CN114220906A - Water-based cosolvent-processed PEDOT (Polytetrafluoroethylene)/PSS (Polytetrafluoroethylene) flexible thermoelectric film and preparation method thereof - Google Patents

Water-based cosolvent-processed PEDOT (Polytetrafluoroethylene)/PSS (Polytetrafluoroethylene) flexible thermoelectric film and preparation method thereof Download PDF

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CN114220906A
CN114220906A CN202111520373.8A CN202111520373A CN114220906A CN 114220906 A CN114220906 A CN 114220906A CN 202111520373 A CN202111520373 A CN 202111520373A CN 114220906 A CN114220906 A CN 114220906A
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pedot
pss
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张荔
刘星宇
张�杰
杨艳玲
侯小江
叶晓慧
锁国权
夏斌杰
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Shaanxi University of Science and Technology
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Abstract

The invention provides a PEDOT (PolyEthylenediamine) PSS (PolyEthylenediamine) flexible thermoelectric film treated by a water-based cosolvent and a preparation method thereof, belonging to the field of preparation of flexible thermoelectric materials, wherein the method comprises the following steps: uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A; soaking the compound A in a mixed solution of an organic polar solvent and deionized water, increasing the proportion of dual-polarized PEDOT in the PEDOT and PSS film, and taking out to obtain a compound B; and removing the N, N-dimethylacetamide and the deionized water in the compound B, and then removing the substrate to obtain the PEDOT/PSS flexible thermoelectric film. The PEDOT/PSS film is processed by an organic polar solvent N, N-dimethylacetamide and pure water in one step, and the carrier type of PEDOT molecules is changed, so that the conductivity and the power factor of the film are improved.

Description

Water-based cosolvent-processed PEDOT (Polytetrafluoroethylene)/PSS (Polytetrafluoroethylene) flexible thermoelectric film and preparation method thereof
Technical Field
The invention belongs to the field of preparation of flexible thermoelectric materials, and particularly relates to a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film and a preparation method thereof.
Background
The energy crisis is one of the major challenges facing the 21 st century. The combustion of fossil fuel releases a large amount of energy, only 30-40% is utilized, the remaining 60% of the energy is directly discharged in the air in the form of waste heat, meanwhile, in daily travel of people, only 25% of oil consumption of a common automobile is used for power driving of the automobile, and most of the remaining energy is lost through an automobile body and an exhaust pipe in the form of waste heat. Therefore, it is a convenient and feasible method to improve the current energy use efficiency. The thermoelectric functional material is a green energy material and can directly convert heat and electricity through the migration of carriers in a solid. Up to now, thermoelectric materials are widely used not only in military, aerospace and other high-tech fields, but also in medical thermostats, microsensors and other civil fields. Among them, the flexible thermoelectric material is widely used in the field of wearable electronic devices, and among the flexible thermoelectric materials, the conductive polymer is most frequently used.
Poly-3, 4-ethylenedioxythiophene/polystyrene sulfonic acid (PEDOT: PSS) is a new material with potential in conducting polymers. The PEDOT and PSS can be stably dispersed in water, the aqueous solution of the PEDOT and PSS can be easily prepared on a glass substrate or a flexible substrate, and the formed thermoelectric film has good mechanical property, is green and environment-friendly and has no pollution to the environment. The original film formed by PEDOT and PSS has lower thermoelectric property, the conductivity is lower than 1S/cm, and the Seebeck coefficient is only 15 mu V/K. The conductivity requirement in many fields is high, so that the improvement of the conductivity of PEDOT-PSS films is an important work.
To increase the conductivity of PEDOT: PSS films, various methods are proposed in the literature, such as: secondary doping, acid treatment, mechanical stretching, and the like. The secondary doping method is the most common method, and the dopants are as follows: dimethyl sulfoxide, formamide, ethylene glycol, etc., which are commonly used polar solvents. PSS films were reported to have reduced thermoelectric properties compared to dmso alone, demonstrating no synergistic effect of dmso and ethylene glycol (RSC adv, 2015,5,1910). In addition, N-Dimethylacetamide (DMAC), a common polar solvent, has the characteristics of high thermal stability, low toxicity, low corrosivity and the like, and is used for preparing drugs, synthetic resins and the like. However, when the PEDOT PSS film was treated with DMAC, the conductivity of the film was not significantly improved as compared to the above-mentioned dopants.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the PEDOT/PSS flexible thermoelectric film processed by the water-based cosolvent and the preparation method thereof.
The invention is realized by the following technical scheme:
a preparation method of a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film comprises the following steps:
step 1, uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A;
step 2, soaking the compound A in a mixed solution of an organic polar solvent and deionized water to increase the proportion of dual-polarized PEDOT, and taking out to obtain a compound B;
and 3, removing the organic polar solvent and the deionized water in the compound B, and then removing the substrate to obtain the PEDOT-PSS flexible thermoelectric film.
A preparation method of a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film comprises the following steps:
step 1, uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A;
step 2, soaking the compound A in a mixed solution of an organic polar solvent and deionized water to increase the proportion of dual-polarized PEDOT, and taking out to obtain a compound B;
and 3, removing the organic polar solvent and the deionized water in the compound B to obtain a compound C, dropwise adding 100-300 mu L of mixed liquid of the organic polar solvent and the deionized water to the compound C on a heating table at 120-150 ℃, keeping for 5-15 min, removing the redundant organic polar solvent and the deionized water, and finally removing the substrate to obtain the PEDOT/PSS flexible thermoelectric film.
A preparation method of a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film comprises the following steps:
step 1, uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A;
step 2, soaking the compound A in a mixed solution of an organic polar solvent and deionized water to increase the proportion of dual-polarized PEDOT, taking out, and removing redundant organic polar solvent and deionized water to obtain a compound B;
step 3, dropwise adding 100-300 mu L of mixed liquid of an organic polar solvent and deionized water to the compound B on a heating table at 120-150 ℃, keeping for 5-15 min, and removing redundant organic polar solvent and deionized water to obtain a compound C;
step 4, treating the compound C according to the method for treating the compound A in the step 2, and treating the obtained mixture according to the method for treating the compound B in the step 3;
and 5, circularly processing the PEDOT and PSS for 2-4 times according to the mode in the step 4, and finally removing the substrate to obtain the PEDOT and PSS flexible thermoelectric film.
Preferably, in the step 1, the substrate is washed by deionized water, acetone and isopropanol in sequence, then dried, and then the PEDOT/PSS aqueous solution is uniformly dripped on the obtained substrate.
Preferably, in the step 1, the PEDOT/PSS aqueous solution is dripped on the substrate, and then the substrate is dried for 8-12 hours at the temperature of 50-100 ℃ to obtain the compound A.
Preferably, the organic polar solvent is N, N-dimethylacetamide or dimethyl sulfoxide.
Preferably, the compound A in the step 2 is soaked in a mixed solution of an organic polar solvent and deionized water for 5-20 min, and then taken out to obtain a compound B.
Preferably, in the mixed solution of the organic polar solvent and the deionized water in the step 2, the volume fraction of the organic polar solvent is 20-80%.
Preferably, the compound B in the step 3 is washed with deionized water for 2-3 times, then dried, and then the substrate is removed.
Further, the drying is carried out for 10-20 min at the temperature of 60-80 ℃.
A PEDOT PSS flexible thermoelectric film obtained by the preparation method of the PEDOT PSS flexible thermoelectric film based on the cosolvent treatment.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a preparation method of a PEDOT/PSS flexible thermoelectric film processed by a water-based cosolvent. Compared with a film treated by dimethyl sulfoxide alone, the film treated by the mixed solution of dimethyl sulfoxide and water has improved conductivity; when the N, N-dimethylacetamide and the pure water are used for separately treating the PEDOT/PSS film, the improvement of the conductivity is not effective, but the conductivity can be remarkably improved by mixing the N, N-dimethylacetamide and the pure water, so that the proportion of dual-polarization PEDOT in the PEDOT/PSS film is increased due to the synergistic effect of the N, N-dimethylacetamide and the pure water, and electrons on a PEDOT conjugated chain are more delocalized. And then removing the redundant organic polar solvent and deionized water on the surface of the film, removing the substrate, and obtaining the PEDOT/PSS flexible thermoelectric film with higher conductivity and power factor by optimizing the volume ratio of N, N-dimethylacetamide to pure water.
Drawings
FIG. 1 is a graph showing the bending of a PEDOT PSS flexible thermoelectric film obtained in example 6 of the present invention.
FIG. 2 is a graph showing the relationship among the electrical conductivity, Seebeck coefficient, power factor and volume fraction of DMAC of the PEDOT/PSS flexible thermoelectric thin films obtained in examples 1 to 4 of the present invention.
FIG. 3 is a graph showing the relationship between the conductivity and Seebeck coefficient of the PEDOT/PSS flexible thermoelectric thin films obtained in examples 7 to 11 of the present invention and the cycle number of DMAC.
FIG. 4 is a Raman spectrum of the PEDOT/PSS flexible thermoelectric film obtained in example 4 of the present invention.
Detailed Description
The invention will be described in detail with reference to the drawings, which are provided for the purpose of illustration and not for the purpose of limitation.
The invention relates to a preparation method of a PEDOT/PSS flexible thermoelectric film treated by a water-based cosolvent, which comprises the following steps:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 100-300 mu L of PEDOT (PSS) aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 8-12 hours at 50-100 ℃ to obtain a film A;
the PEDOT and PSS aqueous solution is a commercial product with the specification of Clevious PH1000, and the specific information is as follows:
Figure BDA0003408440940000051
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of an organic polar solvent and pure water for 5-20 min to increase the proportion of the dual-polarized PEDOT, wherein the organic polar solvent is one of N, N-dimethylacetamide and dimethyl sulfoxide, the volume fraction of the N, N-dimethylacetamide is 20-80%, the volume fraction of the dimethyl sulfoxide is 80%, then taking out, washing with deionized water for 2-3 times, drying at 60-80 ℃ for 10-20 min, and forming the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: to further remove the insulation PSS, increasing the electrical conductivity of the flexible thermoelectric film, the following steps are performed:
and (3) dropwise adding 100-300 mu L of the mixed solvent obtained in the third step on a heating table at 120-150 ℃, keeping for 5-15 min, washing for 2-3 times by using deionized water, drying for 10-20 min at 60-80 ℃, and removing the glass substrate to obtain the PEDOT PSS flexible thermoelectric film B. (the dropping step is called drop);
step five: repeating the third step and the fourth step for 2-4 times.
Example 1:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 20%, taking out the film A, washing the film A with deionized water for 3 times, drying the film A at 80 ℃ for 10min, and removing the glass substrate to obtain the PEDOT/PSS flexible thermoelectric film B. (the soaking step is called dip)
Example 2:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 40%, taking out the film A, washing the film A with deionized water for 3 times, drying the film A at 80 ℃ for 10min, and removing the glass substrate to obtain the PEDOT/PSS flexible thermoelectric film B. (the soaking step is called dip)
Example 3:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to change the structure of a PEDOT molecule, wherein the volume fraction of the N, N-dimethylacetamide is 60%, taking out the film A, washing the film A with deionized water for 3 times, drying the film A at 80 ℃ for 10min, and removing the glass substrate to obtain the PEDOT/PSS flexible thermoelectric film B. (the soaking step is called dip)
Example 4:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 80%, taking out the film A, washing the film A with deionized water for 3 times, drying the film A at 80 ℃ for 10min, and removing the glass substrate to obtain the PEDOT/PSS flexible thermoelectric film B. (the soaking step is called dip)
Example 5:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step (II) in a mixed solvent of dimethyl sulfoxide and pure water for 10min to increase the proportion of dual-polarization PEDOT, wherein the volume fraction of the dimethyl sulfoxide is 80%, then taking out the film A, washing the film A with deionized water for 3 times, drying the film A at 80 ℃ for 10min, and then removing the glass substrate to obtain the PEDOT/PSS flexible thermoelectric film B. (the soaking step is called dip)
Example 6:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 8 hours at 50 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 5min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 20%, then taking out the film A, washing the film A with deionized water for 3 times, and drying the film A at 60 ℃ for 20min to form the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: and (3) dropwise adding 100 mu L of the mixed solvent obtained in the third step on a heating table at 140 ℃, keeping for 15min, washing for 2 times by using deionized water, drying for 10min at 80 ℃, and then removing the glass substrate to obtain the PEDOT-PSS flexible thermoelectric film C. (the dropping step is called-drop)
Example 7: the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 80%, then taking out the film A, washing the film A with deionized water for 3 times, and drying the film A at 80 ℃ for 10min to form the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: and (3) dropwise adding 200 mu L of the mixed solvent obtained in the third step on a heating table at 140 ℃, keeping for 10min, washing for 2 times by using deionized water, drying for 10min at 80 ℃, and then removing the glass substrate to obtain the PEDOT-PSS flexible thermoelectric film C. (the dropping step is called-drop)
Example 8:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 80%, then taking out the film A, washing the film A with deionized water for 3 times, and drying the film A at 80 ℃ for 10min to form the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: dropping 200 μ L of the mixed solvent obtained in the third step into the film obtained in the third step at 140 deg.C, maintaining for 10min, washing with deionized water for 2 times, drying at 80 deg.C for 10min, (the dropping step is called-drop)
Step five: and repeating the third step and the fourth step for 1 time, and then removing the glass substrate to obtain the PEDOT-PSS flexible thermoelectric film.
Example 9:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 80%, then taking out the film A, washing the film A with deionized water for 3 times, and drying the film A at 80 ℃ for 10min to form the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: dropping 200 μ L of the mixed solvent obtained in the third step into the film obtained in the third step at 140 deg.C, maintaining for 10min, washing with deionized water for 2 times, drying at 80 deg.C for 10min, (the dropping step is called-drop)
Step five: and repeating the third step, the fourth step and 2 times, and then removing the glass substrate to obtain the PEDOT-PSS flexible thermoelectric film.
Example 10:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 80%, then taking out the film A, washing the film A with deionized water for 3 times, and drying the film A at 80 ℃ for 10min to form the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: dropping 200 μ L of the mixed solvent obtained in the third step into the film obtained in the third step at 140 deg.C, maintaining for 10min, washing with deionized water for 2 times, drying at 80 deg.C for 10min, (the dropping step is called-drop)
Step five: and repeating the third step and the fourth step for 3 times, and then removing the glass substrate to obtain the PEDOT-PSS flexible thermoelectric film.
Example 11:
the method comprises the following steps: cleaning a glass substrate with deionized water, acetone and isopropanol in sequence, and then drying;
step two: dripping 200 mu L of PEDOT, namely PSS aqueous solution (Clevious PH1000) onto the glass substrate obtained in the step one, placing the glass substrate into a vacuum drying oven, and drying the glass substrate for 12 hours at the temperature of 60 ℃ to obtain a film A;
step three: and (3) soaking the film A obtained in the step two in a mixed solvent of N, N-dimethylacetamide and pure water for 10min to increase the proportion of the dual-polarized PEDOT, wherein the volume fraction of the N, N-dimethylacetamide is 80%, then taking out the film A, washing the film A with deionized water for 3 times, and drying the film A at 80 ℃ for 10min to form the PEDOT/PSS flexible thermoelectric film B on the glass substrate. (the soaking step is called dip)
Step four: dropping 200 μ L PEDOT PSS on the film obtained in step three at 140 deg.C, maintaining for 10min, washing with deionized water for 2 times, drying at 80 deg.C for 10min (the dropping step is called-drop)
Step five: and repeating the third step, the fourth step and the fourth step for 4 times, and then removing the glass substrate to obtain the PEDOT/PSS flexible thermoelectric film.
Table 1 shows the conductivity, Seebeck coefficient and power factor of the PEDOT/PSS flexible thermoelectric film obtained in example 5 of the present invention. As shown in Table 1, 80% DMSO and 20% H2The conductivity of the film treated by the O mixed solution is 1462.116S/cm, and compared with that of the pure DMSO-treated PEDOT, the conductivity of the PPSS film is 853.394S/cm, which is improved by 1.7 times.
TABLE 1 conductivity, Seebeck coefficient, Power factor of the PEDOT/PSS flexible thermoelectric films obtained in example 5
Figure BDA0003408440940000101
Figure BDA0003408440940000111
As shown in figure 1, the sheet clamped by the middle tweezers is the PEDOT/PSS flexible thermoelectric film, can be independently formed and bent, and shows excellent flexibility.
As shown in fig. 2, the electrical conductivity of the film treated with the mixed solvent of N, N-dimethylacetamide and pure water was continuously increased with the increase in volume fraction of N, N-dimethylacetamide, the seebeck coefficient was not greatly changed, and the power factor was continuously increased. When the volume fraction of DMAC is 80%, the conductivity and power factor of the film reach peak values of 964.0072S/cm and 33.8682 mu W/m/K respectively2Wherein the conductivity is improved by 9 times compared with the conductivity of 104.2675S/cm of the film only treated by N, N-dimethylacetamideThe conductivity of the pure water treated film is 28 times of 37.0498S/cm, and is 10 times of that of the untreated PEDOT/PSS film (less than 1S/cm)3And (4) doubling.
As shown in FIG. 3, the conductivity of the PEDOT/PSS film was changed by the change of the number of cycles of the mixed solvent of N, N-dimethylacetamide and pure water (1 dip-drop for 1 cycle), and the conductivity reached a maximum of 1494.9471S/cm, which was 1.4 times that of the film treated with only dip, and the maximum power factor reached 41.3547. mu.W/m/K for 2 cycles of the treatment2. After 2 cycles of treatment, the conductivity dropped continuously due to multiple rinses of deionized water.
As shown in FIG. 4, FIG. 4 is a Raman spectrum of the PEDOT PSS flexible thermoelectric film prepared in example 4. At 1430 and 1560cm-1The peak at (A) is due to the C of PEDOT in the polaron and bipolarin states, respectivelyα＝CβSymmetric stretching and Cα＝CβAsymmetric stretching. The cosolvent treated N, N-dimethylacetamide and purified water film was present at 1560cm, compared to PEDOT: PSS film-1Shows a more intense and broader peak indicating that the proportion of PEDOT bipolariser states increases and that electrons on the conjugate chain of PEDOT are more readily delocalised.

Claims (10)

1. A preparation method of a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film is characterized by comprising the following steps:
step 1, uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A;
step 2, soaking the compound A in a mixed solution of an organic polar solvent and deionized water to increase the proportion of dual-polarized PEDOT, and taking out to obtain a compound B;
and 3, removing the organic polar solvent and the deionized water in the compound B, and then removing the substrate to obtain the PEDOT-PSS flexible thermoelectric film.
2. A preparation method of a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film is characterized by comprising the following steps:
step 1, uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A;
step 2, soaking the compound A in a mixed solution of an organic polar solvent and deionized water to increase the proportion of dual-polarized PEDOT, and taking out to obtain a compound B;
and 3, removing the organic polar solvent and the deionized water in the compound B to obtain a compound C, dropwise adding 100-300 mu L of mixed liquid of the organic solvent and the deionized water to the compound C on a heating table at 120-150 ℃, keeping for 5-15 min, removing the redundant organic polar solvent and the deionized water, and finally removing the substrate to obtain the PEDOT/PSS flexible thermoelectric film.
3. A preparation method of a water-based cosolvent-processed PEDOT/PSS flexible thermoelectric film is characterized by comprising the following steps:
step 1, uniformly dripping a PEDOT (PSS) aqueous solution on a substrate, and then drying to form a PEDOT (PSS) layer on the substrate to obtain a compound A;
step 2, soaking the compound A in a mixed solution of an organic polar solvent and deionized water to increase the proportion of dual-polarized PEDOT, taking out, and removing the organic polar solvent and the deionized water to obtain a compound B;
step 3, dropwise adding 100-300 mu L of mixed liquid of an organic polar solvent and deionized water to the compound B on a heating table at 120-150 ℃, keeping for 5-15 min, and removing redundant organic solvent and deionized water to obtain a compound C;
step 4, treating the compound C according to the method for treating the compound A in the step 2, and treating the obtained mixture according to the method for treating the compound B in the step 3;
and 5, circularly processing the PEDOT and PSS for 2-4 times according to the mode in the step 4, and finally removing the substrate to obtain the PEDOT and PSS flexible thermoelectric film.
4. The preparation method of the PEDOT PSS flexible thermoelectric film processed by the water-based cosolvent according to the claim 1, characterized in that the substrate is washed by deionized water, acetone and isopropanol in sequence in the step 1, and then dried, and then the PEDOT PSS aqueous solution is uniformly dripped on the obtained substrate.
5. The preparation method of the PEDOT PSS flexible thermoelectric film processed by the water-based cosolvent according to the claim 1, characterized in that the compound A is obtained by dripping water solution of PEDOT PSS on a substrate and then drying the solution at 50-100 ℃ for 8-12 h in the step 1.
6. The preparation method of the PEDOT/PSS flexible thermoelectric film processed by the water-based cosolvent according to claim 1, wherein the compound A in the step 2 is soaked in a mixed solution of an organic polar solvent and deionized water for 5-20 min and then taken out to obtain a compound B.
7. The method for preparing the PEDOT/PSS flexible thermoelectric film processed by the water-based cosolvent according to claim 1, wherein the volume fraction of the organic solvent in the mixed solution of the organic polar solvent and the deionized water in the step 2 is 20-80%.
8. The preparation method of the PEDOT/PSS flexible thermoelectric film processed by the water-based cosolvent according to claim 1, wherein the compound B in the step 3 is washed with deionized water for 2-3 times, then dried, and then the substrate is removed.
9. The preparation method of the PEDOT/PSS flexible thermoelectric film processed by the water-based cosolvent according to claim 8, wherein the drying is carried out at 60-80 ℃ for 10-20 min.
10. A PEDOT/PSS flexible thermoelectric film obtained by the preparation method of the PEDOT/PSS flexible thermoelectric film treated by the water-based cosolvent according to any one of claims 1-9.
CN202111520373.8A 2021-12-13 2021-12-13 Water-based cosolvent-processed PEDOT (Polytetrafluoroethylene)/PSS (Polytetrafluoroethylene) flexible thermoelectric film and preparation method thereof Withdrawn CN114220906A (en)

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Publication number Priority date Publication date Assignee Title
CN114813881A (en) * 2022-05-09 2022-07-29 西安交通大学 Biosensor based on organic electrochemical transistor and detection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114813881A (en) * 2022-05-09 2022-07-29 西安交通大学 Biosensor based on organic electrochemical transistor and detection method

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