CN114590801A - Graphene RFID tag and preparation method and application thereof - Google Patents
Graphene RFID tag and preparation method and application thereof Download PDFInfo
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
Abstract
The invention discloses a graphene material and a preparation method thereof, which can be used for preparing conductive paste and an RFID antenna. The preparation method and the using process are both green and environment-friendly; and the prepared graphene has high dispersibility and stability, and is easy to disperse uniformly in a solvent and is stable to store. Meanwhile, the prepared graphene sheet has clear layers and excellent conductivity, and the conductivity of the dispersed graphene is basically not influenced. The graphene conductive paste and the multilayer ink direct-writing printing technology based on the graphene conductive paste are environment-friendly, and can also obviously assist in improving the conductivity of the graphene RFID tag antenna. Meanwhile, the adhesive has high adhesion, is not easy to fall off, has good toughness, is not easy to break, and prolongs the service life. And the production efficiency can be effectively improved, the cost is reduced and the time is saved in large-scale production.
Description
Technical Field
The invention belongs to the technical field of Radio Frequency Identification (RFID), and particularly relates to a graphene RFID tag and a preparation method and application thereof.
Background
The Internet of Things (Internet of Things, IoT) connects any object with the Internet according to an agreed protocol through information sensing equipment such as Radio Frequency Identification (RFID) and a positioning system to perform information exchange and communication, so as to realize intelligent identification, positioning, tracking, monitoring and management. Has been widely used in various independent fields such as retail, transportation, military and the like.
Radio Frequency Identification (RFID) technology is a technology for implementing intelligent target identification by performing bidirectional information transfer through spatial coupling using Radio Frequency (RF) waves. Due to the strong anti-interference capability and the long communication distance, the RFID can adapt to various complex application environments, improve the working efficiency and reduce the management cost, and is applied to various aspects including medical care, logistics, intelligent shopping, public safety and the like. The RFID technology can be used for reading and writing the information of the RFID label, so that the purposes of article identification and data exchange can be realized.
The RFID antenna is generally made of metal materials such as copper and aluminum, and the mechanical, chemical and thermal stability of the metal tag is poor, so that the tag is easy to damage in the practical application of the Internet of things, and electronic waste is generated. Therefore, it is extremely urgent to replace metals with environmentally friendly, highly conductive materials.
Disclosure of Invention
The invention aims to prepare a graphene material with high dispersibility and stability by adopting an environment-friendly method, and the slurry prepared from the graphene material can be printed into an RFID antenna by a multilayer ink direct writing technology to obtain the graphene RFID tag antenna with high conductivity.
The technical scheme adopted by the invention is as follows:
the first aspect of the invention provides a preparation method of a graphene material, which comprises the steps of calcining graphite oxide under nitrogen, adding a mixed solution of ethylene glycol and water, uniformly dispersing under ultrasonic and magnetic stirring, adding a mixed solution of NaOH and ethylene glycol to adjust the pH value to 10-12, sealing, carrying out microwave heating, carrying out magnetic stirring and cooling to room temperature, washing, filtering and drying to obtain the graphene material.
The preparation method of the graphite oxide comprises the following steps: mixing concentrated sulfuric acid and concentrated phosphoric acid, and soaking in ice water bath for cooling. And then mixing the natural crystalline flake graphite and potassium permanganate, pouring the mixture into mixed acid, stirring the mixture for reaction for about 2 hours, removing the ice bath, and carrying out water bath reaction for 25 to 35 minutes at the temperature of 42 to 48 ℃. And then moving into an ice bath again, dropwise adding deionized water while stirring, and then carrying out water bath stirring reaction at constant temperature of 42-48 ℃ for about 4 hours. And after the reaction is finished, adding a hydrogen peroxide solution, centrifuging, removing a supernatant, ultrasonically dispersing, dialyzing, and drying at 60-80 ℃ to obtain the flake graphite oxide.
Preferably, the concentrated sulfuric acid and the concentrated phosphoric acid are mixed in a volume ratio of 8: 1.
Preferably, the natural flake graphite and potassium permanganate are mixed in a 1:3 weight ratio.
Preferably, the amount of deionized water added to the mixed solution is equal to the volume of concentrated sulfuric acid.
Preferably, the hydrogen peroxide solution is used at a concentration of 3%.
Preferably, the ice bath is removed after stirring the reaction for about 2 hours and the reaction is carried out in a water bath at 45 ℃ for 30 minutes.
Preferably, the reaction is stirred in a constant temperature 45 ℃ water bath for about 4 hours.
Preferably, the drying is oven drying at 70 ℃.
According to the preparation method of the first aspect of the present invention, preferably, the calcination is performed under a condition of raising the temperature to 350 to 450 ℃ at a rate of 10 ℃ per minute.
More preferably, the calcination is carried out under conditions such that the temperature is raised to 400 ℃ at a rate of 10 ℃ per minute.
Preferably, the calcination time is 3.5-4.5 h.
More preferably, the calcination time is 4 h.
Preferably, the nitrogen calcination is carried out in a tube furnace.
According to the preparation method of the first aspect of the present invention, preferably, the ultrasonic condition is 10 to 20 min.
According to the preparation method of the first aspect of the present invention, preferably, the microwave heating is performed under 680 to 720 ℃ for about 2min, and the heating is repeated 3 times.
More preferably, the microwave heating is performed under 700 ℃ for about 2min, and the heating is repeated 3 times.
Preferably, the concentration of the mixed solution of NaOH and glycol is 0.5 mol/L.
Preferably, the washing is stirring washing with deionized water and absolute ethyl alcohol respectively.
In a second aspect of the present invention, there is provided a graphene material prepared by the method of the first aspect of the present invention.
In a third aspect of the present invention, a graphene conductive paste is provided, which is prepared from the graphene material according to the second aspect of the present invention.
The fourth aspect of the present invention provides a preparation method of the graphene conductive paste according to the third aspect of the present invention, wherein the graphene material according to the second aspect of the present invention is added into a solvent, and subjected to ultrasonic treatment, stirring, and uniform dispersion, so as to obtain the graphene conductive paste.
Preferably, the solvent is preferably at least one of N-methylpyrrolidone (NMP) and Dimethylformamide (DMF).
Preferably, the concentration of the graphene conductive paste is 10-50 mg/ml.
In a fifth aspect of the present invention, there is provided an application of the graphene material according to the second aspect of the present invention or the graphene conductive paste according to the third aspect of the present invention in preparing a conductive antenna material.
According to the sixth aspect of the invention, an RFID antenna is provided, and the graphene conductive paste according to the third aspect of the invention is prepared by direct-write printing of multiple layers of ink on an antenna substrate.
The antenna base body is selected from any one of PET, PVC, PP, PC, paperboard, offset paper, coated paper, glass paperboard, laser paper, kraft paper, fluorescent paper, aluminum foil paper or anti-counterfeiting paper.
Preferably, the concentration of the graphene conductive paste is 10-50 mg/ml.
More specifically, the specific preparation method of the RFID antenna comprises the steps of putting the graphene conductive paste into a syringe barrel, connecting the graphene conductive paste with a spray head, installing the graphene conductive paste on a three-axis CNC platform, opening an air pressure control system, fixing an antenna substrate on a heating plate, setting the moving speed and the moving route of the spray head by using a computer, setting the paste extrusion speed, opening the heating plate, and extruding the graphene conductive paste from the spray head through a spiral extrusion or pneumatic pressure control system and forming the graphene conductive paste on the substrate after the operation is started.
Furthermore, when the ink is used for direct-writing printing, the substrate is continuously heated, and the heating temperature is 80-100 ℃; the moving speed of the workbench is 5-8; the extrusion speed of the slurry is 40-100 mu L/min; the ink jet needle is any one of 19, 20 and 21; the number of layers of the RFID antenna is 3-10 layers during multilayer printing.
More preferably, the number of the ink direct-writing printing layers is 4-6.
And (3) printing continuous antenna lines with uniform thickness and good adhesion with the substrate on the substrate in multiple layers by adopting an ink direct writing technology. The direct-writing printing technology can accurately control the printing of complex circuit shapes, and has short working time and high efficiency. The proposed multilayer printing technique greatly improves the electrical conductivity of the lines.
In a seventh aspect of the invention, an RFID electronic tag is provided, which comprises the RFID antenna according to the sixth aspect of the invention.
The invention has the beneficial effects that:
the invention provides a graphene material and a preparation method thereof, which can be used for preparing conductive paste and an RFID antenna. The preparation method and the using process of the graphene provided by the invention are both green and environment-friendly, and are harmless to the environment and human health; and the prepared graphene has high dispersibility and stability, and is easy to disperse uniformly in a solvent and is stable to store. Meanwhile, the prepared graphene sheet has clear layers and excellent conductivity, and the conductivity of the dispersed graphene is basically not influenced.
The graphene conductive paste and the multilayer ink direct-writing printing technology based on the graphene conductive paste are environment-friendly, and can also obviously assist in improving the conductivity of the graphene RFID tag antenna. Meanwhile, the adhesive has high adhesion, is not easy to fall off, has good toughness, is not easy to break, and prolongs the service life. And in large-scale production, the production efficiency can be effectively improved, the cost is reduced, and the time is saved.
Typical manufacturing processes for RFID antennas include chemical etching and printed circuit boards, which are cumbersome and not environmentally friendly. The direct-writing technology is a forming technology which develops rapidly in recent years, can accurately control the complex printing of the antenna circuit, and has short working time, high efficiency and remarkable advantages. However, the direct writing parameters (pressure, speed) and the direct writing environment (temperature, direct writing medium) of the ink direct writing have great influence on the direct writing process, and the ink needs to be matched with proper direct writing parameters and the direct writing environment to construct a stable structure.
The invention also provides an RFID antenna and an RFID electronic tag comprising the RFID antenna. The cost of the RFID electronic tag can be reduced by researching and developing the graphene RFID, the manufacturing technology of the RFID electronic tag is improved, the cost performance of the graphene RFID electronic tag is improved on the whole, green and clean in the manufacturing and using processes are guaranteed, the cost is reduced economically, and an excellent process is realized in manufacturing.
Therefore, the RFID antenna conductive slurry is prepared by dispersing graphene in consideration of both green and environmental protection and performance. The application also provides a multilayer ink direct-writing printing technology based on the graphene conductive paste while providing a paste preparation scheme, the technology can be used for accurately controlling the complex printing of an antenna circuit, and the working time is short and the efficiency is high. The multilayer printing technology fully exerts the conductive advantages of graphene, improves the conductivity, is high in adhesion degree, not prone to falling off, good in toughness and not prone to breaking, prolongs the service life, is good in stability, and reduces the influence of environmental factors such as bending wrinkles on the resistance value of the graphene.
Drawings
Figure 1 complex antenna circuit printed physical diagram.
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments and accompanying drawings. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1 preparation of graphene conductive paste
1. Preparing graphene:
mixing concentrated sulfuric acid and concentrated phosphoric acid in the volume ratio of 8:1, and soaking in an ice water bath for cooling. Then, the natural crystalline flake graphite and the potassium permanganate are evenly mixed according to the weight ratio of 1:3 and then poured into mixed acid, the mixed acid is stirred for reaction for 2 hours, then the ice bath is removed, and the water bath reaction is carried out for 30 minutes at the temperature of 45 ℃. And then moving into an ice bath again, dropwise adding deionized water with the same volume as concentrated sulfuric acid while stirring, and after dropwise adding, stirring and reacting in a water bath at the constant temperature of 45 ℃ for 4 hours. After the reaction was complete, a 3% hydrogen peroxide solution was added until the liquid turned from tan to light yellow and no more gas was produced. And centrifuging, removing supernatant, adding deionized water with the same volume, performing ultrasonic dispersion, dialyzing, and drying in a 70 ℃ oven to obtain the flake graphite oxide.
Placing the ground graphite oxide into a quartz boat, placing the quartz boat in a tube furnace, heating the quartz boat to 400 ℃ at the rate of 10 ℃ per minute under the protection of nitrogen, maintaining the temperature for 4 hours, slowly cooling the quartz boat to room temperature to obtain incompletely stripped Expanded Graphite (EG), and storing the incompletely stripped Expanded Graphite (EG) in a drying box at 80 ℃ for later use. Weighing a certain amount of expanded graphite, adding a proper amount of mixed solution of ethylene glycol and water, uniformly dispersing the expanded graphite by ultrasonic and magnetic stirring, and adjusting the pH value to 11 by using 0.5 mol/L NaOH ethylene glycol solution in the process; after the system is sealed, the system is put into a microwave oven and heated for 2 minutes under the power of 700W, and the heating is repeated for three times. And (3) slowly cooling to room temperature by magnetic stirring, stirring and washing with deionized water and absolute ethyl alcohol respectively, carrying out suction filtration, and drying in an air drying oven at 80 ℃ to obtain a graphene sample for later use.
2. Preparation of graphene conductive paste
Mixing graphene and Dimethylformamide (DMF) according to a weight ratio of 1: 99. 1: 49. 1: 24. 1: 19, and performing ultrasonic treatment and stirring to obtain uniform graphene dispersion solutions of 10mg/ml, 20mg/ml, 40mg/ml and 50 mg/ml.
Example 2
Weighing 4g of 10mg/ml graphene dispersion liquid, putting the graphene dispersion liquid into a syringe cylinder, connecting with a spray head, installing the graphene dispersion liquid on a three-axis CNC platform, opening an air pressure control system, fixing a PET substrate on a heating plate, setting the moving speed of the spray head to be 5 by using a computer, setting a movement route of the spray head, simultaneously setting the extrusion speed of slurry to be 100 microliter per minute, opening the heating plate, setting the temperature of the heating plate to be 100 ℃, starting to operate after the temperature of the heating plate rises and is stabilized at 100 ℃, and extruding the graphene conductive slurry from the spray head through a spiral extrusion or pneumatic pressure control system and forming on the substrate.
The formed antenna line was placed in an ion sputter, sputtering time was set for 5 minutes, and the test conductivity was shown in table 1.
Example 3
Weighing 4g of 20mg/ml graphene dispersion liquid, putting the graphene dispersion liquid into a syringe cylinder, connecting with a spray head, installing the graphene dispersion liquid on a three-axis CNC platform, opening an air pressure control system, fixing a PP (polypropylene) substrate on a heating plate, setting the moving speed of the spray head to be 5 by using a computer, setting a movement route of the spray head, setting the extrusion speed of slurry to be 100 microliter per minute, opening the heating plate, setting the temperature of the heating plate to be 100 ℃, starting to run after the temperature of the heating plate rises and is stabilized at 100 ℃, and extruding the graphene conductive slurry from the spray head through a spiral extrusion or pneumatic pressure control system and forming on the substrate.
The formed antenna line was placed in an ion sputter, sputtering time was set for 5 minutes, and the test conductivity was shown in table 1.
Example 4
Weighing 4g of 40mg/ml graphene dispersion liquid, putting the graphene dispersion liquid into a syringe cylinder, connecting with a spray head, installing the graphene dispersion liquid on a three-axis CNC platform, opening an air pressure control system, fixing a coated paper substrate on a heating plate, setting the moving speed of the spray head to be 5 by using a computer, setting a movement route of the spray head, setting the extrusion speed of slurry to be 100 microliters per minute, opening the heating plate, setting the temperature of the heating plate to be 100 ℃, starting to operate after the temperature of the heating plate rises and is stabilized at 100 ℃, and extruding the graphene conductive slurry from the spray head through a spiral extrusion or pneumatic pressure control system and forming on the substrate.
The formed antenna line was placed in an ion sputter, sputtering time was set for 5 minutes, and the test conductivity was shown in table 1.
Example 5
Weighing 4g of 50mg/ml graphene dispersion liquid, putting the graphene dispersion liquid into a syringe barrel, connecting with a spray head, installing the graphene dispersion liquid on a three-axis CNC (computer numerical control) platform, opening a pneumatic control system, fixing a PET (polyethylene terephthalate) substrate on a heating plate, setting the movement speed of the spray head to be 5 by using a computer, setting the movement route of the spray head, setting the extrusion speed of slurry to be 100 microliter per minute, opening the heating plate, setting the temperature of the heating plate to be 100 ℃, starting to operate after the temperature of the heating plate is raised and stabilized at 100 ℃, and extruding the graphene conductive slurry from the spray head through a spiral extrusion or pneumatic pressure control system and forming on the substrate.
The formed antenna line was placed in an ion sputter, sputtering time was set for 5 minutes, and the test conductivity was shown in table 1.
Comparative example 1
Firstly, etching a graphite column on HOPG, pressing one surface of the graphite column on a glass sheet coated with wet photoresist with the thickness of 1 mu m, and baking to retain the graphite column on the photoresist. Repeatedly stripping the photoresist with transparent adhesive tape, dissolving the photoresist with propanol, and dissolving SiO2And after the/Si substrate is soaked in a propanol solution, washing the substrate by using a large amount of water and propanol, and drying to obtain the graphene sheet.
Mixing graphene and Dimethylformamide (DMF) according to a weight ratio of 1: 19, and performing ultrasonic treatment and stirring to obtain a uniform graphene dispersion liquid of 50 mg/ml.
Weighing 4g of 50mg/ml graphene dispersion liquid, putting the graphene dispersion liquid into a syringe cylinder, connecting with a spray head, installing the graphene dispersion liquid on a three-axis CNC platform, opening an air pressure control system, fixing a PET substrate on a heating plate, setting the moving speed of the spray head to be 5 by using a computer, setting a movement route of the spray head, simultaneously setting the extrusion speed of slurry to be 100 microliter per minute, opening the heating plate, setting the temperature of the heating plate to be 100 ℃, starting to operate after the temperature of the heating plate rises and is stabilized at 100 ℃, and extruding the graphene conductive slurry from the spray head through a spiral extrusion or pneumatic pressure control system and forming on the substrate.
The formed antenna line was placed in an ion sputter, sputtering time was set for 5 minutes, and the test conductivity was shown in table 1.
Table 1 examples 2 to 5 antenna conductivity test results
As can be seen from the results in table 1, the graphene preparation method significantly assists in improving the conductivity of the graphene RFID tag antenna.
Comparative example 2
Weighing 4g of 60mg/ml graphene dispersion liquid, putting the graphene dispersion liquid into a syringe cylinder, connecting with a spray head, installing the graphene dispersion liquid on a three-axis CNC platform, opening an air pressure control system, fixing a PET substrate on a heating plate, setting the moving speed of the spray head to be 5 by using a computer, setting a movement route of the spray head, setting the extrusion speed of the slurry to be 200 microliters per minute, opening the heating plate, setting the temperature of the heating plate to be 100 ℃, starting to operate after the temperature of the heating plate rises and is stabilized at 100 ℃, and extruding the graphene conductive slurry from the spray head through a spiral extrusion or pneumatic pressure control system and forming on the substrate.
The graphene dispersion liquid prepared by the method has high viscosity, is difficult to stir and disperse, has high extrusion difficulty in the direct writing process, and has large conductivity difference at each part of the line due to overlarge extrusion pressure requirement, uneven direct writing line, nonuniform line thickness and high line conductivity difference.
Example 6
The graphene conductive paste prepared in example 5 is extruded from a nozzle through a screw extrusion or pneumatic pressure control system and is molded on a substrate, and the printing is repeated for 1 to 6 times to obtain an antenna circuit.
The formed antenna line was placed in an ion sputter, sputtering time was set for 5 minutes, and the test conductivity was shown in table 2.
Table 2 influence of the number of repeated printing of graphene conductive paste on conductivity in example 5
As can be seen from the results in table 2, the conductivity improvement effect of the 6-layer direct-write is very small compared to the 5-layer direct-write. The effect of writing directly for more layers is close, the time cost is too high, and the efficiency is reduced, so that the optimal number of layers in multilayer printing is 5-6.
Example 7
The graphene conductive paste prepared in example 5 is extruded from a nozzle through a screw extrusion or pneumatic pressure control system and is molded on a substrate, the printing is repeated for 5 times to obtain an antenna line, the prepared antenna line is continuously bent and folded in half, and the conductivity and the adhesion force of the antenna line are tested, and the test results are shown in tables 3 and 4 below.
TABLE 3 test results of conductivity and adhesion after bending and folding the antenna at different angles for 100 times
TABLE 4 test results of conductivity and adhesion after 90-degree bending and folding of the antenna for different times
| Number of folds | 50 | 100 | 150 | 200 | 250 | 300 |
| Conductivity/omega | 0.12 | 0.17 | 0.15 | 0.28 | 0.34 | 0.3 |
| adhesion/N | 4.3 | 4.1 | 3.9 | 3.9 | 3.5 | 3.3 |
The results in tables 3 and 4 show that the prepared antenna line has high adhesion, is not easy to fall off, has good toughness, is not easy to break, has prolonged service life, has good stability, and reduces the influence of environmental factors such as bending wrinkles on the resistance value. A printed object diagram of the complex antenna circuit is shown in an attached figure 1.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. Calcining graphite oxide under nitrogen, adding a mixed solution of ethylene glycol and water, uniformly dispersing under ultrasonic and magnetic stirring, adding a mixed solution of NaOH and ethylene glycol to adjust the pH value to 10-12, sealing, carrying out microwave heating, cooling to room temperature through magnetic stirring, washing, filtering and drying to obtain the graphene material;
the calcining condition is calcining for 3.5-4.5 h at 350-450 ℃.
2. The preparation method according to claim 1, wherein the microwave heating is performed under 680-720 ℃ for 2min, and the heating is repeated 3 times.
3. The graphene material prepared by the preparation method of claim 1 or 2.
4. A graphene conductive paste prepared from the graphene material of claim 3.
5. The preparation method of the graphene conductive paste according to claim 4, wherein the graphene material according to claim 3 is added into a solvent, and subjected to ultrasonic treatment, stirring and uniform dispersion to obtain the graphene conductive paste;
the solvent is preferably at least one of N-methylpyrrolidone (NMP) and Dimethylformamide (DMF).
6. Use of the graphene material according to claim 3 or the graphene conductive paste according to claim 4 for preparing a conductive antenna material.
7. An RFID antenna, which is prepared by printing the graphene conductive paste according to claim 4 on an antenna substrate by a multilayer ink direct writing technology.
8. The RFID antenna of claim 7, wherein the heating temperature of the ink direct-write printing is 80-100 ℃; the graphene conductive paste according to claim 4, wherein the extrusion speed is 40-100 μ L/min.
9. The RFID antenna of claim 7, wherein the number of layers of ink direct write printing is 4-6.
10. An RFID electronic tag comprising an RFID antenna as claimed in any one of claims 7 to 9.
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