Interlayer friction behavior of molybdenum ditelluride with different structures

The interlayer friction behavior of two-dimensional transition metal dichalcogenides (TMDCs) as crucial solid lubricants has attracted extensive attention in the field of tribology. In this study, the interlayer friction is measured by laterally pushing the MoTe 2 powder on the MoTe 2 substrate with...

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Bibliographic Details
Published in:Nano research 2023-08, Vol.16 (8), p.11375-11382
Main Authors: Zhang, Lina, Tan, Xinfeng, Jiao, Jianguo, Guo, Dan, Luo, Jianbin
Format: Article
Language:English
Subjects:
Atomic force microscopy
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Coefficient of friction
Condensed Matter Physics
Density functional theory
Electrostatic properties
Friction
Friction reduction
Heterojunctions
Interlayers
Lubricants
Materials Science
Molybdenum
Molybdenum compounds
Molybdenum disulfide
Nanotechnology
Phase transitions
Potential energy
Research Article
Shear strength
Solid lubricants
Substrates
Tellurides
Transition metal compounds
Tribology
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Summary:The interlayer friction behavior of two-dimensional transition metal dichalcogenides (TMDCs) as crucial solid lubricants has attracted extensive attention in the field of tribology. In this study, the interlayer friction is measured by laterally pushing the MoTe 2 powder on the MoTe 2 substrate with the atomic force microscope (AFM) tip, and density functional theory (DFT) simulations are used to rationalize the experimental results. The experimental results indicate that the friction coefficient of the 1T′-MoTe 2 /1T′-MoTe 2 interface is 2.025 × 10 −4 , which is lower than that of the 2H-MoTe 2 /2H-MoTe 2 interface (3.086 × 10 −4 ), while the friction coefficient of the 1T′-MoTe 2 /2H-MoTe 2 interface is the lowest at 6.875 × 10 −5 . The lower interfacial friction of 1T′-MoTe 2 /1T′-MoTe 2 compared to 2H-MoTe 2 /2H-MoTe 2 interface can be explained by considering the relative magnitudes of the ideal average shear strengths and maximum shear strengths based on the interlayer potential energy. Additionally, the smallest interlayer friction observed at the 1T′-MoTe 2 /2H-MoTe 2 heterojunction is attributed to the weak interlayer electrostatic interaction and reduction in potential energy corrugation caused by the incommensurate contact. This work suggests that MoTe 2 has comparable interlayer friction properties to MoS 2 and is expected to reduce interlayer friction in the future by inducing the 2H-1T′ phase transition.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-023-5835-3