Flow synthesis process and synthesis equipment for graphene carbon nanoribbons

Abstract

The invention relates to a flow synthesis process and synthesis equipment for graphene carbon nanoribbons, and the flow synthesis process comprises the following steps: taking a graphite plate as an anode and a nickel plate as a cathode, separating the anode from the cathode through a fluorinated ethylene propylene foil, and arranging a reaction channel on the fluorinated ethylene propylene foil; constant voltage is added between the anode and the cathode, DCM, TFA, a precursor biphenyl thiophene, an electrolyte tetrabutylammonium tetrafluoroborate and a medium DDQ are mixed to form a mixed solution, and the mixed solution is electrolyzed through the reaction channel; and after the reaction is completed, removing the organic phase, and concentrating and purifying the remaining solution to obtain a white powdery solid. The flow synthesis equipment comprises a controllable reaction interlayer, a reaction channel is dug in the middle of the controllable reaction interlayer, gas is filled between the upper fluorinated ethylene propylene foil and the lower fluorinated ethylene propylene foil, and the controllable reaction interlayer is clamped between the positive electrode holder and the negative electrode holder.

Description

Technical Field

[0001] The invention relates to the field of graphene carbon nanobelt preparation, and in particular to a flow synthesis process and synthesis equipment for graphene carbon nanobelts. Background Art

[0002] Nanoscale graphene strips (called graphene carbon nanoribbons, GNRs) are quantum confined semiconductors whose band gaps can be adjusted according to the width and edge structure of the nanoribbons, making them promising candidates for the next generation of semiconductors. Other properties of GNRs, including conductivity, on / off ratio, and charge mobility, are also controlled by their width and edge structure. Generally speaking, there are two ways to synthesize graphene carbon nanoribbons: top-down and bottom-up. Top-down GNRs manufacturing methods, such as nanofabrication, sonochemical methods, nanowire lithography, such as using nickel nanoparticles or diamond knives to cut nanoscale graphene and carbon nanotubes, usually produce widths greater than 10 nm and have limited control over their fine structures, especially edge structures. The bottom-up method, on the other hand, is to gradually build the GNRs structure from small aromatics through solution or solid phase organic synthesis or surface polymerization.

[0003] Bottom-up approaches can produce GNRs with narrow dimensions and atomically precise edge structures that are not achievable by any current top-down methods, and solution-based preparation methods can achieve large-scale preparation of GNRs. GNRs synthesized in solution can be conveniently deposited on any available substrate. In the prior art, GNRs are generally prepared by acyclic aromatization of polyphenyl precursors with oxidant iron (III) chloride in polar solvents (Scholl reaction). Although the Scholl reaction can prepare a variety of GNRs, its regioselectivity is often poor and may lead to rearrangement reactions, mainly due to the harsh conditions required for the reaction. In addition, the introduction of oxidation-sensitive functional groups and electron-rich heterocycles is more difficult to achieve, which limits the scope and versatility of the reaction. On the other hand, although methods including alkyne benzyl cyclization and thermal polydiacetylene aromatization can avoid some of the disadvantages of the Scholl reaction, all of these methods are only used to prepare all-phenyl GNRs. Therefore, a more facile method to prepare GNRs that would allow the introduction of a wide variety of functional groups and heterocycles, both electron-poor and electron-rich, is highly desirable.

[0004] The purpose of the present invention is to design a flow synthesis process and synthesis equipment for graphene carbon nanoribbons in view of the problems existing in the above-mentioned prior art. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a flow synthesis process and synthesis equipment for graphene carbon nanoribbons, which can effectively solve at least one problem existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is: A flow synthesis process of graphene carbon nanoribbons comprises the following steps: A graphite plate is used as an anode and a nickel plate is used as a cathode, and the anode and the cathode are separated by a fluorinated ethylene propylene foil, wherein the fluorinated ethylene propylene foil is provided with a reaction channel; A constant voltage is applied between the anode and the cathode, DCM, TFA, a precursor biphenylthiophene, an electrolyte tetrabutylammonium tetrafluoroborate and a medium DDQ are mixed to form a mixed solution, and the mixed solution is electrolyzed through the reaction channel; After the reaction is completed, the organic phase is removed, and the remaining solution is concentrated and purified to obtain a white powdery solid.

[0007] Furthermore, a constant voltage of 1.5-2V is applied between the anode and the cathode.

[0008] Furthermore, after the reaction is completed, the organic phase is removed by extraction with water and dichloromethane, and the remaining solution is concentrated in vacuo and purified by silica gel column chromatography.

[0009] Furthermore, the volume ratio of DCM: TFA is 250~300: 30 mL, the precursor biphenylthiophene is 180~220 mg, 300~350 μmol, 1.0 equivalent, and the electrolyte tetrabutylammonium tetrafluoroborate is 35~45 mmol.

[0010] Further provided is a graphene carbon nanoribbon flow synthesis device for realizing a graphene carbon nanoribbon flow synthesis process, comprising: A frame, wherein the frame is provided with a platform; A positive electrode seat and a negative electrode seat, wherein the positive electrode seat is provided with a graphite plate, the negative electrode seat is provided with a nickel plate, and the positive electrode seat is provided with a liquid inlet and a liquid outlet; A controllable reaction spacer, the controllable reaction spacer is composed of an upper and lower layer of fluorinated ethylene propylene foil, a reaction channel is dug in the middle of the controllable reaction spacer, a gas is filled between the upper and lower layers of the fluorinated ethylene propylene foil, the controllable reaction spacer is sandwiched between the positive electrode seat and the negative electrode seat, and the liquid inlet and the liquid outlet are connected to the two ends of the reaction channel; A camera mechanism is arranged at a position of the positive electrode seat or the negative electrode seat corresponding to the reaction channel; A pressurizing mechanism is disposed above the platform, and the pressurizing mechanism changes the pressure on the positive electrode seat so as to expand or contract the controllable reaction barrier into the reaction channel, thereby reducing or increasing the cross-sectional area of ​​the reaction channel; A control system that performs color analysis based on the image obtained by the camera mechanism to control the pressure of the pressurizing mechanism; A pump body connected to the liquid inlet; A purification mechanism is connected to the liquid outlet.

[0011] Furthermore, a locking hole is provided between the positive electrode seat and the negative electrode seat, and the positive electrode seat and the negative electrode seat are locked by bolts.

[0012] Furthermore, the positive electrode seat and the negative electrode seat are provided with a plurality of springs, and the springs make the positive electrode seat and the negative electrode seat have a tendency to move away from each other.

[0013] Furthermore, the negative electrode seat is provided with a groove body, and the depth of the groove body is less than the thickness of the controllable reaction barrier layer.

[0014] Furthermore, the control system performs color analysis based on the image obtained by the camera mechanism to obtain a current color depth at the corresponding position of the reaction channel, and compares the current color depth with a preset color depth. If the current color depth is greater than the preset color depth, the pressure of the pressurizing mechanism on the positive electrode seat is increased; if the current color depth is less than the preset color depth, the pressure of the pressurizing mechanism on the positive electrode seat is reduced.

[0015] Furthermore, the pressurizing mechanism is provided with a pressure sensor.

[0016] Therefore, the present invention provides the following effects and / or advantages: The preparation method provided in the present application utilizes the redox reaction between the flowing electrodes to realize the chemical reaction, and the reactants are continuously flowed in the electrochemical reaction cell to realize the conversion of the reactants through the electrochemical reaction. During the reaction, the current passes through the electrodes in the electrochemical reaction cell, and the reactants are converted into products. As the flow continues, more and more products are prepared, which improves the reaction efficiency and the purity of the products. At the same time, the flow rate of 0.1 mL min-1 is limited to pass through the flowing electrolyzer, and the synthesis is carried out under milder reaction conditions, thereby reducing unnecessary side reactions while easily controlling the reaction rate and reaction time, so as to better control the reaction process. In the preparation method of the present application, there is no participation of an equivalent-level oxidant, and the use of a catalytic-level oxidant can prepare oxidative dehydrogenation products on the principle of a greener economy.

[0017] The invention uses a flow electrochemical method to prepare GNRs. On the one hand, this method avoids the rearrangement phenomenon in the traditional Scholl reaction and can prepare GNRs with a higher yield. On the other hand, the introduction of electron-rich sulfur has no effect on the reaction, achieving the effect of successful oxidation cyclization, which can not only be obtained with a higher yield but also can be prepared in large quantities. In addition, the synthesis method using flow electrochemistry does not require the addition of an equivalent-level oxidant, which is not achievable in the traditional Scholl reaction, realizing an efficient and green synthesis strategy.

[0018] The flow synthesis equipment provided in the present application controls the distance between the positive electrode seat and the cathode electrode seat, thereby controlling the cross-section of the reaction channel generated by the controllable reaction barrier between the two electrode seats. When the liquid discharge speed of the pump body is fixed, the flow rate of the mixed liquid through the reaction channel can be fine-tuned, thereby accurately controlling the product.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0020] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow electrochemical synthesis route provided for an embodiment of the present invention.

[0022] Figure 2 The graphene carbon nanoribbon synthesized in the embodiment of the present invention 1 H NMR spectrum.

[0023] Figure 3 The graphene carbon nanoribbon synthesized in the embodiment of the present invention 13 C NMR spectrum.

[0024] Figure 4 This is a single crystal diffraction pattern of the graphene carbon nanoribbon synthesized according to an embodiment of the present invention.

[0025] Figure 5 It is a schematic structural diagram of the flow synthesis equipment of the present invention.

[0026] Figure 6 It is a schematic diagram of the structural explosion of the positive electrode seat, the cathode electrode seat and the controllable reaction spacer of the present invention. DETAILED DESCRIPTION

[0027] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings: A flow synthesis process of graphene carbon nanoribbons comprises the following steps: S1, using a graphite plate as an anode and a nickel plate as a cathode, the anode and the cathode are separated by a fluorinated ethylene propylene foil, and the fluorinated ethylene propylene foil is provided with a reaction channel; S2, applying a constant voltage between the anode and the cathode, mixing DCM, TFA, the precursor biphenylthiophene, the electrolyte tetrabutylammonium tetrafluoroborate and the medium DDQ to form a mixed solution, and electrolyzing the mixed solution through the reaction channel; S3, after the reaction is completed, the organic phase is removed, and the remaining solution is concentrated and purified to obtain a white powdery solid.

[0028] In this embodiment, a graphite plate is used as an anode, a nickel plate is used as a cathode, and a fluorinated ethylene propylene foil is used as a diaphragm between the anode and the cathode. A reaction channel is provided on the diaphragm to allow the mixed solution to pass through.

[0029] The mixture consists of the following ingredients: DCM (dichloromethane): used as a solvent to dissolve reactants and products; TFA (trifluoroacetic acid): used as a catalyst or to adjust the pH of a solution; Precursor biphenylthiophene: Precursor material for synthesizing graphene carbon nanoribbons, as a precursor in solution 3; Electrolyte tetrabutylammonium tetrafluoroborate: used to provide ionic conductivity during electrolysis; Medium DDQ: A catalytic oxidant used to oxidize the precursor material and convert it into graphene carbon nanoribbons.

[0030] When the mixed solution passes through the reaction channel, under the action of the electric field between the anode and the cathode, the precursor biphenylthiophene undergoes an oxidation reaction under the action of the oxidant DDQ. The result of the oxidation reaction is the formation of graphene carbon nanoribbons, which are formed in the solution or deposited on the electrode surface. The flow synthesis process can provide more uniform reaction conditions, which helps to improve the quality and yield of the product. Using fluorinated ethylene propylene foil as a separator can prevent direct contact between the anode and the cathode and reduce the occurrence of side reactions. The size and morphology of the graphene carbon nanoribbons can be adjusted by controlling the voltage and electrolyte concentration.

[0031] Furthermore, a constant voltage of 1.5-2V is applied between the anode and the cathode.

[0032] Furthermore, after the reaction is completed, the organic phase is removed by extraction with water and dichloromethane, and the remaining solution is concentrated in vacuo and purified by silica gel column chromatography.

[0033] Furthermore, the volume ratio of DCM: TFA is 250~300: 30 mL, the precursor biphenylthiophene is 180~220 mg, 300~350 μmol, 1.0 equivalent, and the electrolyte tetrabutylammonium tetrafluoroborate is 35~45 mmol.

[0034] Specifically, the volume ratio of DCM: TFA is 270: 30 mL, the precursor biphenylthiophene is 200 mg, 326 μmol, 1.0 equivalent, and the electrolyte tetrabutylammonium tetrafluoroborate is 40 mmol.

[0035] This embodiment uses the redox reaction between the flowing electrodes to realize the chemical reaction, and the reactants are continuously flowed in the electrochemical reaction cell to realize the conversion of the reactants through the electrochemical reaction. During the reaction process, the current passes through the electrodes in the electrochemical reaction cell, and the reactants are converted into products. As the flow continues, more and more products are prepared, thereby improving the reaction efficiency and the purity of the products.

[0036] Reaction principle Figure 1 shown.

[0037] The mixed solution in this example was heated at 0.1 mL min -1 The flow rate through the flow electrolyzer.

[0038] This embodiment uses a flow electrochemical method to prepare GNRs. On the one hand, this method avoids the rearrangement phenomenon in the traditional Scholl reaction and can prepare GNRs with a higher yield. On the other hand, the introduction of electron-rich sulfur has no effect on the reaction, achieving the effect of successful oxidation cyclization, which can not only be obtained with a higher yield but also can be prepared in large quantities. In addition, the synthesis method using flow electrochemistry does not require the addition of an equivalent oxidant, such as DDQ or ferric chloride, which is not achievable in the traditional Scholl reaction, realizing an efficient and green synthesis strategy.

[0039] refer to Figure 2-4 , which positively demonstrates that the method provided in this application can obtain GNRs, and also explains that the GNRs obtained in this application do not have other oxidation-sensitive functional groups and electron-rich heterocycles.

[0040] A flow synthesis device for graphene carbon nanoribbons, used to implement the flow synthesis process of graphene carbon nanoribbons, comprising: A frame 1, wherein the frame is provided with a platform 101; A positive electrode holder 2 and a negative electrode holder 3, wherein the positive electrode holder 2 is provided with a graphite plate 201, and the negative electrode holder 3 is provided with a nickel plate 301, and the positive electrode holder 2 is provided with a liquid inlet 202 and a liquid outlet 203; A controllable reaction barrier 4, the controllable reaction barrier 4 is composed of an upper and lower layer of fluorinated ethylene propylene foil, a reaction channel 401 is dug in the middle of the controllable reaction barrier 4, a gas is filled between the upper and lower layers of the fluorinated ethylene propylene foil, the controllable reaction barrier 4 is sandwiched between the positive electrode seat 2 and the negative electrode seat 3, and the liquid inlet 202 and the liquid outlet 203 are connected to the two ends of the reaction channel 401; A camera mechanism 5 is arranged at a position of the positive electrode seat or the negative electrode seat corresponding to the reaction channel; A pressurizing mechanism 6 is disposed above the platform 101. The pressurizing mechanism 6 changes the pressure on the positive electrode holder 2 so as to expand or contract the controllable reaction barrier 4 into the reaction channel 401, thereby reducing or increasing the cross-sectional area of ​​the reaction channel 401. In this embodiment, the controllable reaction barrier 4 is a three-dimensional structure, and a structure with a certain thickness is formed by filling gas between the upper and lower layers of the fluorinated ethylene propylene foil, and because the fluorinated ethylene propylene foil itself has a certain flexibility and elasticity, after being pressurized, the controllable reaction barrier 4 becomes flatter, and at the same time, the fluorinated ethylene propylene foil is flattened and expands toward the space of the reaction channel 401, thereby squeezing part of the space of the reaction channel 401. On the one hand, after the pressurization mechanism 6 is pressurized, the space between the positive electrode seat 2 and the negative electrode seat 3 becomes smaller, so that the height of the reaction channel 401 becomes smaller. On the other hand, after the pressurization mechanism 6 is pressurized, the controllable reaction barrier 4 becomes flatter but its volume remains unchanged, so that the width of the reaction channel 401 becomes smaller, thereby reducing the cross-sectional area of ​​the reaction channel 401; after the pressure of the pressurization mechanism 6 is reduced, the effect is opposite, so that the cross-sectional area of ​​the reaction channel 401 increases.

[0041] After the area of ​​the reaction channel 401 is reduced, if the flow rate of the liquid input into the reaction channel 401 remains unchanged, the flow rate of the liquid in the reaction channel 401 is accelerated, the reaction time of the liquid after passing through the reaction channel 401 is reduced, and the liquid reaction becomes less sufficient; after the area of ​​the reaction channel 401 is increased, if the flow rate of the liquid input into the reaction channel 401 remains unchanged, the flow rate of the liquid in the reaction channel 401 is slowed down, the reaction time of the liquid after passing through the reaction channel 401 is increased, and the liquid reaction becomes more sufficient. Under this effect, the electrolysis time of the mixed solution can be controlled, thereby controlling the reaction rate of the mixed solution. The reaction channel 401 is an S-shaped structure.

[0042] A control system (not shown) performs color analysis based on the image obtained by the camera mechanism 5, thereby controlling the pressure of the pressurizing mechanism 6; In this embodiment, at the beginning of the reaction, the mixed solution mainly contains DCM (dichloromethane), TFA (trifluoroacetic acid), precursor biphenylthiophene, electrolyte tetrabutylammonium tetrafluoroborate (tetrabutylammonium fluoride nitrate) and oxidant DDQ. Since DCM (dichloromethane), TFA (trifluoroacetic acid), precursor biphenylthiophene, electrolyte tetrabutylammonium tetrafluoroborate (tetrabutylammonium fluoride nitrate) are colorless liquids, a small amount of oxidant DDQ makes the mixed solution produce a light yellow color. With the start of the electrolysis process, the precursor biphenylthiophene begins to be oxidized under the action of the oxidant DDQ to generate carbon nanobelts. In this process, the color of the mixed solution will gradually deepen because the oxidation product has a dark color characteristic. Therefore, in this embodiment, the color of the mixed solution at the corresponding position in the reaction process is obtained by the camera mechanism 5, so as to judge the reaction degree of the mixed solution, and the reaction degree is fed back to the pressurizing mechanism 6 to control the pressure of the pressurizing mechanism 6 on the positive electrode holder 2, thereby controlling the electrolysis efficiency of the mixed solution between the two electrode holders.

[0043] A pump body 7 connected to the liquid inlet 202; A purification mechanism (not shown) is connected to the liquid outlet 203 .

[0044] In this embodiment, the pump body 7 is a syringe pump, and the purification mechanism is a silica gel column chromatography column (dichloromethane / hexane=1:20).

[0045] Furthermore, a locking hole is provided between the positive electrode holder 2 and the negative electrode holder 3, and the positive electrode holder 2 and the negative electrode holder 4 are locked by bolts 8. The bolts 8 can limit the maximum distance between the positive electrode holder 2 and the negative electrode holder 4, and at the same time clamp the positive electrode holder 2 and the negative electrode holder 4 to prevent the reaction mixture from leaking from the edge of the reaction channel 401.

[0046] Furthermore, the positive electrode holder 2 and the negative electrode holder 3 are provided with a plurality of springs 9, and the springs 9 enable the positive electrode holder 2 and the negative electrode holder 3 to have a tendency to move away from each other.

[0047] In this embodiment, the spring 9 allows the positive electrode holder 2 to move away from the cathode electrode holder 3 after the pressure of the pressurizing mechanism 6 decreases or disappears, so that the controllable reaction spacer 4 tends to return to its original shape.

[0048] Furthermore, the negative electrode seat 3 is provided with a groove body 302 , and the depth of the groove body 302 is less than the thickness of the controllable reaction barrier layer 4 .

[0049] In this embodiment, the controllable reaction spacer 4 is placed in the groove body 302. Through the depth setting, after the controllable reaction spacer 4 is placed in the groove body 302, the top of the controllable reaction spacer 4 exceeds the groove body 302, so that the positive electrode seat 2 can contact and apply pressure to it.

[0050] Furthermore, the control system performs color analysis based on the image obtained by the camera mechanism 5 to obtain the current color depth of the corresponding position of the reaction channel 401, and compares the current color depth with the preset color depth. If the current color depth is greater than the preset color depth, the pressure of the pressurizing mechanism 6 on the positive electrode seat 2 is increased; if the current color depth is less than the preset color depth, the pressure of the pressurizing mechanism 6 on the positive electrode seat 2 is reduced.

[0051] As mentioned above, during the reaction, the mixed liquid will change from light yellow to dark, and finally to orange or brown. Under the premise that the reaction channel 401 is an S-shaped structure, the mixed liquid passes a longer distance through the reaction channel 401. The mixed liquid will gradually change from light yellow to dark on the path of the reaction channel 401. The color change is a gradual process on the path, so the rate change in the reaction process can be judged according to the color change at a certain point, and in turn the pressure of the pressurizing mechanism 6 on the positive electrode seat 2 is controlled, so that the reaction rate of the mixed liquid in the reaction channel 401 tends to be the same, and the fineness of the final product will also be higher.

[0052] Furthermore, the pressurizing mechanism 6 is provided with a pressure sensor 601 .

[0053] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0054] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A flow synthesis process for graphene carbon nanoribbons, characterized in that: The following steps are involved: A graphite plate is used as an anode and a nickel plate is used as a cathode, and the anode and the cathode are separated by a fluorinated ethylene propylene foil, wherein the fluorinated ethylene propylene foil is provided with a reaction channel; A constant voltage is applied between the anode and the cathode, DCM, TFA, a precursor biphenylthiophene, an electrolyte tetrabutylammonium tetrafluoroborate and a medium DDQ are mixed to form a mixed solution, and the mixed solution is electrolyzed through the reaction channel; After the reaction is completed, the organic phase is removed, and the remaining solution is concentrated and purified to obtain a white powdery solid.

2. The flow synthesis process of graphene carbon nanoribbons according to claim 1, characterized in that: A constant voltage of 1.5-2V is applied between the anode and the cathode.

3. The flow synthesis process of graphene carbon nanoribbons according to claim 1, characterized in that: After the reaction was completed, the organic phase was removed by extraction with water and dichloromethane, and the remaining solution was concentrated in vacuo and purified by silica gel column chromatography.

4. The flow synthesis process of graphene carbon nanoribbons according to claim 1, characterized in that: The volume ratio of DCM: TFA is 250~300: 30 mL, the precursor biphenylthiophene is 180~220 mg, 300~350 μmol, 1.0 equivalent, and the electrolyte tetrabutylammonium tetrafluoroborate is 35~45 mmol.

5. A flow synthesis device for graphene carbon nanoribbons, characterized in that: A flow synthesis process for realizing a graphene carbon nanoribbon as described in claims 1 to 4, comprising: A frame, wherein the frame is provided with a platform; A positive electrode seat and a negative electrode seat, wherein the positive electrode seat is provided with a graphite plate, the negative electrode seat is provided with a nickel plate, and the positive electrode seat is provided with a liquid inlet and a liquid outlet; A controllable reaction spacer, the controllable reaction spacer is composed of an upper and lower layer of fluorinated ethylene propylene foil, a reaction channel is dug in the middle of the controllable reaction spacer, a gas is filled between the upper and lower layers of the fluorinated ethylene propylene foil, the controllable reaction spacer is sandwiched between the positive electrode seat and the negative electrode seat, and the liquid inlet and the liquid outlet are connected to the two ends of the reaction channel; A camera mechanism is arranged at a position of the positive electrode seat or the negative electrode seat corresponding to the reaction channel; A pressurizing mechanism is disposed above the platform, and the pressurizing mechanism changes the pressure on the positive electrode seat so as to expand or contract the controllable reaction barrier into the reaction channel, thereby reducing or increasing the cross-sectional area of ​​the reaction channel; A control system that performs color analysis based on the image obtained by the camera mechanism to control the pressure of the pressurizing mechanism; A pump body connected to the liquid inlet; A purification mechanism is connected to the liquid outlet.

6. The flow synthesis device for graphene carbon nanoribbons according to claim 5, characterized in that: A locking hole is arranged between the positive electrode seat and the negative electrode seat, and the positive electrode seat and the negative electrode seat are locked by bolts.

7. The flow synthesis device for graphene carbon nanoribbons according to claim 6, characterized in that: The positive electrode seat and the negative electrode seat are provided with a plurality of springs, and the springs make the positive electrode seat and the negative electrode seat have a tendency to move away from each other.

8. The graphene carbon nanoribbon flow synthesis device according to claim 5, characterized in that: The negative electrode seat is provided with a groove body, and the depth of the groove body is less than the thickness of the controllable reaction barrier layer.

9. The graphene carbon nanoribbon flow synthesis device according to claim 5, characterized in that: The control system performs color analysis based on the image obtained by the camera mechanism to obtain the current color depth of the corresponding position of the reaction channel, and compares the current color depth with the preset color depth. If the current color depth is greater than the preset color depth, the pressure of the pressurizing mechanism on the positive electrode seat is increased; if the current color depth is less than the preset color depth, the pressure of the pressurizing mechanism on the positive electrode seat is reduced.

10. The graphene carbon nanoribbon flow synthesis device according to claim 5, characterized in that: The pressurizing mechanism is provided with a pressure sensor.

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