Structural order in near-frictionless hydrogenated diamondlike carbon films probed at three length scales via transmission electron microscopy

Liu, Amelia C. Y.; Arenal, Raúl; Miller, Dean J.; Chen, Xidong; Johnson, Jacqueline A.; Eryilmaz, O. L.; Erdemir, Ali; Woodford, John

doi:10.1103/physrevb.75.205402

Cited by 46 publications

(46 citation statements)

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“…1) is observed in the graphite spectrum but not in the diamond spectrum, the transitions to σ * states appearing at higher energy (around 292 eV) [48,56]. Beyond this qualitative description, the sp 2 fraction can also be determined from thorough analysis of the C-K edge [57][58][59][60]. However, the determination of the sp 2 fraction of carbon-based materials from core-loss EELS is not an easy task and two main pitfalls should be avoided.…”

Section: Introductionmentioning

confidence: 99%

Advanced spectroscopic analyses on a:C-H materials: Revisiting the EELS characterization and its coupling with multi-wavelength Raman spectroscopy

Lajaunie

Pardanaud

Martin

et al. 2017

Carbon

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Hydrogenated amorphous carbon thin films (a:C-H) are very promising materials for numerous applications. The growing of relevance of a:C-H is mainly due to the long-term stability of their outstanding properties. For improving their performances, a full understanding of their local chemistry is highly required. Fifteen years ago, electron energy-loss spectroscopy (EELS), developed in a transmission electron microscope (TEM), was the technique of choice to extract such kind of quantitative information on these materials. Other optical techniques, as Raman spectroscopy, are now clearly favored by the scientific community. However, they still lack of 2 the spatial resolution offered by TEM-EELS. In addition, nowadays, the complexity of the physics phenomena behind EELS is better known. Here, a:C-H thin films have been isothermally annealed and the evolution of their physical and chemical parameters have been monitored at the local and macroscopic scales. In particular, chemical in-depth inhomogeneities and their origins are highlighted. Furthermore, a novel procedure to extract properly and reliably quantitative chemical information from EEL spectra is presented. Finally, the pertinence of empirical models used by the Raman community is discussed. These works demonstrate the pertinence of the combination of local and macroscopic analyses for a proper study of such complex materials.

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Section: Introductionmentioning

confidence: 99%

Advanced spectroscopic analyses on a:C-H materials: Revisiting the EELS characterization and its coupling with multi-wavelength Raman spectroscopy

Lajaunie

Pardanaud

Martin

et al. 2017

Carbon

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“…The alcohol vaporphase lubrication (VPL) effect was studied for a stainless steel ball (SS440C grade) sliding against two types of DLC films-one is highly hydrogenated (atomic hydrogen content = *40%; previously noted as NFC-6) and the other mildly hydrogenated (atomic hydrogen content = *25%; noted as NFC-10) [16]. In an Ar environment containing npentanol vapor, it was observed that the wear and transfer film formation of the DLC surface is remarkably suppressed although the friction coefficient is not ultra-low (\0.05) but in the vicinity of *0.15.…”

Section: Introductionmentioning

confidence: 99%

Is Ultra-Low Friction Needed to Prevent Wear of Diamond-Like Carbon (DLC)? An Alcohol Vapor Lubrication Study for Stainless Steel/DLC Interface

et al. 2011

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The effects of n-pentanol vapor on friction and wear of hydrogenated diamond-like carbon (DLC) films during sliding against a 440C stainless steel (SS) ball were investigated with a reciprocating pin-on-disc tribometer. Under dry sliding conditions, the friction coefficient is initially high ([0.2) for a so-called run-in period and then gradually subsequently decreases to an ultra-low value (\0.025). During the run-in period, a carbon transfer film is formed on the SS ball side, which seems to be the key for the ultra-low friction behavior. In n-pentanol vapor environments, the friction coefficient remained nearly constant at *0.15 throughout the entire test cycles without any noticeable run-in period. Although the friction coefficient is high, there is no visible wear on rubbing surfaces when examined by optical microscopy, and the transfer film forming tendency on the SS ball side was much reduced. In humid environments, the wear prevention effect is not observed and transfer films do form on the ball side. These results imply that the n-pentanol layer adsorbed on DLC film from the vapor phase provides a molecularly thin lubrication layer which can prevent the substrate from wear.

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“…Raman spectroscopy has been applied extensively in this study by understanding ordered/disordered structures of carbonaceous materials [7,11,[13][14][15][16][17][18][19]. In order to look at the carbon coating structure change, a more recent research based on TEM/EELS study has been seen in some groups in order to measure the relative carbon sp 2 ratio before and after the tribometer tests [20]. Understanding about GMO and DLC interactions for ultralow friction was reported and explained by some XANES and SIMS chemical analysis.…”

Section: Introductionmentioning

confidence: 99%

Friction reduction mechanisms in boundary lubricated W-doped DLC coatings

Yang

Neville

Brown³

et al. 2014

Tribology International

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The applications of commercially available Diamond Like Carbon (DLC) coatings have seen a rapid increase whilst a lot of tribochemistry problems are not fully understood. This study looks into a tungsten doped hydrogenated DLC coating reciprocating against cast iron in model oils. Friction and wear of such system are then compared with steel. Raman spectroscopy is used extensively to understand the coating interactions with the lubricant/additives. Our results have demonstrated the way to characterize carbon coating structure in lubrication. It clarified the chemical decomposition of MoDTC to MoS 2 is the dominant process rather than the possible formation of WS 2 in such system. It also enbles application of in-situ tribochemical aspects using Raman spectroscopy in ambient conditions.

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Structural order in near-frictionless hydrogenated diamondlike carbon films probed at three length scales via transmission electron microscopy

Cited by 46 publications

References 50 publications

Advanced spectroscopic analyses on a:C-H materials: Revisiting the EELS characterization and its coupling with multi-wavelength Raman spectroscopy

Advanced spectroscopic analyses on a:C-H materials: Revisiting the EELS characterization and its coupling with multi-wavelength Raman spectroscopy

Is Ultra-Low Friction Needed to Prevent Wear of Diamond-Like Carbon (DLC)? An Alcohol Vapor Lubrication Study for Stainless Steel/DLC Interface

Friction reduction mechanisms in boundary lubricated W-doped DLC coatings

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