A deuterated pedot conjugated polymer, and a preparation method and application thereof

Abstract

The application provides a kind of deuterated PEDOT conjugated polymer and its preparation method and application, belong to photoelectric technology field.The deuterated PEDOT conjugated polymer described in the application can improve photoelectric performance, improve the conductivity of material;And the C-D bond contained in deuterated PEDOT is stronger than C-H bond, so that the interaction between π-π molecules is stronger, and then the physical properties of electrode material are influenced, the cycle stability is improved, and the life of device is prolonged.The electrochromic-supercapacitor based on the deuterated PEDOT conjugated polymer has good cycle life, which provides certain theoretical guidance and technical support for the research of electrochromic-supercapacitor material and device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optoelectronic technology, in particular to a deuterated PEDOT conjugated polymer and a preparation method and application thereof. BACKGROUND

[0002] With the rise of artificial intelligence electronic products, multifunctional supercapacitors integrating new features have gradually become a research hotspot. It is crucial to strengthen the research and development of high-performance supercapacitor systems and improve their stability and reliability. Compared with traditional inorganic materials, conductive polymer (CP) electrode materials have the advantages of easy performance control, high theoretical specific capacitance, light weight and low cost, and can change the structure to realize the conversion of energy band and color, and are easy to process into large-area flexible devices, etc., and are one of the most promising electrode materials.

[0003] Among CPs, poly(3,4-dioxyethylene thiophene) (PEDOT) has become a star molecule in conductive polymers due to its unique structure, excellent physical and chemical properties, and special position in organic electronics, similar to the importance of silicon in the semiconductor industry. However, due to the continuous entry and extraction of doping ions, the volume of PEDOT thin film expands and shrinks during the redox process, causing the polymer chain to break, which greatly reduces the cycle stability of the PEDOT thin film, and seriously damages the service life of supercapacitor devices based on such materials. In order to solve the above problems, researchers usually introduce side chain groups, copolymerize or composite with other materials on the PEDOT conjugated main chain, and use the properties of other components to synergize the intrinsic properties of conductive polymers. However, this method can improve the cycle stability while weakening the electrochromic or capacitive performance of the material. SUMMARY

[0004] The present application aims to provide a deuterated PEDOT conjugated polymer and a preparation method and application thereof, which has super-stable performance and excellent electrochromic or capacitive performance, and can solve the problem of low service life of electrochromic-supercapacitor devices.

[0005] In order to achieve the above application purposes, the present application provides the following technical solutions:

[0006] The present application provides a deuterated PEDOT conjugated polymer having the structure shown in Formula 1:

[0007]

[0008] In Formula 1, n = 2-100 and n is an integer.

[0009] The present application provides a preparation method of the deuterated PEDOT conjugated polymer described in the above technical solutions, comprising the following steps:

[0010] In a three-electrode system, the deuterated EDOT precursor is subjected to constant potential polymerization in an electrolyte to obtain a deuterated PEDOT conjugated polymer;

[0011] The deuterated EDOT precursor has a structure shown in formula 2:

[0012]

[0013] Preferably, the preparation method of the deuterated EDOT precursor comprises: mixing 3,4-dimethoxythiophene, p-toluenesulfonic acid, ethylene glycol-D6 and an organic solvent to perform etherification reaction to obtain the deuterated EDOT precursor.

[0014] Preferably, the molar ratio of the 3,4-dimethoxythiophene to the p-toluenesulfonic acid is 5-8:0.5-1.

[0015] Preferably, the molar ratio of the 3,4-dimethoxythiophene to the ethylene glycol-D6 is 5-8:18-22.

[0016] Preferably, the etherification reaction is performed under a nitrogen atmosphere; the temperature of the etherification reaction is 70-110°C, and the time is 48-72h.

[0017] Preferably, the voltage of the constant potential polymerization is 1.0-1.2V, and the time is 50-80s; the electrolyte is boron trifluoride etherate; and the dosage ratio of the electrolyte to the deuterated EDOT precursor is 5-15mL:0.010-0.020g.

[0018] The application provides an application of the deuterated PEDOT conjugated polymer in an electrochromic-supercapacitor.

[0019] Preferably, the preparation method of the electrochromic-supercapacitor comprises the following steps:

[0020] A deuterated PEDOT polymer thin film is prepared by electro-polymerizing the deuterated EDOT precursor on an ITO-PET substrate as a working electrode; the deuterated EDOT precursor is the deuterated EDOT precursor in the above technical solution;

[0021] A PEDOT polymer thin film is prepared by electro-polymerizing EDOT on an ITO-PET substrate as a counter electrode;

[0022] A gel electrolyte is coated on the working electrode and the counter electrode respectively, and the working electrode and the counter electrode are bonded to obtain an electrochromic-supercapacitor.

[0023] Preferably, when preparing PEDOT polymer film by electropolymerization of EDOT, the constant voltage of the polymerization reaction is 0.8-1.1V, the time is 20-50s, and the ratio of boron trifluoride ether to EDOT is 5-15mL:0.010-0.020g.

[0024] This invention provides a deuterated PEDOT conjugated polymer. By introducing the deuterium (D) element into the conjugated polymer, the isotopic effect generated by the large difference in zero-point energies between hydrogen and deuterium alters the material's physical properties such as polarity, polarizability, and molecular volume. This, in turn, affects the interactions between non-covalent bonds (e.g., hydrogen bonds, CH-π, and π-π). The π-π interactions result in different stacking patterns of the conductive polymer chains, thus affecting the overall electronic structure of the material and improving its photoelectric properties and conductivity. Furthermore, the CD bonds in deuterated PEDOT are stronger than CH bonds, enhancing the π-π molecular interactions and thus influencing the physical properties of the electrode material, improving cycle stability, and extending device lifespan. The electrochromic supercapacitor based on this deuterated PEDOT conjugated polymer exhibits excellent cycle life.

[0025] This invention involves deuteration substitution of 3,4-dioxanethiophene (EDOT) as a precursor, followed by one-step constant-voltage electropolymerization of the deuterated EDOT to obtain a deuterated PEDOT conjugated polymer. The preparation method is simple and controllable. This invention utilizes deuteration substitution combined with the unique structural characteristics of conductive polymers, and is expected to provide new ideas for the synthesis of various conductive polymers and the intrinsic property regulation. At the same time, it provides certain theoretical guidance, material and technical support for the research of ultrastable (cycle-stable) electrochromic supercapacitor materials and their long-life devices. Attached Figure Description

[0026] Figure 1 This is a synthetic route diagram for the deuterated EDOT precursor of the present invention;

[0027] Figure 2 The concentration is 0.01 mol L. -1 LSV plot of deuterated EDOT in boron trifluoride diethyl ether system (scan rate 100 mV s) -1 );

[0028] Figure 3 The redox stability test chromatogram of the deuterated PEDOT conjugated polymer in boron trifluoride diethyl ether in Example 2 (scan rate 100 mV s) is shown. -1 );

[0029] Figure 4 The deuterated PEDOT conjugated polymer in Example 2 was prepared in monomer-free acetonitrile-lithium perchlorate (0.1 mol L) -1UV-Vis spectrum in Example 2;

[0030] Figure 5 Time-transmittance curve of the deuterated PEDOT conjugated polymer in Example 2 at a wavelength of 507 nm using a double-step chronoamperometry method at a switching time of 10 s;

[0031] Figure 6 Charge-discharge curve of the deuterated PEDOT conjugated polymer in Example 2 at different current densities;

[0032] Figure 7 Preparation flowchart of the electrochromic-supercapacitor based on the deuterated PEDOT conjugated polymer thin film in Example 4;

[0033] Figure 8 Structure schematic diagram of the electrochromic-supercapacitor based on the deuterated PEDOT conjugated polymer thin film in Example 4;

[0034] Figure 9 UV-Vis spectrum of the electrochromic-supercapacitor based on the deuterated PEDOT conjugated polymer thin film in Example 4;

[0035] Figure 10 Galvanostatic charge-discharge curve of the electrochromic-supercapacitor based on the deuterated PEDOT conjugated polymer thin film in Example 4 at different current densities;

[0036] Figure 11 Specific capacitance cycle stability diagram of the electrochromic-supercapacitor based on the deuterated PEDOT conjugated polymer thin film in Example 4. DETAILED DESCRIPTION

[0037] The present application provides a deuterated PEDOT conjugated polymer, having a structure shown in Formula 1:

[0038]

[0039] In Formula 1, n = 2-100 and n is an integer.

[0040] The present application provides a preparation method of the deuterated PEDOT conjugated polymer described in the above technical solution, comprising the following steps:

[0041] In a three-electrode system, the deuterated EDOT precursor is subjected to constant potential polymerization in an electrolyte to obtain the deuterated PEDOT conjugated polymer;

[0042] The deuterated EDOT precursor has a structure shown in Formula 2:

[0043]

[0044] In the present application, the required materials or reagents are all commercially available unless otherwise specified.

[0045] In the present application, ITO glass is preferably used as the working electrode, platinum wire as the counter electrode, and Ag / AgCl as the reference electrode in the three-electrode system; the reference electrode is preferably prepared by constant voltage film forming method, and more preferably by immersing the polished Ag electrode in a 6 mol / L hydrochloric acid solution under a voltage of 1.5 V for electrochemical deposition for 100 s to obtain the Ag / AgCl reference electrode. -1

[0046] In the present application, the preparation method of the deuterated EDOT precursor preferably comprises mixing 3,4-dimethoxythiophene (EDOT), p-toluenesulfonic acid, ethylene glycol-D6 and an organic solvent to perform etherification reaction to obtain the deuterated EDOT precursor.

[0047] In the present application, the molar ratio of 3,4-dimethoxythiophene to p-toluenesulfonic acid is preferably 5-8:0.5-1, and more preferably 6.94:0.69; and the molar ratio of 3,4-dimethoxythiophene to ethylene glycol-D6 is preferably 5-8:18-22, and more preferably 6.94:20.81.

[0048] In the present application, the organic solvent is preferably toluene; and the amount ratio of 3,4-dimethoxythiophene to toluene is preferably 5-8 mmol:10-30 mL, and more preferably 6.94 mmol:20 mL.

[0049] In the present application, 3,4-dimethoxythiophene, p-toluenesulfonic acid, ethylene glycol-D6 and an organic solvent are mixed, and the obtained reaction mixture is replaced with N2 for 3 times before reaction.

[0050] In the present application, the etherification reaction is preferably performed under nitrogen atmosphere; the temperature of the etherification reaction is preferably 70-110℃, and more preferably 80-90℃; and the time is preferably 48-72 h, and more preferably 72 h.

[0051] After the reaction is completed, the obtained mixture is cooled to room temperature, the organic phase is collected and dried with anhydrous MgSO4, filtered, vacuum concentrated, the obtained crude product is purified by silica gel column chromatography with petroleum ether as the eluent to obtain the deuterated EDOT precursor.

[0052] ​In the present application, the electrolyte is preferably boron trifluoride etherate, which is preferably commercially available boron trifluoride etherate; the ratio of the use amount of the electrolyte to the deuterated EDOT precursor is preferably 5-15 mL:0.010-0.020 g, more preferably 10-15 mL:0.014-0.018 g; the voltage of the constant potential polymerization is preferably 1.0-1.2 V, more preferably 1.0-1.1 V; and the time is preferably 50-80 s, more preferably 60-70 s.

[0053] After the constant potential polymerization is completed, the product obtained is preferably rinsed with acetonitrile to remove oligomers and residual boron trifluoride etherate.

[0054] In the present application, taking toluene as an example of the organic solvent, the preparation reaction formula of the deuterated PEDOT (poly(3,4-dioxyethylenethiophene)) conjugated polymer is as follows:

[0055]

[0056] The present application provides the application of the deuterated PEDOT conjugated polymer in the electrochromic-supercapacitor.

[0057] In the present application, the preparation method of the electrochromic-supercapacitor preferably comprises the following steps:

[0058] The deuterated PEDOT polymer thin film is prepared by electro-polymerizing the deuterated EDOT precursor on the ITO-PET substrate as the working electrode; the deuterated EDOT precursor is the deuterated EDOT precursor according to the above technical solution.

[0059] The PEDOT polymer thin film is prepared by electro-polymerizing EDOT on the ITO-PET substrate as the counter electrode.

[0060] The gel electrolyte is coated on the working electrode and the counter electrode respectively, and the working electrode and the counter electrode are bonded to obtain the electrochromic-supercapacitor.

[0061] The present application does not have special limitations on the source of the ITO-PET substrate, and commercially available products known in the art can be used.

[0062] In the present application, the method for preparing a deuterated PEDOT polymer thin film by electro-polymerizing a deuterated EDOT precursor on an ITO-PET substrate is preferably as follows: taking an ITO-PET substrate as a working electrode, a platinum wire as a counter electrode, and Ag / AgCl as a reference electrode, and performing constant potential polymerization of the deuterated EDOT precursor in boron trifluoride ether; the ratio of the amount of boron trifluoride ether to the amount of deuterated EDOT is preferably 5-15 mL:0.010-0.020 g, and more preferably 10 mL:0.014 g; the voltage of the constant potential polymerization is preferably 1.0-1.2 V, and more preferably 1.1 V; and the time is preferably 50-80 s, and more preferably 60 s.

[0063] In the present application, the method for preparing a PEDOT polymer thin film by electro-polymerizing EDOT on an ITO-PET substrate is preferably as follows: taking an ITO-PET substrate as a working electrode, a platinum wire as a counter electrode, and Ag / AgCl as a reference electrode, and performing polymerization of EDOT in boron trifluoride ether; the ratio of the amount of boron trifluoride ether to the amount of EDOT is preferably 5-15 mL:0.010-0.020 g, and more preferably 10 mL:0.014 g; the constant voltage of the polymerization is preferably 0.8-1.1 V, and more preferably 1.0 V; and the time is preferably 20-50 s, and more preferably 30 s.

[0064] In the present application, the size of the ITO-PET substrate is preferably 2.5 cm x 3 cm (rectangular), and a 3M double-sided tape with a width of 0.3 cm is preferably used to enclose a rectangular area with a size of 1.9 cm x 1.4 cm on the conductive surface of the ITO-PET substrate for the electro-polymerization reaction.

[0065] In the present application, the preparation method of the gel electrolyte (as an ion conduction layer) preferably comprises the following steps: mixing lithium perchlorate, acetonitrile, polymethyl methacrylate, and propylene carbonate, and heating at 70 ℃ for 6 h under nitrogen protection to obtain the gel electrolyte; the mass ratio of lithium perchlorate, acetonitrile, polymethyl methacrylate, and propylene carbonate is preferably 3.5:5.5:5.5:85.5.

[0066] The technical solutions provided by the present application are described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.

[0067] Example 1

[0068] The synthesis route of the precursor of the deuterated PEDOT conjugated polymer provided in this example is as shown in Figure 1As shown, specifically comprising the following steps: 6.94 mmol 3,4-dimethoxythiophene, 0.69 mmol p-toluenesulfonic acid and 20.81 mmol ethylene glycol-D6 were added into a two-necked flask, 20 mL of toluene was added, the resulting reaction mixture was replaced with N2 for 3 times, the system was heated to 90°C and stirred for 72 h, the reaction was monitored by thin layer chromatography, the resulting mixture was cooled to room temperature, the organic phase was collected and dried with anhydrous MgSO4, filtered, vacuum concentrated, the resulting crude product was purified by silica gel column chromatography with petroleum ether as eluent to obtain a colorless liquid, which was deuterated EDOT precursor 1 H NMR (400 MHz, CDCl3) δ 6.24 (d, J = 1.9 Hz, 1H)), the structural formula is:

[0069]

[0070] Example 2

[0071] A three-electrode system was used, ITO glass was used as the working electrode, platinum wire was used as the counter electrode, Ag / AgCl was used as the reference electrode, and commercially available boron trifluoride ether was used as the electrolyte. 0.014 g of deuterated EDOT precursor (deuterated EDOT precursor prepared in Example 1) was polymerized in 10 mL of electrolyte at a potential of 1.1 V, and the polymerization time was 60 s to obtain a deuterated PEDOT conjugated polymer, the structural formula is:

[0072]

[0073] n = 2-100 and n is an integer.

[0074] Example 3

[0075] A three-electrode system was used, ITO glass was used as the working electrode, platinum wire was used as the counter electrode, Ag / AgCl was used as the reference electrode, and commercially available boron trifluoride ether was used as the electrolyte. 0.018 g of deuterated EDOT precursor (deuterated EDOT precursor prepared in Example 1) was polymerized in 15 mL of electrolyte at a potential of 1.0 V, and the polymerization time was 70 s to obtain a deuterated PEDOT conjugated polymer.

[0076] Characterization and testing

[0077] 1) Figure 2 The concentration of deuterated EDOT in boron trifluoride ether system is 0.01 mol / L -1 , the LSV graph (the scan rate is 100 mV / s -1 ) is shown in Figure 1. As can be seen from Figure 2 , in the boron trifluoride ether system, the initial oxidation potential of the deuterated EDOT precursor is 0.83 V, so a polymerization potential of 1.1 V is used.

[0078] 2) Figure 3 The redox stability test graph (scan rate is 100 mV s -1 ) of the deuterated PEDOT conjugated polymer in Example 2 tested in a three-electrode system (counter electrode is platinum wire, reference electrode is Ag / AgCl, working electrode is deuterated PEDOT conjugated polymer) in boron trifluoride ether; Figure 3 It can be seen that the electroactivity retains 96% of the original value after 300,000 doping-dedoping cycles, showing excellent electrochemical stability.

[0079] 3) Figure 4 The ultraviolet-visible spectrum graph of the deuterated PEDOT conjugated polymer in Example 2 in acetonitrile-lithium perchlorate solution (lithium perchlorate concentration is 0.1 mol L -1 ) without deuterated EDOT monomer; it can be seen from Figure 4 that the maximum absorption peak is at 440 nm at a voltage of -1.0 V. When the applied voltage increases to 1.5 V, the maximum absorption peak at 440 nm weakens and eventually disappears, and a new absorption peak appears at 620 nm.

[0080] 4) The time-transmittance curve of the deuterated PEDOT conjugated polymer in Example 2 was tested by double-step chronamperometry at a wavelength of 507 nm with a switching time of 10 s, and the results are shown in Figure 5 ; it can be seen from Figure 5 that the transmittance of the deuterated PEDOT conjugated polymer at 507 nm is 41%, indicating that the electrochromic performance of the deuterated PEDOT conjugated polymer is excellent.

[0081] 5) The charge-discharge curve of the deuterated PEDOT conjugated polymer in Example 2 was tested at a current density of 1 Ag -1 , 2 Ag -1 , 5 Ag -1 , 8 Ag -1 , and 10 Ag -1 , and the results are shown in Figure 6 ; it can be seen from Figure 6 that when the current density is 1 Ag -1 , the specific capacitance is 310 F g -1 . When the current density increases to 10 Ag -1 , the specific capacitance of the conjugated polymer can still be maintained at 248 F g -1 , showing excellent rate performance.

[0082] Example 4

[0083] As shown in Figure 7 , an electrochromic-supercapacitor device was prepared:

[0084] The size of the ITO-PET substrate used was 2.5 cm x 3 cm (oblong), and a 3M double-sided tape with a width of 0.3 cm was used to enclose a rectangle with a size of 1.9 cm x 1.4 cm on the conductive side of the ITO-PET substrate for the electropolymerization reaction;

[0085] The ITO-PET substrate was used as the working electrode, a platinum wire was used as the counter electrode, and Ag / AgCl was used as the reference electrode. 0.014 g of deuterated EDOT precursor (deuterated EDOT precursor prepared in Example 1) was subjected to constant potential polymerization in 10 mL of boron trifluoride ether, the polymerization voltage was 1.1 V, and the time was 60 s, to form a deuterated PEDOT polymer thin film. The obtained electrode was used as the working electrode.

[0086] The ITO-PET substrate was used as the working electrode, a platinum wire was used as the counter electrode, and Ag / AgCl was used as the reference electrode. 0.014 g of deuterated EDOT precursor (deuterated EDOT precursor prepared in Example 1) was subjected to constant potential polymerization in 10 mL of boron trifluoride ether, the polymerization voltage was 1.1 V, and the time was 60 s, to form a deuterated PEDOT polymer thin film. The obtained electrode was used as the working electrode.

[0087] Lithium perchlorate, acetonitrile, polymethyl methacrylate, and propylene carbonate were mixed, and heated at 70°C for 6 h under nitrogen protection to obtain a gel electrolyte; the mass ratio of lithium perchlorate, acetonitrile, polymethyl methacrylate, and propylene carbonate was 3.5:5.5:5.5:85.5;

[0088] The obtained working electrode and counter electrode were coated with the gel electrolyte, and the obtained working electrode and counter electrode were bonded to obtain a deuterated PEDOT-based electrochromic-supercapacitor, and a structural schematic diagram is shown in Figure 8 .

[0089] Comparative Example 1

[0090] According to the method of Example 4, a PEDOT-based electrochromic-supercapacitor with a symmetrical structure, ITO-PET / PEDOT / gel electrolyte / PEDOT / ITO-PET, was prepared using a PEDOT electrode.

[0091] Figure 9 The UV-visible spectrum of the deuterated PEDOT-based electrochromic-supercapacitor device in Example 4 was from 0 V to 1 V, and the maximum absorption peak was at 560 nm.

[0092] The deuterated PEDOT-based electrochromic-supercapacitor device in Example 4 was tested for 1 Ag -1 , 2 Ag -1 , 5 Ag -1 , 8 Ag -1 , and 10 Ag -1The constant current charge-discharge curves of the electrochromic supercapacitor based on deuterated PEDOT conjugated polymer film in Example 4 were obtained from the current density test. The results are as follows: Figure 10 As shown, by Figure 10 It can be seen that at a current density of 1Ag -1 At that time, its specific capacitance was 42F g -1 When the current density increases to 10Ag -1 At that time, the specific capacitance can still be maintained at 36F g. -1 In contrast, the PEDOT-based electrochromic supercapacitor in Comparative Example 1 operates at a current density of 1 Ag. -1 At that time, its specific capacitance was 29F g. -1 .

[0093] Figure 11 This is a graph showing the specific capacitance cycling stability of the electrochromic supercapacitor based on deuterated PEDOT conjugated polymer film in Example 4; (The graph is derived from...) Figure 11 It can be seen that at a current density of 20Ag -1 At that time, the specific capacitance retention rate of the device was 90% after 10,000 cycles; while in Comparative Example 1, the specific capacitance retention rate of the PEDOT-based electrochromic supercapacitor was only 80% after 3,000 cycles.

[0094] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. Use of a deuterated PEDOT conjugated polymer in electrochromic-supercapacitors, characterized in that, The deuterated PEDOT conjugated polymer has a structure shown in formula 1. Formula 1; In formula 1, n = 2-100 and n is an integer. The preparation method of the electrochromic-supercapacitor comprises the following steps: A deuterated PEDOT polymer thin film is prepared by electro-polymerizing a deuterated EDOT precursor on an ITO-PET substrate as a working electrode; The deuterated EDOT precursor has a structure shown in formula 2: Formula 2; A PEDOT polymer thin film is prepared by electro-polymerizing EDOT on an ITO-PET substrate as a counter electrode; A gel electrolyte is coated on the working electrode and the counter electrode respectively, and the working electrode and the counter electrode are bonded to obtain an electrochromic-supercapacitor.

2. Use according to claim 1, characterized in that, The preparation method of the deuterated PEDOT conjugated polymer comprises the following steps: In a three-electrode system, the deuterated EDOT precursor is subjected to constant potential polymerization in an electrolyte to obtain a deuterated PEDOT conjugated polymer.

3. Use according to claim 2, characterized in that, The preparation method of the deuterated EDOT precursor comprises: mixing 3,4-dimethoxythiophene, p-toluenesulfonic acid, ethylene glycol-D6 and an organic solvent, and performing etherification reaction to obtain the deuterated EDOT precursor.

4. Use according to claim 3, characterized in that, The molar ratio of the 3,4-dimethoxythiophene to the p-toluenesulfonic acid is 5-8:0.5-1.

5. Use according to claim 3 or 4, characterized in that, The molar ratio of the 3,4-dimethoxythiophene to the ethylene glycol-D6 is 5-8:18-22.

6. Use according to claim 3, characterized in that, The etherification reaction is performed under a nitrogen atmosphere, and the etherification reaction is performed at a temperature of 70-110 ℃ for 48-72 h.

7. Use according to claim 2, characterized in that, The constant potential polymerization is performed at a voltage of 1.0-1.2 V for 50-80 s, the electrolyte is boron trifluoride etherate, and the dosage ratio of the electrolyte to the deuterated EDOT precursor is 5-15 mL:0.010-0.020 g.

8. The use according to claim 1, characterized in that, When the PEDOT polymer thin film is prepared by electro-polymerizing EDOT, the constant voltage of the polymerization reaction is 0.8-1.1 V for 20-50 s, and the dosage ratio of the boron trifluoride etherate to the EDOT is 5-15 mL:0.010-0.020 g.

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