Directed arrangement method of carbon nanotubes based on coffee ring effect

Abstract

The present invention discloses a method for directional arrangement of carbon nanotubes based on the coffee ring effect, wherein a carbon nanotube dispersion is prepared and loaded into a printer barrel, a substrate is subjected to surface modification treatment, and a carbon nanotube coffee ring arranged at the edge of a droplet is printed by a print head according to a planned pattern path, and printing parameters are adjusted to print out a carbon nanotube coffee ring arranged at the edge of a droplet, so that adjacent "coffee rings" are connected to each other, fused and deposited to form a carbon nanotube line, thereby realizing directional arrangement of carbon nanotubes. The present invention positively utilizes the function of the "coffee ring" effect on directional arrangement of carbon nanotubes, realizes precise control and uniform arrangement of the shape density and spacing positioning of carbon nanotubes, and has the characteristics of simple operation, high arrangement efficiency, and good controllability.

Description

Technical Field

[0001] The invention belongs to the technical field of nano-processing and relates to a method for directional arrangement of carbon nanotubes based on the coffee ring effect. Background Art

[0002] At present, the mainstream carbon nanotube directional arrangement technologies include the following methods: dielectrophoresis, LB film method, contact printing method and water flow method. The dielectrophoresis method requires the application of a high electric field, which damages or aggregates the carbon nanotubes, thereby reducing the quality and uniformity of the directional arrangement; the LB film method can only achieve two-dimensional arrangement, which is limited for the preparation of three-dimensional carbon nanotube arrangement; the contact printing method may be limited by the surface roughness and morphology of the substrate in practical applications, which may lead to uneven arrangement of carbon nanotubes; the water flow method has certain requirements for the length and diameter of carbon nanotubes, and is not suitable for shorter or thinner carbon nanotubes; the above methods may include applicability limitations, challenges in arrangement quality and uniformity. In general, the existing arrangement technology has the disadvantages of complex arrangement methods, low arrangement efficiency, and uneven distribution, which poses many obstacles to the research of carbon nanotubes in microelectronic devices. Therefore, it is particularly urgent to establish a simple, fast and accurate carbon nanotube arrangement method.

[0003] Micro-nano 3D printing technology uses micro-nano level precision and resolution to manufacture three-dimensional structures. Its specific classification includes inkjet printing, droplet jetting, electrospray printing technology, etc. Among them, inkjet printing is a means of patterning and depositing functional materials, which has the advantages of high resolution, fast printing speed, convenient operation and low cost; droplet jetting is a technology that divides ink into tiny droplets and then accurately sprays them onto the printing medium with an electric field or pressure, which has the advantages of fast printing speed and high ink utilization; electrospray printing is a technology that charges ink and attracts it to the printing medium with an electrostatic field, which has the advantages of high resolution, high precision, and multiple patterns. In summary, micro-nano 3D printing technology is a very advanced and innovative printing technology. By adjusting the printing parameters, the flight trajectory and landing position of the printing material can be controlled, thereby realizing the printing of any shape and surface. Therefore, it has received widespread attention in the field of functional device research and application.

[0004] Since the evaporation rate at the edge of the droplet is greater than the evaporation rate at the center, an outward capillary flow is generated inside the droplet, carrying the suspended particles to the edge of the droplet and depositing them in a ring shape at the edge, producing a "coffee ring" effect. The deposition process is as follows: when the droplet dries on the solid surface, it will maintain a gas-liquid-solid three-phase contact line. Under the action of droplet evaporation and external environmental forces, there is an outward capillary force inside the droplet, moving the suspended particles from the center of the droplet to the edge; after evaporation, the suspended particles are highly concentrated along the gas-liquid-solid three-phase contact line, resulting in an uneven deposition "coffee ring" effect. During the printing process, the "coffee ring" effect will inevitably occur, that is, the printed droplet spontaneously forms a ring-shaped structure after contacting the substrate. This effect will lead to uneven deposition of functional materials, thereby affecting the resolution of the printed pattern and the performance of the prepared functional device. However, if the "coffee ring" effect can be used to achieve directional arrangement of carbon nanotubes, it will be of great research value and significance, and will greatly improve the accuracy of micro-nano printing patterns and the performance of functional devices. Summary of the invention

[0005] The purpose of the present invention is to provide a method for directional arrangement of carbon nanotubes based on the coffee ring effect, which solves the problems of complexity, low efficiency and uneven distribution of the directional arrangement of carbon nanotubes in the prior art.

[0006] The technical solution adopted by the present invention is a method for directional arrangement of carbon nanotubes based on the coffee ring effect, which comprises preparing a carbon nanotube dispersion and loading it into a printer barrel, performing surface modification on a substrate, and printing on the substrate according to a planned pattern path through a print head. The printing parameters are adjusted to print out carbon nanotube coffee rings arranged at the edge of the droplet, so that adjacent "coffee rings" are interconnected, fused and deposited to form a carbon nanotube line, thereby realizing the directional arrangement of carbon nanotubes.

[0007] The present invention is also characterized in that:

[0008] Follow the steps below to implement it:

[0009] Step 1, preparing a carbon nanotube dispersion, and loading the carbon nanotube dispersion into a printer barrel of a micro-nano 3D printer device;

[0010] Step 2, preparing a surface modification solution, treating the substrate with the surface modification solution, and fixing the substrate on a printing table;

[0011] Step 3, the printer starts printing to print the carbon nanotube dispersion on the substrate;

[0012] Step 4: After the printing work is completed, remove the substrate and observe the accuracy of the printed pattern.

[0013] The specific process of step 1 is as follows: add deionized water and dispersant into a beaker and stir, then add carbon nanotube solid powder and continue to stir and disperse, ultrasonicate for 30 minutes, let stand and cool for 5 minutes to allow the solution to reach a stable state, pour the configured carbon nanotube dispersion functional material into the printer barrel to complete the pre-printing work.

[0014] The specific process of step 2 is: weigh deionized water and surfactant in a beaker, stir to mix thoroughly, select a substrate and put it into the beaker to soak for 10 minutes, take it out, let it stand for 5 minutes, complete the surface modification of the substrate, fix the treated substrate on the printing table with a clamp, and complete the pre-printing work.

[0015] The specific process of step 3 is: turn on the printer, set the printing parameters, and the printer starts printing; by adjusting the printing parameters, the printing material is accurately printed on the surface of the specified substrate, and a variety of patterns are arranged by compiling G code to achieve the production of various complex structures.

[0016] The specific process of step 4 is: use a microscope to observe the carbon nanotube coffee ring array on the substrate, evaluate the carbon nanotube arrangement effect by measuring the printing line width and printing spacing, and optimize and improve according to the evaluation results to achieve high-efficiency and high-precision directional arrangement of carbon nanotubes.

[0017] In step 1, the carbon nanotube dispersion is formed by dissolving carbon nanotubes in one or more halogenated hydrocarbons, and the dispersant is any organic solvent selected from chloroform, dichloroethane, trichloroethane, chlorobenzene, dichlorobenzene, and bromobenzene.

[0018] In step 1, the micro-nano 3D printer equipment is selected from any one of an electrohydrodynamic jet printer, a droplet jet printer, and an inkjet printer.

[0019] In step 2, the surface modification solution is an aqueous solution to which a surfactant has been added, and the surfactant is any combination of sodium deoxycholate, sodium cholate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, polysorbate, and polyethylene glycol;

[0020] The substrate can be selected from any one of Si substrate, SiO2 substrate, glass substrate, paper substrate, polyethylene terephthalate substrate and polydimethylsiloxane substrate.

[0021] The beneficial effects of the present invention are as follows: the carbon nanotube directional arrangement method based on the coffee ring effect of the present invention can achieve an arrangement with adjustable shape density and precise spacing of carbon nanotubes, and has the characteristics of simple operation, high arrangement efficiency and good controllability. It can effectively solve the problems of complex, low efficiency and uneven distribution of the carbon nanotube directional arrangement method in the prior art, and has important scientific significance and engineering application value for improving the accuracy of micro-nano printing patterns. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the printing process of the method for oriented arrangement of carbon nanotubes based on the coffee ring effect in Example 1 of the present invention;

[0023] Figure 2 This is a microscope photograph of a carbon nanotube array prepared by the carbon nanotube directional arrangement method based on the coffee ring effect in Example 1 of the present invention.

[0024] In the figure, 1. printer barrel, 2. print nozzle, 3. substrate, 4. carbon nanotube coffee ring, 5. carbon nanotube wire. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The present invention discloses a method for directional arrangement of carbon nanotubes based on the coffee ring effect. First, the prepared carbon nanotube dispersion is loaded into a printer barrel 1, and then a print head 2 is used to print a pattern path planned according to the G code on a substrate 3. Then, the printing parameters are adjusted to print out a carbon nanotube coffee ring 4 arranged at the edge of the droplet, so that adjacent "coffee rings" are connected to each other, fused and deposited to form a carbon nanotube line 5, thereby realizing the directional arrangement of the carbon nanotubes.

[0027] The method for directional arrangement of carbon nanotubes based on the coffee ring effect of the present invention is specifically implemented according to the following steps:

[0028] Step 1, preparing a carbon nanotube dispersion, and loading the prepared carbon nanotube dispersion into a printer barrel 1 of a micro-nano 3D printer device;

[0029] The specific process of step 1 is as follows: add deionized water and dispersant to a beaker and stir, then add carbon nanotube solid powder and continue stirring and dispersing, ultrasonically treat for 30 minutes, let stand and cool for 5 minutes to allow the solution to reach a stable state, pour the configured carbon nanotube dispersion functional material into the printer barrel 1, and complete the pre-printing work; the carbon nanotube dispersion is formed by dissolving carbon nanotubes in one or more halogenated hydrocarbons, and the dispersant is any organic solvent selected from chloroform, dichloroethane, trichloroethane, chlorobenzene, dichlorobenzene, and bromobenzene. The micro-nano 3D printer equipment uses any one of an electrohydrodynamic jet printer, a droplet jet printer, and an inkjet printer.

[0030] Step 2, preparing a surface modification solution, treating the substrate 3 with the surface modification solution, and fixing the substrate on a printing table;

[0031] The specific process of step 2 is as follows: weigh deionized water and surfactant in a beaker, stir and mix thoroughly, select substrate 3 and put it into the beaker to soak for 10 minutes, take it out, let it stand for 5 minutes, complete the surface modification of the substrate, fix the treated substrate 3 on the printing table by a clamp, and complete the pre-printing work; treat the substrate 3 with a surface modification solution to make the substrate 3 hydrophilic, promote the edge deposition of the carbon nanotube dispersion on the substrate, and enhance the positive effect of the "coffee ring" effect.

[0032] Among them, the surface modification solution is an aqueous solution to which a surfactant is added, and the surfactant is any combination of sodium deoxycholate, sodium cholate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, polysorbate, and polyethylene glycol; the substrate 3 is selected from any one of a Si substrate, a SiO2 substrate, a glass substrate, a paper substrate, a polyethylene terephthalate substrate, and a polydimethylsiloxane substrate.

[0033] Step 3, the printer starts printing to print the carbon nanotube dispersion on the substrate;

[0034] The specific process of step 3 is: turn on the printer, set the printing parameters, and the printer starts printing; by adjusting the printing parameters, the printing material is accurately sprayed on the surface of the substrate, and a variety of patterns are arranged by compiling G code to realize the production of various complex structures.

[0035] The printing parameters are set as follows: the nozzle size of the print head 2 is 70 μm-90 μm, the air pressure is 0.1 MPa-0.3 MPa, the heating temperature of the substrate 3 is 80° C., and the height of the print head 2 from the substrate 3 is 2-20 mm.

[0036] Step 4: After the printing work is completed, remove the substrate 3 and observe the accuracy of the printed pattern.

[0037] The specific process of step 4 is: using a microscope to observe the carbon nanotube coffee ring array on the substrate 3, evaluating the carbon nanotube arrangement effect by measuring the print line width and print spacing, and optimizing and improving according to the evaluation results to achieve high-efficiency and high-precision directional arrangement of carbon nanotubes.

[0038] The working principle of the carbon nanotube directional arrangement method based on the coffee ring effect of the present invention is opposite to the common method of suppressing the coffee ring effect. The present invention effectively utilizes the "coffee ring" effect to accelerate the edge deposition phenomenon of the carbon nanotube dispersion liquid, and realizes the function of directional arrangement of carbon nanotubes. The surface of the substrate is modified by a surface modification solution to make the surface hydrophilic, enhance the adhesion between the substrate and the droplet, so that the carbon nanotube particles are highly concentrated at the edge of the droplet, and form a reinforced "coffee ring" effect on the substrate, that is, the solute in the middle part is sparse, while the solute in the edge part is dense; using micro-nano 3D printing technology, during the printing process, the particles in the droplet are subjected to the force of moving toward the edge of the liquid, and by adjusting the printing parameters, the carbon nanotube coffee ring arranged at the edge of the droplet is printed, so that adjacent "coffee rings" are connected to each other, and fused and deposited to form a carbon nanotube line, thereby realizing the directional arrangement of carbon nanotubes.

[0039] Example 1

[0040] The method for directional arrangement of carbon nanotubes based on the coffee ring effect of the present invention is specifically implemented according to the following steps:

[0041] Step 1, prepare a carbon nanotube dispersion and load it into an electrohydrodynamic jet printer barrel 1;

[0042] Prepare a carbon nanotube dispersion with a mass fraction of 1%, add 49.1g of deionized water and 0.4g of ethylene dichloride as a dispersant in a 100ml beaker and stir, then add 0.5g of carbon nanotube solid powder and stir and disperse, put the beaker into an ultrasonic processor for 30min ultrasonic treatment and then stand for 5min to ensure that the solution is fully mixed to obtain a carbon nanotube dispersion. Pour the prepared carbon nanotube dispersion into the barrel of an electrohydrodynamic jet printer to complete the pre-printing work.

[0043] Step 2, after the substrate is treated with a surface modification solution, it is fixed on a printing table;

[0044] Prepare the surface modification solution, weigh 40 ml of polyethylene glycol and 40 ml of sodium cholate in a 100 ml beaker and stir to mix thoroughly, put the SiO2 substrate into the beaker and soak for 10 minutes, then take it out and let it stand for 5 minutes to complete the surface modification of the substrate. Fix the treated substrate on the printing table with a clamp to complete the pre-printing work.

[0045] Step 3: The printer starts printing to print the carbon nanotube dispersion on the substrate.

[0046] Turn on the printer, set the printing parameters, nozzle size 90μm, voltage 1.5kv, air pressure 0.1MPa, printing platform moving speed 1.5mm / s, substrate heating temperature 80℃, print head height 2mm from substrate, and start printing. An electric field is formed between the print head and the printing substrate. At the same time, the air pump provides air pressure to send the printing material to the nozzle of the electrohydrodynamic jet device, and then flow to the nozzle to form a Taylor cone, and then spray deposition and finally form.

[0047] Step 4: After the printing work is completed, remove the SiO2 substrate and observe the accuracy of the printed pattern.

[0048] After the printing work is completed, the SiO2 substrate is removed and the carbon nanotube coffee ring array on the substrate is observed under a microscope. The carbon nanotube arrangement effect is evaluated by measuring the printing line width and printing spacing. Optimization and improvement are carried out based on the evaluation results to achieve high-efficiency and high-precision directional arrangement of carbon nanotubes.

[0049] Example 1 A carbon nanotube coffee ring array obtained by a method for oriented arrangement of carbon nanotubes based on the coffee ring effect, such as Figure 1 As shown, the printer continuously prints the carbon nanotube dispersion on the substrate, so that the edges of the coffee rings of the previous drop of solution and the next drop of solution overlap and merge, and the printed points merge and deposit to form a carbon nanotube line, thereby realizing the directional arrangement of the carbon nanotubes.

[0050] Microscope photo of carbon nanotube oriented arrangement obtained by the carbon nanotube oriented arrangement method based on the coffee ring effect. Figure 2 As shown, when observing the carbon nanotube coffee ring array under a 2x microscope, 5 carbon nanotube lines can be seen. The carbon nanotubes are evenly distributed on both sides of the carbon nanotube lines, and the width of a single line is 600um, and the line spacing is 250um. By adjusting the printing parameters of micro-nano 3D printing, the shape density and spacing positioning of the carbon nanotubes can be precisely controlled and evenly arranged.

[0051] Example 2

[0052] The method for directional arrangement of carbon nanotubes based on the coffee ring effect of the present invention is specifically implemented according to the following steps:

[0053] Step 1, prepare carbon nanotube dispersion functional material and load it into the droplet jet printer barrel 1;

[0054] Prepare a carbon nanotube dispersion with a mass fraction of 1%, add 49.1.g of deionized water and 0.4g of dichlorobenzene as a dispersant in a 100ml beaker and stir, then add 0.5g of carbon nanotube solid powder and stir and disperse, put the beaker into an ultrasonic processor for 30min ultrasonic treatment and then stand for 5min to ensure that the solution is fully mixed to obtain a carbon nanotube dispersion. Pour the prepared carbon nanotube dispersion into the barrel of a droplet jet printer to complete the pre-printing work.

[0055] Step 2, after the substrate is treated with a surface modification solution, it is fixed on a printing table;

[0056] Prepare the surface modification solution, weigh 40 ml of polyethylene glycol and 40 ml of sodium deoxycholate in a 100 ml beaker and stir to mix thoroughly, put the Si substrate into the beaker and soak for 10 minutes, then take it out and let it stand for 5 minutes to complete the surface modification of the substrate. Fix the treated substrate on the printing table with a clamp to complete the pre-printing work.

[0057] Step 3: The printer starts printing to print the carbon nanotube dispersion on the substrate.

[0058] Turn on the printer, set the printing parameters, select the nozzle of 90μm, drive the power module pulse parameters of amplitude 240V, width / 10μs, frequency 1Hz, print platform moving speed 1.5mm / s, print head height 2cm from the substrate to start printing. The micro-droplet nozzle sprays out a uniform and stable single micro-droplet, and cooperates with the movement of the printing platform to print on demand and finally form.

[0059] Step 4: After the printing work is completed, remove the Si substrate and observe the printing pattern accuracy.

[0060] After the printing work is completed, the Si substrate is removed and the carbon nanotube coffee ring array on the substrate is observed under a microscope. The carbon nanotube arrangement effect is evaluated by measuring the printing line width and printing spacing. Optimization and improvement are carried out based on the evaluation results to achieve high-efficiency and high-precision directional arrangement of carbon nanotubes.

[0061] Example 3

[0062] The method for directional arrangement of carbon nanotubes based on the coffee ring effect of the present invention is specifically implemented according to the following steps:

[0063] Step 1, preparing a carbon nanotube dispersion functional material and loading it into an inkjet printer barrel 1;

[0064] Prepare a carbon nanotube dispersion with a mass fraction of 1%, add 49.1g of deionized water and 0.4g of bromobenzene as a dispersant into a 100ml beaker and stir, then add 0.5g of carbon nanotube solid powder and stir and disperse, put the beaker into an ultrasonic processor for 30min ultrasonic treatment and then stand for 5min to ensure that the solution is fully mixed to obtain a carbon nanotube dispersion. Pour the prepared carbon nanotube dispersion into the inkjet printer barrel to complete the pre-printing work.

[0065] Step 2, after the substrate is treated with a surface modification solution, it is fixed on a printing table;

[0066] Prepare a surface modification solution, weigh 40 ml of polyethylene glycol and 40 ml of sodium dodecyl sulfate in a 100 ml beaker and stir to mix thoroughly, put the glass substrate into the beaker and soak for 10 minutes, then take it out and let it stand for 5 minutes to complete the surface modification of the substrate. Fix the treated substrate on the printing table with a clamp to complete the pre-printing work.

[0067] Step 3: The printer starts printing to print the carbon nanotube dispersion on the substrate.

[0068] Turn on the printer, set the printing parameters, the scanning speed is 2mm / s, the extrusion pressure is 0.3MPa, the nozzle is selected as a 70μm nozzle, the nozzle temperature is 60℃, the substrate temperature during printing is 80℃, and start printing. Use a non-contact dot-jet printing system to print on a surface-modified glass substrate. The lower part of the substrate is heated while printing, and dot-jet printing is performed on demand and finally formed.

[0069] Step 4: After the printing work is completed, remove the glass substrate and observe the accuracy of the printed pattern.

[0070] After the printing work is completed, the glass substrate is removed and the carbon nanotube coffee ring array on the substrate is observed under a microscope. The carbon nanotube arrangement effect is evaluated by measuring the printing line width and printing spacing. Optimization and improvement are carried out based on the evaluation results to achieve high-efficiency and high-precision directional arrangement of carbon nanotubes.

[0071] The present invention is a method for directional arrangement of carbon nanotubes based on the coffee ring effect. The carbon nanotube dispersion is printed on a pre-treated substrate using micro-nano 3D printing technology. During the printing process, the carbon nanotubes are deposited on the edge of the droplets using the "coffee ring" effect. By adjusting the printing parameters, the size and spacing of the droplets are controlled, so that the edges of adjacent droplets overlap to form a continuous "coffee ring". During the diffusion and deposition process, each droplet will produce a "coffee ring" phenomenon with a thin center and dense surroundings. By continuously printing the carbon nanotube dispersion, a regular "coffee ring" array pattern is formed, thereby realizing the directional arrangement of carbon nanotubes.

[0072] During printing, the capillary force in the carbon nanotube dispersion is enhanced to move outward due to the effect of the electric field force and the thermal field of the substrate, and the substrate treated by surface modification changes its wettability, thereby enhancing the outward diffusion activity of the carbon nanotube particles and promoting the adhesion between the solution particles and the base material. These factors cause the ejected carbon nanotube particles to flow toward the edge of the liquid, forming an uneven deposition phenomenon with scarce solutes in the middle and dense solutes at the edge, i.e., the "coffee ring" effect. Since all the solutes diffuse to both sides of the printed pattern line for deposition, the phenomenon of deposition of the contact line of two drops of solution is reduced, and finally the arrangement phenomenon of most of the carbon nanotubes deposited on both sides of the printed line is presented, realizing the function of directional arrangement of carbon nanotubes by positively utilizing the "coffee ring" effect, having the advantages of simple operation, high arrangement efficiency, good controllability, etc., and realizing high-precision directional arrangement of carbon nanotubes.

Claims

1. A method for directional arrangement of carbon nanotubes based on the coffee ring effect, characterized in that: Follow the steps below to implement it: Step 1, preparing a carbon nanotube dispersion, and loading the carbon nanotube dispersion into a printer barrel (1) of a micro-nano 3D printer device; Step 2, preparing a surface modification solution, treating the substrate (3) with the surface modification solution, and fixing the substrate on a printing table; Step 3, the printer starts printing to print the carbon nanotube dispersion on the substrate (3); Step 4, after the printing work is completed, remove the substrate (3) and observe the accuracy of the printed pattern; A carbon nanotube dispersion is prepared and loaded into a printer barrel (1), a substrate (3) is subjected to surface modification treatment, and a printing nozzle (2) is used to print on the substrate (3) according to a planned pattern path, and printing parameters are adjusted to print carbon nanotube coffee rings (4) arranged at the edge of the droplet, so that adjacent "coffee rings" are connected to each other, fused and deposited to form a carbon nanotube line (5), thereby achieving directional arrangement of the carbon nanotubes; The specific process of step 1 is as follows: adding deionized water and dispersant into a beaker and stirring, then adding carbon nanotube solid powder and continuing to stir and disperse, ultrasonic treatment for 30 minutes, standing and cooling for 5 minutes to allow the solution to reach a stable state, and pouring the prepared carbon nanotube dispersion functional material into the printer barrel (1) to complete the pre-printing work; The specific process of step 2 is as follows: weighing deionized water and a surfactant in a beaker, stirring and mixing them thoroughly, selecting a substrate (3) and placing it in the beaker to soak for 10 minutes, taking it out, and letting it stand for 5 minutes to complete the surface modification of the substrate, and fixing the treated substrate (3) on the printing table by a clamp to complete the pre-printing work; The specific process of step 3 is: turn on the printer, set the printing parameters, and the printer starts printing; by adjusting the printing parameters, the printing material is accurately printed on the surface of the specified substrate, and by compiling the G code to arrange various patterns, a variety of complex structures can be produced.

2. The method for oriented arrangement of carbon nanotubes based on the coffee ring effect according to claim 1, characterized in that: The specific process of step 4 is: using a microscope to observe the carbon nanotube coffee ring array on the substrate (3), evaluating the carbon nanotube arrangement effect by measuring the print line width and print spacing, and optimizing and improving according to the evaluation results to achieve high-efficiency and high-precision directional arrangement of the carbon nanotubes.

3. The method for oriented arrangement of carbon nanotubes based on the coffee ring effect according to claim 2, characterized in that: In step 1, the carbon nanotube dispersion is formed by dissolving carbon nanotubes in one or more halogenated hydrocarbons, and the dispersant is any organic solvent selected from chloroform, dichloroethane, trichloroethane, chlorobenzene, dichlorobenzene, and bromobenzene.

4. The method for oriented arrangement of carbon nanotubes based on the coffee ring effect according to claim 1, characterized in that: In the step 1, the micro-nano 3D printer device is selected from any one of an electrohydrodynamic jet printer, a droplet jet printer, and an inkjet printer.

5. The method for oriented arrangement of carbon nanotubes based on the coffee ring effect according to claim 1, characterized in that: The surface modification solution in step 2 is an aqueous solution to which a surfactant has been added, and the surfactant is any combination of sodium deoxycholate, sodium cholate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, polysorbate, and polyethylene glycol.

6. The method for oriented arrangement of carbon nanotubes based on the coffee ring effect according to claim 1, characterized in that: The substrate (3) is selected from any one of a Si substrate, a SiO2 substrate, a glass substrate, a paper substrate, a polyethylene terephthalate substrate, and a polydimethylsiloxane substrate.

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