang; Nishiike, Naomichi; Arao, Kazuyuki; Marin, Elia; Pezzotti, Giuseppe

doi:10.1016/j.diamond.2018.10.019

Cited by 37 publications

(12 citation statements)

References 33 publications

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“…In addition, a slightly noticeable peak was present around 850 cm −1 , which was due to trans-polyethyne [ 97 , 98 , 99 ]. The broad and slightly distinct peak in the region of high wavenumbers between 2700 cm −1 and 3200 cm −1 could be attributed to 2D and 2G bands, overlapped by symmetric and anti-symmetric stretching modes due to the hydrogen incorporation [ 100 ]. The ratios of the intensities of the D- and G-band ( I D / I G ) were calculated to be in the range of 0.2 and 0.3, which are also characteristic values for hydrogenated amorphous carbon coatings [ 99 , 101 ].…”

Section: Resultsmentioning

confidence: 99%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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Diamond-like carbon coatings may decrease implant wear, therefore, they are helping to reduce aseptic loosening and increase service life of total knee arthroplasties (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt-chromium-molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While the deposition of a pure (a-C:H) and tungsten-doped hydrogen-containing amorphous carbon coating (a-C:H:W) as well as the detailed characterization of mechanical and adhesion properties were the subject of Part I, the tribological behavior is studied in Part II. Pin-on-disk tests are performed under artificial synovial fluid lubrication. Numerical elastohydrodynamic lubrication modeling is used to show the representability of contact conditions for TKAs and to assess the influence of coatings on lubrication conditions. The wear behavior is characterized by means of light and laser scanning microscopy, Raman spectroscopy, scanning electron microscopy and particle analyses. Although the coating leads to an increase in friction due to the considerably higher roughness, especially the UHMWPE wear is significantly reduced up to a factor of 49% (CoCr) and 77% (Ti64). Thereby, the coating shows continuous wear and no sudden failure or spallation of larger wear particles. This demonstrated the great potential of amorphous carbon coatings for knee replacements.

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Section: Resultsmentioning

confidence: 99%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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“…A weakly pronounced peak around 850 cm −1 could also be observed, indicating trans-polyethyne [99][100][101]. Additionally, a broad and weak peak is visible between 2700 cm −1 and 3200 cm −1 [101] suggests a superposition of symmetric and antisymmetric stretching modes of hydrogen incorporation, such as CD x and CH x [98], due to 2D-and 2G-bands [102]. The intensity ratio of D-and G-band (I D /I G ) yielded the content of sp 2 hybridized carbon atoms, with a small value of the quotient describing a low sp 2 content and a higher sp 3 content, respectively [98].…”

Section: Chemical Properties and Cytological Interactionsmentioning

confidence: 91%

Amorphous Carbon Coatings for Total Knee Replacements—Part I: Deposition, Cytocompatibility, Chemical and Mechanical Properties

et al. 2021

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Diamond-like carbon (DLC) coatings have the potential to reduce implant wear and thus to contribute to avoiding premature failure and increase service life of total knee replacements (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt–chromium–molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While a detailed characterization of the tribological behavior is the subject of part II, part I focusses on the deposition of pure (a‑C:H) and tungsten-doped hydrogen-containing amorphous carbon coatings (a‑C:H:W) and the detailed characterization of their chemical, cytological, mechanical and adhesion behavior. The coatings are fabricated by physical vapor deposition (PVD) and display typical DLC morphology and composition, as verified by focused ion beam scanning electron microscopy and Raman spectroscopy. Their roughness is higher than that of the plain substrates. Initial screening with contact angle and surface tension as well as in vitro testing by indirect and direct application indicate favorable cytocompatibility. The DLC coatings feature excellent mechanical properties with a substantial enhancement of indentation hardness and elastic modulus ratios. The adhesion of the coatings as determined in modified scratch tests can be considered as sufficient for the use in TKAs.

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“…Figure shows the variations of the obtained C 1s XP spectra of the investigated carbon films. Spectral deconvolution was performed based on reported binding energies of carbon, , and the results are given in Table . As can be seen, the C 1s XP spectra of the two sets of annealed samples exhibit a somewhat similar spectral morphology, showing a strong but slightly asymmetric peak at around 284.5 eV.…”

Section: Resultsmentioning

confidence: 99%

Transfer-Free Layered Graphene on Silica via Segregation through a Nickel Film for Electronic Applications

Vaněk

Jati

Okada

et al. 2020

ACS Appl. Nano Mater.

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Transfer-free graphene growth via annealing-induced carbon segregation was investigated on a series of carbon/metal/silica layered samples prepared by sequential deposition of Ni from evaporation of Ni and amorphous carbon thin layers from carbon fiber threads on different silica substrates and further thermal treatments with different annealing times, in an attempt to clarify the evolution of carbon formation and its structural variation along with the segregation procedure. Raman and X-ray photoelectron spectroscopies were applied to analyze the microstructure and chemical composition of the generated graphene layer and the carbon microstructure in the depth direction of the metal layer with the aid of Ar-ion etching. The results revealed the annealing-time dependence of the generated graphene quality, possibly because of the competition between carbon diffusion and metal carbide formation/decomposition during annealing. Few-layer stacked graphene sheets with lower defect concentration and larger crystalline size could be grown with increasing annealing time (<1.5 h), while further extending the annealing time resulted in the pronounced formation of amorphous carbon. Similar results were obtained on different types of silica substrates, revealing that growth of graphene was conspicuously independent of the type of the silica substrate, despite a slight difference in the obtained graphene quality owing to a difference in the lattice microstructure and the surface defect. The in-depth understanding of the mechanism of graphitization helps further development of direct growth of high-quality graphene on insulating substrates for applications in electronic devices.

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Structural alteration induced by substrate bias voltage variation in diamond-like carbon films fabricated by unbalanced magnetron sputtering

Cited by 37 publications

References 33 publications

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part I: Deposition, Cytocompatibility, Chemical and Mechanical Properties

Transfer-Free Layered Graphene on Silica via Segregation through a Nickel Film for Electronic Applications

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