CN107930778B - Graphene physical stripping production method and produced graphene - Google Patents
Graphene physical stripping production method and produced graphene Download PDFInfo
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- CN107930778B CN107930778B CN201711038875.0A CN201711038875A CN107930778B CN 107930778 B CN107930778 B CN 107930778B CN 201711038875 A CN201711038875 A CN 201711038875A CN 107930778 B CN107930778 B CN 107930778B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000000498 ball milling Methods 0.000 claims description 53
- 239000000843 powder Substances 0.000 claims description 39
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 38
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 claims description 37
- 229910002804 graphite Inorganic materials 0.000 claims description 32
- 239000010439 graphite Substances 0.000 claims description 32
- 239000010410 layer Substances 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 11
- 229910052725 zinc Inorganic materials 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 10
- 239000002356 single layer Substances 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 239000010963 304 stainless steel Substances 0.000 claims description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/06—Selection or use of additives to aid disintegrating
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2204/00—Structure or properties of graphene
- C01B2204/04—Specific amount of layers or specific thickness
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2204/00—Structure or properties of graphene
- C01B2204/20—Graphene characterized by its properties
- C01B2204/32—Size or surface area
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides a physical stripping production method of graphene and the graphene produced by the method. The whole production process is simple to operate and no pollutant is generated.
Description
Technical Field
The invention relates to a physical stripping production method of graphene and the graphene produced by the method.
Background
The graphene is a two-dimensional crystal, carbon atoms are distributed according to hexagons and are mutually connected to form a carbon molecule, and the structure of the graphene is very stable; as the number of attached carbon atoms increases, the two-dimensional plane of the carbon molecule increases and the molecule increases. The thickness of single-layer graphene is only one carbon atom, namely 0.335 nanometers, which is equivalent to 20 parts per million of the thickness of one hair, and about 150 ten thousand layers of graphene are in the graphite with the thickness of 1 millimeter. Graphene is the thinnest known material and has the advantages of extremely high specific surface area, super-strong conductivity, strength and the like. The advantages exist in that the method has good market prospect.
However, the method of the prior art capable of realizing industrial production is mainly realized by CVD (chemical vapor deposition), and a large-area, continuous, transparent and high-conductivity few-layer graphene film can be manufactured by the chemical vapor deposition, and is mainly used for the anode of a photovoltaic device, and the energy conversion efficiency is as high as 1.71%; compared with the element made of the indium tin oxide material, the energy conversion efficiency of the element is about 55.2%, the element has the defects of high production difficulty and high production cost, and the graphene is difficult to be widely used, and the process for producing the graphene by a low-cost physical method is researched, so that the element has revolutionary significance.
The graphene is obtained by repeatedly sticking and tearing the adhesive tape, and the friction method and the CVD method are low in efficiency or high in production cost, so that the popularization of the application of the graphene is not facilitated.
Disclosure of Invention
The invention provides a graphene physical stripping production method which is simple to operate, low in production cost and beneficial to quick popularization of graphene.
The invention relates to a physical stripping production method of graphene, which comprises the steps of taking high-purity flake graphite as a raw material for producing graphene, taking steel balls and zinc-magnesium alloy powder as ball milling stripping media, putting the flake graphite and the ball milling stripping media into a ball mill, performing ball milling stripping under the protection of inert gas, and after stripping, separating out the ball milling stripped graphene flakes by air flow in a grading manner by utilizing the characteristic of large specific gravity difference between the graphene flakes and the ball milling stripping media. The steel balls are preferably 304 stainless steel balls.
Further, in the ball milling stripping medium, the diameter of the stainless steel ball is 0.4-1.0mm, preferably 0.6-0.8mm, the weight ratio of the stainless steel ball in the ball milling stripping medium is 10-30%, preferably 15-25%, more preferably 18-22%,
the weight ratio of zinc-magnesium alloy powder in the ball milling stripping medium is 70-90%, preferably 75-85%, more preferably 78-82%, and the particle size range is 7-17 μm, preferably 9-11 μm.
The zinc-magnesium alloy powder is preferably spherical.
Further, in the zinc-magnesium alloy powder, the zinc mass ratio is 50-90%, the magnesium mass ratio is 10-50%, preferably, the zinc mass ratio is 60-80%, the magnesium mass ratio is 20-40%, more preferably, the zinc mass ratio is 60-70%, and the magnesium mass ratio is 30-40%.
The inert gas blanket is for example in an inert gas atmosphere, preferably in a nitrogen atmosphere, having an oxygen content of less than 0.8% by volume.
Further, the average particle diameter D50 of the flaky graphite is 5 to 10 μm, preferably 6 to 8 μm, D100 < 25 μm, the graphite content is > 99.5% by mass, more preferably > 99.8% by mass, and the weight of the flaky graphite is 7.5% or less, preferably 3 to 7% or even 4.0 to 5.0%, more preferably 4.5% of the ball-milling stripping medium.
Further, the ball-milling stripping temperature is 110 to 155 ℃, preferably 120 to 150 ℃, and the ball-milling stripping time is 150 to 400 hours, preferably 200 to 300 hours. The graphene sheets can be exfoliated thinner using this temperature and time.
Further, the oxygen content of the atmosphere in the ball mill is controlled to be between 0.2 and 0.6 volume percent, the nitrogen protection pressure is between 5 and 15KPa, preferably between 6 and 10kPa, and the oxygen content in the atmosphere environment is reduced, so that the graphene sheets are not oxidized in the stripping process, and the graphene sheets are better stripped.
In one embodiment, the ball mill is a 2000mm x 3500mm stainless steel (304) ball mill rotating speed 50-55 rpm and is stripped using a pressure ball mill of 6-10 kPa.
The invention further relates to graphene obtained by the physical exfoliation method of graphene, wherein the average particle size of graphene flakes is 3-8 μm, preferably 3-7 μm, more preferably 3-6 μm, and the average thickness is 0.33-3nm, preferably 0.33-2nm, more preferably 0.33-1.5nm; the graphene flake is completely transparent after peeling and is processed into 1-10 layers of graphene, preferably 1-5 layers or less.
The invention has the beneficial effects that:
(1) According to the method, the spherical zinc-magnesium alloy powder is creatively added into a ball mill to serve as most of ball milling stripping media, a small amount of traditional steel ball media are added to increase kinetic energy, the defect of kinetic energy of alloy powder is overcome, the method for obtaining the graphene thin layer material by friction rolling and relative movement among the zinc-magnesium alloy powder, the steel balls and the flaky graphite is utilized, meanwhile, graphene can be stripped to be thinner, the single-layer rate is high, the obtained graphene generally maintains a complete crystal structure, the processing technology is spanned into nanoscale processing, the zinc-magnesium alloy has the characteristics of good flowability, good toughness and good gloss, and because graphene sheets are quite easy to fall off, one or more layers of graphene can be stripped out after each impact of the alloy powder and the flaky graphite is carried out along with the driving of the kinetic energy of the steel balls, the situation of stripping is caused in which a plurality of times of re-stripping occurs in the stripping process, and the stripped multi-layer graphene sheets and the alloy powder are stripped again into single-layer or double-layer graphene sheets when the stripped multi-layer graphene sheets collide again.
(2) The graphene sheet can be peeled again in a plurality of times in the peeling process, when the peeled multi-layer graphene sheet collides with alloy powder again, the peeled multi-layer graphene sheet can be peeled again into a single-layer or double-layer graphene sheet, the zinc-magnesium alloy used in ball milling peeling has the characteristics of good fluidity, good toughness and good gloss, the service life of the zinc-magnesium alloy is long, the alloy powder can be repeatedly used, the phenomenon of crushing and abrasion basically does not occur, the graphene sheet is completely different from the existing graphene production process, the graphene sheet is processed by a physical peeling method, the graphene sheet exists in a completely powdery form, the storage and use environment is not limited, the industrialized production cost is lower, the graphene is convenient to be widely applied to various industries, and the graphene processing industry is a revolution.
Drawings
Fig. 1 is a graph showing the influence of the fineness of zinc-magnesium alloy powder on the thickness of graphene sheets.
Fig. 2 is a graph showing the effect of the purity of the raw material flake graphite on the thickness of the graphene flake.
Detailed Description
The invention is further described below in connection with the detailed description.
In the following embodiments, the ball mill is made of 2000mm x 3500mm stainless steel (304), the rotation speed of the ball mill is 50-55 r/min, and the pressure of the ball mill is 6-10kPa for ball milling and stripping.
Example 1
Adding a ball milling medium consisting of a flaky graphite with an average particle diameter D50 of 6-8 mu m, a D100 of less than 25 mu m and a graphite content of more than 99.5%, spherical zinc-magnesium alloy powder with a zinc content of 9 mu m-11 mu m (in zinc-magnesium alloy, the zinc content is 70wt%, the magnesium content is 30 wt%) and stainless steel balls with a diameter of 0.6mm-0.8mm into a ball mill, wherein the weight ratio of the stainless steel balls to the zinc-magnesium alloy powder is shown in the following table 1, the weight of the flaky graphite is 4.5% of a ball milling stripping medium (the sum of the steel balls and the zinc-magnesium alloy powder), the ball milling stripping is carried out in a nitrogen atmosphere with an atmospheric oxygen content of less than 0.8%, the nitrogen pressure is 6-10kPa, the ball milling stripping time is 200-300 hours, and after the ball milling stripping is finished, the graphene sheets are separated by air flow classification for multiple times under the protection, and accurately classifying the ball milling stripping time by using a closed system, and using 4 stages 30 four-wheel graders, wherein the rotating speed of each grader is kept at 0/0 m and the rotating speed of 4-25 m and the graphene sheets are kept as good layers, and equal to be equal to 2-10 seconds, and equal to 20 seconds, and finally, and the graphene sheets can be separated as good and quality products. The average particle diameter and average thickness of the resulting graphene sheet product are shown in the following table.
TABLE 1
As can be seen from Table 1, the ratio of 20% steel ball to 80% zinc-magnesium alloy powder is optimal, the graphene sheet is peeled to the optimal state, the single layer rate is highest, the proper range is 70-90% zinc-magnesium alloy powder weight and the weight range of steel ball is 10-30%.
Example 2
Adding flaky graphite with an average particle diameter D50 of 6-8 mu m, D100 of less than 25 mu m and a graphite content of more than 99.5%, and a ball milling stripping medium consisting of spherical zinc-magnesium alloy powder with a particle diameter of 9-11 mu m and stainless steel balls with a diameter of 0.6-0.8mm into a ball mill, wherein the weight of the steel balls is 20%, the weight of the zinc-magnesium alloy powder is 80% and the proportion of zinc and magnesium in the zinc-magnesium alloy powder is as follows relative to the total weight of the ball milling medium: the mass ratio of zinc is 70%, and the mass ratio of magnesium is 30%.
The weight of the flake graphite and the weight ratio of the ball milling stripping medium (sum of steel balls and zinc magnesium alloy powder) are shown in table 2, the rotating speed of a ball mill is 50-55 r/min, the temperature is 120-150 ℃, ball milling stripping is carried out in a nitrogen atmosphere with the atmosphere oxygen content lower than 0.8%, the nitrogen pressure is 6-10kPa, the ball milling stripping time is 200-300 hours, after the ball milling stripping is finished, the graphene sheets subjected to ball milling stripping are separated through air flow classification under the protection of inert gas, then the air flow is used for multiple accurate classification, a classification system is a closed system, 4-30 KW four-in-one air flow graders are adopted, the rotating speed of each grader is kept 9000 r/min, the air speed is kept at 22-25 m/s, 1-2 layers of graphene sheets can be separated singly as special products, 2-5 layers of graphene sheets are separated as excellent products, 4-10 layers of graphene sheets are used as second products, and finally more than 10 layers of graphene sheets are uniformly separated into inferior products. The average particle diameter and average thickness of the resulting graphene sheet product are shown in the following table.
TABLE 2
As can be seen from Table 2, the addition amount of the flaky graphite raw material is about 4.5% by weight, preferably 3%, 4.5% and 7% by weight, based on the total weight of the ball-milling stripping medium.
Example 3
Adding flaky graphite with an average particle diameter D50 of 6-8 mu m, D100 < 25 mu m and a graphite content of more than 99.5%, a ball milling medium consisting of 9 mu m-11 mu m spherical zinc-magnesium alloy powder and stainless steel balls with a diameter of 0.6mm-0.8mm into a ball mill, wherein the weight of the steel balls is 20% and the weight of the zinc-magnesium alloy powder is 80% relative to the total weight of the ball milling medium, the weight of the flaky graphite is about 4.5% of ball milling stripping medium (the sum of the steel balls and the zinc-magnesium alloy powder), the rotating speed of the ball mill is 50-55 rpm, the temperature is 120-150 ℃, the ball milling stripping is performed in a nitrogen atmosphere with an atmosphere oxygen content of less than 0.8%, the nitrogen pressure is 6-10kPa, the ball milling stripping time is 200-300 hours, after ball milling stripping, the ball milling stripped graphene sheets are separated through air flow grading under the protection of inert gas, then the ball milling stripped graphene sheets are precisely graded through air flow for a plurality of times, a grading system is a closed system, 4 30KW four-in-one air flow graders are adopted, the rotating speed of a grading wheel of each grader is kept 9000 r/min, the air speed is kept at 22-25 m/s, 1-2 layers of graphene sheets can be separated out to be used as special products, 2-5 layers of graphene sheets are separated out to be used as excellent products, 4-10 layers of graphene sheets are used as second products, and finally the graphene sheets with the size larger than 10 layers are uniformly separated into inferior products. The average particle diameter and average thickness of the resulting graphene sheet product are shown in table 3 below.
TABLE 3 Table 3
As can be seen from Table 3, the zinc and magnesium alloy powder has the best effect when the mass ratio of zinc to magnesium is suitably 50-90:50-10 and 60-70:30-40.
Example 4
Similar to example 1, except that the ratio of the steel balls to the zinc-magnesium alloy powder was changed by 20% to 80%, the particle size of the zinc-magnesium alloy powder in the ball milling stripping medium was changed, and the result is shown in fig. 1.
As can be seen from FIG. 1, the effect is best when the particle size of the ball-milled exfoliated zinc-magnesium alloy powder is 9-11 μm, and 7-17 μm are all suitable.
Example 5
Similar to example 1, except that the ratio of steel balls to zinc magnesium alloy powder was changed by 20% to 80%, the fineness of the raw material flake graphite was changed, and the results are shown in table 4.
TABLE 4 Table 4
As shown in Table 4, the average particle diameter D50 of the raw material flaky graphite is preferably 5 to 10. Mu.m, more preferably 6 to 8. Mu.m, and the flaky graphite having D100 < 25. Mu.m, as a raw material, gives the highest monolayer rate of the processed graphene flakes.
Example 6
The purity of the raw material flake graphite was changed as in example 1 except that the ratio of steel balls to zinc magnesium alloy powder was 20% and 80%, and the result is shown in fig. 2.
As seen from fig. 2, the higher the purity of the flake graphite, the higher the monolayer ratio of the graphene sheet, and the graphite content is preferably > 99.5 mass%, more preferably >99.8 mass%.
The invention is completely produced by a dry method, inert gas is used for protection in the whole production process, physical method ball milling stripping is adopted, no pollutant is discharged in production, and the finished graphene has wide application range and can be used as a representative new material in the future photoelectric industry.
Claims (14)
1. A physical stripping production method of graphene is characterized in that the method comprises taking high-purity flake graphite as raw material for producing graphene, taking steel balls and zinc-magnesium alloy powder as ball milling stripping media, putting the flake graphite and the ball milling stripping media into a ball mill, performing ball milling stripping under the protection of inert gas, grading and separating out graphene flakes after ball milling stripping under the protection of inert gas after stripping,
wherein the ball milling stripping temperature is 120-150 ℃, the ball milling stripping time is 200-300 hours,
the average grain diameter D50 of the flaky graphite is 5-10mm, the D100 is less than 25mm, the graphite content is more than 99.5 percent, the weight of the flaky graphite is below 7.5 percent of the ball milling stripping medium,
in the ball milling stripping medium, the diameter of the stainless steel ball is 0.4-1.0mm, the weight ratio of the stainless steel ball in the ball milling stripping medium is 10-30%,
the particle size range of the zinc-magnesium alloy powder is 7-17mm, and the weight ratio of the zinc-magnesium alloy powder in the ball milling stripping medium is 70-90%.
2. The method of claim 1, wherein the steel ball is a 304 stainless steel ball.
3. The method according to claim 1, wherein the diameter of the stainless steel balls in the ball milling stripping medium is 0.6-0.8mm, the weight of the stainless steel balls in the ball milling stripping medium is 15-25%,
the particle size range of the zinc-magnesium alloy powder is 9-11mm, and the weight ratio of the zinc-magnesium alloy powder in the ball milling stripping medium is 75-85%.
4. A method according to any one of claims 1-3, characterized in that the zinc magnesium alloy powder is spherical.
5. A method according to any one of claims 1 to 3, characterized in that the zinc-magnesium alloy powder has a zinc mass ratio of 50 to 90% and a magnesium mass ratio of 10 to 50%.
6. A method according to any one of claims 1 to 3, characterized in that the zinc-magnesium alloy powder has a zinc mass ratio of 60 to 80% and a magnesium mass ratio of 20 to 40%.
7. A method according to any one of claims 1 to 3, characterized in that the zinc-magnesium alloy powder has a zinc mass ratio of 60 to 70% and a magnesium mass ratio of 30 to 40%.
8. A method according to any one of claims 1-3, characterized in that the inert gas protection is in an inert gas atmosphere having an oxygen content below 0.8 vol%.
9. The method of claim 8, wherein the inert gas blanket is in a nitrogen atmosphere.
10. A method according to any one of claims 1 to 3, wherein the weight of the graphite flakes is 3 to 7% of the weight of the ball milling stripping medium.
11. A method according to any one of claims 1 to 3, wherein the weight of the graphite flakes is 4 to 5% of the weight of the ball milling stripping medium.
12. A method according to any one of claims 1-3, characterized in that the atmospheric oxygen content in the ball mill is controlled between 0.2-0.6 vol% and the nitrogen protection pressure is 5-15KPa.
13. Graphene produced by the method of any one of claims 1-12, wherein the graphene platelets have an average particle size of 3-8mm and an average thickness of 0.33-3nm; the peeled graphene sheet is completely transparent, and the graphene sheet is 1-10 layers of single-layer graphene.
14. The graphene according to claim 13, wherein the graphene flakes have an average particle size of 3-6mm and an average thickness of 0.33-1.5nm; the peeled graphene sheet is completely transparent, and the graphene sheet is 1-5 layers of single-layer graphene.
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| CN110078062A (en) * | 2019-05-22 | 2019-08-02 | 大同墨西科技有限责任公司 | A kind of graphene energetic catalytic physics strip preparation method |
| CN113620280A (en) * | 2021-08-28 | 2021-11-09 | 湖南晨智纳米材料科技有限公司 | Graphene powder gas-phase physical stripping method and produced graphene |
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