Preparation method of SWCNT and aramid fiber composite thermoelectric material

Abstract

The invention discloses a preparation method of a SWCNT and aramid fiber composite thermoelectric material, which comprises the following steps: a, mixing an aramid fiber solid and a dimethyl sulfoxide solvent, and adding a potassium hydroxide solution to obtain an aramid fiber solution; b, adding an aramid fiber solution and a single-walled carbon nanotube into an ethanol or dimethyl sulfoxide solution, and mixing to obtain a mixed dispersion liquid precursor of SWCNT and aramid fibers; and c, carrying out uniform ultrasonic dispersion on the mixed dispersion liquid precursor of the SWCNT and the aramid fiber, carrying out vacuum filtration, and drying to obtain the p-type or n-type aramid fiber / SWCNT composite thermoelectric film. The aramid fibers are introduced into the SWCNT matrix, agglomeration of the SWCNT can be effectively inhibited, a continuous conductive network is formed, carrier transport is promoted by means of regular arrangement of aramid fiber molecular chains, and the prepared composite thermoelectric thin film has excellent conductivity and Seebeck coefficient and has high temperature resistance and high flame retardance.

Description

Technical Field

[0001] This invention relates to the field of thermoelectric materials technology, and more specifically to a method for preparing a thermoelectric material composed of SWCNT and aramid fiber. Background Technology

[0002] Thermoelectric materials enable the direct conversion between thermal and electrical energy, demonstrating enormous application potential in fields such as waste heat recovery power generation and solid-state refrigeration, making them one of the key materials for solving current energy and environmental problems. In recent years, with the rapid development of wearable and portable electronic devices, the demand for flexible thermoelectric materials and devices has become increasingly urgent. Flexible thermoelectric thin films, as the core component of flexible thermoelectric devices, need to possess both excellent thermoelectric properties and good mechanical properties to meet the various complex operating conditions in practical applications. Furthermore, the combination of high-temperature resistance and flame retardant properties is also extremely important for the application of composite thermoelectric thin films in high-temperature scenarios.

[0003] Aramid fiber, as a high-performance organic fiber, possesses many outstanding properties. From a chemical structure perspective, its molecular chain contains a large number of aromatic rings and amide bonds, which endow the fiber with high strength and high modulus. Aramid fiber also has excellent high-temperature resistance and flame retardant properties. However, aramid fiber itself does not possess thermoelectric properties, and its application in composite thermoelectric thin film materials has not yet been fully developed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a thermoelectric material composed of SWCNT and aramid fiber, so as to prepare a composite thermoelectric film with low cost and high thermoelectric performance, high temperature resistance and flame retardancy.

[0005] To solve the above-mentioned technical problems, the present invention provides a method for preparing a thermoelectric material composite of SWCNT and aramid fiber, comprising:

[0006] a. Mix solid aramid fiber and dimethyl sulfoxide solvent, then add potassium hydroxide solution to obtain aramid fiber solution;

[0007] b. Mix the aramid fiber solution and single-walled carbon nanotubes in ethanol or dimethyl sulfoxide solution to obtain a mixed dispersion precursor of SWCNT and aramid fiber;

[0008] c. After ultrasonically dispersing the precursor of the mixed dispersion of SWCNT and aramid fiber, vacuum filter and dry it to obtain the aramid fiber / SWCNT composite thermoelectric film.

[0009] The further technical solution is as follows: after c, it also includes: d, cold pressing the aramid fiber / SWCNT composite thermoelectric film.

[0010] The further technical solution is as follows: In the d-step, during the cold pressing process, the cold pressing strength is 10-30 MPa and the processing time is 1-10 min.

[0011] Its further technical solution is as follows: b specifically includes:

[0012] b1. Add single-walled carbon nanotubes to ethanol solvent or dimethyl sulfoxide solution to obtain SWCNT dispersion;

[0013] b2. Add the aramid fiber solution to the SWCNT dispersion and mix to obtain a mixed dispersion precursor of SWCNT and aramid fibers.

[0014] The further technical solution is as follows: in b2, the mass fraction of aramid fiber is 2wt%, 5w%, 7w%, 9w%, 11.76w%, 14w%, 16w%, 20w%, and 24w%.

[0015] Its further technical solution is as follows: c specifically includes:

[0016] c1. The precursor of the mixed dispersion of SWCNT and aramid fiber is ultrasonically dispersed.

[0017] c2. The ultrasonically dispersed SWCNT and aramid fiber mixed dispersion precursor is vacuum filtered to obtain composite thermoelectric material.

[0018] c3. The composite thermoelectric material obtained by vacuum filtration is dried to obtain an aramid fiber / SWCNT composite thermoelectric film.

[0019] The further technical solution is as follows: In c1, the mixed dispersion precursor of SWCNT and aramid fiber is ultrasonically dispersed in an ice-water bath for 20-60 minutes.

[0020] The further technical solution is as follows: In c3, the vacuum drying temperature is 50-90℃ and the vacuum drying time is 4-12h.

[0021] Its further technical solution is as follows: a specifically includes:

[0022] a1. Mix solid aramid fiber with dimethyl sulfoxide solvent to obtain aramid fiber dispersion;

[0023] a2. Dissolve solid potassium hydroxide in water to obtain a potassium hydroxide solution;

[0024] a3. Mix the aramid fiber dispersion and potassium hydroxide solution to obtain the aramid fiber solution.

[0025] The further technical solution is as follows: In a1, 60 mg of aramid fiber solid and 60 mL of dimethyl sulfoxide solvent are mixed to obtain an aramid fiber dispersion with a concentration of 1 mg / mL; in a2, 60 mg of potassium hydroxide solid is dissolved in 1-6 mL of deionized water to obtain a potassium hydroxide solution.

[0026] The beneficial technical effects of this invention are as follows: Compared with the prior art, this invention effectively inhibits the aggregation of SWCNTs by introducing aramid fibers into the SWCNT matrix, forming a continuous conductive network. The regular arrangement of aramid fiber molecular chains can form a more regular and stable structure, promoting carrier transport. The prepared aramid fiber / SWCNT composite thermoelectric film has excellent electrical conductivity and Seebeck coefficient. At the same time, the aramid fiber content can be controlled to achieve the transformation of the composite thermoelectric film from p-type to n-type. In addition, the aramid fiber / SWCNT composite thermoelectric film also has the excellent mechanical strength and thermal stability (high temperature resistance and high flame retardancy) of aramid fibers, that is, it has both high temperature resistance and high flame retardancy as well as high thermoelectric performance. Furthermore, the performance of SWCNTs is improved by controlling the aramid fiber content and by vacuum filtration and drying during the preparation process. The process is relatively simple and low in cost. Attached Figure Description

[0027] Figure 1 This is a schematic flowchart of a method for preparing a thermoelectric material composed of SWCNT and aramid fiber according to the present invention.

[0028] Figure 2 This is a schematic diagram of a sub-process of the preparation method of a thermoelectric material composed of SWCNT and aramid fiber according to the present invention.

[0029] Figure 3 This is another schematic diagram of the process for preparing a thermoelectric material composed of SWCNT and aramid fiber according to the present invention.

[0030] Figure 4 These are actual images of the aramid fiber / SWCNT composite thermoelectric film prepared in Example 1 of this invention before and after combustion.

[0031] Figure 5 yes Figure 4 The image shown is a cross-sectional scanning electron microscope image of the aramid fiber / SWCNT composite thermoelectric film before combustion.

[0032] Figure 6 yes Figure 4 The image shown is a cross-sectional scanning electron microscope image of the aramid fiber / SWCNT composite thermoelectric film after combustion. Detailed Implementation

[0033] To enable those skilled in the art to more clearly understand the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] Reference Figure 1 , Figure 1 This is a schematic flowchart illustrating the preparation method of the thermoelectric material composite of SWCNT and aramid fiber according to the present invention. In the embodiment shown in the figure, the preparation method of the thermoelectric material composite of SWCNT and aramid fiber includes:

[0035] S101. Mix solid aramid fiber and dimethyl sulfoxide solvent, then add potassium hydroxide solution to obtain aramid fiber solution.

[0036] The specific steps include: mixing solid aramid fibers with dimethyl sulfoxide solvent to obtain an aramid fiber dispersion; dissolving solid potassium hydroxide (KOH) in water to obtain a potassium hydroxide solution; and mixing the aramid fiber dispersion and the potassium hydroxide solution to obtain an aramid fiber solution.

[0037] The concentration of the aramid fiber dispersion can be 1 mg / mL. For example, in this embodiment, 60 mg of solid aramid fiber can be added to 60 mL of dimethyl sulfoxide solvent, mixed evenly and stirred thoroughly to obtain an aramid fiber dispersion with a concentration of 1 mg / mL. Then, 60 mg of solid potassium hydroxide can be dissolved in 1-6 mL of deionized water and placed on a magnetic stirrer for thorough stirring to obtain a potassium hydroxide solution. The volume of deionized water can be 1 mL, 3 mL, or 6 mL, preferably 3 mL. The aramid fiber dispersion is then added to the potassium hydroxide solution and placed on a magnetic stirrer for stirring to ensure thorough mixing and obtain an aramid fiber solution.

[0038] S102. Aramid fiber solution and single-walled carbon nanotubes are added to ethanol or dimethyl sulfoxide solution and mixed to obtain a mixed dispersion precursor of SWCNT and aramid fiber.

[0039] Specifically, such as Figure 2 As shown, this step includes:

[0040] S1021. Add single-walled carbon nanotubes to ethanol solvent or dimethyl sulfoxide solution to obtain SWCNT dispersion.

[0041] In this step, single-walled carbon nanotubes can be added to an ethanol solvent or a dimethyl sulfoxide solution, preferably to an ethanol solvent.

[0042] S1022. Add the aramid fiber solution to the SWCNT dispersion and mix to obtain a mixed dispersion precursor of SWCNT and aramid fibers.

[0043] In this step, the aramid fiber solution can be added to the SWCNT dispersion in proportion, and the mass fraction of the aramid fiber can be 2 wt%, 5 wt%, 7 wt%, 9 wt%, 11.76 wt%, 14 wt%, 16 wt%, 20 wt%, and 24 wt%, preferably 2 wt%, 5 wt%, 7 wt%, 9 wt%, 11.76 wt%, and 14 wt%.

[0044] Furthermore, the mixture can be placed on a magnetic stirrer and stirred for 15 min, 30 min, 45 min, and 60 min.

[0045] S103. After ultrasonically dispersing the mixed dispersion of SWCNT and aramid fiber precursor evenly, vacuum filter and dry to obtain aramid fiber / SWCNT composite thermoelectric film.

[0046] In this invention, the precursor of the mixed dispersion of SWCNT and aramid fiber is ultrasonically dispersed evenly and then vacuum filtered and dried to obtain a p-type aramid fiber / SWCNT composite thermoelectric film or an n-type aramid fiber / SWCNT composite thermoelectric film. It can be understood that the p-type to n-type conversion can be achieved by adjusting the content of aramid fiber.

[0047] Specifically, such as Figure 3 As shown, this step includes:

[0048] S1031. The precursor of the mixed dispersion of SWCNT and aramid fiber is ultrasonically dispersed.

[0049] In this step, the precursor of the mixed dispersion of SWCNT and aramid fibers is placed in an ice-water bath and ultrasonically dispersed using a cell disruptor for 20-60 minutes. Understandably, in some other embodiments, the precursor of the mixed dispersion of SWCNT and aramid fibers can be ultrasonically dispersed at room temperature.

[0050] S1032. The precursor of the ultrasonically dispersed SWCNT and aramid fiber mixture is vacuum filtered to obtain the composite thermoelectric material.

[0051] S1033. The composite thermoelectric material obtained by vacuum filtration is dried to obtain a p-type or n-type aramid fiber / SWCNT composite thermoelectric film.

[0052] In this step, the vacuum drying temperature can be 50-90℃, for example, 50℃, 60℃, 70℃, 80℃ and 90℃, preferably 60℃; the vacuum drying time can be 4-12h, for example, 4h, 6h, 8h and 12h, preferably 4h.

[0053] S104. The aramid fiber / SWCNT composite thermoelectric film is subjected to cold pressing treatment.

[0054] In this step, the p-type or n-type aramid fiber / SWCNT composite thermoelectric film is subjected to cold pressing. During the process, the cold pressing strength can be 10-30 MPa, for example, 10 MPa, 15 MPa, 20 MPa, 25 MPa, or 30 MPa, preferably 20 MPa; the processing time is 1-10 min, for example, 1 min, 3 min, 5 min, or 10 min, preferably 3 min.

[0055] In this invention, cold pressing can further optimize the density of the film, increasing the conductivity by 50%-200%.

[0056] The preparation method of the thermoelectric material composed of SWCNT and aramid fiber of the present invention is described below with reference to specific embodiments.

[0057] Example 1

[0058] (1) Dissolve 60 mg of aramid fiber solid in 60 mL of dimethyl sulfoxide solution and mix rapidly and stir evenly to obtain aramid fiber dispersion; weigh 60 mg of KOH solid and dissolve it in 3 mL of water to obtain potassium hydroxide solution; mix the aramid fiber dispersion and potassium hydroxide solution thoroughly and stir on a magnetic stirrer for 24 hours to obtain 1 mg / mL aramid fiber solution.

[0059] (2) Add 15mg of SWCNT powder to 40mL of ethanol solution, and place the solution in an ice-water bath for ultrasonic dispersion for 40min to obtain SWCNT dispersion.

[0060] (3) Measure the aramid fiber solution in (1) and add it to the dispersion in (2) above to obtain a mixed dispersion precursor of SWCNT and aramid fiber. Place the mixed dispersion precursor on a magnetic stirrer and stir at room temperature for 30 min.

[0061] (4) Place the liquid stirred in (3) in an ice water bath and use a cell disruptor to ultrasonically disperse it for 40 minutes.

[0062] (5) Vacuum filter the ultrasonically dispersed SWCNT and aramid fiber mixture precursor to obtain p-type or n-type composite thermoelectric material.

[0063] (6) The product obtained by vacuum filtration in (5) is vacuum dried at 70°C for 6 hours to obtain a p-type or n-type aramid fiber / SWCNT composite thermoelectric film.

[0064] In this embodiment, if the mass fraction of aramid fiber added in (3) is 2w%, the conductivity of the uncold-pressed aramid fiber / SWCNT composite film is 1434.98±21Scm.-1 The Seebeck coefficient is 39.22 ± 1.6 μVK. -1 The power factor value is 218.26 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 5 wt%, the conductivity of the uncold-pressed aramid fiber / SWCNT composite film is 828.48 ± 8 Scm. -1 The Seebeck coefficient is 42.45 ± 0.9 μVK. -1 The power factor value is 153.1 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 7wt%, the conductivity of the resulting aramid fiber / SWCNT composite thermoelectric film is 752.30±1.8Scm. -1 The Seebeck coefficient is 14.97 ± 2.4 μVK. -1 The power factor value is 16.86 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 9 wt%, the conductivity of the resulting aramid fiber / SWCNT composite thermoelectric film is 690.77 ± 12.3 S cm. -1 The Seebeck coefficient is -12.29 ± 1.2 μVK. -1 The power factor value is 10.43 μWm. -1 K -2 590.77±0.8Scm -1 The Seebeck coefficient is -12.29 ± 0.6 μVK. -1 The power factor is 8.5 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 11.76 wt%, the conductivity of the resulting aramid fiber / SWCNT composite thermoelectric film is 755.28 ± 9.08 Scm. -1 The Seebeck coefficient is -39.35 ± 0.3 μVK. -1 The power factor value is 116.95 μWm. -1 K -2 ; and such Figure 4 , Figure 5 and Figure 6As shown, when the mass fraction of aramid fiber added is 11.76 wt%, the aramid fiber / SWCNT composite thermoelectric film prepared is burned on an alcohol lamp. The flame temperature of the alcohol lamp can reach over 200°C. After burning, the shape and microstructure of the aramid fiber / SWCNT composite thermoelectric film do not change much, and it has flame-retardant and high-temperature resistance (temperature resistance > 200°C), that is, it has better thermal stability. If the mass fraction of aramid fiber added in (3) is 14 wt%, the conductivity of the aramid fiber / SWCNT composite thermoelectric film prepared is 606.72 ± 2.1 S cm. -1 The Seebeck coefficient is -28.81 ± 3.3 μVK. -1 The power factor value is 50.36 μWm. -1 K -2 .

[0065] Example 2

[0066] The method is similar to that in Example 1, except that step (7) is added to perform cold pressing on the aramid fiber / SWCNT composite thermoelectric film. The cold pressing strength is 20 MPa and the processing time is 3 min.

[0067] In this embodiment, if the mass fraction of aramid fiber added in (3) is 2wt%, the conductivity of the resulting aramid fiber / SWCNT composite film is 2241.73±14.9Scm. -1 The Seebeck coefficient is 37.41 ± 1.3 μVK. -1 The power factor value is 313.73 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 5 wt%, the conductivity of the resulting aramid fiber / SWCNT composite film is 1380.45 ± 35.7 Scm. -1 The Seebeck coefficient is 41.1 ± 0.9 μVK. -1 Power factor value 233.18 μWm -1 K -2 If the mass fraction of aramid fiber added in (3) is 7wt%, the conductivity of the resulting aramid fiber / SWCNT composite thermoelectric film is 1017.25±10.8Scm. -1 The Seebeck coefficient is 15.27 ± 0.4 μVK. -1 The power factor value is 23.72 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 11.76 wt%, the conductivity of the resulting aramid fiber / SWCNT composite thermoelectric film is 1537.87 ± 4.1 S cm. -1The Seebeck coefficient is -39.04 ± 0.8 μVK. -1 The power factor value is 234.39 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 14wt%, the conductivity of the resulting aramid fiber / SWCNT composite thermoelectric film is 1005.32±3.4Scm. -1 The Seebeck coefficient is -26.04 ± 1.1 μVK. -1 The power factor value is 68.17 μWm. -1 K -2 Compared with Example 1, it can be seen that adding the cold pressing step can improve the conductivity of the composite film.

[0068] Example 3

[0069] The method is similar to that in Example 1, except that the 40 mL ethanol solution in step (2) is replaced with 40 mL dimethyl sulfoxide solution.

[0070] In this embodiment, if the mass fraction of aramid fiber added in (3) is 2wt%, the conductivity of the uncold-pressed aramid fiber / SWCNT composite film is 917.29±15.3Scm. -1 The Seebeck coefficient is 43.71 ± 0.4 μVK. -1 The power factor value is 175.57 μWm. -1 K -2 If the mass fraction of aramid fiber added in (3) is 5 wt%, the conductivity of the resulting aramid fiber / SWCNT composite film is 747.89 ± 4.1 S cm. -1 The Seebeck coefficient is 44.76 ± 1.5 μVK. -1 The power factor value is 149.84 μWm. -1 K -2 .

[0071] Example 4

[0072] The method is similar to that in Example 3, except that step (7) is added to perform cold pressing on the aramid fiber / SWCNT composite thermoelectric film. The cold pressing strength is 20 MPa and the processing time is 3 min.

[0073] In this embodiment, if the mass fraction of aramid fiber added in (3) is 2wt%, the conductivity of the resulting aramid fiber / SWCNT composite film is 1304.23±27.5Scm. -1 The Seebeck coefficient is 42.02 ± 1.1 μVK. -1 The power factor value is 230.28 μWm. -1K -2 If the mass fraction of aramid fiber added in (3) is 5 wt%, the conductivity of the resulting aramid fiber / SWCNT composite film is 1157.89 ± 40.8 Scm. -1 The Seebeck coefficient is 43.67 ± 1.9 μVK. -1 Power factor value 220.82 μWm -1 K -2 .

[0074] In summary, this invention introduces aramid fibers into the SWCNT system to construct a composite thermoelectric film, achieving the preparation of a composite material with excellent mechanical and thermoelectric properties, high-temperature resistance, and flame retardancy. Specifically, by introducing aramid fibers into the SWCNT matrix, the aggregation of SWCNTs can be effectively suppressed, forming a continuous conductive network. The regular arrangement of aramid fiber molecular chains can form a more regular and stable structure, promoting carrier transport. The prepared aramid fiber / SWCNT composite thermoelectric film exhibits superior conductivity and Seebeck coefficient, and by adjusting… Controlling the content of aramid fibers can achieve the transformation from p-type to n-type. At the same time, the aramid fiber / SWCNT composite thermoelectric film also has the excellent mechanical strength and thermal stability of aramid fibers (high temperature resistance and high flame retardancy). That is, it has both high temperature resistance and high flame retardancy as well as high thermoelectric performance. In addition, the conductivity and Seebeck coefficient are optimized by solvent system regulation and cold pressing during the preparation process. The thermoelectric performance of the composite thermoelectric material is improved by multi-angle synergistic optimization. The preparation is carried out by ultrasonic stirring, vacuum filtration and vacuum drying, which is relatively simple and low cost.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent variations or modifications made within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. A method for preparing a thermoelectric material composite of SWCNT and aramid fiber, characterized in that, include: a. Mix solid aramid fiber and dimethyl sulfoxide solvent, then add potassium hydroxide solution to obtain aramid fiber solution; b. Mix the aramid fiber solution and single-walled carbon nanotubes in ethanol or dimethyl sulfoxide solution to obtain a mixed dispersion precursor of SWCNT and aramid fiber; c. After ultrasonically dispersing the precursor of the mixed dispersion of SWCNT and aramid fiber, vacuum filter and dry it to obtain the aramid fiber / SWCNT composite thermoelectric film.

2. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 1, characterized in that, Following c, the process also includes d, cold pressing the aramid fiber / SWCNT composite thermoelectric film.

3. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 2, characterized in that, In step d, during cold pressing, the cold pressing strength is 10-30 MPa, and the processing time is 1-10 min.

4. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 1, characterized in that, Specifically, b includes: b1. Add single-walled carbon nanotubes to ethanol solvent or dimethyl sulfoxide solution to obtain SWCNT dispersion; b2. Add the aramid fiber solution to the SWCNT dispersion and mix to obtain a mixed dispersion precursor of SWCNT and aramid fibers.

5. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 4, characterized in that, In b2, the mass fraction of aramid fiber is 2wt%, 5w%, 7w%, 9w%, 11.76w%, 14w%, 16w%, 20w%, and 24w.

6. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 1, characterized in that, The c specifically includes: c1. The precursor of the mixed dispersion of SWCNT and aramid fiber is ultrasonically dispersed. c2. The ultrasonically dispersed SWCNT and aramid fiber mixed dispersion precursor is vacuum filtered to obtain composite thermoelectric material. c3. The composite thermoelectric material obtained by vacuum filtration is dried to obtain an aramid fiber / SWCNT composite thermoelectric film.

7. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 6, characterized in that, In step c1, the precursor of the mixed dispersion of SWCNT and aramid fiber is ultrasonically dispersed in an ice-water bath for 20-60 minutes.

8. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 6, characterized in that, In c3, the vacuum drying temperature is 50-90℃ and the vacuum drying time is 4-12h.

9. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 1, characterized in that, The term 'a' specifically includes: a1. Mix solid aramid fiber with dimethyl sulfoxide solvent to obtain aramid fiber dispersion; a2. Dissolve solid potassium hydroxide in water to obtain a potassium hydroxide solution; a3. Mix the aramid fiber dispersion and potassium hydroxide solution to obtain the aramid fiber solution.

10. The method for preparing the thermoelectric material composite of SWCNT and aramid fiber as described in claim 9, characterized in that, In step a1, 60 mg of aramid fiber solid and 60 mL of dimethyl sulfoxide solvent are mixed to obtain an aramid fiber dispersion with a concentration of 1 mg / mL; in step a2, 60 mg of potassium hydroxide solid is dissolved in 1-6 mL of deionized water to obtain a potassium hydroxide solution.

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