KR101528261B1 - Manufacturing method for polyaniline nanofiber-hydroxyl group enriched reduced graphene oxide complex - Google Patents

Abstract

The present invention relates to a method for manufacturing a polyaniline-nanofiber-hydroxyl group enriched reduced graphene oxide complex. The present invention provides the method for manufacturing the polyaniline-nanofiber-hydroxyl group enriched reduced graphene oxide complex for a supercapacitor which includes a first step of adding aniline solutions to acid solutions, a second step of forming a polyaniline-nanofiber, a third step of removing salt and non-reactive monomer, a fourth step of reducing the concentration of acid, a fifth step of separating the polyaniline-nanofiber coagulated in distilled water, and a sixth step of manufacturing a polyaniline-nanofiber-hydroxyl group enriched reduced graphene oxide synthetic film.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide composite, and more particularly, to a polyaniline nanofiber-

The present invention relates to a method for producing a polyaniline nanofiber-hydroxyl group rich graphene oxide composite, and more particularly, to a method for producing a polyaniline nanofiber-hydroxyl group rich reduced graphene oxide composite which can be used for a supercapacitor, To a composite produced by the production method.

Graphene is the thinnest of all known materials, yet it is the strongest and most flexible material, as well as the best able to conduct electricity and heat. Such graphene is expected to be used as a structural material due to its excellent properties or to replace Si electronic devices. Specifically, graphene is being used as a new material in next generation display fields such as flexible display and touch panel, energy industry such as solar cell, smart window, RFID and various electronic industries.

On the other hand, graphene oxide and reduced graphene oxide are materials having a surface area larger than that of graphite, high electric conductivity, and high mechanical strength. Such graphene oxide (GO) and reduced graphene oxide (RGO) have been attracting attention for various applications and are known to be highly applicable to biosensors, cell imaging, drug delivery, and batteries have.

The electrical properties of graphene include bipolar supercurrent, spin transport, and quantum hole effect.

At present, graphene is attracting attention as a material that can be used as a basic unit for integrating carbon-based nanoelectronic devices, and the availability of graphene as an electrode material is also infinite.

However, since the storage capacity is not yet large, it is necessary to develop to meet a larger storage capacity.

Korean Patent Publication No. 10-2014-0044045

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a method for producing a polyaniline composite material, which comprises a hydroxyl group-enriched reduced graphene oxide (HRGO) Nanofibers (PANI-NF, Polyaniline-Nanofiber) to enable the polyaniline nanofibers to be successfully interposed in the graphene oxide layer. Specifically, a polyaniline nanofiber can be effectively interposed and bonded to a reduced graphene oxide layer rich in hydroxyl groups, so that it can be utilized as a super capacitor having a greatly increased storage capacity.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method for preparing a reduced graphene oxide composite material rich in polyaniline nanofibers and hydroxyl groups for a supercapacitor, comprising: a first step of adding an aniline solution to an acidic solution; A second step of adding an ammonium persulfate solution to an acidic aniline solution and then performing a polymerization reaction to form a polyaniline nanofiber; Dialyzing the solution with an acidic solution to remove unreacted monomers and salts; A fourth step of dialyzing unreacted monomers and salt-removed polyaniline nanofibers under distilled water to lower the concentration of acid; A fifth step of diluting the dialyzed polyaniline nanofibers with distilled water to ultrasonically pulverize the diluted solution to separate the aggregated polyaniline nanofibers in the distilled water; And the reduced polyaniline nanofibers were slowly mixed with a reduced graphene oxide rich in hydroxyl groups, and then ultrasonically pulverized to remove the aggregated molecules. Then, the particles were filtered through a porous alumina membrane to obtain a reduced polyaniline nanofiber-hydroxyl group- And a sixth step of producing a graphene oxide composite film.

The details of other embodiments are included in the detailed description of the invention.

The polyaniline nanofibers for a supercapacitor of the present invention and the reduced graphene oxide complex enriched in a hydroxyl group can effectively absorb and bind the polyaniline nanofibers between the graphene layers to thereby provide a larger graphene oxide than the general hydroxyl group- Surface area, and as a pseudo capacitor, the storage capacity as an electric double-layer capacitor (EDLC), which is a graphen's unique electric double-layer capacitor (EDLC), is combined, so that a very large capacitance can be exhibited when used as a capacitor.

1 is a schematic view showing a method for producing a polyaniline nanofiber according to an embodiment of the present invention.
FIG. 2 is a schematic view showing a process for producing a polyaniline nanofiber and a hydroxyl group-rich reduced graphene oxide composite film according to an embodiment of the present invention.
FIG. 3 is a graph showing XPS spectra by X-ray photoelectron spectroscopy. Panel (A) is XPS spectral data of a hydroxyl group-rich reduced graphene oxide, Panel (B) is polyaniline nanofiber- XPS spectral data of the graphene oxide composite show that the panel (A) contains no nitrogen but the panel (B) contains nitrogen.
4 is a scanning electron microscope (SEM) image of a polyaniline nanofiber according to an embodiment of the present invention.
5 is a scanning electron microscope (SEM) image of a cross section of a hydroxyl group-rich reduced graphene oxide according to an embodiment of the present invention.
6 is a scanning electron microscope (SEM) image of a cross section of a polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide composite according to an embodiment of the present invention.
FIG. 7 is a graph showing a relationship between a voltage of 20 mV / s (100 keV) and a voltage of 20 mV / s for a polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide (PANI-NF / HRGO) according to an embodiment of the present invention And the electrochemical data according to the cyclic voltammetric curves measured at the scanning speed of the scanning electron microscope.
FIG. 8 is a graph showing the results of a constant current charge / discharge cycle for a graphite oxide (HRGO) and a polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide (PANI-NF / HRGO) according to an embodiment of the present invention And the specific charge capacity at a plurality of current densities.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to fully inform the owner of the scope of the invention.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a first step of adding an aniline solution to an acidic solution; A second step of adding an ammonium persulfate solution to an acidic aniline solution and then performing a polymerization reaction to form a polyaniline nanofiber; Dialyzing the solution with an acidic solution to remove unreacted monomers and salts; A fourth step of dialyzing unreacted monomers and salt-removed polyaniline nanofibers under distilled water to lower the concentration of acid; A fifth step of diluting the dialyzed polyaniline nanofibers with distilled water to ultrasonically pulverize the diluted solution to separate the aggregated polyaniline nanofibers in the distilled water; And the reduced polyaniline nanofibers were slowly mixed with a reduced graphene oxide rich in hydroxyl groups, and then ultrasonically pulverized to remove the aggregated molecules. Then, the particles were filtered through a porous alumina membrane to obtain a reduced polyaniline nanofiber-hydroxyl group- And a sixth step of preparing a graphene oxide synthetic film, wherein the polyaniline nanofibers for a supercapacitor - a method for producing a reduced graphene oxide composite enriched in a hydroxyl group are provided.

According to another aspect of the present invention, there is provided a reduced polyaniline nanofiber-hydroxyl group-rich graphene oxide composite produced by the above production method.

Hereinafter, a method for producing a reduced graphene oxide composite rich in polyaniline nanofibers-hydroxyl groups for a supercapacitor according to the present invention will be described in detail.

The first and second steps relate to a method for producing polyaniline nanofibers. We begin by dissolving the aniline solution in an acidic solution to prepare the polyaniline solution. The concentration of the aniline solution may vary, and an aniline solution of 0.001 to 0.1 M concentration may be used as an example. The aniline solution is again dissolved in the acidic solution. As the acidic solution, various acidic solutions can be used. For example, the acidic solution may contain HCl, HBr, HI, H ₂ SO ₄ , H ₃ PO ₄ , HNO ₃ , HClO ₄ And the like may be used, but the present invention is not limited thereto. The concentration of the acidic solution may be varied, but the range of the preferred embodiment of the present invention may be adjusted within the range of 0.5 to 2 M (more specifically, 0.8 to 2 M) to initiate the synthesis. An oxidant may also be added to effect polymerization of the aniline monomers. As the oxidizing agent, various oxidizing agents for preparing polyaniline can be used. For example, ammonium persulfate ((NH ₄ ) ₂ S ₂ O ₈ ) or K ₂ S ₂ O ₈ can be added. The concentration of the oxidizing agent may be treated with an appropriate concentration conditions for a polymerization reaction, for example from 0.001 to _{0.1 M (NH 4) 2 S} 2 O 8 It is possible to add it within the range of

At this time, since the oxidizing agent can be used as a polymerization initiator, it is preferable to add the oxidizing agent to the acid solution in which the aniline is dissolved by a small amount, and the agent may be added slowly using a mechanism such as a syringe. (NH _{4) 2} rate of adding the S ₂ O ₈ solution and the rate of 5 to 100 mL / h preferably, sikimyeo more preferably added at a rate of 20 to 50 mL / h, most preferably 25 to 35 mL < / RTI > As a result, the aniline contained in the aniline solution may undergo polymerization reaction and reaction with polyaniline nanofibers. At this time, the reaction is carried out overnight without using the stirrer.

The third step is to remove unreacted aniline monomers (monomers) that have not yet participated in the reaction and salts remaining after the reaction, although the polyaniline nanofibers are formed after the reaction. Unreacted aniline monomers and salts can be removed by dialysis. The solution containing the reacted polyaniline nanofibers and unreacted aniline monomer and salt may be dialyzed with a pH-adjusted acidic solution to remove monomers and salts. Preferably dialked with an acidic solution such as HCl, HBr, HI, H ₂ SO ₄ , H ₃ PO ₄ , HNO ₃ or HClO _{4 in the} range of pH 2.5 to 3.5 and most preferably HCl Dialyzed with a solution. The dialyzed solution is then dialyzed with dilute HCl at a pH of 2.6 to 2.8 and can be chilled and stored in a refrigerator using an ultrasonic sonicator.

In the fourth step, unreacted monomers and salt-removed polyaniline nanofibers are dialyzed under distilled water to lower the acid concentration. In order to prepare polyaniline nanofibers and a hydroxyl group-rich reduced graphene oxide complex, a process of weakening the acidity is required. The polyaniline nanofiber, which is an acidic condition, is dialyzed under distilled water to alleviate the acid. Continue to check the pH condition and replace the distilled water periodically until the pH reaches around 5.

Since the polyaniline is in a state of being clumped together after the polymerization reaction, it is preferable to perform the process of separating the polyaniline nanofibers that are entangled to form a reduced graphene oxide complex having a hydroxyl group.

In the fifth step, distilled water is added to the dialyzed polyaniline nanofibers to dilute them, and the diluted solution is ultrasonically pulverized to separate the aggregated polyaniline nanofibers in the distilled water. The concentrated polyaniline nanofiber may be diluted with 0.01 to 1 mg / mL of distilled water, more preferably 0.05 to 0.3 mg / mL, and then the aggregated polyaniline nanofibers can be separated using an ultrasonic mill.

After sufficiently separating the aggregated polyaniline nanofibers using an ultrasonic mill, the reduced graphene oxide rich in hydroxyl groups was slowly mixed according to various mass ratios, and then the aggregated molecules were removed using an ultrasonic grinder do.

Both the oxidized graphene oxide and the hydroxyl group-rich reduced graphene oxide according to an embodiment of the present invention can be produced using the method described in Korean Patent Laid-open No. 10-2014-0044045.

For example, according to the Hummers method described in Korean Patent Publication No. 10-2014-0044045, Hummers, W .; Offeman, R. J. Am. Chem. Soc. 1958, 80, 1339., Cote, L. J .; Kim, F .; Huang, J. J. Am. Chem. Soc. 2009, 131, 1043-1049., Xu, Y .; Wu, Q .; Sun, Y .; Bai, H .; Shi, G. ACS Nano 2010, 4, 7358-7362.

As another example, a reduced graphene oxide rich in hydroxyl groups may be prepared by a) contacting graphene oxide with K ₂ S ₂ O ₈ or (NH ₄ ) ₂ S ₂ O ₈ Adding an oxidizing agent at a weight ratio of 1: 0.5 to 10, and then heating the mixture at 50 to 100 DEG C for 1 to 12 hours (e.g., at 60 DEG C for 12 hours) to introduce hydroxyl group; And b) adding a hydrazine, NaOH or NaBH ₄ Adding a reducing agent, and heating the mixture at 60 to 100 DEG C for 2 to 6 hours to reduce the mixture.

In the sixth step, the reduced graphene nanofibers were slowly mixed with a reduced graphene oxide rich in hydroxyl groups, and then ultrasonically pulverized to remove the aggregated molecules. Then, the particles were filtered through a porous membrane to obtain polyaniline nanofiber-hydroxyl group Is a step of producing a reduced graphene oxide synthetic film rich in a metal oxide. A 0.1 to 0.5 mg / mL, more preferably 0.15 to 0.3 mg / mL hydroxyl group-rich reduced graphene oxide is mixed with the diluted polyaniline nanofibers according to various mass ratios. Thereafter, the polyaniline nanofibers can be easily inserted between the layers of the hydroxyl group-rich reduced graphene oxide to form a polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide composite.

The porous film may be an alumina film, but is not limited thereto. The size of the pores may vary. For example, the diameter of the pores can be used to (vacuum) filter using membranes of 0.1 to 1 micrometer, more preferably 0.3 to 0.6 micrometer, and most preferably 0.4 to 0.5 micrometer holes. By vacuum filtration of the produced molecules, it is possible to produce a polyaniline nanofiber-hydroxyl-group-rich reduced graphene oxide synthesis film.

Hereinafter, the present invention will be described more specifically by way of examples. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

Example  One. Polyaniline  Nanofiber ( PANI - NF ) Synthesis process

0.02 M dissolved in the aniline solution in 1 M HCl 10 mL, 0.01 M (NH 4) 2 S 2 O 8 The solution in 10 mL of 1 M HCl was slowly added at a rate of 30 mL / h using a syringe. This solution was left overnight without any agitator to complete the reaction.

The reaction solution was dialyzed with HCl solution adjusted to pH 3 to remove unconverted monomers and salts. Thereafter, the dialyzed solution was adjusted to pH 2.6 to 2.8 with diluted HCl, and then the solution was cleaved with an ultrasonic mill and then refrigerated. The overall manufacturing process is shown in Fig.

Example  2. Hydroxyl group - abundantly reduced Grapina  oxide( Hydroxyl group - rich graphene  oxide, HRGO )

2-1. Grapina  oxide( Graphene oxide , GO )

Graphene oxide was prepared according to the modified Hummers method by Hummers, W .; Offeman, RJ Am. Chem. Soc. 1958, 80, 1339., Cote, LJ; Kim, F .; Huang, JJ Am. Chem. Soc. 2009, 131, 1043-1049., Xu, Y .; Wu, Q .; Sun, Y .; Bai, H .; Shi, G. ACS Nano 2010, 4, 7358-7362.

2-2. Peroxodisulfate  Oxidized by Grapina  oxide( Peroxodisulfate 산화제  graphene oxide , PGO )

A 50 mg / mL K ₂ S ₂ O ₈ solution was added to a 1 mg / mL graphene oxide solution so that the mass ratio of graphene oxide and K ₂ S ₂ O ₈ was 1: 5. Thereafter, before the mixture was heated, the whole environment was changed to nitrogen by the Schlenk method, and then the resultant was placed in a sonication apparatus and heated at 60 DEG C for 12 hours to introduce a hydroxyl group onto the surface of the graphene oxide, Peroxodisulfate oxidized graphene oxide (PGO) was prepared. After the reaction was completed, the reaction mixture was dialyzed for 2 weeks to remove the remaining K ₂ S ₂ O ₈ .

2-3. Hydroxyl group - abundantly reduced Grapina  oxide( Hydroxyl group - rich graphene  oxide, HRGO )

100 mL of ammonia water was added to 100 mL of the graphene oxide oxidized with 0.2 mg / mL of the peroxodisulfate to adjust the pH to 10.6. Subsequently, 55 μL of hydrazine was added thereto, and the mixture was heated in an oil bath at 85 ° C. for 4 hours. The reaction mixture was cooled at room temperature and then centrifuged to allow the agglomerated particles to settle and the supernatant was collected. Reduced graphene oxide was prepared.

Example  3. Polyaniline  Nanofibers and Hydroxyl  Group abundance reduced Grapina  Oxide composite film manufacturing process

The polyaniline nanofibers prepared in Example 1 were dialyzed under distilled water to remove HCl. At this time, the distilled water was periodically exchanged until the pH of the polyaniline nanofiber solution reached about 5.

The dialyzed polyaniline nanofibers diluted with distilled water were diluted with distilled water to 0.1 mg / mL, and the polyaniline nanofibers agglomerated by an ultrasonic mill were separated. The diluted polyaniline nanofibers were slowly mixed with 0.2 mg / mL of the hydroxyl group-rich reduced graphene oxide prepared in Example 2, and then the aggregated molecules were removed using ultrasonic milling. The prepared molecule was vacuum filtered through an alumina membrane having a diameter of 0.45 micrometer holes to prepare a polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide synthesis film. The overall manufacturing process is shown in Fig.

Experimental Example  1. x-ray photoelectron spectroscopy (x- ray photoelectron spectroscopy , XPS ) analysis

X-ray photoelectron spectroscopy analysis was carried out to confirm whether polyaniline nanofibers intercalated in the hydroxyl group-rich reduced graphene oxide to form a complex, and the results are shown in FIG.

The panel (A) of FIG. 3 was confirmed by x-ray photoelectron spectroscopy data on the hydroxyl group-rich reduced graphene oxide itself to contain only carbon and oxygen. The panel (B) of FIG. 3 confirms that x-ray photoelectron spectroscopy data on the hydroxyl group-rich reduced graphene oxide / polyaniline nanofiber (HRGO / PANI-NF) complexes contain carbon as well as oxygen as well as nitrogen I could. As a result, it was confirmed that the polyaniline nanofiber was well inserted into the hydroxyl group-rich reduced graphene oxide and the complex formed well.

Experimental Example  2. HRGO / PANI - NF Of a scanning electron microscope Scanning Electron Microscope , SEM ) observe

To confirm that the hydroxyl group-rich reduced graphene oxide / polyaniline nanofibers were actually well formed, they were confirmed using a scanning electron microscope (SEM).

As shown in FIG. 4, it was confirmed that the polyaniline nanofiber was sufficiently complexed with the hydroxyl group-rich reduced graphene oxide.

5 and 6 are SEM images of a cross section of a film made only of a hydroxyl group-rich reduced graphene oxide and a SEM image of a section of a hydroxyl group-rich reduced graphene oxide / polyaniline nanofiber composite Image.

FIG. 5 shows that a plurality of hydroxyl group-rich reduced graphene oxide layers are stacked. FIG. 6 shows that polyaniline nanofibers are sandwiched between graphene layers due to addition of polyaniline nanofibers . As a result, it was confirmed that the polyaniline nanofibers were not attached to only the outer surface of the graphene oxide but could be sandwiched between the graphene oxide layers. In addition, it was confirmed that the synthesis surface of the hydroxyl group-rich reduced graphene oxide / polyaniline nanofiber composite film had a larger surface area.

Experimental Example  3. HRGO / PANI - NF Cyclic voltammetry method ( Cyclic Voltammetry , CV )

The HRGO / PANI-NF electrode was used as the working electrode, the platinum (Pt) electrode was used as the counter electrode, and the Ag / AgCl electrode was used as the reference electrode. Subsequently, And the electrochemical oxidation reaction was observed at a scanning rate of 20 mV / s. In the comparative example, only the HRGO was used as the working electrode and the rest of the conditions were the same, and it was observed that the electrochemical oxidation reaction occurred, which is shown in FIG.

Referring to FIG. 7, it can be seen that the HRGO / PANI-NF shows a much larger current value than HRGO. In this curve, it was found that larger capacitive capacities could be obtained as a conductive polymer by observing the larger oxidation-reduction movements of the polyaniline nanofibers in the hydroxyl group-rich reduced graphene oxide and polyaniline nanofiber composite.

Experimental Example  4. HRGO / PANI - NF Constant current Charge and discharge  Determination of specific charge capacity at current density used

HRGO / PANI-NF and HRGO as a comparative example thereof were subjected to a constant current charge / discharge test and are shown in FIG. Referring to FIG. 8, a specific charging capacity (r / g) was confirmed at various current densities of 1 to 10 A / g, and HRGO / PANI-NF was found to be 4 to 6 times It was confirmed that a specific charging capacity appeared. As a result, it was confirmed that a larger non-storage capacity was realized in the hydroxyl group-rich reduced graphene oxide and the polyaniline nanofiber composite. This is because the characteristics as a pseudo capacitor and the storage capacity of graphene as an electric double-layer capacitor (EDLC) are added to have a larger surface area than a general hydroxyl group-rich reduced graphene oxide itself, It is believed that a larger storage capacity is exhibited.

This indicates that the abundant hydroxyl group can bond more specifically to the positively charged polyaniline nanofibers because they have a large negative charge on the graphene and that the polyaniline nanofibers can penetrate well between the graphene layers.

As a result, the electrolyte can more easily penetrate the film than the film made of only the graphene layers or the film made of the polyaniline nanofibers alone, and can have a larger non-storage capacity.

Claims (9)

A first step of adding an aniline solution to the acidic solution;
A second step of adding an ammonium persulfate solution to an acidic aniline solution and then performing a polymerization reaction to form a polyaniline nanofiber;
Dialyzing the solution with an acidic solution to remove unreacted monomers and salts;
A fourth step of dialyzing unreacted monomers and salt-removed polyaniline nanofibers under distilled water to lower the concentration of acid;
A fifth step of diluting the dialyzed polyaniline nanofibers with distilled water to ultrasonically pulverize the diluted solution to separate the aggregated polyaniline nanofibers in the distilled water; And
The reduced polyaniline nanofibers were slowly mixed with a reduced graphene oxide rich in hydroxyl groups, and then ultrasonically pulverized to remove the aggregated molecules. Then, the nanoparticles were filtered through a porous alumina membrane to obtain polyaniline nanofibers having a hydroxyl group- A sixth step of producing a pin oxide composite film;
A polyaniline nanofiber for a supercapacitor; and a reduced graphene oxide complex rich in a hydroxyl group.
The method according to claim 1,
In the first step, the acidic solution is an acidic solution of 0.8 to 2 M, and the concentration of the aniline solution is 0.001 to 0.1 M. Polyaniline nanofibers for supercapacitors - Reduced grains rich in hydroxyl groups Wherein the pin oxide complex is formed by a method comprising the steps of:
The method according to claim 1,
In the second step, the ammonium persulfate solution has a concentration of 0.001 to 0.1 M, and the rate of adding the ammonium persulfate solution to the acidic aniline solution is 5 to 100 mL / h. A process for producing reduced graphene oxide complexes rich in fiber-hydroxyl groups.
The method according to claim 1,
Wherein the acidic solution is a hydrochloric acid solution having a pH of 2.5 to 3.5 in the third step. The method of claim 1, wherein the acidic solution is a hydrochloric acid solution having a pH of 2.5 to 3.5.
The method according to claim 1,
The method of claim 1, wherein in the fourth step, distilled water is periodically exchanged in order to reach the concentration of the acid to pH 5. The method of manufacturing the reduced polyaniline nanofiber-hydroxyl group-rich reduced graphene oxide composite for a supercapacitor.
The method according to claim 1,
Wherein the dialyzed polyaniline nanofibers are diluted with distilled water to a concentration of 0.01 to 0.2 mg / mL in the fifth step. The polyaniline nanofibers for a supercapacitor - a method for producing a reduced graphene oxide composite enriched in a hydroxyl group .
The method according to claim 1,
The hydroxyl group-rich reduced graphene oxide
a) adding to the graphene oxide K ₂ S ₂ O ₈ or (NH ₄ ) ₂ S ₂ O ₈ Adding an oxidizing agent at a weight ratio of 1: 0.5 to 10, and then heating at 50 to 100 DEG C for 1 to 12 hours to introduce hydroxyl group; And
b) adding a hydrazine, NaOH or NaBH ₄ solution to the graphene oxide to which the hydroxide of step a) Adding a reducing agent, and heating to 60 to 100 DEG C for 2 to 6 hours to reduce;
Wherein the polyaniline nanofibers for a supercapacitor and the reduced-graphene oxide complex rich in a hydroxyl group are produced.
The method according to claim 1,
In the sixth step, the porous alumina membrane has a diameter of 0.1 to 1 micrometer, and the filtration is a vacuum filtration. The polyaniline nanofibers for a supercapacitor - the method for producing a reduced graphene oxide composite enriched in a hydroxyl group.
9. A reduced graphene oxide composite comprising a polyaniline nanofiber for use in a method according to any one of claims 1 to 8 for hydroxyl-rich polyaniline nanofibers.

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