Determination of the sp3/sp2 ratio of a-C:H by XPS and XAES

Leung, T. Y. B.; Man, Wenkuan; Lim, P. K.; Chan, Wai-Yip; Gaspari, F.; Żukotyński, S.

doi:10.1016/s0022-3093(99)00388-9

Cited by 192 publications

(123 citation statements)

References 14 publications

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“…The peaks at 284.6 eV and 285.4 eV are assigned to the C-C bond in sp 2 and sp 3 configuration. These observations are consistent with those reported elsewhere [21,22]. The sp 2 to sp 3 ratio of ta-C films can be determined from the relative intensities of the curve fitted XPS C 1s spectra.…”

Section: Resultssupporting

confidence: 92%

Ion Beam Induced Darkening in Tetrahedral Amorphous Carbon Thin Films

2015

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The samples of thin film (d ≈ 40 nm) tetrahedral amorphous carbon (ta-C), deposited by the filtered cathodic vacuum arc have been implanted with N + at a fluence of 3 × 10 14 cm −2 and ion energy E = 20 keV. The induced structural modification of the implanted material results in a considerable change of its optical properties, best manifested by a significant shift of the optical absorption edge to lower photon energies as obtained from optical transmission measurements. This shift is accompanied by a considerable increase of the absorption coefficient (photodarkening effect) in the measured wavelength range (350÷2500 nm). These effects could be attributed to both the additional defect introduction and the increased graphitization, as confirmed by the X-ray photoelectron spectroscopy measurements. The optical contrast thus obtained (between implanted and unimplanted film materials) could be made use of in the area of high-density optical data storage using the focused ion beams.

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Section: Resultssupporting

confidence: 92%

Ion Beam Induced Darkening in Tetrahedral Amorphous Carbon Thin Films

2015

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“…The beneficial properties of DLC in tribology depend mainly on the similar hardness and Young's modulus as diamonds [28,40]. Besides, C-O and -COO signals were also found and are attributed to the surface oxidation during the coating process and storage [41] and is in good agreement with the results obtained in [42]. In pure MoS 2 coatings, the high nitrogen and carbon amounts are attributed to atmospheric contaminations (CO 2 , hydrocarbons, N 2 , etc.)…”

Section: Chemical Compositionsupporting

confidence: 84%

The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials

et al. 2018

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Abstract:The potential of the combination of hard and soft coating on elastomers was investigated. Diamond-like carbon (DLC), molybdenum disulfide (MoS 2 ) and composite coatings of these two materials with various DLC/MoS 2 ratios were deposited on four elastomeric substrates by means of the magnetron sputtering method. The microstructures, surface energy of the coatings, and substrates were characterized by scanning electron microscopy (SEM) and contact angle, respectively. The chemical composition was identified by X-ray Photoelectron Spectroscopy (XPS). A ball on disc configuration was used as the model test, which was performed under dry and lubricated conditions. Based on the results from the model tests, the best coating was selected for each substrate and subsequently verified in component-like test. There is not one coating that is optimal for all substrates. Many factors can affect the coatings performance. The topography and the rigidity of the substrates are the key factors. However, the adhesion between coatings and substrates, and also the coating processes, can impact significantly on the coatings performance.

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“…Table 1 summarizes the XPS C1s spectra deconvolution of carbon films, including amorphous carbon film (a-C), a-C:H (DLCH) and a-C:H:X (doping cases), the different curve fitting methods using 80% up to 100% Gaussian functions consist of two, three or four deconvoluted peaks in order to quantitatively evaluate the sp 2 /sp 3 ratio. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] Diez et al have mentioned that the Gaussian function could be used to account for the instrumental energy resolution and chemical disorder, and the Lorentzian function could be used to measure the life time of photoionzation process. 15) 3.…”

Section: Methodsmentioning

confidence: 99%

Correlation between ID&frasl;IG Ratio from Visible Raman Spectra and sp2/sp3 Ratio from XPS Spectra of Annealed Hydrogenated DLC Film

et al. 2006

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The hydrogened diamond like carbon film (DLCH) with 1 mm thickness is made by hydrocarbon gas ion beam deposition method. The relationship between I D =I G ratio fitted from visible Raman spectra and sp 2 /sp 3 ratio done from XPS spectra of DLCH film shows a trend. The I D =I G ratio of deconvoluted visible Raman spectra shows a correlation with sp 2 /sp 3 ratio from XPS spectra as annealing temperature increases, the graphitization and the disorder increase. The I D =I G ratios fitted with two-curve Gaussian functions of Raman spectra tend to be proportional to sp 2 /sp 3 ratio fitted with three-curve with 100% Gaussian function of XPS spectra when post annealed treatment is below 400 C and without severe oxidation.

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Determination of the sp3/sp2 ratio of a-C:H by XPS and XAES

Cited by 192 publications

References 14 publications

Ion Beam Induced Darkening in Tetrahedral Amorphous Carbon Thin Films

Ion Beam Induced Darkening in Tetrahedral Amorphous Carbon Thin Films

The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials

Correlation between <I>I</I><SUB>D</SUB>&frasl;<I>I</I><SUB>G</SUB> Ratio from Visible Raman Spectra and sp<SUP>2</SUP>/sp<SUP>3</SUP> Ratio from XPS Spectra of Annealed Hydrogenated DLC Film

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