阅读说明：本技术 一种多元二维复合材料及其制备方法 (Multi-element two-dimensional composite material and preparation method thereof ) 是由 尹绚 陈新春 于 2019-09-03 设计创作，主要内容包括：本发明提供了一种多元二维复合材料及其制备方法,所述多元二维复合材料包括：二维材料、量子点材料和零维材料；所述零维材料的结构为零维纳米颗粒,所述零维纳米颗粒的平均粒度记为x,x的取值为10nm＜x≤55nm。上述多元二维复合材料的制备方法,包括：将基材放置在容器底部；将二维材料、量子点材料与零维材料分别加入到溶剂中并分散均匀；待二维材料、量子点材料与零维材料全部铺满基材表面后取出基材,静置至溶剂蒸发完全,即得多元二维复合材料。本发明提供的多元二维复合材料,克服了传统二维固体润滑剂结构易退化、耐候性差、易磨损的缺陷,实现了多元纳米材料的协同复配,使复合材料具备优异的润滑性能和极低的磨损。(The invention provides a multielement two-dimensional composite material and a preparation method thereof, wherein the multielement two-dimensional composite material comprises the following components: two-dimensional materials, quantum dot materials, and zero-dimensional materials; the structure of the zero-dimensional material is zero-dimensional nano particles, the average particle size of the zero-dimensional nano particles is recorded as x, and the value of x is more than 10nm and less than or equal to 55 nm. The preparation method of the multielement two-dimensional composite material comprises the following steps: placing the substrate at the bottom of the container; respectively adding a two-dimensional material, a quantum dot material and a zero-dimensional material into a solvent and uniformly dispersing; and taking out the base material after the two-dimensional material, the quantum dot material and the zero-dimensional material are fully paved on the surface of the base material, and standing until the solvent is completely evaporated to obtain the multielement two-dimensional composite material. The multielement two-dimensional composite material provided by the invention overcomes the defects of easy degradation, poor weather resistance and easy abrasion of the traditional two-dimensional solid lubricant structure, realizes the synergistic compounding of multielement nano materials, and enables the composite material to have excellent lubricating property and extremely low abrasion.)

1. A multi-element two-dimensional composite, wherein the multi-element two-dimensional composite comprises: two-dimensional materials, quantum dot materials, and zero-dimensional materials;

the structure of the zero-dimensional material is zero-dimensional nano particles, the average particle size of the zero-dimensional nano particles is recorded as x, and the value of x is more than 10nm and less than or equal to 55 nm.

2. The multi-element two-dimensional composite according to claim 1,

the mass ratio of the two-dimensional material to the quantum dot material to the zero-dimensional material is (1-100) to (1-100);

preferably, the mass ratio of the two-dimensional material to the quantum dot material to the zero-dimensional material is (1-10) to (1-10);

more preferably, the mass ratio of the two-dimensional material, the quantum dot material and the zero-dimensional material is 1:1: 1.

3. The multielement two-dimensional composite material according to claim 1, wherein the structure of the two-dimensional material is a nanoscale lamellar structure with a surface size of 5-500 nm;

optionally, the two-dimensional material is selected from one or more of two-dimensional transition metal carbide, two-dimensional transition metal nitride, molybdenum disulfide, and tungsten disulfide;

preferably, the two-dimensional material is one or more of a two-dimensional transition metal carbide or a two-dimensional transition metal nitride.

4. The multi-element two-dimensional composite material according to any one of claims 1 to 3, wherein the quantum dot material has a size ranging from 2 to 10nm and an interlayer spacing of 0.2 to 0.3 nm.

5. The multi-element two-dimensional composite material according to any one of claims 1 to 3, wherein the quantum dot material is selected from one or more of graphene quantum dots, carbon quantum dots, molybdenum disulfide quantum dots, and tungsten disulfide quantum dots;

preferably, the quantum dot material is graphene quantum dots.

6. The multi-element two-dimensional composite material according to any one of claims 1 to 3, wherein the zero-dimensional material is selected from any one of nanodiamond, nanosilver and nanocube boron nitride;

preferably, the zero-dimensional material is nanodiamond.

7. A method of preparing the multicomponent two-dimensional composite material according to any one of claims 1 to 6, comprising the steps of:

(1) placing the substrate at the bottom of the container;

(2) respectively adding a two-dimensional material, a quantum dot material and a zero-dimensional material into a solvent and uniformly dispersing;

(3) and taking out the base material after the two-dimensional material, the quantum dot material and the zero-dimensional material are fully paved on the surface of the base material, and standing until the solvent is completely evaporated to obtain the multielement two-dimensional composite material.

8. The multi-element two-dimensional composite material according to any one of claim 7, wherein the substrate is one or more of metal, metal oxide, silicon, ceramic or plastic; preferably, the substrate is silicon;

optionally, the solvent is selected from one or more of absolute ethyl alcohol, acetone, ethylene glycol and propylene glycol; preferably, the solvent is absolute ethanol.

9. The preparation method of the multielement two-dimensional composite material according to claim 7 or 8, wherein the mass concentration of the sum of the two-dimensional material, the quantum dot material and the zero-dimensional material in the solvent is 0.001mg/mL-10.0mg/mL,

the mass concentration is preferably 1 to 5mg/mL, and more preferably 3 mg/mL.

10. The preparation method of the multi-element two-dimensional composite material as claimed in claim 7 or 8, wherein the dispersion in step (2) is ultrasonic dispersion under vacuum or inert atmosphere gas protection, the ultrasonic frequency is 20-40kHz, the ultrasonic power is 100-200W, and the ultrasonic time is 30-60 min;

and (3) standing under the conditions of inert atmosphere, light protection and protection at the temperature lower than 8 ℃ until the solvent is completely evaporated.

Technical Field

The present invention relates to a surface treatment technology of mechanical engineering, in particular to a multielement two-dimensional composite material and a preparation method thereof, and particularly to an ultra-long wear resistant carbon quantum dot multielement two-dimensional composite material and a preparation method thereof.

Background

In the past, traditional two-dimensional solid lubricants such as graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, and the like, due to their inherent advantages of anti-friction and wear, can form a thin film or a thin coating by vapor deposition or spray coating of a surface, and achieve the performance of anti-friction and wear of mechanical devices. However, for example, graphene coating has short wear life in long-term friction, and is not suitable for common application environments.

Generally, in air, the multilayer layered structure of graphene is damaged and graphitized in friction wear, which greatly affects the performance of the graphene coating. The lubricating materials are classified into lubricating oils, greases, and solid lubricants according to physical conditions and properties. The lubricating liquid is generally referred to as lubricating oil, is mainly used for parts such as engine bearings, gears, cylinders, pistons, connecting rods and the like, and can circularly flow in a closed system during operation. However, the lubricating oil is limited by working conditions, such as special working conditions of high and low temperature, high vacuum, strong radiation, humidity, smoke and the like, and cannot maintain a good lubricating effect.

Disclosure of Invention

The multi-element two-dimensional composite material prepared by the method endows the base material with excellent lubricating property, and can meet the lubricating requirement of materials or parts with higher lubricating requirement.

In the present invention, the carbon quantum dots are defined as: a type of dot material with semiconductor nanostructures that confine excitons in three spatial directions;

alternatively, the quantum dot size may be as small as only 2 to 10 nanometers, which corresponds to a size of 10 to 50 atomic diameters, i.e., 100 to 100,000 such atoms may be contained in one quantum dot volume. Quantum dots have the inherent property of having a large specific surface area.

In the present invention, the definition of zero-dimensional material is: materials in three dimensions in the nanoscale range or composed of them as elementary units, with dimensions in the range from 1 to 100 nm. The dimensions of zero-dimensional materials are mostly defined by textbooks and definitions to be within 100 nanometers.

In the present invention, a two-dimensional material is defined as: in particular to a layered solid material (Li et al, Superluricity between MoS) with ordered structure, growth in two-dimensional plane and ultra-thin in third dimension₂ Monolayers,Advanced Materials 2017,29(27),1701474)。

In the present invention, the ultra-long wear resistance is defined as: after long-time friction wear test, the material surface has no obvious wear and material loss.

The invention provides a multielement two-dimensional composite material, which comprises the following components: two-dimensional materials, quantum dot materials, and zero-dimensional materials;

preferably, the multicomponent two-dimensional composite material is composed of a two-dimensional material, a quantum dot material and a zero-dimensional material.

The structure of the zero-dimensional material is zero-dimensional nano particles, the average particle size of the zero-dimensional nano particles is recorded as x, and the value of x is more than 10nm and less than or equal to 55 nm.

In the multi-element two-dimensional composite material provided by the invention, the mass ratio of the two-dimensional material to the quantum dot material to the zero-dimensional material is (1-100) to (1-100);

in the multi-element two-dimensional composite material provided by the invention, the mass ratio of the two-dimensional material, the quantum dot material and the zero-dimensional material is preferably (1-10): (1-10): 1-10);

in the multi-element two-dimensional composite material provided by the invention, more preferably, the mass ratio of the two-dimensional material, the quantum dot material and the zero-dimensional material is 1:1: 1.

In the multi-element two-dimensional composite material provided by the invention, the structure of the two-dimensional material is a nanoscale lamellar structure, and the surface size is 5-500 nm;

in the multi-element two-dimensional composite material provided by the invention, the two-dimensional material is selected from one or more of two-dimensional transition metal carbide, two-dimensional transition metal nitride, molybdenum disulfide and tungsten disulfide;

in the multi-element two-dimensional composite material provided by the invention, preferably, the two-dimensional material is one or more of two-dimensional transition metal carbide or two-dimensional transition metal nitride.

In the multi-element two-dimensional composite material provided by the invention, the quantum dot material is selected from one or more of graphene quantum dots, carbon quantum dots, molybdenum disulfide quantum dots and tungsten disulfide quantum dots;

in the multi-element two-dimensional composite material provided by the invention, preferably, the quantum dot material is graphene quantum dots; optionally, the raw material of the graphene quantum dot is in a powder form or a solution form.

In the multi-element two-dimensional composite material provided by the invention, the size of the quantum dot material ranges from 2 nm to 10nm, and the interlayer spacing ranges from 0.2 nm to 0.3 nm.

In the multi-element two-dimensional composite material provided by the invention, the quantum dot material has a strong fluorescence effect and a longer fluorescence half-life period, and the inner core has an obvious two-dimensional sheet structure.

In the multielement two-dimensional composite material provided by the invention, the zero-dimensional material is selected from any one of nano diamond, nano silver and nano cubic boron nitride;

in the multi-element two-dimensional composite material provided by the invention, preferably, the zero-dimensional material is nano-diamond.

On the other hand, the invention provides a preparation method of the multielement two-dimensional composite material, which comprises the following steps:

(1) placing the substrate at the bottom of the container;

(2) respectively adding a two-dimensional material, a quantum dot material and a zero-dimensional material into a solvent and uniformly dispersing;

(3) and taking out the base material after the two-dimensional material, the quantum dot material and the zero-dimensional material are fully paved on the surface of the base material, and standing until the solvent is completely evaporated to obtain the multielement two-dimensional composite material.

Preferably, the preparation method of the multielement two-dimensional composite material consists of the steps.

In the preparation method of the multielement two-dimensional composite material provided by the invention, the preparation method is adsorbed on the base material through deposition, and is suitable for the surface of a complex special-shaped structure.

In the preparation method of the multielement two-dimensional composite material provided by the invention, the base material is one or more of metal, metal oxide, silicon, ceramic or plastic; preferably, the substrate is silicon;

in the preparation method of the multielement two-dimensional composite material, the solvent is selected from one or more of absolute ethyl alcohol, acetone, ethylene glycol and propylene glycol; preferably, the solvent is absolute ethanol.

In the preparation method of the multielement two-dimensional composite material provided by the invention, the mass concentration of the sum of the two-dimensional material, the quantum dot material and the zero-dimensional material in a solvent is 0.001mg/mL-10.0mg/mL, preferably 1-5mg/mL, and more preferably 3 mg/mL.

In the preparation method of the multielement two-dimensional composite material, the dispersion in the step (2) is ultrasonic dispersion under the condition of vacuum or inert atmosphere gas protection, wherein the ultrasonic frequency is 20-40kHz, the ultrasonic power is 100-200W, and the ultrasonic time is 30-60 min;

in the preparation method of the multielement two-dimensional composite material provided by the invention, the ultrasonic oscillation environment in the step (2) can be in an atmospheric environment or can be subjected to ultrasonic oscillation after being sealed.

In the preparation method of the multielement two-dimensional composite material provided by the invention, the standing in the step (3) is carried out under the conditions of inert atmosphere, light protection and protection at the temperature lower than 8 ℃ until the solvent is completely evaporated.

In the ultra-long wear-resistant carbon quantum dot multi-element two-dimensional composite material provided by the invention, the two-dimensional composite material, the quantum dot material and the third nano material are uniformly combined and adsorbed on the surface of the base material.

The prepared super long wear resistant carbon quantum dot multi-element two-dimensional composite material overcomes the defects of easy degradation, poor weather resistance and easy abrasion of the traditional two-dimensional solid lubricant structure, realizes the synergistic compounding of multi-element nano materials, and enables the composite material to have excellent lubricating performance and extremely low abrasion rate.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and methods described in the specification and claims.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

Fig. 1 is a cross-sectional wear curve of an ultra-long-wear-resistant graphene quantum dot (solution) multi-element two-dimensional composite material on a silicon wafer after tribology test and three-dimensional white light interference scanning test in embodiment 1 of the present application.

Fig. 2 is a cross-sectional wear curve of the ultra-long wear-resistant graphene quantum dot (powder) multi-element two-dimensional composite material, which is obtained after tribology test and three-dimensional white light interference scanning test on a silicon wafer in embodiment 2 of the present application.

Fig. 3 is a cross-sectional wear curve of the graphene multi-element two-dimensional composite material of comparative example 1 of the present application after tribology test and three-dimensional white light interference scanning test on a silicon wafer.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The embodiment of the invention provides a multi-element two-dimensional composite material, which comprises: two-dimensional materials, quantum dot materials, and zero-dimensional materials;

preferably, the multicomponent two-dimensional composite material is composed of a two-dimensional material, a quantum dot material and a zero-dimensional material.

In the embodiment of the invention, the structure of the zero-dimensional material is zero-dimensional nano particles, the average particle size of the zero-dimensional nano particles is recorded as x, and the value of x is more than 10nm and less than or equal to 55 nm.

In the embodiment of the invention, the mass ratio of the two-dimensional material, the quantum dot material and the zero-dimensional material is (1-100): (1-100): 1-100);

in the embodiment of the invention, the mass ratio of the two-dimensional material, the quantum dot material and the zero-dimensional material is preferably (1-10): (1-10): 1-10);

in the embodiment of the present invention, it is more preferable that the mass ratio of the two-dimensional material, the quantum dot material, and the zero-dimensional material is 1:1: 1.

In the embodiment of the invention, the structure of the two-dimensional material is a nanoscale lamellar structure, and the surface size is 5-500 nm;

in an embodiment of the invention, the two-dimensional material is selected from one or more of two-dimensional transition metal carbide, two-dimensional transition metal nitride, molybdenum disulfide and tungsten disulfide;

in the embodiment of the present invention, preferably, the two-dimensional material is one or more of a two-dimensional transition metal carbide or a two-dimensional transition metal nitride.

In an embodiment of the present invention, the quantum dot material is selected from one or more of graphene quantum dots, carbon quantum dots, molybdenum disulfide quantum dots, and tungsten disulfide quantum dots;

in the embodiment of the present invention, preferably, the quantum dot material is a graphene quantum dot; optionally, the raw material of the graphene quantum dot is in a powder form or a solution form.

In the embodiment of the invention, the size of the quantum dot material ranges from 2 nm to 10nm, and the interlayer spacing ranges from 0.2 nm to 0.3 nm.

In the embodiment of the invention, the quantum dot material has a strong fluorescence effect and a longer fluorescence half-life, and the inner core has an obvious two-dimensional sheet structure.

In the embodiment of the invention, the zero-dimensional material is selected from any one of nano diamond, nano silver and nano cubic boron nitride;

in the embodiment of the present invention, preferably, the zero-dimensional material is nanodiamond.

The embodiment of the invention also provides a preparation method of the multi-element two-dimensional composite material, which comprises the following steps:

(1) placing the substrate at the bottom of the container;

(2) respectively adding a two-dimensional material, a quantum dot material and a zero-dimensional material into a solvent and uniformly dispersing;

(3) and taking out the base material after the two-dimensional material, the quantum dot material and the zero-dimensional material are fully paved on the surface of the base material, and standing until the solvent is completely evaporated to obtain the multielement two-dimensional composite material.

Preferably, the preparation method of the multielement two-dimensional composite material consists of the steps.

In the embodiment of the invention, the preparation method is adsorbed on the base material through deposition, and is suitable for the surface of a complex special-shaped structure.

In the embodiment of the invention, the base material is one or more of metal, metal oxide, silicon, ceramic or plastic; preferably, the substrate is silicon;

in an embodiment of the present invention, the solvent is selected from one or more of absolute ethanol, acetone, ethylene glycol and propylene glycol; preferably, the solvent is absolute ethanol.

In the embodiment of the invention, the mass concentration of the sum of the two-dimensional material, the quantum dot material and the zero-dimensional material in the solvent is 0.001mg/mL-10.0mg/mL, preferably 1mg/mL-5mg/mL, and more preferably 3 mg/mL.

In the embodiment of the invention, the dispersion in the step (2) is ultrasonic dispersion under the condition of vacuum or inert atmosphere gas protection, wherein the ultrasonic frequency is 20-40kHz, the ultrasonic power is 100-200W, and the ultrasonic time is 30-60 min;

in the embodiment of the present invention, the ultrasonic oscillation environment in step (2) may be an atmospheric environment, or may be ultrasonic oscillation after sealing.

In the embodiment of the invention, the standing in the step (3) is carried out under the conditions of inert atmosphere, light protection and temperature protection below 8 ℃ until the solvent is completely evaporated.

In the embodiment of the invention, the two-dimensional composite material, the quantum dot material and the third nano material are uniformly combined and adsorbed on the surface of the base material.

Two-Dimensional titanium metal aluminum-doped carbides were prepared according to the method of the experimental part of the publications Naguib M, Mochalin V N, Barsum M W, et al 25th Annoverary carbide: MXenes: A New Family of Two-Dimensional Materials [ J ]. Advanced Materials,2014,26(7):992-1005.

In the embodiment of the invention, the preparation method of the two-dimensional titanium metal carbide powder comprises the following steps: and selectively stripping aluminum layer elements in the two-dimensional titanium metal aluminum-doped carbide by using a hydrofluoric acid solution, thereby obtaining the two-dimensional titanium metal carbide material. The specific reaction process is as follows:

2Ti_n+1AlC_n+6HF→2Ti_n+1C_n+2AlF₃+3H₂↑ (1-1)

2Ti_n+1C_n+2H₂O→Ti_n+1C_n(OH)₂+H₂↑ (1-2)

Ti_n+1C_n+2HF→Ti_n+1C_nF₂+H₂↑ (1-3)

wherein n is 1, 2 or 3,

the two-dimensional titanium metal aluminum-doped carbide comprises 1.0 part of aluminum powder and titanium carbide powder: 1.2: 2.0 (mass ratio of substances), the preparation method of the two-dimensional titanium metal aluminum-doped carbide comprises the steps of ball milling, drying, vacuum sintering at 1350 ℃, cooling and ball milling for 2 hours to obtain two-dimensional titanium metal aluminum-doped carbide powder; ultrasonically stripping by using 40% wt. HF solution, wherein the ultrasonic power is 200W, and the frequency is 40 kHz; and (3) doping aluminum layer elements of the two-dimensional titanium metal aluminum carbide, and etching for 24 hours to obtain the two-dimensional titanium metal carbide powder.

In an embodiment of the invention, the graphene quantum dot solution is purchased from sigma aldrich, No. 900560.

In the present example, the graphene quantum dot powder was purchased from sigma aldrich, RA 019012.

In the present example, the nanodiamond was a powder obtained from Shanghai Aladdin Biotechnology GmbH under the designation N140011.

Example 1

Firstly, gently placing a silicon wafer at the bottom of a glass beaker, and adding 10mL of absolute ethyl alcohol into the glass beaker; then will 30mg of two-dimensional titanium metal carbide powder, graphene quantum dot solution with the weight of 2mg of graphene quantum dots and 30mg of nano diamond powder are respectively and slowly added into a beaker filled with absolute ethyl alcohol; sealing the beaker, carrying out ultrasonic oscillation for 1 hour at room temperature (the ultrasonic frequency is 40kHz, the ultrasonic power is 200W), and then standing for 24 hours at room temperature to ensure that all materials in the beaker are deposited on the surface of a silicon wafer to obtain a semi-finished product of the multi-element two-dimensional composite material of the ultra-long wear-resistant graphene quantum dots (solution); and lightly clamping the obtained multi-element two-dimensional composite semi-finished product of the ultra-long wear-resistant graphene quantum dot (solution) from the beaker by using forceps, placing the semi-finished product in an inert atmosphere in the dark under the protection of the temperature lower than 8 ℃, standing the semi-finished product until absolute ethyl alcohol is completely volatilized, and thus obtaining the multi-element two-dimensional composite of the ultra-long wear-resistant graphene quantum dot. After tribology testing, the wear rate is 6.5 multiplied by 10^-7mm³·N^-1·m^-1。

Example 2

Firstly, gently placing a silicon wafer at the bottom of a glass beaker, and adding 10mL of absolute ethyl alcohol into the glass beaker; then slowly adding 30mg of two-dimensional titanium metal carbide powder, 30mg of graphene quantum dot powder and 30mg of nano diamond powder into a beaker filled with absolute ethyl alcohol respectively; sealing the beaker, carrying out ultrasonic oscillation for 1 hour at room temperature (the ultrasonic frequency is 40kHz, the ultrasonic power is 200W), and then standing for 24 hours at room temperature to ensure that all materials in the beaker are deposited on the surface of a silicon wafer to obtain a semi-finished product of the multi-element two-dimensional composite material of the ultra-long wear-resistant graphene quantum dots (powder); gently clamping the obtained multi-element two-dimensional composite material semi-finished product of the ultra-long wear-resistant graphene quantum dot (powder) from the beaker by using forceps, placing the semi-finished product in an inert atmosphere in the dark under the protection of a temperature lower than 8 ℃, standing the semi-finished product until absolute ethyl alcohol is completely volatilized, and obtaining the multi-element two-dimensional composite material of the ultra-long wear-resistant graphene quantum dot. After tribology testing, the wear rate is 5.5 multiplied by 10^-7mm³·N^-1·m^-1。

Comparative example 1

Firstly, gently placing a silicon wafer at the bottom of a glass beaker, and adding 10mL of absolute ethyl alcohol into the glass beaker; then 30mg of two-dimensional titanium metal carbide powder and 30mg of sodium are addedRespectively and slowly adding rice graphene powder (sheet surface size of graphene powder is 5-500nm) (Shanghai Aladdin Biotechnology GmbH, G139804) and 30mg nanometer diamond powder into a beaker containing absolute ethanol; sealing the beaker, carrying out ultrasonic oscillation for 1 hour at room temperature (the ultrasonic frequency is 40kHz, the ultrasonic power is 200W), and then standing for 24 hours in a room temperature environment to ensure that all materials in the beaker are deposited on the surface of a silicon wafer to obtain a semi-finished product of the two-dimensional material graphene composite material; and lightly clamping the obtained two-dimensional material graphene composite material semi-finished product out of the beaker by using a pair of tweezers, placing the semi-finished product in an inert atmosphere, keeping out of the sun, standing the semi-finished product at the temperature lower than 8 ℃ under protection, and obtaining the two-dimensional material/graphene when absolute ethyl alcohol is completely volatilized. After tribology testing, the wear rate is 1.26 multiplied by 10^-5mm³·N^-1·m^-1。

Comparative example 2

Firstly, gently placing a silicon wafer at the bottom of a glass beaker, and adding 10mL of absolute ethyl alcohol into the glass beaker; then slowly adding 30mg of two-dimensional titanium metal carbide powder and 30mg of nano diamond powder into a beaker filled with absolute ethyl alcohol respectively; sealing the beaker, carrying out ultrasonic oscillation for 1 hour at room temperature (the ultrasonic frequency is 40kHz, the ultrasonic power is 200W), and then standing for 24 hours at room temperature, so that all materials in the beaker are deposited on the surface of the silicon wafer, and a semi-finished product of the two-dimensional material/nano-diamond composite material is obtained; and lightly clamping the obtained semi-finished product of the two-dimensional material/nano-diamond composite material from the beaker by using forceps, placing the semi-finished product in an inert atmosphere, keeping out of the sun, standing the semi-finished product at the temperature of lower than 8 ℃ under the protection of the temperature, and obtaining the two-dimensional material/nano-diamond after the absolute ethyl alcohol is completely volatilized. After tribology test, the wear rate is 2.81 multiplied by 10^-5mm³·N^-1·m^-1。

Performance testing

The friction and wear test is performed on the ultra-long wear-resistant carbon quantum dot multi-element two-dimensional composite material prepared in the example 1, an adopted instrument is a controllable environment friction and wear instrument (CETR company, U.S. Pat. No. 3), the test mode is reciprocating type, and parameters are as follows: the load was 1N, the frequency was 2Hz, the test temperature was room temperature and the humidity was 10%. The cycle is 14400 times.

The surface morphology of the ultra-long wear-resistant carbon quantum dot multi-element two-dimensional composite material prepared in example 1 was tested by using a three-dimensional optical surface profiler (ZYGO, Inc. of America, New View)^TM8000)。

The curve in fig. 1 shows the surface wear scar morphology of the silicon wafer substrate prepared in example 1 after a rubbing experiment, and a plurality of roughness peaks at 1450 μm on the abscissa are caused by the accumulation of the multi-component two-dimensional composite material and do not show the abrasion of the surface of the silicon wafer substrate. The test result shows that the wear rate of the surface of the silicon wafer is extremely low.

Example 2 and comparative example 1 the frictional wear test and topographical characterization were performed according to the test method of example 1, and the test results are detailed in fig. 2 and 3.

The graph in FIG. 2 shows the surface wear scar morphology of the silicon wafer substrate obtained in example 2 after the rubbing test, and it can be seen from the graph that the roughness peaks at the abscissa 50 μm and 1450 μm are caused by the accumulation of the multi-component two-dimensional composite material, and do not show the wear of the silicon wafer substrate surface. The test result shows that the wear rate of the surface of the silicon wafer is extremely low.

The curve in fig. 3 shows the surface grinding trace morphology of the silicon wafer substrate prepared in comparative example 1 after a friction experiment, and it can be seen from the graph that a relatively obvious grinding trace is formed in the range of 750 μm to 1050 μm on the abscissa, which indicates that the composite material lacking the graphene quantum dots has obvious material wear and poor interface lubrication performance.

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.