KR20200028594A - Method for preparing graphene quantum dot - Google Patents

Abstract

The present invention relates to a production method of graphene quantum dots by intercalation of graphite nanoparticles and continuous exfoliation in an aqueous solution. The production method has short process time and the graphene quantum dots produced from the production method have a uniform size and shape. In addition, the amount of defects is minimized and electrical properties are improved.

Description

Manufacturing method of graphene quantum dots {METHOD FOR PREPARING GRAPHENE QUANTUM DOT}

The present application relates to a method for manufacturing graphene quantum dots, and provides a production method capable of producing high-quality graphene quantum dots with little impurities.

Graphene quantum dot (GQD) generally refers to a single or multiple layers of graphene having a lateral size of less than 20 nm. Graphene quantum dots exhibit size, shape, and edge-dependent electrical properties because electron transport is limited to all three spatial dimensions.

Existing graphene, because it does not have a band gap in itself, does not have a semiconductor characteristic and is limited in the application of the electronic device. In general, a method of imparting a band gap of graphene includes doping of a release material, inducing binding inside graphene, and a quantum confinement effect represented by graphene quantum dots. Among these, graphene quantum dots are materials made in the form of dots with a size of 20 nm or less in order to impart the properties of semiconductors to the conductor material, graphene. Conductor material has semiconductor properties. Graphene quantum dots are spotlighted in various energy and display fields due to photoluminescence, high transparency and surface area.

As a method of manufacturing the graphene quantum dots, chemical vapor deposition (chemical vapor deposition: CVD), solution chemical method (solution chemical method), hydrothermal route (hydrothermal route), micro fluidization (micro fluidization), and electrochemical method (electrochemical) method) and the like.

One of the methods of manufacturing a conventional graphene quantum dot relates to a process of oxidizing graphite to produce it using graphene oxide, and then re-reducing it, but such a process requires severe acidic conditions for the synthesis of graphene oxide. Due to the complicated reaction process, a long process time is required, and the yield of graphene quantum dots produced is relatively low compared to the long process time, and environmental problems occur due to use of an oxidizing agent, a strong acid, and a reducing agent. In addition, since the graphene oxide has been reduced, the graphene quantum dots are manufactured in a state in which carbon bonds and oxygen bonds are mixed, not pure carbon bonds, so that the purity of the graphene quantum dots is low.

Also, as a prior art, Korean Patent Publication No. 10-2015-0047326 discloses a method for producing a high-quality graphene quantum dot by generating a graphite interlayer compound from graphite and an alkali metal salt hydrate, and exfoliating graphite, as a reactant. The use of natural graphite flakes having a size of several micrometers to several tens of micrometers has a problem in that the production efficiency of the graphite interlayer compound is low, and the size of the prepared graphene quantum dots is non-uniform.

[Advanced technical literature]

Republic of Korea Patent Publication No. 10-2015-0047326

The present application provides a method for producing graphene quantum dots by intercalation of graphite nanoparticles and continuous exfoliation in an aqueous solution. The manufacturing method has a short process time, and by using graphite nanoparticles of several nanometers as a reactant, graphene quantum dots produced from the manufacturing method have a uniform size and shape, the amount of defects is minimized, and improved electrical properties. Have

In addition, after forming the intercalation composite formed by inserting a dissimilar material into the graphite nanoparticles, the present application uses an electrochemical peeling method (for example, applying a voltage) to the intercalation composite in a foil-shaped substrate. By peeling graphene quantum dots from the interlayer composite, the production yield of high-quality graphene quantum dots is improved.

However, the problems to be solved by the present application are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The first aspect of the present application, the step of introducing a carbon-based layered structure in a reactor containing a solvent; Forming an interlayer insert composite by inserting an interlayer insert between each layer of the carbon-based layered structure; Placing the interlayer composite on a substrate and heat-treating it to weaken the interlayer attractive force of the interlayer composite; And exfoliating the intercalation composite to obtain graphene quantum dots by applying a voltage to the substrate.

The second aspect of the present application provides graphene quantum dots produced by the manufacturing method according to the first aspect of the present application.

The method of manufacturing graphene quantum dots according to the embodiments of the present application is environmentally friendly because the solution process using a solvent does not use harmful chemical solvents or surfactants compared to the prior art, and the manufacturing method is simple. Since it can reduce the cost, it is cost effective and has the advantage of mass production of high quality graphene quantum dots.

The graphene quantum dots manufactured by the method of manufacturing graphene quantum dots according to the embodiments of the present application have advantages of minimizing defects, having a uniform size and shape, and having improved electrical properties.

1 is a flowchart illustrating a method of manufacturing graphene quantum dots according to an embodiment of the present application.
2 shows a schematic diagram for step S200 of the method for manufacturing graphene quantum dots according to an embodiment of the present application.
3 shows a schematic diagram for steps S300 and S400 of the method of manufacturing graphene quantum dots according to an embodiment of the present application.
4 is, in one embodiment of the present application, is a graph of the HRTEM image and size distribution of graphene quantum dots prepared by the method of manufacturing the present graphene quantum dots.
5 is, in one embodiment of the present application, an AFM image of graphene quantum dots produced by the method of manufacturing the graphene quantum dots of the present application.
FIG. 6 is a graph showing a PL spectrum of graphene quantum dots produced by a method of manufacturing graphene quantum dots of the present application in one embodiment of the present application.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present application pertains may easily practice. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present application in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout this specification, when a part is "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another element in between. do.

Throughout this specification, when a member is said to be "on" another member, this includes not only the case where one member abuts another member, but also the case where another member exists between the two members.

Throughout this specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless specifically stated to the contrary.

The terms "about", "substantially", and the like, as used throughout this specification, are used in or at a value close to that value when manufacturing and material tolerances specific to the stated meaning are given, and are understood herein. To aid, accurate or absolute figures are used to prevent unconscionable abusers from unduly using the disclosed disclosure.

The terms "~ (steps)" or "steps of" of the degree used throughout this specification do not mean "steps for".

Throughout the present specification, the term “combination (s)” included in the expression of the marki form means one or more mixtures or combinations selected from the group consisting of the components described in the expression of the marki form, It means to include one or more selected from the group consisting of the above components.

Throughout this specification, the description of “A and / or B” means “A or B, or A and B”.

Hereinafter, embodiments and examples of the present application will be described in detail with reference to the accompanying drawings. However, the present application may not be limited to these embodiments and examples and drawings.

The first aspect of the present application, the step of introducing a carbon-based layered structure in a reactor containing a solvent; Forming an interlayer insert composite by inserting an interlayer insert between each layer of the carbon-based layered structure; Placing the interlayer composite on a substrate and heat-treating it to weaken the interlayer attractive force of the interlayer composite; And exfoliating the intercalation composite to obtain graphene quantum dots by applying a voltage to the substrate.

1 is a flowchart illustrating a method of manufacturing graphene quantum dots according to an embodiment of the present application.

In FIG. 1, S100 includes a step of introducing a carbon-based layered structure 100 into a reactor containing a solvent. S200 includes the step of inserting the interlayer insert 110 between each layer of the carbon-based layered structure 100 to form the interlayer insert composite 200. S300 includes the step of placing the interlayer composite 200 on a substrate and heat-treating it to weaken the interlayer attractive force of the interlayer composite 200. S400 includes the step of obtaining a graphene quantum dot 300 by exfoliating the interlayer insert composite 200 by applying a voltage to the substrate. In S100 to S400, as shown in FIG. 1, each step may proceed in order.

In one embodiment of the present application, the solvent may include, but is not limited to, NMP (N-metyl-2-pyrrolidinone), DMF (N, N-dimethylformamide), or diacetone alcohol. .

In one embodiment of the present application, the carbon-based layered structure 100 may include graphite nanoparticles, graphene nanoparticles, or graphene oxide nanoparticles, but is not limited thereto.

In one embodiment of the present application, the graphite nanoparticles, graphene nanoparticles, or graphene oxide nanoparticles may have a size of about 1 nm to about 20 nm. For example, the graphite nanoparticles, graphene nanoparticles, or graphene oxide nanoparticles are about 1 nm to about 20 nm, about 1 nm to about 15 nm, about 1 nm to about 10 nm, about 1 nm to about 8 nm, about 1 nm to about 5 nm, about 1 nm to about 4 nm, about 1 nm to about 3 nm, about 1 nm to about 2 nm, about 2 nm to about 20 nm, about 2 nm to about 15 nm , About 2 nm to about 10 nm, about 2 nm to about 8 nm, about 2 nm to about 5 nm, about 2 nm to about 4 nm, about 2 nm to about 3 nm, about 3 nm to about 20 nm, about 3 nm to about 15 nm, about 3 nm to about 10 nm, about 3 nm to about 8 nm, about 3 nm to about 5 nm, about 3 nm to about 4 nm, about 4 nm to about 20 nm, about 4 nm To about 15 nm, about 4 nm to about 10 nm, about 4 nm to about 8 nm, about 4 nm to about 5 nm, about 5 nm to about 20 nm, about 5 nm to about 15 nm, about 5 nm to about 10 nm, about 5 nm to about 8 nm, about 8 nm to about 20 nm, about 8 nm to about 15 nm, about 8 nm to about 10 nm, about 10 nm If about 20 nm, but can be from about 10 nm to about 15 nm, or from about 15 nm to about 20 nm, but is not limited thereto. The graphite nanoparticles, graphene nanoparticles, or graphene oxide nanoparticles have the same size as above, so that the interlayer insert 110 is interposed between the layers of the interlayer insert composite 200 to be prepared to fit the size of the graphene quantum dots To improve the quality, or production yield.

In one embodiment of the present application, the interlayer insert 110 may include an alkali metal salt or an alkaline earth metal salt. The interlayer insert 110 may include cations of alkali metals and alkaline earth metals or anions of sulfuric acid and phosphoric acid, but is not limited thereto. For example, the intercalation insert 110 may be potassium sodium tartrate hydrate (KNaC ₄ H ₄ O ₆ · 4H ₂ O), sulfuric acid (H ₂ SO ₄ ), phosphoric acid (H ₃ PO4), ammonium sulfate ( As an inorganic salt such as (NH ₄ ) ₂ SO ₄ ), sodium sulfate (Na ₂ SO ₄ ), potassium sulfate (K ₂ SO ₄ ), those purchased from Aldrich can be used, but there are no special restrictions on the type. Does not.

In one embodiment of the present application, the alkali metal may be, for example, Li, Na, K, etc., and the alkaline earth metal may be, for example, Be, Mg, Ca, etc., but is not limited thereto.

2 shows a schematic diagram for step S200 of the method for manufacturing graphene quantum dots according to an embodiment of the present application.

Step S200 may include the step of inserting an interlayer insert 110 between each layer of the carbon-based layered structure 100 to form an interlayer insert composite 200.

Referring to FIG. 2, after the carbon-based layered structure 100 is introduced into the reactor, when the inter-layer insert 110 is introduced, the inter-layer insert 110 is diffused through the carbon-based layered structure 100. ), And consequently, to form the intercalation composite 200.

The carbon-based layered structure 100 may be, for example, graphite nanoparticles, and the graphite nanoparticles may have a layered structure.

The intercalation complex 200 may include, for example, potassium sodium tartrate hydrate (KNaC ₄ H ₄ O ₆ · 4H ₂ O) as an interlayer insert 110 between layers of graphite nanoparticles, Internally, the attraction force between the carbon-based layered structure 100 and the interlayer insert 110 may act.

In one embodiment of the present application, when the intercalation insert 110 is inserted into the carbon-based layered structure 100 by including the alkali metal or the alkaline earth metal element, the interlayer attraction of the carbon-based layered structure 100 By reducing, each layer of the layered structure may be easily separated from each other, but is not limited thereto.

In one embodiment of the present application, alkali metal salts having alkali metals (Li, Na, K, Rb, Cs) as cations or alkaline earth metals having alkaline earth metals (Be, Mg, Ca, Sr, Ba) as cations There are two possible methods for obtaining alkali metal ions or alkaline earth metal ions from salts.

In one embodiment of the present application, one method of obtaining alkali metal ions or alkaline earth metal ions from alkali metal salts or alkaline earth metal salts is by heating the alkali metal salt or alkaline earth metal salt together to a melting point or higher. At this time, when two or more salts are added together, the melting point is lowered at a specific mixing molar ratio of the two or more salts. The molar ratio and temperature point at this time are called eutectic points, and can be seen through the phase diagram of two or more salts.

Another method of obtaining alkali metal ions or alkaline earth metal ions from alkali metal salts or alkaline earth metal salts is to dissolve the salt by adding a solvent. Compared to the first method, since it is not necessary to raise the process temperature to the melting point of the salt, the process temperature can be further reduced.

In order to obtain alkali metal ions or alkaline earth metal ions from alkali metal salts or alkaline earth metal salts, a salt mixture containing two or more salts is preferably used. At this time, like KI and KCl, cations may be the same and different anions may use different salts, and ions such as KI and LiI may be different, but salts having the same anion may be used. In addition, it is possible to have different anions and cations, such as KI and LiCl. That is, any kind can be used as long as it is a salt containing an alkali metal or an alkaline earth metal in the cation.

In one embodiment of the present application, a salt mixture comprising two or more alkali metal salts or alkaline earth metal salts can be prepared as a mixture by mixing with graphite. In addition, the salt mixture may be melted by heating the mixture to a eutectic point of the salt mixture or a salt mixture may be dissolved by adding a solvent to the mixture.

In one embodiment of the present application, a graphite interlayer compound, that is, an intercalation complex 200 may be formed using cations of alkali metals and alkaline earth metals or anions of sulfuric acid and phosphoric acid.

In one embodiment of the present application, the substrate may include aluminum foil, copper foil, or graphite foil, but is not limited thereto.

In one embodiment of the present application, it may be to further include the step of ultrasonic treatment of the complex 200, but is not limited thereto. The manufacturing method of the present application further comprises the step of sonication (ultrasonication) of the composite, the intercalation complex 200 is easily and flawlessly peeled by the ultrasonic wave to improve the production yield of the graphene quantum dot 300 You can.

The step of forming the interlayer insert composite 200 by inserting the interlayer insert 110 between each layer of the carbon-based layered structure 100 includes the carbon-based layered structure 100 and the interlayer in the reactor containing the solvent. And inserting the insert 110 to mix. By including and mixing the carbon-based layered structure 100 and the interlayer insert 110 together, the interlayer insert 110 is positioned between the layers of the carbon-based layered structure 100, and the interlayer attraction It may be a role of peeling by weakening, but is not limited thereto.

The formation of the intercalation complex 200 containing an alkali metal or alkaline earth metal element is spontaneously generated as cations of alkali metals and alkaline earth metals or anions of sulfuric acid and phosphoric acid are inserted through the diffusion process into the layers of the carbon-based layered structure. You can. The cation of the alkali metal and alkaline earth metal or the anion of sulfuric acid and phosphoric acid can calculate the diffusion distance through the diffusivity, thereby predicting the average size of the product.

In one embodiment of the present application, when the intercalation complex 200 is formed using an intercalation insert (including an alkali metal or alkaline earth metal), the intercalation insert (including an alkali metal or alkaline earth metal element) is graphite through diffusion. It can be inserted between the layers of nanoparticles.

FIG. 3 is a schematic diagram showing that graphene quantum dots are obtained by steps S300 and S400 in the method of manufacturing graphene quantum dots according to an embodiment of the present application.

Referring to FIG. 3, the interlayer insert composite 200 obtained in step S200 is heat-treated through steps S300 and S400, and a voltage is applied to facilitate graphene quantum dots 300 from the interlayer insert composite 200 Can be obtained by peeling off. In addition, the interlayer insert composite 200 may be placed on a substrate and a voltage may be applied to separate the graphene quantum dot 300 and the interlayer insert 110.

In order to weaken the interlayer attractive force of the interlayer insert composite 200, in the step of placing and heat-treating the interlayer insert composite 200 on a substrate, the heat treatment may be performed at a temperature of about 100 ° C to about 300 ° C. For example, the heat treatment is about 100 ℃ to about 300 ℃, about 100 ℃ to about 250 ℃, about 100 ℃ to about 200 ℃, about 100 ℃ to about 150 ℃, about 150 ℃ to about 300 ℃, about 150 ℃ To about 250 ° C, about 150 ° C to about 200 ° C, about 200 ° C to about 300 ° C, about 200 ° C to about 250 ° C, or about 250 ° C to about 300 ° C. By performing the heat treatment in the temperature range, the interlayer insert 110 inside the manufactured interlayer composite 200 weakens the interlayer attraction of the carbon-based layered structure 100 so that separation of the layers can more easily occur. It may be.

In the step of obtaining a graphene quantum dot 300 from the interlayer insertion complex 200 by applying a voltage to the substrate, the voltage applied to the substrate may be about -0.1V to about -5V, but is not limited thereto. . For example, the voltage is about -0.1V to about -5V, about -0.1V to about -3V, about -0.1V to about -2V, about -0.1V to about -1V, about -1V to about -5V , About -1V to about -3V, about -1V to about -2V, about -2V to about -5V, about -2V to about -3V, or about -3V to about -5V. By the applied voltage, the graphene quantum dot 300 may be obtained by peeling or separating from the interlayer insert composite 200 located on the substrate to a uniform size, but is not limited thereto.

In one embodiment of the present application, the carbon-based layered structure 100 and the interlayer insert 110 may have a weight ratio of about 10:90, but are not limited thereto.

In one embodiment of the present application, the weight ratio of the carbon-based layered structure 100 and the interlayer insert 110 is, for example, about 5:95, about 10:90, about 20:80, about 30:70, It may be about 40: 60, or about 50: 50, but is not limited thereto. By having the weight ratio as described above, when an intercalation insert is inserted between the layers of the carbon-based layered structure, exfoliation of the carbon-based layered structure can be more actively performed by adjusting the interlayer attraction force to a desired level. It may be, but is not limited thereto.

The second aspect of the present application provides a graphene quantum dot produced from a method of manufacturing a graphene quantum dot according to the first aspect of the present application.

With respect to the second aspect of the present application, the description according to the first aspect of the present application may be applied, and the application thereof is not excluded by omitting the description.

In one embodiment of the present application, the graphene quantum dot according to the second aspect of the present application is manufactured by the manufacturing method according to the first aspect of the present application, thereby using a solution process that does not use a surfactant and / or a chemical solvent. The defect is minimized, it has a blue light emission characteristic (365 nm) under ultraviolet light, may have a uniform size and shape, but is not limited thereto.

 [ Example ]

One. Graphene Quantum dots  Manufacturing method

For the production of graphene quantum dots, graphite nanoparticles (SkySpring Nanomaterials, USA) having a diameter of about 3 nm to about 4 nm were prepared as the carbon-based layered structure 100. The graphite nanoparticles were mixed with potassium sodium tartrate hydrate (KNaC ₄ H ₄ O ₆ · 4H ₂ O, Aldrich) at a ratio of 10:90 by induction for 1 hour. Then, the mixture was placed in a hydrothermal synthesis reactor (Teflon-lined autoclave) and treated at a temperature of 250 ° C. for 10 hours to insert the potassium sodium tartrate hydrate into the interlayer of graphite nanoparticles (200: graphite intercalation compound) , GIC). Graphene quantum dots 300 having a diameter of about 3 nm to about 4 nm are exfoliated by exfoliating each layer of graphite by placing a graphite intercalation compound prepared therefrom and applying a voltage on the aluminum foil. It was prepared. The prepared graphene quantum dots were obtained by processing for 30 minutes at 13,000 rpm using a centrifuge.

After removing the supernatant, the graphene quantum dots were redispersed in purified water, and dialyzed against a cellulose dialysis membrane (MWCO 6000-8000 Da) for 5 days to remove the remaining salt. The graphene quantum dot aqueous solution was ultra-filtrated using a syringe filter (Whatman, Anotop, Sigma-Aldrich) having a pore size of 20 nm. The yield of synthesized graphene quantum dots was measured by fluorescence analysis.

2. Characterization

4 is, in one embodiment of the present application, is a graph of the HRTEM image and size distribution of graphene quantum dots prepared by the method of manufacturing the present graphene quantum dots. HRTEM (High Resolution TEM) image means a high magnification image obtained by enlarging a TEM (Transmission Electron Microscopy) image.

The diameter of the graphene quantum dots is about 2 nm to about 5 nm, and the average diameter of the graphene quantum dots is about 3.5 nm, which has a narrow size distribution. These graphene quantum dots showed a uniform crystal structure with an interstitial distance of about 0.21 nm, which coincides with the hexagonal lattice plane of the graphene of d ₁₁₀₀ .

5 is, in one embodiment of the present application, an AFM image of graphene quantum dots produced by the method of manufacturing the graphene quantum dots of the present application.

The AFM images of FIG. 5 show a topographical schematic diagram and graphene distribution of quantum dots. It shows that the average thickness of the prepared graphene quantum dots is about 1.09 nm, and the thickness distribution is in the range of about 0.5 to about 1.5 nm. Considering that the spacing between successive graphene layers is 0.34 nm, it can be confirmed that the AFM results are made of about 1 to about 3 layered graphene quantum dots.

FIG. 6 is a graph showing a PL spectrum of graphene quantum dots produced by a method of manufacturing graphene quantum dots of the present application in one embodiment of the present application.

The dispersion degree of the synthesized graphene quantum dots appeared as a light brown series under daylight, and showed a fluorescence characteristic (PL) of light blue (365 nm) under ultraviolet light. Similar to the graphene quantum dots produced by other manufacturing methods, the graphene quantum dots produced by the manufacturing method of the present application efficiently absorbed ultraviolet rays. It is known that the ð-ð * transition of the sp ² domain of the aromatic compound absorbs strong ultraviolet light below 300 nm. The UV absorption spectrum of the prepared graphene quantum dots showed two absorption bands at about 250 nm and about 360 nm, respectively, such as the carbine of the zig-zag edge of the graphene quantum dots 3 The σ-ð, and ð-ð * transitions were shown from the heavy binding state. The graphene quantum dot suspension exhibited different PL intensities and different excitation wavelengths. The excitation wavelength varied from about 300 nm to about 460 nm. PL intensity decreased with increasing excitation wavelength. The maximum emission intensity from graphene quantum dots was achieved at about 420 nm when excited at 300 nm.

As a result, in the method of manufacturing the graphene quantum dots of the present application, a carbon-based layered structure and an interlayer insert were used to form an interlayer insert composite and peeled to obtain uniform and high-quality graphene quantum dots. The manufacturing method uses water without an organic solvent or surfactant, and thus is cost-effective and environmentally friendly. The potassium sodium tartrate hydrate served as a solvent for the solution process, as well as the exfoliation and intercalation of graphene quantum dots in the synthesis process. The synthesis process time was up to 14 hours, significantly reduced compared to the prior art. The graphene quantum dots prepared by the above manufacturing method were uniform in size, exhibited a circular shape with a diameter of about 3.5 nm and a structure of about 1 to 3 layers, and exhibited blue fluorescence properties under ultraviolet light (365 nm).

From the above results, the graphene quantum dots manufactured by the manufacturing method of the present application can be mass-produced with an equal size, and the amount of defects is minimized, such as an electrode, a light emitting device, a sensor (temperature sensor or gas sensor), and a solar cell. It can be used in various fields such as. In addition, the manufacturing method of the present application has the advantage of uniformity in the size of graphene quantum dots produced by using graphite nanoparticles having a size of several to several tens of nanometers as a reactant. The manufacturing yield of the graphene quantum dot has the advantage of being improved.

The above description of the present application is for illustrative purposes, and those skilled in the art to which the present application pertains will understand that it is possible to easily modify to other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present application is indicated by the claims, which will be described later, rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present application.

100: carbon-based layered structure
110: interlayer insert
200: interlayer composite
300: graphene quantum dots

Claims (8)

Introducing a carbon-based layered structure into a reactor containing a solvent;
Forming an interlayer insert composite by inserting an interlayer insert between each layer of the carbon-based layered structure;
Placing the interlayer composite on a substrate and heat-treating it to weaken the interlayer attractive force of the interlayer composite; And
Applying a voltage to the substrate to peel the intercalation composite to obtain graphene quantum dots
Graphene quantum dot manufacturing method comprising a.
According to claim 1,
The carbon-based layered structure and the interlayer insert having a weight ratio of 10: 90, graphene quantum dot manufacturing method.
According to claim 1,
The solvent is NMP (N-metyl-2-pyrrolidinone), DMF (N, N-dimethylformamide), or containing a diacetone alcohol (diacetone alcohol), a method for producing graphene quantum dots.
According to claim 1,
The carbon-based layered structure is graphite nanoparticles, graphene nanoparticles, or will include a graphene oxide nanoparticles, graphene quantum dot manufacturing method.
According to claim 1,
The interlayer insert comprises an alkali metal salt, or an alkaline earth metal salt, a method for producing graphene quantum dots.
According to claim 1,
The substrate is an aluminum foil, a copper foil, or a graphite foil, a method for producing graphene quantum dots.
According to claim 1,
A method of manufacturing a graphene quantum dot further comprising the step of sonication the complex.
Graphene quantum dots produced by the manufacturing method according to claim 1.

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