Graphene oxide / porous graphene oxide layered structure coating modified carbon fiber as well as preparation method and application thereof
By modifying carbon fiber with a porous graphene oxide layered structure coating, the problems of instability and agglomeration of the graphene oxide coating were solved, the interface strength and toughness of the composite material were improved, and high-performance carbon fiber reinforced resin-based composite materials were prepared.
Patent Information
- Application Number
- CN202510832766.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-09-12
AI Technical Summary
In existing carbon fiber surface modification, the graphene oxide coating is loosely stacked, unstable and easily agglomerated, resulting in interfacial stress concentration, which limits the interfacial strength and toughness of the composite material.
A preparation method for modified carbon fiber with porous graphene oxide layered structure coating is adopted. By mixing graphene oxide, porous graphene oxide and organic solvent, vacuum filtration is performed to form a dense stacked layered structure, thereby enhancing the interface bonding strength and toughness.
The interfacial bonding strength of the composite material was increased by 35.3% to 80.5% and the interfacial fracture toughness was increased by 50.5% to 206.7%, the problems of instability and agglomeration of the graphene oxide coating were solved, and the performance of the carbon fiber reinforced resin-based composite material was improved.
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Figure CN120625344A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of surface and interface modification applications of materials, and specifically relates to a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber, and a preparation method and application thereof. Background Art
[0002] Carbon fiber reinforced composites have been widely used in aerospace, transportation, sports and other fields due to their excellent properties such as high specific strength, low density and fatigue resistance. The mechanical properties of these composites are limited by the interface phase. However, the surface of carbon fiber is chemically inert and has poor wettability with the matrix, which makes the interface bonding of the composite weak and limits its high performance. Therefore, it is necessary to increase the surface activity of carbon fiber to improve the interface strength of carbon fiber reinforced resin-based composites in order to achieve mechanical interlocking, chemical bonding or fiber-matrix interface wettability. In addition, improving the interface strength of composite materials will sacrifice the interface toughness, which is not conducive to the long-term, safe and stable application of composite materials. Therefore, how to solve the problem of interface strength-toughness mutual exclusion has become a key issue that needs to be solved in the field of composite materials.
[0003] Graphene oxide, a key graphene derivative, is widely used in carbon fiber surface modification due to its unique chemical structure and rich surface functional groups. However, two challenges exist in this application: First, its large size and wrinkled structure result in loosely packed graphene coatings, which can lead to coating instability. Second, excessive graphene oxide can easily lead to agglomeration, which can cause interfacial stress concentration. Therefore, addressing these challenges in graphene oxide coatings is crucial for achieving high-quality application on carbon fiber surfaces. Summary of the Invention
[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber and its preparation method and application, which solves the problem of instability of the existing coating caused by loose stacking of the graphene coating and easy agglomeration causing interface stress concentration, while improving the interface bonding strength and fracture toughness of carbon fiber reinforced resin-based composite materials.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A method for preparing carbon fiber modified by a graphene oxide / porous graphene oxide layered structure coating comprises the following steps:
[0007] 1) mixing graphene oxide, 25% to 30% hydrogen peroxide, and deionized water in a mass ratio of 1: (450 to 900): (800 to 1600), mixing uniformly, and then refluxing. After cooling to room temperature, dialyzing, centrifuging, and freeze-drying are performed in sequence to obtain porous graphene oxide;
[0008] 2) uniformly mixing graphene oxide, porous graphene oxide, and an organic solvent in a mass ratio of 1:(0.3-1):(80-120) to obtain a graphene oxide / porous graphene oxide dispersion;
[0009] 3) immersing the carbon fiber tow in an acetone solution, condensing and refluxing, then washing with deionized water, and drying to obtain a desized carbon fiber tow;
[0010] 4) The desized carbon fiber tow obtained by the treatment in step 3) is evenly laid on the filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, and the desized carbon fiber tow is flipped 180°, and the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, and after drying, a graphene oxide / porous graphene oxide layered structure coated modified carbon fiber is obtained.
[0011] Furthermore, in step 1), the reflux temperature is 80-110° C., the reflux time is 3-10 h, the dialysis time is 4-6 days, and the water is replaced every 8-12 h during the dialysis period.
[0012] Furthermore, in step 1), the centrifugal speed is 6000 to 10000 rpm / min, the freezing temperature is -50 to -10°C, and the freezing time is 12 to 48 hours.
[0013] Furthermore, in the step 2), the graphene oxide, porous graphene oxide and organic solvent are uniformly mixed by ultrasonic dispersion, the ultrasonic dispersion temperature is 0 to 10° C., and the time is 30 to 120 min.
[0014] Furthermore, the organic solvent in step 2) is tetrahydrofuran, dimethylformamide, ethanol or dichloromethane.
[0015] Furthermore, in step 3), the condensation reflux temperature is 80-100° C., the drying time is 12-96 hours, the drying temperature is 60-80° C., and the drying time is 2-4 hours.
[0016] Furthermore, in the step 4), the volume of the graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = (3-4) mL: 1 cm.
[0017] Furthermore, in step 4), the drying temperature is 60-80° C. and the drying time is 2-4 hours.
[0018] The graphene oxide / porous graphene oxide layered structure coating modified carbon fiber obtained by the above preparation method has a surface uniformly covered with a dense stacked layered structure coating formed by intercalating graphene oxide with porous graphene oxide.
[0019] A composite material prepared by applying graphene oxide / porous graphene oxide layered structure coating modified carbon fiber is made from resin and graphene oxide / porous graphene oxide layered structure coating modified carbon fiber as raw materials.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] (1) The present invention is the first to achieve uniform and dense coating of graphene oxide coating on the surface of carbon fiber by taking advantage of the nanopores of porous graphene oxide to give it smaller size and more oxygen-containing functional groups. Based on the method of intercalating homologous porous graphene oxide with graphene oxide coating, a densely stacked layered structure is constructed on the surface of carbon fiber to simultaneously improve the interface strength and toughness of the composite material, thereby solving the problems of low content and looseness and instability of existing graphene oxide coatings. The modification method is simple and easy, the reaction conditions are mild, pollution-free, environmentally friendly and efficient.
[0022] (2) The densely stacked graphene oxide / porous graphene oxide layered structure coating of the present invention is conducive to enlarging the exposed area of graphene oxide, enhancing the transfer of load from the matrix to the fiber, and hindering the expansion and formation of internal cracks; secondly, the rich oxygen-containing functional groups of graphene oxide / porous graphene oxide are conducive to forming π~π * , covalent bonds and hydrogen bonds interface interactions; secondly, the rich nanopores of porous graphene oxide enhance the capillary wetting effect and improve the resin's wetting effect on the fiber; finally, the graphene oxide / porous graphene oxide layered structure repairs the fiber surface defects, thereby increasing the tensile strength of the carbon fiber and having a positive effect on the interfacial bonding strength.
[0023] (3) In the present invention, under the action of shear force, a large number of hydrogen bonds between porous graphene oxide and graphene oxide promote the slip of large-sized graphene oxide and the rearrangement of the coating. The hydrogen bonds are dynamically reversible, and their repeated breakage and recombination during the movement process will aggravate energy consumption; further, as the shear force increases, the separation of porous graphene oxide and graphene oxide will also consume energy.
[0024] (4) The modified carbon fiber reinforced epoxy resin prepared by the method of the present invention can simultaneously improve the interfacial bonding strength and interfacial fracture toughness of the composite material, with the interfacial bonding strength increased by 35.3% to 80.5% and the interfacial fracture toughness increased by 50.5% to 206.7%. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a surface morphology of the carbon fiber modified with the graphene oxide / porous graphene oxide layered structure coating prepared in Example 1 of the present invention.
[0026] Figure 2 This is a surface morphology of the carbon fiber modified with the graphene oxide / porous graphene oxide layered structure coating prepared in Example 2 of the present invention.
[0027] Figure 3 This is a surface morphology of the carbon fiber modified with the graphene oxide / porous graphene oxide layered structure coating prepared in Example 3 of the present invention.
[0028] Figure 4 This is a surface morphology of the carbon fiber modified with the graphene oxide / porous graphene oxide layered structure coating prepared in Example 4 of the present invention. DETAILED DESCRIPTION
[0029] The present invention is further described in detail below with reference to specific embodiments.
[0030] Example 1:
[0031] This embodiment provides a method for preparing carbon fibers modified with a graphene oxide / porous graphene oxide layered structure coating, which specifically comprises the following steps:
[0032] 1) Preparation of porous graphene oxide: Graphene oxide, 25% hydrogen peroxide, and deionized water were mixed at a mass ratio of 1:450:800 and refluxed in an oil bath at 110°C for 3 h. The mixture was cooled to room temperature and dialyzed for 4 days, with the oil bath replaced every 10 h. The porous graphene oxide was separated by centrifugation at 6000 rpm / min and freeze-dried at -30°C for 12 h to obtain the porous graphene oxide.
[0033] 2) preparing a graphene oxide / porous graphene oxide dispersion: ultrasonically dispersing graphene oxide, porous graphene oxide, and tetrahydrofuran in a mass ratio of 1:0.3:80 at 5° C. for 90 minutes to uniformly mix to obtain a graphene oxide / porous graphene oxide dispersion;
[0034] 3) Immersing the carbon fiber tow in an acetone solution at 100° C. and refluxing for 12 h, washing with deionized water, and drying in a drying oven at 80° C. for 2 h to obtain a desized carbon fiber tow;
[0035] 4) Modification of the carbon fiber surface with a graphene oxide / porous graphene oxide layered structure coating: The desized carbon fiber tow obtained in step 3) is evenly laid on a filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, where the volume of the graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 3 mL: 1 cm. After the desized carbon fiber tow is flipped 180°, the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, where the volume of the graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 3 mL: 1 cm. The mixture is dried at 80°C for 2 h to obtain a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating.
[0036] The surface morphology of a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating prepared in this embodiment is as follows: Figure 1 As shown, from Figure 1 It can be seen that the coating on the fiber surface is relatively evenly distributed, but there is a small amount of agglomeration in some areas. The modified carbon fiber epoxy composite prepared using this embodiment has an interfacial shear strength that is 35.3% higher than that of the desized carbon fiber epoxy composite, and an interfacial fracture toughness that is 50.5% higher.
[0037] Example 2:
[0038] This embodiment provides a method for preparing carbon fibers modified with a graphene oxide / porous graphene oxide layered structure coating, which specifically comprises the following steps:
[0039] 1) Preparation of porous graphene oxide: Graphene oxide, 27% hydrogen peroxide, and deionized water were mixed at a mass ratio of 1:562:1000 and refluxed in an oil bath at 100°C for 5 h. The mixture was cooled to room temperature and dialyzed for 5 days, with the oil bath replaced every 8 h. The porous graphene oxide was separated from the solution by centrifugation at 8000 rpm / min, and freeze-dried at -50°C for 24 h to obtain the porous graphene oxide.
[0040] 2) preparing a graphene oxide / porous graphene oxide dispersion: ultrasonically dispersing graphene oxide, porous graphene oxide, and dimethylformamide in a mass ratio of 1:0.7:100 at 0° C. for 120 min to uniformly mix to obtain a graphene oxide / porous graphene oxide dispersion;
[0041] 3) immersing the carbon fiber tow in an acetone solution at 80° C. and condensing and refluxing for 48 hours, washing it with deionized water, and drying it in a drying oven at 60° C. for 3 hours to obtain a desized carbon fiber tow;
[0042] 4) Modification of the carbon fiber surface with a graphene oxide / porous graphene oxide layered structure coating: The desized carbon fiber tow obtained in step 3) is evenly laid on a filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, the volume of the graphene oxide / porous graphene oxide dispersion: the filter membrane diameter = 3.15 mL: 1 cm. After the desized carbon fiber tow is flipped 180°, the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, the volume of the graphene oxide / porous graphene oxide dispersion: the filter membrane diameter = 3.15 mL: 1 cm, and dried at 60°C for 3 h to obtain a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating.
[0043] The surface morphology of a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating prepared in this embodiment is as follows: Figure 2 As shown, from Figure 2 The fiber surface coating exhibits an ordered and compact structure, with numerous, evenly distributed nodes beneath the graphene oxide coating. The modified carbon fiber epoxy composite prepared using this example exhibits an 80.5% increase in interfacial shear strength and a 206.7% increase in interfacial fracture toughness compared to the desized carbon fiber epoxy composite.
[0044] Example 3:
[0045] This embodiment provides a method for preparing carbon fibers modified with a graphene oxide / porous graphene oxide layered structure coating, which specifically comprises the following steps:
[0046] 1) Preparation of porous graphene oxide: Graphene oxide, 28% hydrogen peroxide, and deionized water were mixed in a mass ratio of 1:900:1600 and refluxed in an oil bath at 80°C for 10 h. The mixture was cooled to room temperature and dialyzed for 6 days, with the oil bath replaced every 12 h. The porous graphene oxide was separated from the solution by centrifugation at 10,000 rpm / min, and freeze-dried at -10°C for 48 h to obtain the porous graphene oxide.
[0047] 2) preparing a graphene oxide / porous graphene oxide dispersion: ultrasonically dispersing graphene oxide, porous graphene oxide, and ethanol in a mass ratio of 1:1:120 at 10° C. for 30 minutes to uniformly mix to obtain a graphene oxide / porous graphene oxide dispersion;
[0048] 3) immersing the carbon fiber tow in an acetone solution at 90° C. and refluxing for 24 hours, washing with deionized water, and drying in a drying oven at 70° C. for 4 hours to obtain a desized carbon fiber tow;
[0049] 4) Modification of the carbon fiber surface with graphene oxide / porous graphene oxide layered structure coating: the desized carbon fiber tow obtained in step 3) is evenly laid on the filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, the volume of graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 4 mL: 1 cm, and the desized carbon fiber tow is flipped 180°, and the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, the volume of graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 4 mL: 1 cm, and dried at 70°C for 4 h to obtain a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating.
[0050] The surface morphology of a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating prepared in this embodiment is as follows: Figure 3 As shown, from Figure 3 It can be seen that the fiber surface coating presents a uniform and compact structure. The modified carbon fiber epoxy composite prepared by this embodiment has an interfacial shear strength increased by 59.4% and an interfacial fracture toughness increased by 103.3% compared to the desized carbon fiber epoxy composite.
[0051] Example 4:
[0052] This embodiment provides a method for preparing carbon fibers modified with a graphene oxide / porous graphene oxide layered structure coating, which specifically comprises the following steps:
[0053] 1) Preparation of porous graphene oxide: Graphene oxide, 29% hydrogen peroxide, and deionized water were mixed at a mass ratio of 1:600:1200 and refluxed in an oil bath at 100°C for 5 h. After cooling to room temperature, the mixture was dialyzed for 5 days, with the oil bath replaced every 10 h. The porous graphene oxide was separated by centrifugation at 9000 rpm / min, and freeze-dried at -20°C for 24 h to obtain the porous graphene oxide.
[0054] 2) preparing a graphene oxide / porous graphene oxide dispersion: ultrasonically dispersing graphene oxide, porous graphene oxide, and dichloromethane in a mass ratio of 1:0.5:100 at 5° C. for 60 minutes to uniformly mix to obtain a graphene oxide / porous graphene oxide dispersion;
[0055] 3) immersing the carbon fiber tow in an acetone solution at 80° C. and refluxing for 36 hours, washing with deionized water, and drying in a drying oven at 60° C. for 4 hours to obtain a desized carbon fiber tow;
[0056] 4) Modification of the carbon fiber surface with graphene oxide / porous graphene oxide layered structure coating: The desized carbon fiber tow obtained in step 3) is evenly laid on the filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, the volume of graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 3.71 mL: 1 cm. After the desized carbon fiber tow is flipped 180°, the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, the volume of graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 3.71 mL: 1 cm, and dried at 60°C for 4 h to obtain a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating.
[0057] The surface morphology of a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating prepared in this embodiment is as follows: Figure 4 As shown, from Figure 4 It can be seen that the fiber surface coating presents a uniform and compact structure. The modified carbon fiber epoxy composite prepared by this embodiment has an interfacial shear strength increased by 71.9% and an interfacial fracture toughness increased by 159.3% compared to the desized carbon fiber epoxy composite.
[0058] Example 5:
[0059] This embodiment provides a method for preparing carbon fibers modified with a graphene oxide / porous graphene oxide layered structure coating, which specifically comprises the following steps:
[0060] 1) Preparation of porous graphene oxide: Graphene oxide, 30% hydrogen peroxide, and deionized water were mixed in a mass ratio of 1:720:1400 and refluxed in an oil bath at 90°C for 6 h. The mixture was cooled to room temperature and dialyzed for 6 days, with the oil bath replaced every 8 h. The porous graphene oxide was separated by centrifugation at 7000 rpm / min and freeze-dried at -40°C for 36 h to obtain the porous graphene oxide.
[0061] 2) preparing a graphene oxide / porous graphene oxide dispersion: ultrasonically dispersing graphene oxide, porous graphene oxide, and dichloromethane in a mass ratio of 1:0.4:90 at 8° C. for 100 minutes to uniformly mix to obtain a graphene oxide / porous graphene oxide dispersion;
[0062] 3) immersing the carbon fiber tow in an acetone solution at 95° C. and condensing and refluxing for 96 hours, washing it with deionized water, and drying it in a drying oven at 65° C. for 3 hours to obtain a desized carbon fiber tow;
[0063] 4) Modification of the carbon fiber surface with graphene oxide / porous graphene oxide layered structure coating: the desized carbon fiber tow obtained in step 3) is evenly laid on the filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, the volume of graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 4 mL: 1 cm, and the desized carbon fiber tow is flipped 180°, and the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, the volume of graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = 4 mL: 1 cm, and dried at 75°C for 3 h to obtain a carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating.
[0064] The graphene oxide / porous graphene oxide layered structure coating modified carbon fiber obtained by the above preparation method has a surface uniformly covered with a dense stacked layered structure coating formed by intercalating graphene oxide with porous graphene oxide.
[0065] A composite material prepared by applying graphene oxide / porous graphene oxide layered structure coating modified carbon fiber is made from resin and graphene oxide / porous graphene oxide layered structure coating modified carbon fiber as raw materials.
Claims
1. A method for preparing carbon fiber modified with a graphene oxide / porous graphene oxide layered structure coating, characterized in that: The steps include: 1) mixing graphene oxide, 25% to 30% hydrogen peroxide, and deionized water in a mass ratio of 1: (450 to 900): (800 to 1600), mixing uniformly, and then refluxing. After cooling to room temperature, dialyzing, centrifuging, and freeze-drying are performed in sequence to obtain porous graphene oxide; 2) uniformly mixing graphene oxide, porous graphene oxide, and an organic solvent in a mass ratio of 1:(0.3-1):(80-120) to obtain a graphene oxide / porous graphene oxide dispersion; 3) immersing the carbon fiber tow in an acetone solution, condensing and refluxing, then washing with deionized water, and drying to obtain a desized carbon fiber tow; 4) The desized carbon fiber tow obtained by the treatment in step 3) is evenly laid on the filter membrane, and the graphene oxide / porous graphene oxide dispersion is vacuum filtered to the surface of the desized carbon fiber tow, and the desized carbon fiber tow is flipped 180°, and the graphene oxide / porous graphene oxide dispersion is repeatedly vacuum filtered to the other surface of the desized carbon fiber tow, and after drying, a graphene oxide / porous graphene oxide layered structure coated modified carbon fiber is obtained.
2. The method for preparing a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 1, characterized in that: In the step 1), the reflux temperature is 80-110° C., the reflux time is 3-10 hours, the dialysis time is 4-6 days, and the water is replaced every 8-12 hours during the dialysis period.
3. The method for preparing a graphene oxide / porous graphene oxide layered structure modified carbon fiber according to claim 1, characterized in that: In the step 1), the centrifugal speed is 6000 to 10000 rpm / min, the freezing temperature is -50 to -10°C, and the freezing time is 12 to 48 hours.
4. The method for preparing a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 1, characterized in that: In the step 2), the graphene oxide, porous graphene oxide and organic solvent are uniformly mixed by ultrasonic dispersion, the ultrasonic dispersion temperature is 0 to 10° C., and the time is 30 to 120 minutes.
5. The method for preparing a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 1, characterized in that: The organic solvent in step 2) is tetrahydrofuran, dimethylformamide, ethanol or dichloromethane.
6. The method for preparing a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 1, characterized in that: In the step 3), the condensation reflux temperature is 80-100° C., the time is 12-96 hours, the drying temperature is 60-80° C., and the drying time is 2-4 hours.
7. The method for preparing a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 1, characterized in that: In the step 4), the volume of the graphene oxide / porous graphene oxide dispersion: the diameter of the filter membrane = (3-4) mL: 1 cm.
8. The method for preparing a graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 1, characterized in that: In step 4), the drying temperature is 60-80° C. and the drying time is 2-4 hours.
9. The carbon fiber modified by the graphene oxide / porous graphene oxide layered structure coating obtained by the preparation method according to any one of claims 1 to 8, characterized in that: The surface of the modified carbon fiber is evenly covered with a dense stacked layer structure coating formed by intercalating graphene oxide with porous graphene oxide.
10. A composite material prepared by applying the graphene oxide / porous graphene oxide layered structure coating modified carbon fiber according to claim 9, characterized in that: It is made of resin and graphene oxide / porous graphene oxide layered structure coating modified carbon fiber.