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Method for adjusting friction force of molybdenum disulfide by constructing interface liquid drops

A technology of molybdenum disulfide and single-layer molybdenum disulfide, which is applied in the field of nano-material lubrication, can solve the problems of difficult control of characteristics and increased friction, and achieve the effect of reducing friction, enhancing lubrication performance, and surface cleaning without wrinkles

Active Publication Date: 2022-03-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, molybdenum disulfide exhibits various characteristics in tribology at the micro-nano scale, such as layer number dependence, friction anisotropy, friction hysteresis, and structural superlubricity, etc., but these characteristics are difficult to control, and control and in many Minimizing the friction under certain conditions has been the goal pursued for a long time, but there is still no simple and effective method to controllably adjust the friction force of molybdenum disulfide
In addition, compared with bulk molybdenum disulfide, single-layer molybdenum disulfide is more suitable for application in micro-nano devices due to its smaller size, but the deformation ability and shrinkage effect of single-layer molybdenum disulfide itself will make friction Increased, and thus controllable regulation and reduction of friction in monolayer MoS2 are currently urgent problems to be solved

Method used

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  • Method for adjusting friction force of molybdenum disulfide by constructing interface liquid drops
  • Method for adjusting friction force of molybdenum disulfide by constructing interface liquid drops
  • Method for adjusting friction force of molybdenum disulfide by constructing interface liquid drops

Examples

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Effect test

Embodiment 1

[0044] A method for constructing interfacial liquid droplets to regulate molybdenum disulfide friction, the steps are as follows:

[0045] (1) Coating: the anisole solution (mass concentration of 10 microliters of polymethyl methacrylate (PMMA) is 4.5%, PMMA relative molecular mass 950K) is evenly spin-coated on the growth there is monolayer molybdenum disulfide The molybdenum disulfide surface of a silicon wafer (0.5cm×0.5cm) was spin-coated at 500rpm for 10 seconds, and then spin-coated at 2000rpm for one and a half minutes. Then anneal in air at 90° C. for 3 minutes to solidify the PMMA to obtain a PMMA / molybdenum disulfide / silicon wafer.

[0046] (2) Etching: immerse the PMMA / molybdenum disulfide / silicon wafer in 3mol / L KOH aqueous solution for etching, and the etching temperature is 160°C. After the etching is completed, the PMMA film with molybdenum disulfide will be separated from the silicon wafer, and the separated PMMA film will be placed in a 3mol / L KOH aqueous sol...

Embodiment 2

[0053] A method for constructing interfacial liquid droplets to regulate molybdenum disulfide friction, the steps are as follows:

[0054] (1) Coating: the anisole solution (mass concentration is 4.5%, PMMA relative molecular mass 950K) of 20 microliters of polymethyl methacrylate (PMMA) is evenly spin-coated on the growth there is monolayer molybdenum disulfide The molybdenum disulfide surface of a silicon wafer (1 cm×1 cm) was spin-coated at 500 rpm for 10 seconds, and then spin-coated at 2000 rpm for one and a half minutes. Then anneal in air at 90° C. for 3 minutes to solidify the PMMA to obtain a PMMA / molybdenum disulfide / silicon wafer.

[0055] (2) Etching: immerse the PMMA / molybdenum disulfide / silicon wafer in 4mol / L NaOH aqueous solution for etching, and the etching temperature is 160°C. After the etching is completed, the PMMA film with molybdenum disulfide will be separated from the silicon wafer, and the separated PMMA film will be placed in a 4mol / L NaOH aqueous s...

Embodiment 3

[0059] A method for constructing interfacial liquid droplets to regulate molybdenum disulfide friction, the steps are as follows:

[0060] (1) Coating: the anisole solution (mass concentration is 4.5%, PMMA relative molecular mass 950K) of 20 microliters of polymethyl methacrylate (PMMA) is evenly spin-coated on the growth there is monolayer molybdenum disulfide The molybdenum disulfide surface of a silicon wafer (1 cm×1 cm) was spin-coated at 500 rpm for 10 seconds, and then spin-coated at 2000 rpm for one and a half minutes. Then anneal in air at 90° C. for 3 minutes to solidify the PMMA to obtain a PMMA / molybdenum disulfide / silicon wafer.

[0061] (2) Etching: immerse the PMMA / molybdenum disulfide / silicon wafer in 3mol / L KOH aqueous solution for etching, and the etching temperature is 160°C. After the etching is completed, the PMMA film with molybdenum disulfide will be separated from the silicon wafer, and the separated PMMA film will be placed in a 3mol / L KOH aqueous sol...

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Abstract

The invention provides a method for adjusting friction force of molybdenum disulfide by constructing interface liquid drops. The method comprises the following steps: uniformly coating a polymethyl methacrylate solution on a molybdenum disulfide surface on which a single-layer molybdenum disulfide silicon substrate grows, and then annealing to obtain a PMMA / molybdenum disulfide / silicon substrate; washing with an etching solution to obtain a PMMA / molybdenum disulfide composite film, and storing the PMMA / molybdenum disulfide composite film in deionized water; transferring the composite film to a substrate, and carrying out annealing treatment; and then the PMMA film is removed, and the molybdenum disulfide / substrate is obtained through annealing treatment. According to the method, by constructing the interface liquid drops with different sizes, the deformation performance and the surface internal stress of the atomic-scale thickness of the single-layer molybdenum disulfide can be adjusted, so that the friction performance of the single-layer molybdenum disulfide is effectively controlled, the friction force of the single-layer molybdenum disulfide can be reduced, and the lubricating performance is enhanced.

Description

technical field [0001] The invention relates to a method for constructing interface droplets to adjust the frictional force of molybdenum disulfide, which belongs to the technical field of nanometer material lubrication. Background technique [0002] Friction is almost unavoidable in all kinematic systems and often leads to energy dissipation (e.g., vibrations of surface atoms, chemical interactions, electron excitation during electron-hole coupling, etc.), which determine the efficiency and service life. Especially for MEMS with high specific surface area, friction is the main factor restricting its development. Fortunately, two-dimensional layered materials with excellent lubricating properties and mechanical properties (such as super strong fracture strength and high Young's modulus) can be used as effective solid lubricants and are increasingly used in many engineering , so that the coefficient of friction can be effectively reduced to 0.05-0.2. Therefore, it is of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M103/06C10M177/00
CPCC10M103/06C10M177/00C10M2201/0663C10N2030/06C10N2050/14Y02P70/50
Inventor 李强许铭源张德良
Owner SHANDONG UNIV
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