Preparation method of two-dimensional material nano ink

Abstract

The invention relates to a preparation method of two-dimensional material nano ink, and belongs to the technical field of ink preparation. The preparation method comprises the following steps: firstly, mixing a two-dimensional material with a compound dispersant and a solvent, carrying out ultrasonic treatment by adopting an ultrasonic-ball milling synergistic dispersion method, and then carrying out ball milling to obtain a uniform dispersion liquid; sequentially adding a rheology modifier, a silane coupling agent and a drying accelerator into the dispersion liquid, and stirring and mixing to form a primary ink system; then, circularly homogenizing the primary printing ink system in a high-pressure homogenizer; and finally, filtering by using a nano filtering membrane to prepare the high-quality two-dimensional material nano printing ink. The nano oil prepared by the invention has no obvious agglomeration and precipitation phenomena, and the dispersion stability of the ink is good; meanwhile, the ink is high in adhesive force, and the fineness reaches the nanoscale.

Description

Technical Field

[0001] The present invention relates to the technical field of ink preparation, in particular to a method for preparing two-dimensional material nano ink. Background Art

[0002] Two-dimensional material nanoinks hold broad application prospects in modern high-tech fields. However, current preparation methods suffer from numerous shortcomings. For one thing, the dispersion process of the two-dimensional materials used in traditional preparation methods is inefficient, leading to severe material agglomeration and compromising the uniformity and stability of the ink. Furthermore, the order of additive addition and mixing methods lack scientific design during ink formulation, making it difficult to achieve ideal key properties such as rheological properties and adhesion. Furthermore, the lack of effective impurity removal during the preparation process further reduces ink quality. These issues severely restrict the development and application of two-dimensional material nanoinks. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a method for preparing a two-dimensional material nano-ink, the operating steps of which are as follows:

[0004] S1 2D material dispersion: Add 5-15 parts of 2D material and 2-8 parts of dispersant to 60-80 parts of solvent, and use ultrasonic-ball milling synergistic dispersion method; first, ultrasonicate at 200-500W power for 15-60 minutes to initially break up 2D material agglomerates by ultrasonic cavitation; then transfer to a ball mill and ball mill at 300-800r / min for 2-6 hours. The collision and friction of the grinding balls further refine the 2D material and enhance the dispersion effect, thus obtaining a uniform 2D material dispersion;

[0005] S2 ink preparation: Add 1-5 parts of rheology modifier, 1-3 parts of adhesion promoter, and 1-3 parts of drying accelerator to the two-dimensional material dispersion in sequence, maintaining a stirring speed of 300-800 r / min during the addition process; continue stirring for 10-30 minutes after adding each additive to ensure that the additive is fully dissolved and evenly mixed with the dispersion to form a preliminary ink system;

[0006] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and homogenized 2-5 times at a pressure of 100-300 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0007] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.05-0.5μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0008] Furthermore, the two-dimensional material is thiophene-modified graphene, and its preparation method is:

[0009] K1: Disperse 15-30 parts of graphene with a particle size of 5-10 μm in 150-300 mL of a 0.15-0.5 mol / L NaOH solution, and perform ultrasonic dispersion for 40-100 minutes to ensure uniform dispersion of the graphene; then, add 2-5 parts of allyl glycidyl ether and 0.3-0.8 parts of 2-(2,3-epoxypropylthio)thiophene, and stir at 70-80° C. for 1-4 hours;

[0010] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain thiophene-modified graphene.

[0011] Furthermore, the dispersant is a compound of a surfactant and a polymer, wherein the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1-2; the surfactant is sodium dodecylbenzenesulfonate or sodium dodecyl sulfate; and the polymer is polyvinylpyrrolidone or sodium polystyrenesulfonate.

[0012] Furthermore, the solvent is one of water, ethanol, N-methylpyrrolidone and dimethyl sulfoxide.

[0013] Furthermore, the rheology regulator is sodium carboxymethyl cellulose or hydroxyethyl cellulose.

[0014] Furthermore, the adhesion promoter is silane coupling agent KH-550.

[0015] Furthermore, the drying accelerator is propylene glycol or ethylene glycol.

[0016] Reaction mechanism

[0017] In the preparation of thiophene-modified graphene, the first step is to activate the graphene surface. The surface hydroxyl groups are deprotonated to generate graphene-O - Na + , which improves the reaction activity. Then, the epoxy groups of allyl glycidyl ether and 2-(2,3-epoxypropylthio)thiophene are reacted with graphene-O - Nucleophilic attack ring opening. Allyl glycidyl ether forms an ether bond to the allyl group after ring opening, and 2-(2,3-epoxypropylthio)thiophene forms a thioether bond to the thiophene group after ring opening.

[0018] Technical Effects

[0019] The present invention provides a method for preparing a two-dimensional material nano-ink. Compared with the prior art, the present invention has the following significant effects:

[0020] 1. Strong Functionality: The introduction of thiophene-modified graphene imparts excellent electrical and optical properties to the ink, making it suitable for high-frequency circuit printing. Furthermore, the light absorption properties of the thiophene group give the ink both electrical conductivity and photoresponsiveness, making it suitable for applications such as light-controlled sensors.

[0021] 2. Good environmental adaptability: The thio group of thiophene-modified graphene improves the weather resistance of the ink and extends the service life of the ink. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention object, the following is a detailed description in conjunction with examples and comparative examples:

[0023] 1. Fineness and adhesion test: Determine in accordance with QB / T1046-2012.

[0024] 2. Dispersion stability test: After the ink is placed for 6 months, check whether there is obvious agglomeration and precipitation.

[0025] Example 1

[0026] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0027] S1 2D material dispersion: 5g of 2D material and 2g of dispersant were added to 60g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 200W for 15 minutes to initially break up the 2D material agglomerates using the cavitation effect of ultrasound. The mixture was then transferred to a ball mill and ball milled at 300r / min for 2 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0028] S2 ink preparation: add 1g of rheology modifier, 1g of adhesion promoter, and 1g of drying promoter to the 2D material dispersion in sequence, maintaining a stirring speed of 300r / min during the addition process; continue stirring for 10 minutes after adding each additive to ensure that the additive is fully dissolved and evenly mixed with the dispersion to form a preliminary ink system;

[0029] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and subjected to two cycles of homogenization at a pressure of 100 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0030] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.5 μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0031] The two-dimensional material is thiophene-modified graphene, and its preparation method is:

[0032] K1: Disperse 15 g of graphene with a particle size of 10 μm in 150 mL of 0.15 mol / L NaOH solution and perform ultrasonic dispersion for 40 minutes to ensure uniform dispersion of the graphene; then, add 2 g of allyl glycidyl ether and 0.3 g of 2-(2,3-epoxypropylthio)thiophene (CAS No. 57713-44-7) and stir at 70°C for 1 hour;

[0033] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain thiophene-modified graphene.

[0034] The dispersant is a compound of a surfactant and a polymer, and the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1; the surfactant is sodium dodecylbenzenesulfonate; and the polymer is polyvinylpyrrolidone.

[0035] The solvent is water.

[0036] The rheology regulator is sodium carboxymethyl cellulose.

[0037] The adhesion promoter is silane coupling agent KH-550.

[0038] The drying accelerator is propylene glycol.

[0039] Example 2

[0040] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0041] S1 2D material dispersion: 8g of 2D material and 4g of dispersant were added to 65g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 300W for 30 minutes to initially break up 2D material agglomerates by the cavitation effect of ultrasound. The mixture was then transferred to a ball mill and ball milled at 400r / min for 3 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0042] S2 ink preparation: 2g of rheology modifier, 2g of adhesion promoter, and 2g of drying accelerator were added to the 2D material dispersion in sequence, with the stirring speed maintained at 500r / min. After each additive was added, stirring was continued for 15 minutes to ensure that the additive was fully dissolved and evenly mixed with the dispersion to form a preliminary ink system.

[0043] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and homogenized three times at a pressure of 200 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0044] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.3μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0045] The two-dimensional material is thiophene-modified graphene, and its preparation method is:

[0046] K1: Disperse 20 g of graphene with a particle size of 8 μm in 200 mL of 0.3 mol / L NaOH solution and perform ultrasonic dispersion for 60 minutes to ensure uniform dispersion of the graphene; then, add 3 g of allyl glycidyl ether and 0.4 g of 2-(2,3-epoxypropylthio)thiophene (CAS No. 57713-44-7) and stir at 75°C for 2 hours;

[0047] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain thiophene-modified graphene.

[0048] The dispersant is a compound of a surfactant and a polymer, wherein the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1.5; the surfactant is sodium dodecylbenzenesulfonate; and the polymer is polyvinylpyrrolidone.

[0049] The solvent is ethanol.

[0050] The rheology regulator is sodium carboxymethyl cellulose.

[0051] The adhesion promoter is silane coupling agent KH-550.

[0052] The drying accelerator is propylene glycol.

[0053] Example 3

[0054] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0055] S1 2D material dispersion: 13g of 2D material and 6g of dispersant were added to 75g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 400W for 45 minutes to initially break up 2D material agglomerates by ultrasonic cavitation. The mixture was then transferred to a ball mill and ball milled at 700r / min for 5 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0056] S2 ink preparation: 4g of rheology modifier, 4g of adhesion promoter, and 4g of drying accelerator were added to the 2D material dispersion in sequence, maintaining a stirring speed of 700r / min during the addition process; stirring was continued for 25 minutes after each additive was added to ensure that the additive was fully dissolved and evenly mixed with the dispersion to form a preliminary ink system;

[0057] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and homogenized four times at a pressure of 200 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0058] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.1 μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0059] The two-dimensional material is thiophene-modified graphene, and its preparation method is:

[0060] K1: Disperse 25 g of graphene with a particle size of 6 μm in 250 mL of 0.4 mol / L NaOH solution and perform ultrasonic dispersion for 80 minutes to ensure uniform dispersion of the graphene; then, add 4 g of allyl glycidyl ether and 0.7 g of 2-(2,3-epoxypropylthio)thiophene (CAS No. 57713-44-7) and stir at 75°C for 3 hours;

[0061] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain thiophene-modified graphene.

[0062] The dispersant is a compound of a surfactant and a polymer, wherein the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1.5; the surfactant is sodium lauryl sulfate; and the polymer is sodium polystyrene sulfonate.

[0063] The solvent is N-methylpyrrolidone.

[0064] The rheology regulator is hydroxyethyl cellulose.

[0065] The adhesion promoter is silane coupling agent KH-550.

[0066] The drying accelerator is ethylene glycol.

[0067] Example 4

[0068] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0069] S1 2D material dispersion: 15g of 2D material and 8g of dispersant were added to 80g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 500W for 60 minutes to initially break up 2D material agglomerates by ultrasonic cavitation. The mixture was then transferred to a ball mill and ball milled at 800r / min for 6 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0070] S2 ink preparation: 5g of rheology modifier, 3g of adhesion promoter, and 3g of drying accelerator were added to the 2D material dispersion in sequence, with the stirring speed maintained at 800r / min. After each additive was added, stirring was continued for 30 minutes to ensure that the additive was fully dissolved and evenly mixed with the dispersion to form a preliminary ink system.

[0071] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and homogenized five times at a pressure of 300 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0072] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.05m to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0073] The two-dimensional material is thiophene-modified graphene, and its preparation method is:

[0074] K1: 30 g of graphene with a particle size of 5 μm was dispersed in 300 mL of a 0.5 mol / L NaOH solution and ultrasonically dispersed for 100 minutes to ensure uniform dispersion of the graphene; then, 5 g of allyl glycidyl ether and 0.8 g of 2-(2,3-epoxypropylthio)thiophene (CAS No. 57713-44-7) were added and stirred at 80°C for 4 hours;

[0075] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain thiophene-modified graphene.

[0076] The dispersant is a compound of a surfactant and a polymer, wherein the surfactant and the polymer are uniformly mixed in a mass ratio of 1:2; the surfactant is sodium lauryl sulfate; and the polymer is sodium polystyrene sulfonate.

[0077] The solvent is dimethyl sulfoxide.

[0078] The rheology regulator is hydroxyethyl cellulose.

[0079] The adhesion promoter is silane coupling agent KH-550.

[0080] The drying accelerator is ethylene glycol.

[0081] Comparative Example 1

[0082] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0083] S1 2D material dispersion: 5g of 2D material and 2g of dispersant were added to 60g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 200W for 15 minutes to initially break up the 2D material agglomerates using the cavitation effect of ultrasound. The mixture was then transferred to a ball mill and ball milled at 300r / min for 2 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0084] S2 ink preparation: add 1g of rheology modifier, 1g of adhesion promoter, and 1g of drying promoter to the 2D material dispersion in sequence, maintaining a stirring speed of 300r / min during the addition process; continue stirring for 10 minutes after adding each additive to ensure that the additive is fully dissolved and evenly mixed with the dispersion to form a preliminary ink system;

[0085] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and subjected to two cycles of homogenization at a pressure of 100 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0086] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.5 μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0087] The two-dimensional material is graphene.

[0088] The dispersant is a compound of a surfactant and a polymer, and the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1; the surfactant is sodium dodecylbenzenesulfonate; and the polymer is polyvinylpyrrolidone.

[0089] The solvent is water.

[0090] The rheology regulator is sodium carboxymethyl cellulose.

[0091] The adhesion promoter is silane coupling agent KH-550.

[0092] The drying accelerator is propylene glycol.

[0093] Comparative Example 2

[0094] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0095] S1 2D material dispersion: 5g of 2D material and 2g of dispersant were added to 60g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 200W for 15 minutes to initially break up the 2D material agglomerates using the cavitation effect of ultrasound. The mixture was then transferred to a ball mill and ball milled at 300r / min for 2 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0096] S2 ink preparation: add 1g of rheology modifier, 1g of adhesion promoter, and 1g of drying promoter to the 2D material dispersion in sequence, maintaining a stirring speed of 300r / min during the addition process; continue stirring for 10 minutes after adding each additive to ensure that the additive is fully dissolved and evenly mixed with the dispersion to form a preliminary ink system;

[0097] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and subjected to two cycles of homogenization at a pressure of 100 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0098] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.5 μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0099] The two-dimensional material is modified graphene, and its preparation method is:

[0100] K1: Disperse 15 g of graphene with a particle size of 10 μm in 150 mL of 0.15 mol / L NaOH solution and perform ultrasonic dispersion for 40 minutes to ensure uniform dispersion of the graphene; then, add 0.3 g of 2-(2,3-epoxypropylthio)thiophene (CAS No. 57713-44-7) and stir at 70°C for 1 hour;

[0101] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain modified graphene.

[0102] The dispersant is a compound of a surfactant and a polymer, and the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1; the surfactant is sodium dodecylbenzenesulfonate; and the polymer is polyvinylpyrrolidone.

[0103] The solvent is water.

[0104] The rheology regulator is sodium carboxymethyl cellulose.

[0105] The adhesion promoter is silane coupling agent KH-550.

[0106] The drying accelerator is propylene glycol.

[0107] Comparative Example 3

[0108] A method for preparing a two-dimensional material nano-ink, the operating steps are:

[0109] S1 2D material dispersion: 5g of 2D material and 2g of dispersant were added to 60g of solvent and dispersed using an ultrasonic-ball milling synergistic dispersion method. The mixture was first ultrasonically treated at 200W for 15 minutes to initially break up the 2D material agglomerates using the cavitation effect of ultrasound. The mixture was then transferred to a ball mill and ball milled at 300r / min for 2 hours. The collision and friction of the grinding balls further refined the 2D material and enhanced the dispersion effect, resulting in a uniform 2D material dispersion.

[0110] S2 ink preparation: add 1g of rheology modifier, 1g of adhesion promoter, and 1g of drying promoter to the 2D material dispersion in sequence, maintaining a stirring speed of 300r / min during the addition process; continue stirring for 10 minutes after adding each additive to ensure that the additive is fully dissolved and evenly mixed with the dispersion to form a preliminary ink system;

[0111] S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and subjected to two cycles of homogenization at a pressure of 100 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink.

[0112] S4 Filtration and Purification: Use a nanofiltration membrane with a pore size of 0.5 μm to filter the homogenized ink to remove undispersed agglomerates, impurities and large particles to obtain high-quality two-dimensional material nano-ink.

[0113] The two-dimensional material is modified graphene, and its preparation method is:

[0114] K1: 15 g of graphene with a particle size of 10 μm was dispersed in 150 mL of a 0.15 mol / L NaOH solution and ultrasonically dispersed for 40 minutes to ensure uniform dispersion of the graphene; then, 2 g of allyl glycidyl ether was added and stirred at 70°C for 1 hour;

[0115] K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain modified graphene.

[0116] The dispersant is a compound of a surfactant and a polymer, and the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1; the surfactant is sodium dodecylbenzenesulfonate; and the polymer is polyvinylpyrrolidone.

[0117] The solvent is water.

[0118] The rheology regulator is sodium carboxymethyl cellulose.

[0119] The adhesion promoter is silane coupling agent KH-550.

[0120] The drying accelerator is propylene glycol.

[0121] Table 1: Test results of examples and comparative examples

[0122] Fineness / nm Adhesion / % Dispersion stability Example 1 68 93.7 No obvious agglomeration and precipitation Example 2 63 94.2 No obvious agglomeration and precipitation Example 3 57 94.8 No obvious agglomeration and precipitation Example 4 52 95.1 No obvious agglomeration and precipitation Comparative Example 1 187 76.3 There is obvious agglomeration and precipitation Comparative Example 2 102 86.9 There is obvious reunion Comparative Example 3 91 88.5 There is obvious reunion

[0123] Through the data analysis of the above examples and comparative examples, the nano-oil prepared by the present invention has no obvious agglomeration and precipitation phenomenon, and the ink has good dispersion stability; at the same time, the ink has high adhesion and the fineness reaches nanometer level.

[0124] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a two-dimensional material nano-ink, the operating steps of which are: S1 2D material dispersion: Add 5-15 parts of 2D material and 2-8 parts of dispersant to 60-80 parts of solvent, and use ultrasonic-ball milling synergistic dispersion method; first, ultrasonicate at 200-500W power for 15-60 minutes to initially break up 2D material agglomerates by ultrasonic cavitation; then transfer to a ball mill and ball mill at 300-800r / min for 2-6 hours. The collision and friction of the grinding balls further refine the 2D material and enhance the dispersion effect, resulting in a uniform 2D material dispersion; S2 ink preparation: Add 1-5 parts of rheology modifier, 1-3 parts of adhesion promoter, and 1-3 parts of drying accelerator to the two-dimensional material dispersion in sequence, maintaining a stirring speed of 300-800 r / min during the addition process; continue stirring for 10-30 minutes after adding each additive to ensure that the additive is fully dissolved and evenly mixed with the dispersion to form a preliminary ink system; S3 Deep Mixing and Homogenization: The preliminary ink system is transferred to a high-pressure homogenizer and homogenized 2-5 times at a pressure of 100-300 MPa. The high shear force of the high-pressure homogenizer further refines the particles in the ink, improving the uniformity and stability of the ink. S4 Filtration and Purification: The homogenized ink is filtered using a nanofiltration membrane with a pore size of 0.05-0.5 μm to remove undispersed aggregates, impurities, and large particles to obtain high-quality two-dimensional material nano-ink; The two-dimensional material is thiophene-modified graphene, which is prepared by reacting graphene, NaOH solution, allyl glycidyl ether and 2-(2,3-epoxypropylthio)thiophene.

2. The method for preparing a two-dimensional material nano-ink according to claim 1, wherein: The two-dimensional material is thiophene-modified graphene, and its preparation method is: K1: Disperse 15-30 parts of graphene with a particle size of 5-10 μm in 150-300 mL of a 0.15-0.5 mol / L NaOH solution, and perform ultrasonic dispersion for 40-100 minutes to ensure uniform dispersion of the graphene; then, add 2-5 parts of allyl glycidyl ether and 0.3-0.8 parts of 2-(2,3-epoxypropylthio)thiophene, and stir at a temperature of 70-80° C. for 1-4 hours; K2: After the reaction is completed, the modified product is separated by centrifugation, washed with deionized water, and dried to obtain thiophene-modified graphene.

3. The method for preparing a two-dimensional material nano-ink according to claim 1, characterized in that: The dispersant is a compound of a surfactant and a polymer, wherein the surfactant and the polymer are uniformly mixed in a mass ratio of 1:1-2; the surfactant is sodium dodecylbenzenesulfonate or sodium dodecyl sulfate; and the polymer is polyvinylpyrrolidone or sodium polystyrenesulfonate.

4. The method for preparing a two-dimensional material nano-ink according to claim 1, wherein: The solvent is one of water, ethanol, N-methylpyrrolidone and dimethyl sulfoxide.

5. The method for preparing a two-dimensional material nano-ink according to claim 1, characterized in that: The rheology regulator is sodium carboxymethyl cellulose or hydroxyethyl cellulose.

6. The method for preparing a two-dimensional material nano-ink according to claim 1, characterized in that: The adhesion promoter is silane coupling agent KH-550.

7. The method for preparing a two-dimensional material nano-ink according to claim 1, characterized in that: The drying accelerator is propylene glycol or ethylene glycol.