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Li Z, Liu M, Kumar P, Chang Z, Qi G, He P, Wei Y, Young RJ, Novoselov KS. Interfacial Stress Transfer and Fracture in van der Waals Heterostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2411244. [PMID: 39358939 DOI: 10.1002/adma.202411244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2024] [Revised: 09/11/2024] [Indexed: 10/04/2024]
Abstract
Artificially stacking 2D materials (2DMs) into vdW heterostructures creates materials with properties not present in nature that offer great potential for various applications such as flexible electronics. Properties of such stacked structures are controlled largely by the interfacial interactions and the structural integrity of the 2DMs. In spite of their crucial roles, interfacial stress transfer and the failure mechanisms of the vdW heterostructures, particularly during deformation, have not been well addressed so far. In this work, the interfacial stress transfer and failure mechanisms of a MoS2/graphene vdW heterostructure are studied, through the strain distributions both laterally in individual 2DMs and vertically across different 2DMs revealed in-situ. The fracture of the MoS2 and the associated states of stress and strain are monitored experimentally. This enables various interfacial properties, such as the interfacial shear strength and interfacial fracture energy, to be estimated. Based only on the measured strength and interfacial properties of a single vdW heterostructure, a failure criterion is proposed to predict the failure mechanisms of similar vdW heterostructures with any lateral dimensions. This work provides an insight to the deformation micromechanics of vdW heterostructures that are of great value for their miniaturization and applications, especially in flexible electronics.
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Affiliation(s)
- Zheling Li
- College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China
| | - Mufeng Liu
- National Graphene Institute and Department of Materials, The University of Manchester, Manchester, M13 9PL, UK
| | - Pankaj Kumar
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore, 117575, Singapore
| | - Zhenghua Chang
- Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, 315200, China
- Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Guocheng Qi
- Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing, 100044, China
| | - Pei He
- School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, China
| | - Yujie Wei
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Robert J Young
- National Graphene Institute and Department of Materials, The University of Manchester, Manchester, M13 9PL, UK
| | - Kostya S Novoselov
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore, 117575, Singapore
- National Graphene Institute and Department of Physics, The University of Manchester, Manchester, M13 9PL, UK
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Wang Y, Yang X, Liang H, Zhao J, Zhang J. Macroscale Superlubricity on Nanoscale Graphene Moiré Structure-Assembled Surface via Counterface Hydrogen Modulation. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2309701. [PMID: 38483889 PMCID: PMC11109616 DOI: 10.1002/advs.202309701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/23/2024] [Indexed: 05/23/2024]
Abstract
Interlayer incommensurateness slippage is an excellent pathway to realize superlubricity of van der Waals materials; however, it is instable and heavily depends on twisted angle and super-smooth substrate which pose great challenges for the practical application of superlubricity. Here, macroscale superlubricity (0.001) is reported on countless nanoscale graphene moiré structure (GMS)-assembled surface via counterface hydrogen (H) modulation. The GMS-assembled surface is formed on grinding balls via sphere-triggered strain engineering. By the H modulation of counterface diamond-like carbon (25 at.% H), the wear of GMS-assembled surface is significantly reduced and a steadily superlubric sliding interface between them is achieved, based on assembly face charge depletion and H-induced assembly edge weakening. Furthermore, the superlubricity between GMS-assembled and DLC25 surfaces holds true in wide ranges of normal load (7-11 N), sliding velocity (0.5-27 cm -1s), contact area (0.4×104-3.7×104 µm2), and contact pressure (0.19-1.82 GPa). Atomistic simulations confirm the preferential formation of GMS on a sphere, and demonstrate the superlubricity on GMS-assembled surface via counterface H modulation. The results provide an efficient tribo-pairing strategy to achieve robust superlubricity, which is of significance for the engineering application of superlubricity.
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Affiliation(s)
- Yongfu Wang
- State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou730000China
- Key Laboratory of Science and Technology on Wear and Protection of MaterialsLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China
| | - Xing Yang
- State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou730000China
| | - Huiting Liang
- State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou730000China
| | - Jun Zhao
- Division of Machine ElementsDepartment of Engineering Sciences and MathematicsLuleå University of TechnologyLuleåSE‐97187Sweden
| | - Junyan Zhang
- State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou730000China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
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Li Y, Wu B, Ouyang W, Liu Z, Wang W. Experimental Decoding and Tuning Electronic Friction of Si Nanotip Sliding on Graphene. NANO LETTERS 2024; 24:1130-1136. [PMID: 38252698 DOI: 10.1021/acs.nanolett.3c03642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Due to the coupled contributions of adhesion and carrier to friction typically found in previous research, decoupling the electron-based dissipation is a long-standing challenge in tribology. In this study, by designing and integrating a graphene/h-BN/graphene/h-BN stacking device into an atomic force microscopy, the carrier density dependent frictional behavior of a single-asperity sliding on graphene is unambiguously revealed by applying an external back-gate voltage, while maintaining the adhesion unaffected. Our experiments reveal that friction on the graphene increases monotonically with the increase of carrier density. By adjusting the back-gate voltage, the carrier density of the top graphene layer can be tuned from -3.9 × 1012 to 3.5 × 1012 cm-2, resulting in a ∼28% increase in friction. The mechanism is uncovered from the consistent dependence of the charge density redistribution and sliding barrier on the carrier density. These findings offer new perspectives on the fundamental understanding and regulation of friction at van der Waals interfaces.
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Affiliation(s)
- Yutao Li
- School of Mechanical Engineering, Southwest Jiaotong University, 610031 Chengdu, China
| | - Bozhao Wu
- Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China
| | - Wengen Ouyang
- Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China
| | - Ze Liu
- Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China
| | - Wen Wang
- School of Mechanical Engineering, Southwest Jiaotong University, 610031 Chengdu, China
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