CN106323866B - The method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle - Google Patents
The method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle Download PDFInfo
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- CN106323866B CN106323866B CN201610669049.5A CN201610669049A CN106323866B CN 106323866 B CN106323866 B CN 106323866B CN 201610669049 A CN201610669049 A CN 201610669049A CN 106323866 B CN106323866 B CN 106323866B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The present invention provides a kind of method obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle, including：Graphene film talent scout's needle, including a cantilever and a needle point are provided, the needle point includes a spherical substrate and a graphene layer；A substrate is provided, the surface of the substrate has an extrinsic material；Graphene film talent scout's needle is contacted into extrinsic material, apply initial load to needle point, and under initial load effect, it rubs back and forth needle point in dissimilar materials layer surface, first group of voltage signal of needle point lateral twisting is obtained, and the first interfacial friction between graphene layer and extrinsic material is obtained by first group of voltage signal；Change the size of load, obtains second group of voltage signal, and the second interfacial friction is obtained by second group of voltage signal；And so on, by changing the size of load again, curve of the N groups interfacial friction with load change is obtained, the friction coefficient between graphene layer and extrinsic material is obtained by the slope of curve.
Description
Technical field
Graphene film talent scout's needle for atomic force microscope is utilized to rub between obtaining dissimilar materials the present invention relates to a kind of
The method of coefficient.
Background technology
Friction between the surface and interface of moving component can generally cause the failure of abrasion even parts.Component of machine
Abrasion and the energy of friction loss more highlight the realistic meaning of friction, lubrication.Limitation of the hydrodynamic lubrication material due to itself
Property, it is vulnerable under the harsh environments such as low speed, extreme pressure.The introducing of solid lubrication breaches the film lubrication limit, in poles such as spaces
It holds under occasion, shows huge superiority.For micro electronmechanical (MEMS) system of super hot investment casting, due to the reduction of size,
Secondary gap rub usually in nanoscale, the appearance of nanostructure solid lubricating film at this time drops mill in the anti-attrition of MEMS system
Field is widely used.
Atomic force microscope (AFM) is mainly based upon to the exploration of Nanotribology, nano-grade size not only may be implemented
With receive the measurement of the micro- power of ox grade, and the information such as three-dimensional appearance can be obtained simultaneously, realize the measurement for process.However, by
It is easy to wear under contact mode in common afm tip, causes the measurement error of micro- power, can not accurately obtain storeroom
Friction coefficient, and the superslide state between dissimilar materials (friction coefficient be less than 0.01) can not be obtained.
Invention content
In conclusion it is necessory to provide a kind of obtaining for friction coefficient between the dissimilar materials compared with high measurement accuracy can be obtained
Take method.
A method of using friction coefficient between graphene film talent scout's needle acquisition dissimilar materials, including：One graphene is provided
Film talent scout's needle, including a cantilever and a needle point, wherein the needle point includes a spherical substrate and a graphene layer, the graphite
Alkene layer is coated on the surface of the spherical substrate and is in direct contact with the spherical substrate, is pure graphite in the graphene layer
Alkene；A substrate is provided, the surface of the substrate has an extrinsic material, and the material of the extrinsic material is hexagonal boron nitride
Or molybdenum disulfide；Graphene film talent scout's needle is contacted into extrinsic material, applies initial load to needle point, and act in initial load
Under, it rubs back and forth needle point in dissimilar materials layer surface, obtains first group of voltage signal of needle point lateral twisting, and pass through first group
Voltage signal obtains the first interfacial friction between graphene layer and extrinsic material；The size for changing load, again different
The surface of the material bed of material rubs needle point back and forth, obtains second group of voltage signal, and passes through second group of voltage signal and obtain the second layer
Between frictional force；And so on, by changing the size of load again, N group interfacial frictions, wherein N >=2 are obtained, and then obtain N
Group interfacial friction is obtained by analyzing the slope of curve between graphene layer and extrinsic material with the curve of load change
Friction coefficient.
The needle point relative to extrinsic material frictional direction perpendicular to the cantilever extending direction.
Friction coefficient between the graphene layer and extrinsic material is 0.0025.
The graphene film talent scout needle and the extrinsic material are set in liquid, and the graphene film talent scout needle is in institute
The mantle friction for stating extrinsic material obtains friction coefficient.
The graphene layer includes multi-layer graphene film, and the number of plies of the graphene film is 3-10 layers, and thickness is received for 1
Rice is to 3 nanometers.
The graphene layer is a pure graphene-structured, and graphene is only contained in the graphene layer and does not contain function
Group.
The material of the spherical substrate is silica, and the graphene layer is directly grown in the outer surface of the silica.
A diameter of 5 microns to 10 microns of the spherical substrate.
Compared with prior art, the acquisition methods of friction coefficient provided by the invention, by directly coating graphene
It is carried out on the surface of traditional needle point and dissimilar materials to rubbing so that graphene film talent scout's needle set has excellent wear resistance, energy
The adhesion strength between probe and other surfaces is enough reduced, and there is extraordinary moisture resistance performance, so that utilizing the stone
When black alkene film talent scout's needle obtains dissimilar materials interlayer frictional force, there is very high measurement accuracy and service life, adaptability is good, energy
Enough obtain the state of superslide.
Description of the drawings
Fig. 1 is the structural schematic diagram of graphene film talent scout's needle provided in an embodiment of the present invention for atomic force microscope.
Fig. 2 is the electromicroscopic photograph of graphene film talent scout's needle described in Fig. 1.
Fig. 3 be Fig. 1 described in graphene film talent scout's needle in graphene layer electromicroscopic photograph.
Fig. 4 provides the signal that friction coefficient between dissimilar materials is obtained using graphene film talent scout's needle for the embodiment of the present invention
Figure.
Fig. 5 is to rub between the graphene film talent scout's needle measured under different loads provided in an embodiment of the present invention obtains dissimilar materials
Wipe the schematic diagram of coefficient.
Main element symbol description
Graphene film talent scout needle 100
Cantilever 10
Needle point 20
Spherical substrate 21
Graphene layer 22
Substrate 200
Extrinsic material 30
Following specific embodiment will be further illustrated the present invention in conjunction with above-mentioned attached drawing.
Specific implementation mode
Below with reference to attached drawing graphene film talent scout's needle for atomic force microscope that the present invention will be described in detail provides, and
The method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle.For convenience of description, the present invention introduces use first
In graphene film talent scout's needle of atomic force microscope.
Also referring to Fig. 1 to Fig. 3, graphene film talent scout needle 100 provided in an embodiment of the present invention include a cantilever 10 and
Needle point 20, the needle point 20 include a spherical substrate 21 and a graphene layer 22, and the spherical substrate 21 is a chondritic, institute
State the whole surface that graphene layer 22 is coated on the spherical substrate 21.
Specifically, the spherical substrate 21 is the spherical entity structure that homogenous material is formed.The material of the spherical substrate 21
Material can be metal, nonmetallic, high molecular polymer etc., as long as can carry graphene and be hard material, such as gold, oxygen
The hard materials such as SiClx, silicon carbide, silicon nitride, polystyrene can be selected as needed.In the present embodiment, the ball
The material of shape substrate 21 is silica, therefore the graphene layer 22 can directly be coated on the silicon oxide surface, and with it is described
Spherical substrate 21 is in direct contact.Specifically, the graphene layer 22 can be directly grown in the surface of the spherical substrate 21, to
It is in direct contact with the surface of the spherical substrate 21.The shape of the spherical substrate 21 be spherical shape, the spherical substrate 21 it is straight
Diameter can be 10 nanometers to 100 microns.Preferably, a diameter of 5 microns to 10 microns of the spherical substrate 21 so that the needle point
20 are easier to prepare, and are more advantageous to the measurement of follow-up interfacial friction.It is appreciated that the shape of the spherical substrate 21
Can be elliposoidal, and the one of symmetry axis of the ellipsoid is parallel to the extending direction of the cantilever 10.
The graphene layer 22 includes an at least single-layer graphene film, and the number of plies of the graphene layer 22 can be 3-10
The thickness of layer, the graphene layer 22 can be 1 nanometer to 3 nanometers, so that the graphene layer 22 is easier to prepare, and subtract
The influence of crust deformation of small probe.The graphene film is a continuous single layer of carbon atom layer, i.e. single-layer graphene, thickness 0.34
Nanometer.Preferably, the graphene once 22 the number of plies be less than or equal to 4 layers, on the one hand can reduce cost, reduce and prepare difficulty,
On the other hand, the stabilization that can keep graphene layer 22 in follow-up friction process, effectively prevent the number of plies excessively to lead to friction process
In fall off.Further, the graphene layer 22 is a pure graphene-structured, and the pure graphene-structured refers to the graphene
Only contain graphene in layer 22, further, only contain carbon atom in the graphene layer 22, is free of other impurities and functional group,
So as to reduce the influence of other impurities, subsequent measurement accuracy is improved.Further, since the graphene layer 22 is one pure
Graphene-structured, therefore the graphene layer 22 can firmly be coated on the surface of the spherical substrate 21, can effectively avoid
Falling off in subsequent measurement process.
The graphene layer 22 is continuously coated on the surface of the spherical substrate 21, and straight with the spherical substrate 21
Contact, to which the gapless cladding of spherical substrate 21 be got up.The needle point 20 is attached at one end of the cantilever 10,
And the shape of the needle point 20 is all spherical.Specifically, the needle point 20 can be attached at institute by an adhesive layer (not shown)
State the surface of cantilever 10.Due in needle point 20, the whole surface for being coated on spherical substrate 21 of the graphene layer 22, therefore institute
Intimate surface contact of the graphene layer 22 by adhesive layer and the cantilever 10 is stated, to which 20 entirety of needle point to be firmly fixed to
One end of the cantilever 10.
Referring to Fig. 4, friction coefficient between the acquisition dissimilar materials provided by the invention using the graphene film talent scout needle 100
Method include the following steps：
Step S10, provides a substrate 200, and the surface of the substrate 200 has an extrinsic material 30；
Graphene film talent scout needle 100 is contacted extrinsic material 30 by step S20, to the application initial load of needle point 20, and
It under initial load effect, rubs back and forth needle point 20 on 30 surface of extrinsic material, obtains first group of electricity of 20 lateral twisting of needle point
Signal is pressed, and the first interfacial friction is obtained by first group of voltage signal；
Step S30 changes the size of load, rubs back and forth needle point 20 on the surface of extrinsic material 30 again, obtains the
Two groups of voltage signals, and the second interfacial friction is obtained by second group of voltage signal；
Step S40, and so on, by changing the size of load again, N group interfacial frictions, N >=2 are obtained, and obtain
N groups frictional force is obtained by analyzing the slope of curve between graphene layer and extrinsic material 30 with the curve of load change
Friction coefficient.
In step slo, the surface of the substrate 200 is a flat surface, and 30 entirety of the extrinsic material is attached at described
On the surface of substrate 200." extrinsic material " refers to that the material of the extrinsic material is different from the graphene layer 22,
30 material of the extrinsic material can be one kind of molybdenum disulfide, hexagonal boron nitride, and the monoatomic layer of the extrinsic material
In be two-dimentional six-membered ring structure.The whole surface for being attached at the substrate 200 of the extrinsic material 30, the heterogeneous material
The thickness of the bed of material 30 is unlimited, as long as ensureing that the extrinsic material 30 can cover the entire surface of the substrate 200.
In step S20, the graphene film talent scout needle 100 can basis relative to the frictional direction of extrinsic material 30
It is selected, as long as it can ensure that getting frictional force that needle point 20 is subject in the friction with extrinsic material 30 i.e.
It can.Specifically, setting the extending direction of cantilever 10 as X-direction, perpendicular to X-direction and the direction on 200 surface of substrate is parallel to as the side Y
To then the frictional direction of the needle point 20 forms an angle theta with X-direction, and the θ is more than 0 degree and is less than or equal to 90 degree.Preferably,
For the frictional direction of the needle point 20 perpendicular to the frictional direction of the cantilever 10, i.e., the angle theta formed with X-direction is 90 degree, from
And the electric signal for getting the lateral twisting that needle point 20 is subject to and generating that can be more prone to, and then more convenient rubbed
Power, and ensure the accuracy of follow-up calculating and result of calculation.The electric signal that the torsion of the needle point 20 generates can be voltage signal
Or current signal, (not shown) can be equipped by a magnetic levitation and obtain the voltage signal that 20 lateral twisting of needle point generates, and counted
Calculation obtains between the size namely graphene layer 22 and extrinsic material 30 of the frictional force between needle point 20 and extrinsic material 30
The first interfacial friction size.
The computational methods of the frictional force can utilize frictional force ring.It is past that frictional force ring refers to that afm scan obtains
Two sections of multiple force signals, the computational methods of frictional force are to subtract each other the force signal of drag ring divided by 2.
In step S30 to step S40, by changing load, and then change between needle point 20 and extrinsic material 30
The size of frictional force.By exploratory probe lateral twisting again generate voltage signal, can be obtained by calculation needle point 20 with it is different
Between the material bed of material 30 between the size of frictional force namely graphene layer 22 and extrinsic material 30 second interfacial friction it is big
It is small.It can tentatively be obtained between graphene layer 22 and extrinsic material 30 by the first interfacial friction and the second interfacial friction
Friction coefficient size.Further, it to obtain more accurate as a result, the size of load can be varied multiple times, and then detects and obtains
Multigroup voltage signal, to obtain curve of multigroup interfacial friction with load change.It is oblique by analyzing frictional force-curve of load
Rate, you can obtain friction coefficient.
Referring to Fig. 5, being measured under different loads as extrinsic material 30 using hexagonal boron nitride in the present embodiment
Frictional force between graphene film talent scout needle and hexagonal boron nitride.By using graphene film talent scout needle and six sides it is found that working as in figure
When boron nitride is to rubbing, the friction coefficient of acquisition is 0.0025, that is, has reached superslide state.
Further, the present embodiment is further tested the stability of the graphene film talent scout needle.The graphite
Same position of the alkene film talent scout needle with the contact stress of 1Gpa in hexagonal boron nitride rubs repeatedly, the superslide after two hours
It just fails, it was demonstrated that the graphene film talent scout can realize stable superslide state for hexagonal boron nitride.In addition, working as the position
Superslide state failure after, superslide can be still obtained when the graphene film talent scout needle is moved to new position, to demonstrate,prove
The bright graphene film talent scout needle especially needle point has very excellent wear resistance.
In addition, the present embodiment is further tested the moisture resistance performance of the graphene film talent scout needle.Passing through will
Vapor and nitrogen are passed through environmental chamber with predetermined ratio, obtain different humidity, to the moisture resistance performance of graphene film talent scout's needle
It is tested.For the graphene film talent scout needle in the environment that humidity is 31.8%, the displacement distance relative to graphite is 1 micron
When to 10 microns, it is able to maintain that superslide state；In addition, being up to 51% in humidity between the graphene film talent scout needle and graphite
When, it remains able to maintain superslide state, to prove that the graphene film talent scout needle set has extraordinary moisture resistance, and in height
Still there is excellent wear resistance in the case of humidity.
The present invention provides the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle, by by graphene
Directly it is coated on the surface of traditional needle point so that graphene film talent scout's needle set has excellent wear resistance, can reduce probe
Adhesion strength between other surfaces, and there is extraordinary moisture resistance performance, so that utilizing graphene film talent scout
When needle measures the interfacial friction between dissimilar materials, there is very high measurement accuracy and service life, adaptability is good, and energy
Enough states for reaching superslide between extrinsic material.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of method obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle, including：
There is provided graphene film talent scout's needle, including a cantilever and a needle point, which is characterized in that the needle point includes a spherical substrate
And a graphene layer, the graphene layer are coated on the surface of the spherical substrate and are in direct contact with the spherical substrate, institute
It is pure graphene to state in graphene layer；
A substrate is provided, there is an extrinsic material, the material of the extrinsic material to be nitrogenized for six sides on the surface of the substrate
Boron or molybdenum disulfide；
Graphene film talent scout's needle is contacted into extrinsic material, applies initial load to needle point, and under initial load effect, different
Material layer surface rubs needle point back and forth, obtains first group of voltage signal of needle point lateral twisting, and passes through first group of voltage letter
Number obtain the first interfacial friction between graphene layer and extrinsic material；
Change the size of load, rub back and forth needle point on the surface of extrinsic material again, obtains second group of voltage signal, and lead to
It crosses second group of voltage signal and obtains the second interfacial friction；
And so on, by changing the size of load again, N group interfacial frictions, wherein N >=2 are obtained, and then obtain N group layers
Between frictional force with the curve of load change, pass through the slope of curve and obtain friction system between graphene layer and extrinsic material
Number.
2. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
Be, the needle point relative to extrinsic material frictional direction perpendicular to the cantilever extending direction.
3. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
It is, the friction coefficient between the graphene layer and extrinsic material is 0.0025.
4. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
It is, the graphene film talent scout needle and the extrinsic material are set in liquid, and the graphene film talent scout needle is described
The mantle friction of extrinsic material obtains friction coefficient.
5. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
It is, the graphene layer includes multi-layer graphene film, and the number of plies of the graphene film is 3-10 layers, and thickness is 1 nanometer
To 3 nanometers.
6. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
It is, the graphene layer is a pure graphene-structured, and graphene is only contained in the graphene layer and does not contain functional group.
7. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
It is, the material of the spherical substrate is silica, and the graphene layer is directly grown in the outer surface of the silica.
8. the method for obtaining friction coefficient between dissimilar materials using graphene film talent scout's needle as described in claim 1, feature
It is, a diameter of 5 microns to 10 microns of the spherical substrate.
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| CN110488044B (en) * | 2019-07-29 | 2020-09-22 | 清华大学 | Method for realizing ultra-smoothness between AFM probe with conical tip and graphite surface |
| CN110749752B (en) * | 2019-10-12 | 2021-05-14 | 清华大学 | Two-dimensional material probe for atomic force microscope and preparation method and application thereof |
| CN111439746B (en) * | 2020-05-20 | 2021-07-23 | 东华大学 | Preparation method of single-layer graphene folding structure with controllable torsion angle |
| CN111847435B (en) * | 2020-06-28 | 2022-02-18 | 深圳清华大学研究院 | Method for adjusting friction coefficient of two-dimensional material |
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