A method for preparing a PEDOT:PSS-based composite fiber having silver nanoparticles loaded on a surface

Abstract

The application discloses a preparation method of a PEDOT:PSS-based composite fiber loaded with silver nanoparticles on the surface. The method comprises the following steps: uniformly mixing a silver nanowire solution and a PEDOT:PSS solution, or uniformly mixing the silver nanowire solution, the PEDOT:PSS solution and a polymer solution to obtain a spinning solution; extruding the spinning solution into a coagulation bath through a wet spinning process and soaking to obtain a nascent composite fiber; and drying the nascent composite fiber to obtain a PEDOT:PSS-based composite fiber loaded with silver nanoparticles on the surface and containing silver nanowires in the interior. The structure of the PEDOT:PSS fiber in the interior and on the surface is simultaneously modified, the fiber contains a silver nanowire structure in the interior, and a silver nanoparticle structure exists on the surface of the fiber. The composite fiber has the characteristics of super-sensitive SERS sensing capability, high conductivity, electric heating, molten drop resistance and antibacterial property.

Description

Technical Field

[0001] This invention relates to the field of flexible sensors, specifically a method for preparing PEDOT:PSS-based composite fibers with silver nanoparticles loaded on their surface. Background Technology

[0002] To detect viruses, toxins, and human metabolites, high-performance sensors have been extensively developed, such as chemical sensors, fluorescence sensors, plasma sensors, and surface-enhanced Raman scattering (SERS) sensors. Among these, SERS sensors have attracted widespread attention due to their unique characteristics of high sensitivity, tagless operation, and non-destructive nature.

[0003] Currently, there are two main types of SERS substrates: solution-based substrates and solid substrates (including rigid and flexible substrates). The development of solution-based and rigid SERS substrates is highly susceptible to limitations imposed by sample pretreatment, in-situ, and real-time detection. Flexible film-based SERS substrates face challenges in terms of wearing comfort, and in severe cases, can even lead to skin inflammation. Flexible fiber SERS substrates, on the other hand, possess excellent breathability, which can significantly improve the wearing experience and has enormous potential for practical applications.

[0004] Typically, metal nanoparticles (gold, silver, etc.) are combined with textile fibers through methods such as impregnation, hot pressing, coating, and in-situ growth to serve as fiber-based SERS sensors. The patent "Fiber SERS Substrate Enriched with Plasmon Hot Spots and Its Preparation Method and Application" provides a simple and easy method for preparing a fiber SERS substrate enriched with plasmon hot spots, resulting in a fiber SERS substrate with high detection sensitivity. However, the bonding force between the metal nanomaterials and fibers in the fiber SERS substrate prepared by the above method is relatively weak, and the structural stability of the fiber-based SERS substrate still needs improvement. Therefore, there is an urgent need to develop a fiber SERS substrate with high stability and high sensitivity. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the technical problem this invention aims to solve is to provide a method for preparing PEDOT:PSS-based composite fibers with surface-loaded silver nanoparticles.

[0006] The technical solution of this invention to solve the aforementioned technical problem is to provide a method for preparing PEDOT:PSS-based composite fibers with surface-loaded silver nanoparticles, characterized in that the method includes the following steps:

[0007] (1) Mix the silver nanowire solution with the PEDOT:PSS solution evenly to obtain the spinning solution;

[0008] Alternatively, the silver nanowire solution, PEDOT:PSS solution and polymer solution can be mixed evenly to obtain a spinning solution;

[0009] (2) The spinning solution is extruded into the coagulation bath and soaked through a wet spinning process to obtain nascent composite fibers; then the nascent composite fibers are dried to obtain PEDOT:PSS-based composite fibers with silver nanoparticles loaded on the surface and silver nanowires inside.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] (1) This invention modifies both the internal and surface structure of PEDOT:PSS fibers. The fiber interior contains silver nanowire structures, and the fiber surface contains silver nanoparticle structures. The presence of silver nanoparticles on the fiber surface endows it with ultra-sensitive SERS sensing capabilities and excellent SERS detection performance, making it suitable as a flexible SERS substrate for use in high-performance flexible SERS sensors. Simultaneously, the fiber's complete silver nanowire structure provides more charge transport channels, resulting in extremely high electrical conductivity. Furthermore, this composite fiber possesses high electrical conductivity, electrothermal properties, drip resistance, and antibacterial properties, making it applicable to flexible wires, wearable electrothermal applications, antibacterial fields, healthcare devices, and wearable electronic information clothing.

[0012] (2) This invention combines wet spinning technology and drying technology, and uses silver nanowires to load silver nanoparticles on the surface of PEDOT:PSS-based fibers. The formation of Ag-S chemical bonds in the fiber structure strongly connects Ag and PEDOT:PSS, and the resulting composite fiber has higher structural stability.

[0013] (3) The appearance of silver nanoparticles can be attributed to the rapid evaporation of the solvent inside the fiber during the drying process and the interaction force between the silver nanowires and PEDOT:PSS, which forces the silver nanowire structure on the fiber surface to transform into a silver nanoparticle structure.

[0014] (4) The composite fiber of the present invention has ultra-high SERS detection sensitivity, enabling high-sensitivity detection of low-concentration target molecules, wherein the detection limit for Rhodamine 6G is 10. -11 M, Raman enhancement factor is 1.3 × 10 7 .

[0015] (5) The composite fiber of the present invention has more conductive channels inside, which improves the efficiency of electron transfer and promotes the improvement of conductivity. When the concentration of silver nanowires is 0.0667 g / ml, the conductivity of the composite fiber is 1019 S / cm, which has metal-level conductivity.

[0016] (6) The composite fiber of the present invention can be heated to 76.5°C in a short time (~70s) at 18V and maintain a stable surface temperature for a relatively long time (>1000s), which has excellent heating reliability and safety.

[0017] (7) The composite fiber of the present invention has excellent antibacterial and drip-resistant properties. Attached Figure Description

[0018] Figure 1 This is a SEM image of the surface of the composite fiber obtained in Example 1 of the present invention;

[0019] Figure 2 This is a SEM image of the cross-section of the composite fiber obtained in Example 1 of the present invention;

[0020] Figure 3 The composite fiber obtained in Example 1 of this invention is 10 -11 ~10 -9 Raman spectrum of Rhodamine 6G M;

[0021] Figure 4 This is a SERS detection reproducibility diagram of the composite fiber prepared in Example 1 of the present invention;

[0022] Figure 5 This is a SERS selectivity diagram of the composite fiber prepared in Example 1 of the present invention;

[0023] Figure 6 The conductivity diagram is shown for the composite fiber obtained in Example 1 of this invention.

[0024] Figure 7 This is a diagram showing the bending stability of the composite fiber obtained in Example 1 of the present invention.

[0025] Figure 8 The graph shows the electrothermal performance of the composite fiber obtained in Example 1 of this invention under different driving voltages.

[0026] Figure 9 This is a graph showing the heating stability of the composite fiber prepared in Example 1 of the present invention under a constant voltage of 18V.

[0027] Figure 10 Digital images of Escherichia coli and Staphylococcus aureus cultured on the composite fiber prepared in Example 1 of this invention;

[0028] Figure 11 This is a diagram of the melt-drip resistance test of the composite fiber obtained in Example 1 of the present invention;

[0029] Figure 12 This is a SEM image of the PEDOT:PSS fibers prepared in Comparative Example 1 of the present invention.

[0030] Figure 13 X-ray photoelectron spectra of the composite fiber prepared in Example 1 and the PEDOT:PSS fiber prepared in Comparative Example 1 of the present invention.

[0031] Figure 14 The composite fiber prepared in Example 1 of this invention and the PEDOT:PSS fiber prepared in Comparative Example 1 are 10 -5 Raman spectrum of Rhodamine 6G (R6G) of M;

[0032] Figure 15 This is a comparison chart of the electrical conductivity of the composite fiber prepared in Example 1 of the present invention and the PEDOT:PSS fiber prepared in Comparative Example 1. Detailed Implementation

[0033] Specific embodiments of the present invention are given below. These specific embodiments are only used to further illustrate the present invention in detail and do not limit the scope of protection of the claims of the present invention.

[0034] This invention provides a method for preparing PEDOT:PSS-based composite fibers with surface-loaded silver nanoparticles (hereinafter referred to as the method), characterized in that the method includes the following steps:

[0035] (1) Preparation of spinning solution: The silver nanowire solution was mixed with PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid) solution to obtain the spinning solution;

[0036] Alternatively, the silver nanowire solution, PEDOT:PSS solution and polymer solution can be mixed evenly to obtain a spinning solution;

[0037] Preferably, in step (1), the concentration of the silver nanowire solution is 25-100 mg / mL (preferably 30-80 mg / mL, more preferably 40-70 mg / mL), and the solvent is preferably deionized water; the concentration of the PEDOT:PSS solution is 30-80 mg / mL (preferably 45-60 mg / mL, more preferably 50-55 mg / mL), and the solvent is preferably deionized water; the volume ratio of the silver nanowire solution to the PEDOT:PSS solution is 1:1-2 (preferably 1:2).

[0038] Preferably, in step (1), the concentration of the polymer solution is 5-80 mg / mL (preferably 10-50 mg / mL, more preferably 15-30 mg / mL); the volume ratio of the silver nanowire solution, PEDOT:PSS solution and polymer solution is 1:1-2:0.3-0.5 (preferably 1:2:0.3).

[0039] Preferably, in step (1), the polymer is any one of PVA, PAN or PVP.

[0040] Preferably, in step (1), the length of the silver nanowire is 1 to 1000 μm and the diameter is 5 to 800 nm.

[0041] Preferably, in step (1), the process of uniform mixing is as follows: stirring at room temperature, stirring speed of 300-800 r / min, and stirring time of 30-180 min.

[0042] (2) Preparation of composite fibers by wet spinning: The spinning solution is squeezed into the coagulation bath and soaked through the wet spinning process to obtain nascent composite fibers; then the nascent composite fibers are dried to obtain PEDOT:PSS-based composite fibers (hereinafter referred to as composite fibers) with silver nanoparticles loaded on the surface and silver nanowires inside.

[0043] Preferably, in step (2), the wet spinning process is: the extrusion speed is 5-35 mL / h, and the spinning temperature is room temperature.

[0044] Preferably, in step (2), the coagulation bath is at least one of isopropanol, dimethyl sulfoxide, propanol, and ethylene glycol; wherein the volume ratio of isopropanol and dimethyl sulfoxide when compounded is 1 to 4:1. Through coagulation bath treatment, on the one hand, the spinning solution forms a gel and is shaped through a double diffusion process of solvent and non-solvent; on the other hand, PSS is partially removed and the PEDOT molecular chain becomes linear, which is beneficial for carrier transport, thereby promoting SERS and conductivity.

[0045] Preferably, in step (2), the soaking time is 2 to 36 hours (preferably 24 hours), and the soaking temperature is room temperature.

[0046] Preferably, in step (2), the drying temperature is 30-90℃ (preferably 50-60℃), the time is 5-90min (preferably 25-90min, more preferably 30-60min), and the heating rate is 1-10℃ / min (preferably 5℃ / min).

[0047] In this embodiment, the following detection method is used:

[0048] (1) SERS performance detection method: R6G solution was dropped onto the composite fiber, and the SERS detection sensitivity of the composite fiber to R6G molecules was tested by Raman spectroscopy.

[0049] (2) Method for testing electrical properties: Test the IV curve of the composite fiber, and measure the conductivity of the composite fiber based on the changes in resistance, fiber length and cross-sectional area.

[0050] (3) Methods for testing multifunctionality: a. Observe the electrothermal properties of composite fibers under different driving voltages; b. Test the antibacterial properties of composite fibers against Escherichia coli and Staphylococcus aureus; c. Test the resistance of composite fibers to melt dripping according to the combustion method.

[0051] Example 1:

[0052] (1) At room temperature, 1.4 mL of 0.0526 g / mL PEDOT:PSS solution and 0.6 mL of 0.0667 g / mL silver nanowire solution were placed in a heat-collecting constant temperature magnetic stirrer and stirred at 500 r / min for 60 min to mix evenly, which was used as the spinning solution.

[0053] (2) A mixture of isopropanol and dimethyl sulfoxide (volume ratio of 3:1) was used as a coagulation bath. At room temperature, the spinning solution was squeezed into the coagulation solution at a rate of 5 mL / h and soaked at room temperature for 24 h to obtain nascent composite fibers. The nascent composite fibers were then dried at 60℃ for 30 min with a heating rate of 5℃ / min to obtain PEDOT:PSS-based composite fibers with silver nanoparticles loaded on the surface and silver nanowires inside.

[0054] Depend on Figure 1 and Figure 2 It can be seen that the composite fiber prepared in Example 1 has a silver nanoparticle structure on its surface and a silver nanowire structure inside the fiber.

[0055] Depend on Figure 3 It can be seen that the composite fiber prepared in Example 1 can detect 10 -11 ~10 -9 M's R6G;

[0056] Depend on Figure 4 It can be seen that the composite fiber prepared in Example 1 has a good SERS detection reproducibility rate with a relative standard deviation of 8.57%.

[0057] Depend on Figure 5 It can be seen that the composite fiber prepared in Example 1 has excellent SERS detection selectivity and can simultaneously detect R6G and malachite green (MG) molecules.

[0058] Depend on Figure 6 It can be seen that the electrical conductivity of the composite fiber prepared in Example 1 is 1019 S / cm.

[0059] Depend on Figure 7 It can be seen that the electrical conductivity of the composite fiber prepared in Example 1 remains stable when bent, which also means that the composite fiber structure is stable.

[0060] Depend on Figure 8It can be seen that the composite fiber prepared in Example 1 generates different amounts of heat under different driving voltages, with the temperature reaching 76.5℃ within 70 seconds at 18V.

[0061] Depend on Figure 9 It can be seen that the composite fiber prepared in Example 1 has good temperature stability under a constant voltage of 18V.

[0062] Depend on Figure 10 It can be seen that the antibacterial band diameter of the composite fiber prepared in Example 1 is greater than 1 mm, indicating that the composite fiber has excellent antibacterial effect.

[0063] Depend on Figure 11 It can be seen that the composite fiber prepared in Example 1 did not exhibit any dripping phenomenon during the entire combustion process.

[0064] Testing showed that Example 1 performed well; the composite fiber used as a SERS substrate achieved a detection sensitivity of 10 for R6G. -11 M exhibits good SERS detection reproducibility with a relative standard deviation of 8.57%. Furthermore, this composite fiber demonstrates excellent SERS detection selectivity, enabling the simultaneous detection of R6G and MG molecules.

[0065] This composite fiber exhibits metallic-level electrical conductivity of 10¹⁹ S / cm, which remains stable even during bending. The composite fiber generates varying amounts of heat under different driving voltages; at 18V, the temperature reaches 76.5℃ within 70 seconds and maintains good temperature stability over a relatively long period (>1000 seconds). The composite fiber shows inhibition bands exceeding 1 mm in diameter against both *Escherichia coli* and *Staphylococcus aureus*, indicating excellent antibacterial effects. This composite fiber also exhibits resistance to melt dripping.

[0066] Comparative Example 1:

[0067] (1) At room temperature, 0.1052 g of PEDOT:PSS particles were added to 2 ml of deionized water and placed in a heat-collecting constant temperature magnetic stirrer. The mixture was stirred at 500 r / min for 30 min to obtain the spinning solution.

[0068] (2) The spinning solution was squeezed into the coagulation bath of isopropanol and dimethyl sulfoxide (volume ratio of 3:1) at a speed of 20 ml / h on a wet spinning machine. After soaking at room temperature for 24 h, the fiber was taken out and dried at 60℃ for 30 min. The heating rate was 5℃ / min to prepare PEDOT:PSS fiber.

[0069] Depend on Figure 12 It can be seen that the PEDOT:PSS fiber prepared in Comparative Example 1 has slight indentations on its surface, which is caused by the rapid evaporation of the solvent inside the fiber during the drying process.

[0070] Depend on Figure 13 It can be seen that the composite fiber structure prepared in Example 1 is stable, which is due to the generation of strong Ag-S chemical bonds on its surface.

[0071] Depend on Figure 14 It can be seen that the PEDOT:PSS fibers prepared in Comparative Example 1 have a growth rate of 613 cm⁻¹. -1 There is a significant R6G signal, which is about 3 times lower than that of the composite fiber in Example 1.

[0072] Depend on Figure 15 It can be seen that the electrical conductivity of the PEDOT:PSS fiber prepared in Comparative Example 1 is 239 S / cm, which is about 5 times lower than that of the composite fiber in Example 1.

[0073] Testing revealed that the SERS performance of the PEDOT:PSS fiber prepared in Comparative Example 1 was lower than that of the composite fiber; its electrical conductivity was only 239 S / cm, which was at least 5 times lower than that of the composite fiber; when heated to 42℃ within 70 seconds at 18V, it was resistant to melting and dripping but had no obvious antibacterial effect.

[0074] Example 2:

[0075] (1) At room temperature, 1.4 mL of 0.06 g / mL PEDOT:PSS solution and 0.6 mL of 0.04 g / mL silver nanowire solution were stirred at 600 r / min for 80 min to mix evenly, and this mixture was used as the spinning solution.

[0076] (2) A mixture of isopropanol and dimethyl sulfoxide (volume ratio of 2:1) was used as a coagulation bath. At room temperature, the spinning solution was squeezed into the coagulation solution at a rate of 8 mL / h and soaked at room temperature for 20 h to obtain nascent composite fibers. The nascent composite fibers were then dried at 50 °C for 40 min with a heating rate of 3 °C / min to obtain PEDOT:PSS-based composite fibers with silver nanoparticles loaded on the surface and silver nanowires inside.

[0077] Testing showed that Example 2 performed well, with the composite fiber exhibiting a detection sensitivity of 10 for R6G. -11 The M-type composite fiber exhibits excellent SERS detection reproducibility with a relative standard deviation of 9.1%. Furthermore, it demonstrates superior selectivity, enabling the simultaneous detection of R6G and MG molecules. This composite fiber also possesses metallic-level conductivity of 938 S / cm, maintaining stability even during bending. The fiber generates varying amounts of heat under different driving voltages, reaching 68°C within 70 seconds at 18V with good temperature stability. The composite fiber exhibits inhibition bands exceeding 1 mm in diameter against both *Escherichia coli* and *Staphylococcus aureus*, indicating excellent antibacterial efficacy. Finally, the composite fiber demonstrates resistance to melt-drip reactions.

[0078] Example 3:

[0079] (1) At room temperature, mix 2 mL of 0.05 g / mL PEDOT:PSS solution, 1 mL of 0.06 g / mL silver nanowire solution and 0.5 mL of 0.02 g / mL PVA aqueous solution at a speed of 600 r / min for 60 min to obtain a spinning solution.

[0080] (2) A mixture of isopropanol and dimethyl sulfoxide (volume ratio of 3:1) was used as a coagulation bath. At room temperature, the spinning solution was extruded into the coagulation solution at a rate of 15 mL / h and soaked at room temperature for 24 h to obtain nascent composite fibers. The nascent composite fibers were then dried at 60 °C for 40 min with a heating rate of 5 °C / min to obtain PEDOT:PSS-based composite fibers with silver nanoparticles loaded on the surface and silver nanowires inside.

[0081] Testing showed that Example 3 performed well, with the composite fiber exhibiting a detection sensitivity of 10 for R6G. -10 The M-type composite fiber exhibits good SERS detection reproducibility with a relative standard deviation of 9%. Furthermore, it can simultaneously detect R6G and MG molecules. This composite fiber also possesses excellent electrical conductivity, reaching 800 S / cm, which remains stable even when bent. The composite fiber generates varying amounts of heat under different driving voltages; at 18V, the temperature can reach 56℃ within 70 seconds with good temperature stability. The composite fiber shows inhibition bands exceeding 1 mm in diameter against both *Escherichia coli* and *Staphylococcus aureus*, indicating excellent antibacterial effects. This composite fiber also exhibits resistance to melt-drip reactions.

[0082] Example 4:

[0083] (1) At room temperature, 2 mL of 0.05 g / mL PEDOT:PSS solution, 1 mL of 0.06 g / mL silver nanowire solution and 0.3 mL of 0.03 g / mL PAN aqueous solution were stirred at 500 r / min for 80 min to mix evenly, and this mixture was used as the spinning solution.

[0084] (2) A mixture of isopropanol and dimethyl sulfoxide (volume ratio of 3:1) was used as a coagulation bath. At room temperature, the spinning solution was extruded into the coagulation solution at a rate of 10 mL / h and soaked at room temperature for 24 h to obtain nascent composite fibers. The nascent composite fibers were then dried at 60 °C for 30 min with a heating rate of 6 °C / min to obtain PEDOT:PSS-based composite fibers with silver nanoparticles loaded on the surface and silver nanowires inside.

[0085] Testing showed that Example 4 performed well, with the composite fiber exhibiting a detection sensitivity of 10 for R6G. -10M exhibits good SERS detection reproducibility with a relative standard deviation of 8.2%. Furthermore, this composite fiber demonstrates excellent selectivity and can simultaneously detect R6G and MG molecules. Its conductivity is approximately 890 S / cm. The inhibition band diameter of this composite fiber against both *Escherichia coli* and *Staphylococcus aureus* is greater than 1 mm, indicating excellent antibacterial effects. This composite fiber also exhibits melt-drip resistance.

[0086] Example 5:

[0087] (1) At room temperature, mix 2 mL of 0.05 g / mL PEDOT:PSS solution, 1 mL of 0.05 g / mL silver nanowire solution and 0.5 mL of 0.015 g / mL PVA aqueous solution at a speed of 600 r / min for 90 min to obtain a spinning solution.

[0088] (2) A mixture of isopropanol and dimethyl sulfoxide (volume ratio of 3:1) was used as a coagulation bath. At room temperature, the spinning solution was squeezed into the coagulation solution at a rate of 5 mL / h and soaked at room temperature for 24 h to obtain nascent composite fibers. The nascent composite fibers were then dried at 50 °C for 30 min with a heating rate of 5 °C / min to obtain PEDOT:PSS-based composite fibers with silver nanoparticles loaded on the surface and silver nanowires inside.

[0089] Testing showed that Example 5 performed well, with the composite fiber exhibiting a detection sensitivity of 10 for R6G. -10 M exhibits good SERS detection reproducibility with a relative standard deviation of 9.5%. Furthermore, this composite fiber demonstrates excellent selectivity and can simultaneously detect R6G and MG molecules. Its conductivity is approximately 620 S / cm. The inhibition band diameter of this composite fiber against both *Escherichia coli* and *Staphylococcus aureus* is greater than 1 mm, indicating excellent antibacterial effects. This composite fiber also exhibits melt-drip resistance.

[0090] Any aspects not covered in this invention are applicable to existing technologies.

Claims

1. A method for preparing a PEDOT:PSS-based composite fiber surface-loaded with silver nanoparticles, characterized by, The method comprises the following steps: (1) uniformly mixing a silver nanowire solution and a PEDOT:PSS solution to obtain a spinning solution; or uniformly mixing the silver nanowire solution, the PEDOT:PSS solution and a polymer solution to obtain the spinning solution; The silver nanowire has a length of 1-1000 μm and a diameter of 5-800 nm; and the polymer is any one of PVA, PAN or PVP; The volume ratio of the silver nanowire solution, the PEDOT:PSS solution and the polymer solution is 1:1-2:0.3-0.5; (2) extruding the spinning solution into a coagulation bath through a wet spinning process and soaking to obtain a nascent composite fiber; and drying the nascent composite fiber to obtain a PEDOT:PSS-based composite fiber with silver nanoparticles loaded on the surface and containing silver nanowires in the interior; The coagulation bath is a compound of isopropyl alcohol and dimethyl sulfoxide, and the volume ratio of the isopropyl alcohol and the dimethyl sulfoxide is 1-4:1 when they are compounded. The drying temperature is 30-90 ℃, the drying time is 5-90 min, and the temperature rising rate is 1-10 ℃ / min.

2. The method for preparing a PEDOT:PSS-based composite fiber surface-loaded with silver nanoparticles according to claim 1, characterized by, In step (1), the concentration of the silver nanowire solution is 25-100 mg / mL; the concentration of the PEDOT:PSS solution is 30-80 mg / mL; and the volume ratio of the silver nanowire solution to the PEDOT:PSS solution is 1:1-2.

3. The method for preparing a PEDOT:PSS-based composite fiber surface-loaded with silver nanoparticles according to claim 2, characterized by, In step (1), the concentration of the polymer solution is 5-80 mg / mL.

4. The method for preparing PEDOT:PSS-based composite fibers with surface-loaded silver nanoparticles according to claim 1, characterized in that, In step (1), the uniform mixing process is stirring at room temperature, the stirring speed is 300-800 r / min, and the stirring time is 30-180 min.

5. The method for preparing PEDOT:PSS-based composite fibers with surface-loaded silver nanoparticles according to claim 1, characterized in that, In step (2), the wet spinning process is that the extrusion speed is 5-35 mL / h, and the spinning temperature is room temperature.

6. The method for preparing PEDOT:PSS-based composite fibers with surface-loaded silver nanoparticles according to claim 1, characterized in that, In step (2), the soaking time is 2-36 h, and the soaking temperature is room temperature.

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