Friction characteristics of mechanically exfoliated and CVD-grown single-layer MoS2

Ky, Dinh Le Cao; Khac, Bien-Cuong Tran; Le, Chinh Tam; Kim, Yong Soo; Chung, Koo–Hyun

doi:10.1007/s40544-017-0172-8

Cited by 62 publications

(47 citation statements)

References 53 publications

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“…[ 11,12 ] Therefore, researchers in the field of tribology have conducted extensive research on the friction properties and wear resistance of nanomaterials. [ 11,13,14 ] 2D materials with layered structure include single‐layer or multi‐layer with atomic thickness and ultra‐low shear strength. They have the characteristics of large specific surface area, high in‐plane strength, weak interlayer interaction and good surface chemical stability, and thus have very low friction and wear‐resisting properties.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, when 3D graphene and 2D h‐BN are added into the base oil as lubrication additives, it is essential to ensure that the 3D graphene and the 2D h‐BN nanoparticles are uniformly dispersed in the base oil without any agglomeration. [ 13 ] At present, two methods are mainly used to solve the agglomeration problem. First, the uniform dispersibility of graphene in the base lubricating oil can be improved by the dispersant.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Geng

et al. 2020

Adv Materials Inter

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Nanomaterials as oil‐based lubricant additives improve the tribological properties of oils, and its enormous potential in oil‐based applications has attracted increasing attention. However, 2D materials have limited applications in industry due to its high price. 3D graphene (3D Gr) has become a substitute of 2D graphene because of its low price. Hexagonal boron nitride (h‐BN) is known as white graphene and is a material with potential lubrication applications. In this paper, the combination of the two different dimensions materials not only plays a significant role in reducing environmental pollution, but also exerts excellent properties of both materials. The results show that the mixed‐dimensional nanomaterials have good macroscopic lubricity under oil.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Geng

et al. 2020

Adv Materials Inter

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“…Although these methods have shown great potential in producing large-scale atomically-thin films, several problems including the crystalline quality and grain boundary structure still remain as compared to the pristine materials produced via mechanical exfoliation methods [29,35]. For example, CVD-growth MoS 2 was recently found to exhibit poor friction characteristics compared to that of pristine MoS 2 [36]. To improve the quality of the CVD-growth MoS 2 , efforts have been made to optimize the deposition conditions using the frictional behavior for pristine materials as the guideline [36].…”

Section: Introductionmentioning

confidence: 99%

Operational and environmental conditions regulate the frictional behavior of two-dimensional materials

Tran-Khac

Kim

DelRio

et al. 2019

Applied Surface Science

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The friction characteristics of single-layer h-BN, MoS2, and graphene were systematically investigated via friction force microscopy measurements at various operational (e.g., normal force and sliding speed) and environmental (e.g., relative humidity and thermal annealing) conditions. The low friction characteristics of these single-layer materials were clearly observed from the normal force-dependent friction results, and their interfacial shear strengths were further estimated using a Hertz-plus-offset model. In addition, speed-dependent friction characteristics clearly demonstrated two regimes of friction as a function of sliding speed – the first is the logarithmic increase in friction with sliding speed regime at sliding speeds smaller than the critical speed and the second is the friction plateau regime at sliding speeds greater than the critical speed. Fundamental parameters such as effective shape of the interaction potential and its corrugation amplitude for these single-layer materials were characterized using the thermally-activated Prandtl-Tomlinson model. Moreover, friction of single-layer h-BN, MoS2, and graphene was found to increase with relative humidity and decrease with thermal annealing; these trends were attributed to the diffusion of water molecules to the interface between the single-layer materials and their substrates, which leads to an increase in the puckering effect at the tip-material interface and interaction potential corrugation. The enhanced puckering effect was verified via molecular dynamics simulations. Overall, the findings enable a comprehensive understanding of friction characteristics for several classes of two-dimensional materials, which is important to elucidate the feasibility of using these materials as protective and solid-lubricant coating layers for nanoscale devices.

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“…Recent nanoscale experiments have revealed that layered materials, down to one atomic layer, also show outstandingly low surface friction when they slid against other counter surfaces [22,28]. Asides weak interlayer interaction, regular atomic arrangements are also known to impact these materials with the potential to achieve super-low friction, otherwise known as superlubricity [29,30]. Also, regarding few-layered 2D materials, it has been shown that the static frictional force gradually increases for a few initial atomic periods before reaching a steady value.…”

Section: Characteristics Of 2d Materialsmentioning

confidence: 99%

Tribology of 2D Nanomaterials: A Review

Uzoma¹,

Hu²,

Khadem³

et al. 2020

Preprint

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The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN, and Black Phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear, and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.

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Friction characteristics of mechanically exfoliated and CVD-grown single-layer MoS2

Cited by 62 publications

References 53 publications

Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Operational and environmental conditions regulate the frictional behavior of two-dimensional materials

Tribology of 2D Nanomaterials: A Review

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