Si doping enhances the thermal stability of diamond-like carbon through reductions in carbon-carbon bond length disorder

Hilbert, James; Mangolini, Filippo; McClimon, J. Brandon; Lukes, Jennifer R.; Carpick, Robert W.

doi:10.1016/j.carbon.2018.01.081

Cited by 70 publications

(31 citation statements)

References 34 publications

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“…Liu et al [13] investigated the velocity dependence of superlubricity stability in a wide range of 3−70 cm•s -1 and found that the failure of superlubricity at high sliding velocity was due to the absence of tribolayer on contact surface rather than the flashing heat effect or the destruction of hydrogen passivation. Experimental and theoretical calculation results verified the decisive roles of fluorine and silicon in stabilizing the bonding network of the bulk film and the as-formed tribolayer by forming F-C and Si-C bonds [14,15]. For adhesive tribocouple of DLC against alumina, a volcano-type temperature dependence (300−1,000 K) of friction was clarified from the viewpoint of tribochemical reactions [16].…”

Section: Solid Superlubricity 2211 Superlubricity Of Diamond-like mentioning

confidence: 85%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Section: Solid Superlubricity 2211 Superlubricity Of Diamond-like mentioning

confidence: 85%

A review of recent advances in tribology

et al. 2020

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“…Experimental and computational studies have revealed the existence of a threshold temperature in the range of 200–350 °C above which a -C films undergo significant structural changes 20 – 22 . Increasing the sp 3 fraction and doping with certain elements, such as silicon, have been proven effective methods for enhancing the thermal stability of a -C films by stabilizing the carbon atoms in the sp 3 hybridization state and inhibiting sp 3 -to- sp 2 rehybridization at high temperatures 23 – 25 . The significant effect of environmental conditions (e.g., humidity) on the tribological properties of a -C films 26 , 27 prompted experimental studies in vacuum and various atmospheres, including ambient and dry air, or pure gas, such as hydrogen, nitrogen, and carbon dioxide 28 , 29 .…”

Section: Introductionmentioning

confidence: 99%

A molecular dynamics study of the oxidation mechanism, nanostructure evolution, and friction characteristics of ultrathin amorphous carbon films in vacuum and oxygen atmosphere

Wang

Komvopoulos

2021

Sci Rep

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Amorphous carbon (a-C) films are characterized by extraordinary chemical inertness and unique thermophysical properties that are critical to applications requiring oxidation-resistant, low-friction, and durable overcoats. However, the increasing demands for ultrathin (a few nanometers thick) a-C films in various emerging technologies, such as computer storage devices, microelectronics, microdynamic systems, and photonics, make experimental evaluation of the structural stability and tribomechanical properties at the atomic level cumbersome and expensive. Consequently, the central objective of this study was to develop comprehensive MD models that can provide insight into the oxidation behavior and friction characteristics of ultrathin a-C films exhibiting layered through-thickness structure. MD simulations were performed for a-C films characterized by relatively low and high sp3 contents subjected to energetic oxygen atom bombardment or undergoing normal and sliding contact against each other in vacuum and oxygen atmosphere. The effect of energetic oxygen atoms on the oxidation behavior of a-C films, the dependence of contact deformation and surface attractive forces (adhesion) on surface interference, and the evolution of friction and structural changes (rehybridization) in the former a-C films during sliding are interpreted in the context of simulations performed in vacuum and oxidizing environments. The present study provides insight into the oxidation mechanism and friction behavior of ultrathin a-C films and introduces a computational framework for performing oxidation/tribo-oxidation MD simulations that can guide experimental investigations.

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“…The crucial parameters are the sp 3 content, clustering and orientation of the sp 2 phase, cross-sectional nanostructures, and hydrogen content [6]. High internal stress occurs in DLC coatings because of the large fraction of highly tensile-strained sp 3 C-C bonds [7]. It is accepted that the sp 3 bond network affects the thermal stability and mechanical properties (hardness, Young's modulus) of DLC and ta-C coatings [6,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…A significant fraction of C-Si bonds forms within the a-C:H matrix, which inhibits the formation of strained C-C bonds. This reduces the probability of sp 3 to sp 2 transformation, resulting in higher thermal stability [7]. Further improvements in the thermal stability and tribological properties have been achieved by doping a:C:H with both silicon and oxygen to form an a-C:H:Si:O structure [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Tribological Performance of Al2O3/a-C:H:Si Coating in Ambient Air

et al. 2021

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The study investigates thermal stability and high temperature tribological performance of a-C:H:Si diamond-like carbon (DLC) coating. A thin alumina layer was deposited on top of the a-C:H:Si coating to improve the tribological performance at high temperatures. The a-C:H:Si coating and alumina layer were prepared using plasma-activated chemical vapour deposition and atomic layer deposition, respectively. Raman and X-ray photoelectron spectroscopy were used to investigate the structures and chemical compositions of the specimens. The D and G Raman peaks due to sp2 bonding and the peaks corresponding to the trans-polyacetylene (t-Pa) and sp bonded chains were identified in the Raman spectra of the a-C:H:Si coating. Ball-on-disc sliding tests were carried out at room temperature and 400 °C using Si3N4 balls as counter bodies. The a-C:H:Si coating failed catastrophically in sliding tests at 400 °C; however, a repeatable and reproducible regime of sliding with a low coefficient of friction was observed for the Al2O3/a-C:H:Si coating at the same temperature. The presence of the alumina layer and high stress and temperature caused structural changes in the bulk a-C:H:Si and top layers located near the contact area, leading to the modification of the contact conditions, delivering of extra oxygen into the contact area, reduction of hydrogen effusion, and suppression of the atmospheric oxidation.

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Si doping enhances the thermal stability of diamond-like carbon through reductions in carbon-carbon bond length disorder

Cited by 70 publications

References 34 publications

A review of recent advances in tribology

A review of recent advances in tribology

A molecular dynamics study of the oxidation mechanism, nanostructure evolution, and friction characteristics of ultrathin amorphous carbon films in vacuum and oxygen atmosphere

High-Temperature Tribological Performance of Al2O3/a-C:H:Si Coating in Ambient Air

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