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Method for regulating friction coefficient of graphene surface by surface confinement effect

A graphene surface, friction coefficient technology, applied in chemical instruments and methods, instruments, carbon compounds, etc., can solve problems such as graphite unsuitability, and achieve the effect of small friction coefficient and uniform friction distribution

Inactive Publication Date: 2018-08-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite is not suitable as a lubricant for M / NEMS because ink sheets are on the micron or millimeter scale and the separation between M / NEMS can range from 1 μm / 100 nm to contact

Method used

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  • Method for regulating friction coefficient of graphene surface by surface confinement effect
  • Method for regulating friction coefficient of graphene surface by surface confinement effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Graphene Transfer

[0033] Step 1.1: Etch copper platinum with PMMA / graphene film on the surface with ferric nitrate solution until the PMMA / graphene film floats to the solution surface. The concentration of ferric nitrate solution in distilled water is 0.27g / mL;

[0034] Step 1.2: Pick up the PMMA / graphene membrane and put it in distilled water for 10 minutes, and repeat three times to wash off the residual ferric nitrate solution on the membrane;

[0035] Step 1.3: Pick up an anodized aluminum sheet with tweezers, and pick it up from the bottom of the PMMA / graphene film to obtain an anodized aluminum support PMMA / graphene film;

[0036] Step 1.4: Put the anodized aluminum support PMMA / graphene film obtained in step 3 to dry in the air for 30 minutes;

[0037] Step 1.5: heating at 80° C. for 30 minutes to flatten the graphene film;

[0038] Step 1.6: Acetone bath to remove PMMA on the surface to obtain graphene film supported on anodized alumina.

[0039] S...

Embodiment 2

[0051] The anodized aluminum substrate in step 1.1 of Example 1 was changed to uniform mesoporous polymer R / HMTA-0.3, and other conditions remained the same.

Embodiment 3

[0053] The anodized aluminum substrate in step 1.1 of Example 1 was changed to titanium oxide nanotubes, and other conditions remained the same.

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PUM

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Abstract

The invention provides a method for regulating the friction coefficient of a graphene surface by a surface confinement effect. The method comprises the following steps: etching copper platinum havinga PMMA / graphene film on the surface by using an iron nitrate solution; cleaning the obtained PMMA / graphene film in distilled water; picking up an anodized aluminum sheet from below the PMMA / graphene film, drying the PMMA / graphene film, and heating the PMMA / graphene film to flatten the graphene film; performing acetone bath treatment; measuring the friction force in a contact mode by using an atomic force tip; converting an average lateral force given by an output voltage into the friction force generated due to the torsion of a cantilever; measuring the instantaneous desorption force curve; performing molecular dynamics simulation to obtain a change curve of the frictional force and normal load; and calculating the interaction energy of the tip on the graphene surface during scanning. A nano-pore structured AAO template with a clear boundary and a defined structure is adopted to support graphene in order to explore the basic process of nano-scale friction and control the nano-micro friction force through AFM.

Description

technical field [0001] The invention belongs to the technical field of graphene thin film tribology, and in particular relates to a method for regulating the friction coefficient of graphene surface through the surface confinement effect. Background technique [0002] It is well known that friction at the nanoscale is detrimental to the operating efficiency, output power, and application reliability of micro / nanoelectromechanical systems (M / NEMS). Liquid lubrication is a common method to minimize the friction of sliding interfaces, but the shear pressure between two relatively sliding contact surfaces at the nanoscale and microscale will make the liquid easily squeezed out of the contact area, resulting in direct solid-solid interfacial contact so that Increased adhesion and friction. As an alternative strategy, the two-dimensional carbon material graphene can be made into a very thin solid lubricant. Friction between monolayer and bilayer graphene films supported on SiC s...

Claims

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Application Information

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IPC IPC(8): G01N19/02C01B32/194
CPCC01B32/194G01N19/02
Inventor 范鹏鹏安蓉吴沐秋唐勇
Owner NANJING UNIV OF SCI & TECH
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