A NEXAFS characterization of ion-beam-assisted carbon-sputtered thin films

Jaouen, M.; Tourillon, G.; Delafond, J.; Junqua, N.; Hug, G.

doi:10.1016/0925-9635(94)00252-5

Cited by 55 publications

(44 citation statements)

References 26 publications

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“…The greatest uncertainty regarding peak assignment resides with the peak near 289.1 eV. According to Jaouen et al [19], this peak could be attributed to occurrence of (O=C-OH). An experiment was then carried out to verify whether this is a plausible assignment for the films prepared by FCA.…”

Section: Resultsmentioning

confidence: 99%

“…Several absorption peaks around the C-K 1s edge have been identified [17][18][19][20]. Table I summarizes reported transitions and corresponding energies.…”

Section: Resultsmentioning

confidence: 99%

“…Plowing of the substrate can also explain the dependence of the COF on the Si content for high loads. [17][18][19] 286.8 1s → π * of sp 2 (C=O) [17,19] 287.8 1s → σ * of sp 3 (C-H) [17,19] 288.5 1s → π * (O=C-OH) [19] 288.8 Excitonic process (like in diamond) [18] 289 Resonance 1s → σ * of sp 3 (C-C) [17,20] 290 -310 1s → σ * of sp 3 (C-C) broadened because it is amorphous …”

Section: Discussionmentioning

confidence: 99%

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Investigation of non-hydrogenated DLC:Si prepared by cathodic arc

Monteiro¹,

Delplancke‐Ogletree²

2003

Surface and Coatings Technology

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Abstract:Non-hydrogenated DLC films (also referred as ta-C) have been extensively studied and are used for a variety of wear related applications. Alloying DLC with refractory metals and other elements have been shown to be promising techniques to overcome some of the problems associated with pure DLC, such as excessive level of intrinsic stresses and high-temperature stability. The microstructure of DLC:Me in general consists of crystalline metal carbides dispersed in a DLC matrix. In contrary, DLC:Si has an amorphous structure. We have used filtered cathodic arc to prepare DLC:Si up to 6% Si, and have characterized their structure and bonding using microscopy (TEM) and spectroscopy (XPS, NEXAFS). The effect of Si in changing the bonding configuration of the C network is discussed. The microstructure is then correlated to hardness and friction measured by nano-indentation and micro-wear.

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Section: Resultsmentioning

confidence: 99%

“…Several absorption peaks around the C-K 1s edge have been identified [17][18][19][20]. Table I summarizes reported transitions and corresponding energies.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Investigation of non-hydrogenated DLC:Si prepared by cathodic arc

Monteiro¹,

Delplancke‐Ogletree²

2003

Surface and Coatings Technology

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“…These features are common to materials with a high fraction of ordered sp 3 -bonded carbon, i.e., diamond [21]. There is also a feature at *286.7 eV from C=O bonds [22,23]. The double peak around 292.0 eV is more intense than typical UNCD spectra, and looks like the r* post-edge features from a highly oriented pyrolitic graphite (HOPG) spectrum [20].…”

Section: Resultsmentioning

confidence: 92%

Near-Edge X-ray Absorption Fine Structure Imaging of Spherical and Flat Counterfaces of Ultrananocrystalline Diamond Tribological Contacts: A Correlation of Surface Chemistry and Friction

et al. 2011

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A recently installed synchrotron radiation nearedge X-ray absorption fine structure (NEXAFS) full field imaging electron spectrometer was used to spatially resolve the chemical changes of both counterfaces from an ultrananocrystalline diamond (UNCD) tribological contact. A silicon flat and Si 3 N 4 sphere were both coated with UNCD, and employed to form two wear tracks on the flat in a linear reciprocating tribometer. The first wear track was produced using a new, unconditioned sphere whose surface was thus conditioned during this first experiment. This led to faster run-in and lower friction when producing a second wear track using the conditioned sphere. The large depth of field of the magnetically guided NEXAFS imaging detector enabled rapid, large area spectromicroscopic imaging of both the spherical and flat surfaces. Laterally resolved NEXAFS data from the tribological contact area revealed that both substrates had an as-grown surface layer that contained a higher fraction of sp 2 -bonded carbon and oxygen which was mechanically removed. Unlike the flat, the film on the sphere showed evidence of having graphitic character, both before and after sliding. These results show that the graphitic character of the sphere is not solely responsible for low friction and short run-in. Rather, conditioning the sphere, likely by removing asperities and passivating dangling bonds, leads to lower friction with less chemical modification of the substrate in subsequent tests. The new NEXAFS imaging spectroscopy detector enabled a more complete understanding of the tribological phenomena by imaging, for the first time, the surface chemistry of the spherical counterface which had been in continual contact during wear track formation.

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“…The ratio of sp 3 % to sp 2 % can affect the physical properties of diamond-like (amorphous) carbon films. The multiGaussian curve fitting method is generally used to analyze the spectra of diamond-like carbon (DLC) generated by such methods as: near-edge X-ray absorption fine structure (NEXAFS), 1) infrared (IR) absorption, 2,3) X-ray photoelectron spectroscopy (XPS), [4][5][6] and visible Raman spectroscopy. 3,4,[6][7][8][9][10][11][12][13][14][15][16][17] Visible Raman spectroscopy is applied to the structural characterization of DLC films as a speedy and less destructive technique.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Trends Resulting from the Use of a Multi-Gaussian Curve Fitting Method Applied to the Visible Raman Spectra of Sputtered Amorphous Carbon

Shen

Chou

2011

Mater. Trans.

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This paper discusses the application of a direct integral area method and a multi-Gaussian curve fitting method to the interpretation of visible Raman spectra. A data analysis study was performed on three amorphous carbon films prepared by magnetron sputtering. Application of XPS, AES and the direct integration of the areas under the curves generated by visible Raman spectra, gave results that represented the diamondlike qualities of three amorphous carbon films in a similar manner, but the representation of data-trends using the multi-Gaussian curve fitting method was irregular. More specifically, we discovered that both the number of Gaussian curves applied, and the analytic regions chosen for analyzing the spectra affected the interpretation of the data obtained; our results indicate that the multi-Gaussian curve fitting method may give rise to inconsistent results when applied to the analysis of the visible Raman spectra of diamond-like (amorphous) carbon films.

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A NEXAFS characterization of ion-beam-assisted carbon-sputtered thin films

Cited by 55 publications

References 26 publications

Investigation of non-hydrogenated DLC:Si prepared by cathodic arc

Investigation of non-hydrogenated DLC:Si prepared by cathodic arc

Near-Edge X-ray Absorption Fine Structure Imaging of Spherical and Flat Counterfaces of Ultrananocrystalline Diamond Tribological Contacts: A Correlation of Surface Chemistry and Friction

Comparative Analysis of Trends Resulting from the Use of a Multi-Gaussian Curve Fitting Method Applied to the Visible Raman Spectra of Sputtered Amorphous Carbon

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