Enhanced lubricity of CVD diamond films by in-situ synthetization of top-layered graphene sheets

Ji, Zhe; Lin, Qiang; Huang, Zhewei; Chen, Sulin; Gong, Peng; Sun, Zhengzong; Shen, Bin

doi:10.1016/j.carbon.2021.08.077

Cited by 18 publications

(8 citation statements)

References 44 publications

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“…The typical Raman spectra of the MCD and NCD surfaces measured by a 532 nm excitation laser and exhibit a well-defined peak at 1332 cm -1 , which is associated with ordered or crystalline diamond (sp 3 hybridization), and a broad peak in the 1500 cm -1 region (sp 2 hybridization), which is composed of a D peak at 1350 cm −1 (disordered carbon) and a G peak at 1580 cm −1 (graphitic carbon). [28,29]…”

Section: Chemical Characterization By Xps and Ramanmentioning

confidence: 99%

Intercrystallite Boundaries Dominate the Electrochemical Corrosion Behavior of Polycrystalline Diamond

Xiao,

Elam,

Vliet

et al. 2022

SSRN Journal

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Section: Chemical Characterization By Xps and Ramanmentioning

confidence: 99%

Intercrystallite Boundaries Dominate the Electrochemical Corrosion Behavior of Polycrystalline Diamond

Xiao,

Elam,

Vliet

et al. 2022

SSRN Journal

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“…29 Recently, the process of graphene synthesis on the diamond, which combines the hot filament CVD method and transitionmetal catalyst, has been demonstrated by an in situ synthesis experiment. 30 However, the atomistic mechanism of graphene growth on polycrystalline diamond remains elusive, especially in the vicinity of the GB defects as experimental techniques cannot capture the atomistic details of graphene growth. Therefore, we simulated the dynamical evolution process of graphene CVD growth on the bi-crystal diamonds in the presence of a nickel catalyst by reactive MD simulations, and the insightful understanding of the diamond GB effect during graphene growth was explored in depth.…”

Section: ■ Introductionmentioning

confidence: 99%

“…As a rule, it is very arduous to controllably produce the heterostructure of graphene-diamond by only high-temperature decomposition . Recently, the process of graphene synthesis on the diamond, which combines the hot filament CVD method and transition-metal catalyst, has been demonstrated by an in situ synthesis experiment . However, the atomistic mechanism of graphene growth on polycrystalline diamond remains elusive, especially in the vicinity of the GB defects as experimental techniques cannot capture the atomistic details of graphene growth.…”

Section: Introductionmentioning

confidence: 99%

Nickel-Mediated In Situ Growth Mechanism of Top-Layered Graphene in the Vicinity of Diamond Grain Boundary: A Theoretical Study

et al. 2022

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The growth of graphene on insulating materials is always a focused issue in the field of multifunctional nanomaterials. To investigate the atomistic mechanism of graphene growth on bicrystal diamonds, we initially investigated the process of in situ growth of graphene on bi-crystal diamonds in the presence of a nickel catalyst and further explored the diamond grain boundary (GB) effect on the graphene growth by reactive molecular dynamics (MD) simulations. The detailed dynamic evolution of graphene growth, the counterdiffusion of catalytic nickel atoms/ GB carbon atoms, and the consequent amorphization of GB were observed. The study demonstrated that the presence of GB assists graphene growth, namely, the amorphous C GB atoms participate in the growth of graphene as supplementary carbon atoms, which is in good qualitative agreement with experimental observations. In addition, we demonstrated that the amorphization of GB is caused by the increase of energy at GB driven by the catalysis of nickel atoms. The results further indicate that the diffusion behavior of the amorphous C GB atom in the nickel lattice involves irregular lateral migration instead of pure upward diffusion. In contrast, in the absence of GB, the kinetics of nickel catalyst-induced amorphization of diamond structures is drastically impaired, resulting in lower graphene coverage.

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“…Graphene is a 2D material with many exceptional properties such as high chemical stability, outstanding lubricity and wear resistance, which makes it a naturally solid lubricant at the microscale 1–4 . While in recent years, thanks to the rapid development of the fabrication method of macroscale graphene films, such as the chemical vapor deposition (CVD), 5 the solution‐processed graphene (SPG), 6 the self‐assembly, 7,8 and the electrophoretic deposition (EPD), 9–11 successful applications of graphene films as solid lubricants have extended to the engineering scale 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Substrate‐dependent enhancement of the durability of EPD graphene coating as a macroscale solid lubricant

Chen

Hong

Shen

2022

Surface & Interface Analysis

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Graphene has exhibited outstanding properties of reducing friction and wear when it is utilized as a novel solid lubricant, while its durability, especially at the macroscale, remains a challenge for robust industrial applications. In this study, we demonstrate a remarkable substrate‐dependent enhancement of the durability and load capacity of graphene film prepared with electrophoretic deposition method. The tribological performance of graphene films on four typical engineering material surfaces was examined. Graphene films exhibit highly consistent coefficients of friction ranging from 0.1 to 0.16, decreasing by 76%–87% compared with that obtained for the bare substrates (0.60–0.83). As for durability, graphene films on the stainless steel and titanium alloy substrates show largely enhanced lifetime compared with that on the silicon or cemented carbide substrates. The graphene film on titanium allay can sustain up to 260,000 cycles, 10–20 times longer than that on brittle substrates. Such a remarkably enhanced durability should be attributed to the relatively higher ductility of the substrates and its high adhesion with graphene, which is beneficial for forming a dense layer of graphene‐containing tribo‐film within the sliding interface. The results of this study may provide a useful guideline for utilizing graphene films as solid lubricants in engineering fields.

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Enhanced lubricity of CVD diamond films by in-situ synthetization of top-layered graphene sheets

Cited by 18 publications

References 44 publications

Intercrystallite Boundaries Dominate the Electrochemical Corrosion Behavior of Polycrystalline Diamond

Intercrystallite Boundaries Dominate the Electrochemical Corrosion Behavior of Polycrystalline Diamond

Nickel-Mediated In Situ Growth Mechanism of Top-Layered Graphene in the Vicinity of Diamond Grain Boundary: A Theoretical Study

Substrate‐dependent enhancement of the durability of EPD graphene coating as a macroscale solid lubricant

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