Classification of DLC films in terms of biological response

Ohgoe, Yasuharu; Hirakuri, Kenji; Saitoh, Hidetoshi; Nakahigashi, Takahiro; Ohtake, Naoto; Hirata, Atsushi; Kanda, Kazuhiro; Hiratsuka, Masanori; Fukui, Yasuhiro

doi:10.1016/j.surfcoat.2012.07.018

Cited by 39 publications

(27 citation statements)

References 19 publications

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“…A higher amount of C-C sp 3 bonds would result in higher density and hardness (16) . When the hydrogen content increases by changing the source gas from benzene to cyclohexane, the C-C bonded sp 3 structure is thought to yield to C-H bonded sp 3 structure (17) . Since the refractive index measurements also decrease with the hardness and density from sample 2 to sample 4, the refractive index n is thought to be indicative of the C-C bonded sp 3 content, whereas visible raman spectroscopy can only distinguish the overall sp 3 content.…”

Section: Analysis Results Of Dlc Films Using the Ionized Evaporation mentioning

confidence: 99%

“…Table 2 The analysis results of DLC samples prepared by the ionized evaporation method Table 2 shows the analysis results of DLC samples prepared by the ionized evaporation method. XRR results showed that the density of the DLC coating using the ionized evaporation method was from 2.09 to 2.30 g/cm 3 . The HFS analysis results showed that the hydrogen content of the DLC films were from 20.5 to 25 atomic %.…”

Section: Preparation Of Dlc Films Using Different Types Of Depositionmentioning

confidence: 99%

“…Diamond-like carbon (DLC) films have an amorphous structure, containing both sp 2 and sp 3 bonded carbon, and some types of DLC also contain hydrogen (1) . DLC films are used nowadays in various applications such as a protective coating against wear or corrosion, in automotive parts and recently its use is more and more apparent in particular biomedical applications (2) (3) . J. Robertson proposed a ternary phase diagram based on sp 2 , sp 3 and hydrogen content to classify types of DLC (1) .…”

Section: Introductionmentioning

confidence: 99%

“…DLC films are used nowadays in various applications such as a protective coating against wear or corrosion, in automotive parts and recently its use is more and more apparent in particular biomedical applications (2) (3) . J. Robertson proposed a ternary phase diagram based on sp 2 , sp 3 and hydrogen content to classify types of DLC (1) . Recently, DLC is divided into types, and each type is used separately according to its appropriate application.…”

Section: Introductionmentioning

confidence: 99%

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Correlation between Optical Properties and Hardness of Diamond-Like Carbon Films

Hiratsuka

Nakamori

Kogo

et al. 2013

JMMP

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For this study, four kinds of DLC films were prepared using the ionized evaporation method. The substrate voltage was controlled, from 1 to 3 kV. Three kinds of films were prepared with benzene, and one with cyclohexane as the source gas. The DLC structure could be controlled using these parameters. This is related to hardness and optical properties. Various types of DLC films, which were used in round-robin testing for standardization were also analyzed in this study. These DLC films were deposited on Si substrates using the ionized evaporation method, the sputtering method, the arc method, and the plasma CVD method. The hardness of DLC films was determined using the nano-indentation technique. The refractive index and the extinction coefficient of DLC films were evaluated using a spectroscopic ellipsometer. The refractive index of tetrahedral amorphous carbon (ta-C) was found to be relatively high, from 2.50 to 2.74, whereas the extinction coefficient was low, from 0.04 to 0.50. For hydrogenated tetrahedral amorphous carbon (ta-C:H), the refractive index was lower than ta-C. Hydrogenated amorphous carbon (a-C:H) showed its own unique extinction coefficient and refractive index range, as did amorphous carbon (a-C). The refractive index was found to be proportional to the hardness of DLC films. The refractive index and the extinction coefficient were different depending on the kind of DLC, which were in turn related to the deposition method and DLC structure. Using optical properties, such as the refractive index and the extinction coefficient, we can distinguish the type of DLC film.

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Section: Analysis Results Of Dlc Films Using the Ionized Evaporation mentioning

confidence: 99%

Section: Preparation Of Dlc Films Using Different Types Of Depositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlation between Optical Properties and Hardness of Diamond-Like Carbon Films

Hiratsuka

Nakamori

Kogo

et al. 2013

JMMP

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“…The properties of such coatings are directly related to the hybridization state of carbon bonds and the hydrogen content. The combination of chemical inertness, low friction coefficient, high hardness, and good wear resistance make DLC films very suitable for a wide variety of biomedical [2][3][4][5][6][7][8][9], mechanical [10][11][12][13] and tribological applications [14][15][16][17][18][19][20]. However, the high compressive stress, which limits the thickness of coatings, represents a main disadvantage of DLC coatings.…”

Section: Introductionmentioning

confidence: 99%

Structure, Mechanical and Tribological Properties of Me-Doped Diamond-Like Carbon (DLC) (Me = Al, Ti, or Nb) Hydrogenated Amorphous Carbon Coatings

2018

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Metal containing hydrogenated diamond-like carbon coatings (Me-DLC, Me = Al, Ti, or Nb) of 3 ± 0.2 μm thickness were deposited by a magnetron sputtering-RFPECVD hybrid process in an Ar/H2/C2H2 mixture. The composition and structure were investigated by Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The residual stress was measured using the curvature method and nanoindentation was used to determine the hardness and the Young’s modulus. A Ball-on-disk tribometer was employed to investigate the frictional properties and sliding wear resistance of films. The results show that the properties depend on the nature and the Me content in the coatings. The doping of the DLC coatings leads to a decrease in hardness, Young’s modulus, and residual stresses. Wear rate of the films first decreases with intermediate Me contents and then increases for higher Me contents. Significant improvements in the friction coefficient on steel as well as in the wear rate are observed for all Al-DLC coatings, and, concerning the friction coefficient, the lowest value is measured at 0.04 as compared to 0.07 for the undoped DLC.

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Bioceramic Coatings for Medical Implants

Cabañas

2014

Bio‐Ceramics With Clinical Applications

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Classification of DLC films in terms of biological response

Cited by 39 publications

References 19 publications

Correlation between Optical Properties and Hardness of Diamond-Like Carbon Films

Correlation between Optical Properties and Hardness of Diamond-Like Carbon Films

Structure, Mechanical and Tribological Properties of Me-Doped Diamond-Like Carbon (DLC) (Me = Al, Ti, or Nb) Hydrogenated Amorphous Carbon Coatings

Bioceramic Coatings for Medical Implants

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