CN113651314A - Preparation method of highly oriented carbon nanotube transparent film - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 136
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 136
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000006228 supernatant Substances 0.000 claims abstract description 88
- 238000001914 filtration Methods 0.000 claims abstract description 57
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 239000012528 membrane Substances 0.000 claims abstract description 30
- 239000007864 aqueous solution Substances 0.000 claims abstract description 23
- 239000012065 filter cake Substances 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 8
- 238000003828 vacuum filtration Methods 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 35
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 26
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 18
- 229920002678 cellulose Polymers 0.000 claims description 11
- 238000004821 distillation Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 239000002238 carbon nanotube film Substances 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract 1
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000012153 distilled water Substances 0.000 description 9
- 239000011259 mixed solution Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000005303 weighing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229960003964 deoxycholic acid Drugs 0.000 description 1
- KXGVEGMKQFWNSR-LLQZFEROSA-N deoxycholic acid Chemical compound C([C@H]1CC2)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)[C@@H](O)C1 KXGVEGMKQFWNSR-LLQZFEROSA-N 0.000 description 1
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- 238000000967 suction filtration Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
Abstract
The invention discloses a preparation method of a transparent film of highly oriented carbon nanotubes, which comprises the following steps: s1, performing ultrasonic dispersion on a carbon nano tube aqueous solution, performing centrifugal separation to obtain a supernatant, and dividing the supernatant into a first supernatant and a second supernatant; s2, filtering the first supernatant fluid by using a filter membrane at normal temperature and normal pressure to obtain a filter cake, and performing vacuum filtration on the filter cake to obtain a carbon nano tube composite film, wherein the carbon nano tube composite film is a composite film of the carbon nano tube film and the filter membrane which are tightly combined; and S3, adding the carbon nanotube composite film into a solvent, dissolving the filter membrane in the step S2, and taking out solid insoluble substances to obtain the highly oriented carbon nanotube transparent film, wherein the obtained carbon nanotube film is oriented and has good conductivity.
Description
Technical Field
The invention relates to the field of conductive film preparation, in particular to a preparation method of a highly oriented carbon nanotube transparent film.
Technical Field
Carbon nanotubes are a novel one-dimensional nanomaterial discovered in the early nineties. The special structure of the carbon nanotube determines the special properties of the carbon nanotube, such as high tensile strength and high thermal stability; the carbon nanotubes may exhibit metallic or semiconducting properties, etc., according to the change in the helical form of the carbon nanotubes. Because the carbon nanotube has an ideal one-dimensional structure and excellent properties in the fields of mechanics, electricity, thermal engineering and the like, the carbon nanotube has a wide application prospect in the fields of interdisciplines such as material science, chemistry, physics and the like, and is also paid more and more attention to scientific research and industrial application.
Although the carbon nanotubes have excellent properties and are widely used, the carbon nanotubes prepared by the method are generally granular or powdery, which causes inconvenience to people. Carbon nanotubes are highly anisotropic nanoparticles with very large aspect ratios. The electrical conductivity and thermal conductivity along the tube axis direction of the carbon nanotubes are excellent, and if the directional arrangement can be realized, the directional arrangement of the carbon nanotubes can be realized to a greater extent and by utilizing the excellent properties of the carbon nanotubes, the difficulty is high and the complexity is high.
At present, the directional arrangement of carbon nanotubes needs to be realized by means of catalytic chemical vapor deposition, strong magnetic field, electric field or chemical vapor deposition and the like, the requirement on equipment is high, the limited equipment condition is limited, the large-scale preparation of the directionally arranged carbon nanotube film is difficult, the cost is high, relevant research is carried out for the large-scale preparation of the directionally arranged carbon nanotube transparent film in the prior art, for example, sodium deoxycholate is used as a dispersing agent by Elena Bekyarova and the like in the United states, the dispersed carbon nanotubes are prepared into a solution, and then the solution is subjected to suction filtration to obtain the directionally arranged carbon nanotube film, but the dispersing agent cannot be removed, so that the electric conductivity of the carbon nanotube film is influenced between the carbon nanotubes.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of a carbon nano tube transparent film with highly oriented arrangement, and the obtained carbon nano tube transparent film has oriented arrangement and good conductivity.
The technical scheme of the invention is to provide a preparation method of a transparent film of highly oriented carbon nanotubes, which comprises the following steps:
s1, performing ultrasonic dispersion on the carbon nanotube aqueous solution, performing centrifugal separation to obtain a supernatant, and dividing the supernatant into a first supernatant and a second supernatant;
s2, filtering the first supernatant with a filter membrane at normal temperature and normal pressure to obtain a filter cake, and carrying out vacuum filtration on the filter cake to obtain a carbon nanotube composite film, wherein the carbon nanotube composite film is a composite film of a carbon nanotube film and the filter membrane which are tightly combined;
s3, adding the carbon nano tube composite film into a solvent, dissolving the filter membrane in the step S2, and taking out solid insoluble substances to obtain the highly oriented carbon nano tube transparent film.
Further, the method also comprises the following steps: s4, repeating the step S3 for 1-3 times.
Preferably, the filter membrane is a mixed cellulose ester filter membrane.
Preferably, the solvent comprises one or more of acetone and ethyl acetate.
Preferably, the concentration of the carbon nanotube aqueous solution is 0.4% -1.0% (wt/vol).
Preferably, the rotation speed of the centrifugal separation is 10000-.
Preferably, the pore size of the filter is no greater than 0.45 μm.
Preferably, the filtration time is less than 2 drops/minute.
Preferably, the dissolving method in the step S3 includes one or more of solvent standing dissolving and solvent steam distillation dissolving, and the solvent standing dissolving includes the steps of: mixing the filter membrane with a solvent, standing for 10-30min, removing the solvent, and repeating for 1-3 times; the solvent vapor distillation dissolution comprises the following steps: and placing the carbon nano tube composite film above the solvent, heating the solvent until the solvent is evaporated, and fumigating the carbon nano tube composite film.
Preferably, the first supernatant is 30-60% by volume of the supernatant, more preferably, the first supernatant is 50% by volume of the supernatant.
The method takes a functional carbon nanotube aqueous solution as a raw material, utilizes a soluble filter membrane to filter at a low speed, realizes highly directional arrangement of the carbon nanotubes under the action of intermolecular van der Waals force and an earth magnetic field, and then uses a vacuum pumping and filtering pump to pump and filter so as to ensure that the directionally arranged carbon nanotubes are more compact and form a carbon nanotube film.
The invention has the beneficial effects that:
1. according to the scheme, no dispersing agent is used, and the prepared carbon nanotube transparent film has excellent conductivity;
2. the method realizes the highly uniform directional arrangement of the carbon nano tubes at normal temperature and normal pressure, and is suitable for preparing the carbon nano tube transparent film on a large scale;
3. the carbon nano tube transparent film is extracted by adopting a dissolving filter membrane mode, and the separation mode is mild, so that the physical structure of the carbon nano tube transparent film is benefited;
4. according to the scheme, the carbon nano tubes which are arranged in an oriented mode are more compact by filtering at normal temperature and normal pressure and then performing vacuum filtration, so that the mechanical property and the electrical property of the carbon nano tube transparent film are improved;
5. the scheme is low in cost, is easier to realize large-scale preparation compared with the existing method, and is more suitable for preparing products such as carbon-based chips, diodes, solar energy or battery electrodes and the like.
Drawings
FIG. 1 is an electron microscope image of a transparent film of highly aligned carbon nanotubes of example 1;
FIG. 2 is a diagram showing the results of measuring the resistance of the highly aligned carbon nanotube transparent film prepared in example 1, with respect to the direction perpendicular to the diameter of the carbon nanotubes;
FIG. 3 is the resistance test result of the highly aligned carbon nanotube transparent film prepared in example 1 along the tube diameter direction of the carbon nanotubes;
FIG. 4 shows the results of resistivity contrast tests at a temperature of 300 k.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments are not indicated by manufacturers, and are conventional products available by purchase
Example 1
A method for preparing a transparent film of highly oriented carbon nanotubes comprises the following steps:
s1, weighing 0.4g of carbon nanotube, adding the carbon nanotube into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 0.4% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifugal tube, centrifuging for 60min at 10000 r/min, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 30% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.45 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtering during filtering, the dropping speed is controlled to be 2 drops/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtering by using a vacuum pumping and filtering pump to obtain the carbon nano tube composite membrane;
s3, placing the carbon nano tube composite film in an acetone solution, standing for 10 minutes, fishing out the solid insoluble film floating in the acetone solution by using a fine iron wire to obtain the highly oriented carbon nano tube transparent film, wherein an electron microscope picture is shown as figure 1, the resistivity of the obtained highly oriented carbon nano tube transparent film is measured by using a four-probe method, and the results are shown as figures 2 and 3.
Example 2
A method for preparing a transparent film of highly oriented carbon nanotubes comprises the following steps:
s1, weighing 0.8g of carbon nanotube, adding the carbon nanotube into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 0.8% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifugal tube, centrifuging for 60min at 10000 r/min, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 50% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.3 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtering during filtering, the dropping speed is controlled to be 1 drop/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtering by using a vacuum pumping and filtering pump to obtain the carbon nano tube composite membrane;
s3, placing the carbon nano tube composite film above the ethyl acetate solution, heating the ethyl acetate solution to 100 ℃ to evaporate the solvent, and obtaining the highly oriented carbon nano tube transparent film after the temperature is restored to normal temperature.
Example 3
A method for preparing a transparent film of highly oriented carbon nanotubes comprises the following steps:
s1, weighing 0.5g of carbon nanotubes, adding the carbon nanotubes into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 0.5% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifugal tube, centrifuging at 11000 r/min for 70min, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 50% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.3 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtering during filtering, the dropping speed is controlled to be 1 drop/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtering by using a vacuum pumping and filtering pump to obtain the carbon nano tube composite membrane;
s3, placing the carbon nano tube composite film in an acetone solution, standing for 10 minutes, and fishing out the solid insoluble film floating in the acetone solution by using a fine iron wire;
s4, repeating the step S3 for 1 time to obtain the transparent film of the highly oriented carbon nano tubes.
Example 4
A method for preparing a transparent film of highly oriented carbon nanotubes comprises the following steps:
s1, weighing 1g of carbon nanotubes, adding the carbon nanotubes into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 1% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifuge tube, centrifuging for 65min at 10500 rpm, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 60% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.1 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtering during filtering, the dropping speed is controlled to be 0.5 drop/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtering by using a vacuum filtering pump to obtain the carbon nano tube composite film;
s3, placing the carbon nano tube composite film above the acetone solution, heating the acetone solution to 100 ℃ to evaporate the solvent, and waiting for the temperature to return to normal;
s4, repeating the step S3 for 2 times to obtain the transparent film of the highly oriented carbon nano tubes.
Example 5
A method for preparing a transparent film of highly oriented carbon nanotubes comprises the following steps:
s1, weighing 0.8g of carbon nanotube, adding the carbon nanotube into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 0.8% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifugal tube, centrifuging for 60min at 10000 r/min, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 50% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.3 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtering during filtering, the dropping speed is controlled to be 1 drop/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtering by using a vacuum pumping and filtering pump to obtain the carbon nano tube composite membrane;
s3, placing the carbon nano tube composite film above the ethyl acetate solution, heating the ethyl acetate solution to 100 ℃ to evaporate the solvent, and recovering to normal temperature;
and S4, repeating the step S3 for 3 times to obtain the transparent film of the highly oriented carbon nano tubes.
Comparative example 1
A preparation method of a carbon nano tube transparent film comprises the following steps:
s1, weighing 1g of carbon nanotubes, adding the carbon nanotubes into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 1% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifuge tube, centrifuging for 65min at 10500 rpm, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 60% of the volume of the supernatant liquid;
s2, performing vacuum filtration on the first supernatant by using a mixed cellulose ester filter membrane with the aperture of 0.1 mu m to obtain a filter cake, namely the carbon nano tube composite film;
s3, placing the carbon nano tube composite film in an acetone solution, standing for 10 minutes, and fishing out the solid insoluble film floating in the acetone solution by using a fine iron wire;
s4, repeating the step S3 for 2 times to obtain the carbon nano tube transparent film.
Comparative example 2
A preparation method of a carbon nano tube transparent film comprises the following steps:
s1, weighing 10g of carbon nanotubes, adding the carbon nanotubes into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 10% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifugal tube, centrifuging at 10500 r/min for 65min, and taking the supernatant to obtain supernatant;
s2, filtering the supernatant by using a mixed cellulose ester filter membrane with the aperture of 0.1 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtration during filtering, the dropping speed is controlled to be 0.5 drop/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtration by using a vacuum filtration pump to obtain the carbon nano tube composite film;
s3, placing the carbon nano tube composite film in an acetone solution, standing for 10 minutes, and fishing out the solid insoluble film floating in the acetone solution by using a fine iron wire;
s4, repeating the step S3 for 2 times to obtain the carbon nano tube transparent film.
Comparative example 3
A preparation method of a carbon nano tube transparent film comprises the following steps:
s1, weighing 1g of carbon nanotubes, adding the carbon nanotubes into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 1% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifugal tube, centrifuging for 65min at 10000 r/min, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 60% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.1 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed during filtering, the dropping speed is controlled to be 0.5 drop/min, and a filter cake, namely the carbon nano tube composite membrane, is obtained after the filtering is finished;
s3, placing the carbon nano tube composite film in an acetone solution, standing for 10 minutes, and fishing out the solid insoluble film floating in the acetone solution by using a fine iron wire;
s4, repeating the step S3 for 2 times to obtain the carbon nano tube transparent film.
Comparative example 4
A preparation method of a carbon nano tube transparent film comprises the following steps:
s1, weighing 1g of carbon nanotubes, adding the carbon nanotubes into 100ml of distilled water in a 500ml beaker, uniformly stirring to obtain a carbon nanotube aqueous solution with the concentration of 1% (wt/vol), ultrasonically dispersing the carbon nanotube aqueous solution, adding the dispersed mixed solution into a centrifuge tube, centrifuging for 65min at 10500 rpm, taking supernatant liquid to obtain supernatant liquid, and dividing the supernatant liquid into a first supernatant liquid and a second supernatant liquid according to the volume, wherein the first supernatant liquid accounts for 60% of the volume of the supernatant liquid;
s2, filtering the first supernatant by using a mixed cellulose ester filtering membrane with the aperture of 0.1 mu m at normal temperature and normal pressure, wherein a vacuum pump is not needed for filtering during filtering, the dropping speed is controlled to be 0.5 drop/min, the solution after filtering is filtered to obtain a filter cake, at the moment, the solution is completely filtered to a filter bottle, and the filter cake is subjected to vacuum filtering by using a vacuum filtering pump to obtain the carbon nano tube composite film;
test method
The resistivity of the highly aligned carbon nanotube transparent films prepared in examples 1 to 5 and the resistivity of the carbon nanotube composite films prepared in comparative examples 1 to 4 were measured at 300k by a four-probe method, and the results are shown in fig. 4, which shows that the highly aligned carbon nanotube transparent films prepared by the present method have good conductivity.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A preparation method of a transparent film of highly oriented carbon nanotubes is characterized by comprising the following steps:
s1, performing ultrasonic dispersion on the carbon nanotube aqueous solution, performing centrifugal separation to obtain a supernatant, and dividing the supernatant into a first supernatant and a second supernatant;
s2, filtering the first supernatant with a filter membrane at normal temperature and normal pressure to obtain a filter cake, and performing vacuum filtration on the filter cake to obtain a carbon nano tube composite film;
s3, adding the carbon nano tube composite film into a solvent, dissolving the filter membrane in the step S2, and taking out solid insoluble substances to obtain the highly oriented carbon nano tube transparent film.
2. The method for preparing a highly aligned carbon nanotube transparent film according to claim 1, further comprising the steps of: s4, repeating the step S3 for 1-3 times.
3. The method for preparing a highly oriented carbon nanotube transparent film as claimed in claim 1, wherein the filter membrane is a mixed cellulose ester filter membrane.
4. The method for preparing a highly oriented carbon nanotube transparent film according to any one of claims 1-3, wherein the solvent comprises one or more of acetone and ethyl acetate.
5. The method of claim 1, wherein the concentration of the carbon nanotube solution is 0.4-1.0% (wt/vol).
6. The method as claimed in claim 1, wherein the rotation speed of the centrifugal separation is 10000-.
7. The method as claimed in claim 1, wherein the pore size of the filter membrane is not greater than 0.45 μm.
8. The method of claim 1, wherein the filtration time is less than 2 drops/min.
9. The method as claimed in claim 4, wherein the dissolving process in step S3 includes one or more of solvent still solution and solvent vapor distillation solution.
10. The method for preparing a highly aligned carbon nanotube transparent film as claimed in claim 1, wherein the first supernatant is 30-60% by volume of the supernatant.
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| CN115466544A (en) * | 2022-09-20 | 2022-12-13 | 青岛大学 | Preparation method of flexible electrode by utilizing magnetic induction carbon nano tube arrangement |
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