Preparation method of antenna material and tag antenna

Abstract

The invention provides a preparation method of an antenna material and a tag antenna, and the preparation method comprises the steps: mixing a slurry of a two-dimensional transition metal carbide (nitride) material (MXene) with a graphene oxide solution to obtain a mixed slurry, mixing a polyenol compound solution with the mixed slurry to obtain a preset composite liquid, and carrying out the preparation of the preset composite liquid, and transferring the preset composite liquid to a substrate to obtain the composite membrane of the target material.

Description

Technical Field

[0001] The present application relates to the technical field of antenna materials, and in particular to a method for preparing antenna materials and a tag antenna. Background Art

[0002] In the field of RFID (radio frequency identification) technology, antennas are key components whose performance directly affects the recognition distance, reading rate and stability of RFID systems. Traditionally, RFID antennas are mostly made of metal-based materials, which have a place in the market due to their good electrical conductivity. However, in the face of the trend of technological iteration and diversified application needs, the limitations of antennas made of metal-based materials have begun to emerge.

[0003] Therefore, in actual use, there are still many problems with antenna materials that need to be improved, including but not limited to insufficient durability in certain extreme environments, poor adaptability to complex electromagnetic environments, and difficulty in meeting the needs of longer distance and higher sensitivity recognition. Summary of the invention

[0004] This application is made in view of the above-mentioned problems, and its purpose is to provide a method for preparing antenna materials, which uses two-dimensional transition metal carbon (nitride) materials (MXene) as raw materials, and by adding appropriate components, the target material obtained can improve environmental stability while not reducing its conductivity, and can obtain antenna materials with various properties that meet the use requirements, can reduce environmental pollution while meeting the use requirements, and can effectively improve environmental stability and service life. At the same time, the preparation method adopted also has the advantage of being environmentally friendly and green. This application also provides a tag antenna.

[0005] In order to achieve the above-mentioned object, the first aspect of the present application provides a method for preparing an antenna material, comprising: mixing a slurry of a two-dimensional transition metal carbon (nitride) material (MXene) with a graphene oxide solution to obtain a mixed slurry;

[0006] The polyenol compound solution is mixed with the mixed slurry to obtain a predetermined composite liquid,

[0007] The predetermined composite liquid is transferred to a substrate to obtain a composite film of a target material.

[0008] The preparation method of the antenna material provided in the present application uses a two-dimensional transition metal carbon (nitride) material (MXene) as a raw material to avoid the metal pollution caused by using a metal material as an antenna material. At the same time, in the present application, the introduction of graphene oxide helps to improve the conductivity of the antenna material finally obtained, balances the decrease in conductivity caused by the addition of polyenol compounds, and can prevent the oxidation of the target material finally obtained in the environment. At the same time, the addition of polyenol compounds can effectively reduce the situation in which the environmental stability of the material deteriorates after the target material finally obtained comes into contact with substances in the environment.

[0009] In any embodiment, the polyenol compound includes at least polyvinyl alcohol (PVA).

[0010] It can be understood that since the two-dimensional transition metal carbon (nitride) material (MXene) replaces the metal material as the antenna material, the tag antenna obtained based on the antenna material can reduce metal pollution while meeting the use requirements, and improve environmental stability and service life. At the same time, when the polyenol compound includes polyvinyl alcohol, since the polyvinyl alcohol can exist in a surrounding state around the adjacent two-dimensional transition metal carbon (nitride) material (MXene), this situation makes the two-dimensional transition metal carbon (nitride) material (MXene) in the obtained target material in the use environment. It can prevent it from being directly exposed to harmful substances in the environment (such as water-containing, oxygen-containing, etc. substances that affect environmental stability), thereby effectively improving environmental stability and service life. It should be noted that the content about polyvinyl alcohol increasing the environmental stability and service life of the target material can be understood as a possible theoretical explanation, but it should be understood that the present application is not limited to this specific theoretical explanation.

[0011] In any embodiment, the mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound ranges from (84% to 93%): (4% to 11%): (2% to 5%); optionally, the mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound ranges from (86% to 91%): (6% to 9%): (3% to 5%).

[0012] It can be understood that when the weight proportions of the two-dimensional transition metal carbon (nitride) material (MXene), graphene oxide and polyvinyl alcohol are controlled within the above range, it can help the performance of the final antenna material, such as conductivity and stability in the environment during use, to meet the use requirements.

[0013] In any embodiment, a two-dimensional transition metal carbon (nitride) material (MXene) slurry is mixed with a graphene oxide solution to obtain a mixed slurry, comprising:

[0014] Stirring and mixing a slurry comprising a graphene oxide solution and a two-dimensional transition metal carbon (nitride) material (MXene);

[0015] And / or, the mixed slurry is obtained by stirring, and the stirring time ranges from 12h to 16h.

[0016] It can be understood that when the stirring time is controlled within the above numerical range, it is helpful to fully mix the two-dimensional transition metal carbon (nitride) material (MXene) and graphene oxide to obtain a uniformly mixed slurry.

[0017] In any embodiment, the polyenol compound solution is mixed with the mixed slurry to obtain a predetermined composite solution, comprising:

[0018] Adding the polyenol compound solution into the mixed slurry and stirring and mixing;

[0019] and / or,

[0020] The preset composite liquid is obtained by stirring, and the stirring time ranges from 12h to 16h.

[0021] Here, after the two-dimensional transition metal carbon (nitride) material (MXene) and graphene oxide (GO solution) are mixed, the polyenol compound is added, so that the target material finally obtained can obtain improved environmental stability while not causing the conductive properties of the target material finally obtained to be unsatisfactory due to the addition of the polyenol compound earlier than the graphene oxide. At the same time, by adding polyvinyl alcohol to the mixed slurry obtained in the aforementioned process, the contact of the antenna material finally obtained with oxygen or a humid environment can be effectively reduced, which helps to improve the environmental stability of the antenna material finally obtained. In addition, by controlling the stirring time within the above numerical range, it helps to fully mix the two-dimensional transition metal carbon (nitride) material (MXene), graphene oxide and polyvinyl alcohol to obtain a uniformly mixed preset composite liquid, which provides a good prerequisite for the antenna material finally obtained to have good conductivity and environmental stability.

[0022] In any embodiment, transferring the predetermined composite liquid to a substrate to obtain a composite film of a target material comprises:

[0023] Applying the preset composite liquid onto the substrate by a doctor blade coating method;

[0024] The substrate coated with the preset composite liquid is dried to obtain a composite film of the target material.

[0025] It is understandable that the scraping method is a technique suitable for large-scale preparation, which helps to improve production efficiency. In addition, after the predetermined composite liquid is coated on the substrate by the scraping method, a drying step is performed, which helps to volatilize the solvent in the predetermined composite liquid to obtain the composite film material of the desired target material.

[0026] In any embodiment, the predetermined composite liquid is coated on the substrate by a doctor blade coating method, comprising:

[0027] The scraper height was adjusted to 750-1000 μm, and the mixed slurry was evenly scraped on the substrate on a vacuum coating machine.

[0028] Here, controlling the height of the scraper and coating the preset composite liquid on the vacuum coating machine helps to obtain a uniform coating effect and a good film-forming effect, which is beneficial for obtaining a flat film material after the preparation process.

[0029] In any embodiment, drying the substrate coated with the preset composite liquid comprises:

[0030] The substrate coated with the preset composite liquid is placed at room temperature for natural drying, and the natural drying time ranges from 16 hours to 24 hours.

[0031] Here, natural drying at room temperature helps reduce production costs and also helps to smooth the film.

[0032] A second aspect of the present application further provides a tag antenna, which includes the antenna material described in any one of the above embodiments.

[0033] The tag antenna provided in the present application adopts the antenna material provided in the first aspect of the present application, has good conductivity, can meet the reading requirements during use, and also has good environmental stability, which helps to improve the service life.

[0034] In any embodiment, the tag antenna has a size ranging from 35 to 45 mm in the first direction and a size ranging from 15 to 25 mm in the second direction, and the first direction and the second direction are parallel to the plane of the tag antenna and intersect each other.

[0035] It can be understood that, compared with conventional technologies, the antenna material provided in the embodiment of the present disclosure has a smaller size, and through simulation of structural simulation, the structural parameters are optimized, so as to achieve the purpose of impedance matching with the RFID chip. While miniaturization, it also ensures that it can be effectively read, that is, it can also meet the reading requirements in a small size, and at the same time, it also has good environmental stability, which helps to meet the use requirements, reduce production costs, and increase service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a process flow chart of a process of coating the preset composite liquid onto the substrate using a doctor blade coating method according to one embodiment of the present application;

[0037] Figure 2 A scanning electron microscope photograph of a composite film of the target material provided in an embodiment of the present disclosure;

[0038] Figure 3 A schematic diagram showing the relationship between the amount of PVA added and the conductivity of the target material provided in different embodiments of the present application;

[0039] Figure 4 A schematic diagram of the relationship between the reflection coefficient and the resonant frequency of a tag antenna made of antenna material is provided for an embodiment of the present application;

[0040] Figure 5 A schematic diagram of the change in reading distance of a tag antenna made of antenna material provided in an embodiment of the present application after being placed in a natural environment for 3 hours and immersed in ultrapure water for 3 hours;

[0041] Figure 6 The embodiment of the present application provides a schematic diagram of the change in reading distance of a tag antenna made of antenna material after being placed in a natural environment for 3 hours and immersed in hydrochloric acid for 3 hours;

[0042] Figure 7 A process flow chart of a method for preparing a tag antenna provided in one embodiment of the present application;

[0043] Figure 8 A schematic diagram of the structure of a tag antenna provided in one embodiment of the present application. DETAILED DESCRIPTION

[0044] Hereinafter, the method for preparing the antenna material and the implementation method of the tag antenna of the present application are described in detail with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the drawings and the following descriptions are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0045] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0046] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0047] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0048] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0049] If not specifically stated, the terms used in this application have the commonly known meanings generally understood by those skilled in the art.

[0050] If not otherwise specified, the values ​​of the parameters mentioned in this application can be measured using various test methods commonly used in the art, for example, they can be measured according to the test methods given in this application.

[0051] In the field of RFID (radio frequency identification) technology, antennas are key components whose performance directly affects the recognition distance, reading rate and stability of RFID systems. Traditionally, RFID antennas are mostly made of metal-based materials, which have a place in the market due to their good electrical conductivity. However, in the face of the trend of technological iteration and diversified application needs, the limitations of antennas made of metal-based materials have begun to emerge.

[0052] Therefore, in actual use, there are still many problems with antenna materials that need to be improved, such as insufficient durability in certain extreme environments, poor adaptability to complex electromagnetic environments, and difficulty in meeting the needs of longer distance and higher sensitivity recognition.

[0053] Based on this, the present application proposes a method for preparing an antenna material and a tag antenna, which are described in detail below with reference to the accompanying drawings.

[0054] Preparation method of antenna material

[0055] The present application proposes a method for preparing an antenna material, comprising: mixing a slurry of a two-dimensional transition metal carbon (nitride) material (MXene) with a graphene oxide solution to obtain a mixed slurry;

[0056] The polyenol compound solution is mixed with the mixed slurry to obtain a predetermined composite liquid,

[0057] The predetermined composite liquid is transferred to a substrate to obtain a composite film of a target material.

[0058] Compared with the traditional method of using metal materials as antenna materials, which easily causes metal pollution and has unsatisfactory durability and lifespan, the preparation method of the antenna material provided by the present application uses two-dimensional transition metal carbon (nitride) materials (MXene) as raw materials, and by adding graphene oxide and polyenol compounds, the obtained target material improves environmental stability while not reducing its conductive properties, and can obtain antenna materials with various properties that meet the use requirements, which can reduce environmental pollution while meeting the use requirements, and can effectively improve environmental stability and service life. At the same time, the preparation method adopted also has the advantages of being environmentally friendly and green.

[0059] The antenna material provided in the embodiment of the present application can be made into a tag antenna (RFID tag), which can be attached to a desired object, such as a chip, wafer, etc., and can be attached to a wafer box or carrier to record the identity, specifications, batch, and production process information of the chip, wafer, or carrier. In the semiconductor field, it can be used to realize wafer box tracking and management, quality control and tracing, and material distribution and inventory management functions.

[0060] In some embodiments, the graphene oxide solution is a graphene oxide nanosheet solution.

[0061] In some embodiments, the two-dimensional transition metal carbon (nitride) material (MXene) is an abbreviation of a two-dimensional transition metal carbide / nitride / carbonitride, which is obtained by etching away the middle "A" atomic layer from a layered matrix (MAX phase). A single-layer MXene has a two-dimensional planar structure, which enables the single-layer MXene to have an extremely high specific surface area and excellent conductivity.

[0062] It is understandable that in the process of preparing two-dimensional transition metal carbon (nitride) (MXene) materials, a part of bottom precipitates and reaction by-products will usually be obtained due to incomplete exfoliation, etc., which may include multilayer MXene, MAX phase residues and residual lithium salts, etc. The conductivity of the film prepared based on this part of the bottom precipitates and reaction by-products is low and insufficient to meet the use requirements of making RFID tag antennas.

[0063] Therefore, in the embodiments of the present application, the slurry of the two-dimensional transition metal carbon (nitride) (MXene) material used can be understood as a slurry made from the two-dimensional transition metal carbon (nitride) material normally obtained in the preparation process of the two-dimensional transition metal carbon (nitride) (MXene) material. This part of the normally obtained two-dimensional transition metal carbon (nitride) (MXene) material does not contain bottom sediments and reaction by-products and other materials that do not meet the performance requirements of the tag antenna. At the same time, since the two-dimensional transition metal carbon (nitride) material (MXene) therein uses a normally obtained two-dimensional transition metal carbon (nitride) (MXene) material, the tag antenna prepared based on the antenna material provided in the embodiments of the present application can have excellent electrical properties, thereby meeting the requirements for preparing the tag antenna.

[0064] In some embodiments, the polyenol compound includes at least polyvinyl alcohol.

[0065] But not limited thereto, in some possible embodiments, the polyenol compound may also include other enol compounds, such as polypropylene alcohol.

[0066] Here, the amount of the polyenol compound added should not be too much or too little. Too much can easily greatly reduce the conductivity of the antenna material obtained. Figure 3 It can also be seen in the figure that if the amount is too little, it will not improve the environmental stability of the antenna material finally obtained, so the amount of polyenol compound added should be controlled during preparation.

[0067] It can be understood that the introduction of graphene oxide helps to improve the conductivity of the antenna material finally obtained, balances the decrease in conductivity caused by the addition of polyenol compounds, and can prevent the oxidation of the target material finally obtained in the environment. At the same time, the addition of polyvinyl alcohol can effectively reduce the situation in which the environmental stability of the material is deteriorated after the target material finally obtained comes into contact with substances in the environment.

[0068] In addition, by introducing polyenol compounds, the preset composite liquid obtained by the preparation method provided in the embodiment of the present application can be scraped onto an ordinary PET substrate to form a film, and can be easily peeled off from the PET film after drying, without the need for an expensive diaphragm substrate. Thus, the preparation method of the antenna material provided in the embodiment of the present application helps to reduce production costs, is no longer limited by the size of the equipment, and can realize industrial production.

[0069] In some embodiments, the mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound ranges from (84% to 93%): (4% to 11%): (2% to 5%) (including the endpoint values); optionally, the mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound ranges from (86% to 91%): (6% to 9%): (3% to 5%) (including the endpoint values).

[0070] In some specific embodiments, the weight percentage of the two-dimensional transition metal carbon (nitride) material (MXene) is between 84% and 93% (including endpoints), for example, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, etc. The weight percentage of the graphene oxide is between 4% and 11% (including endpoints), for example, 5%, 6%, 7%, 8%, 9%, 10%, etc. The weight percentage of the polyenol compound is between 2% and 5% (including endpoints), for example, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.

[0071] Optionally, in some embodiments, the weight percentage of the two-dimensional transition metal carbon (nitride) material (MXene) is between 86% and 91%, the weight percentage of the graphene oxide is between 6% and 9%, and the weight percentage of the polyenol compound is between 3% and 5%.

[0072] In some embodiments, the weight ratio of the two-dimensional transition metal carbon (nitride) material (MXene), graphene oxide and polyenol compound can be: 86:9:5, 87:8:5, 88:7:5, 89:6:5, 87:9:4, 88:8:4, 89:7:4, 90:6:4, 88:9:3, 89:8:3, 90:7:3, 91:6:3, etc.

[0073] In some embodiments, the concentration range of the two-dimensional transition metal carbon (nitride) material (MXene) can be between 50-90 mg / mL (including endpoint values), for example, 55 mg / mL, 60 mg / mL, 65 mg / mL, 70 mg / mL, 75 mg / mL, 80 mg / mL, 85 mg / mL, etc., the concentration range of the graphene oxide (GO) solution can be between 5 and 20 mg / mL (including endpoint values), for example, 8 mg / mL, 10 mg / mL, 12 mg / mL, 14 mg / mL, 16 mg / mL, 18 mg / mL, etc., and the concentration range of the polyenol compound can be between 2 and 12 mg / mL (including endpoint values), 4 mg / mL, 6 mg / mL, 8 mg / mL, 10 mg / mL, etc.

[0074] Optionally, in some embodiments, the concentration range of the two-dimensional transition metal carbon (nitride) material (MXene) can be between 60-80 mg / mL (including the endpoint values), the concentration range of the graphene oxide (GO) solution can be between 8 and 12 mg / mL (including the endpoint values), for example, 10 mg / mL, and the concentration range of the polyenol compound can be between 6 and 10 mg / mL (including the endpoint values), for example, 8 mg / mL.

[0075] In some embodiments, after the three materials are mixed, the following operation may be performed: the slurry concentration may be controlled at 60 mg / mL by adding an appropriate amount of ultrapure water, so as to facilitate the subsequent film-forming process.

[0076] Figure 2 The scanning electron microscope photograph of the composite film of the target material provided in the embodiment of the present disclosure, the corresponding scale size is 10 μm, such as Figure 2As shown, when the weight ratio of the two-dimensional transition metal carbon (nitride) material (MXene), graphene oxide and polyenol compounds is controlled within the above range, the obtained composite film of the target two-dimensional transition metal carbon (nitride) material (MXene) has a relatively flat surface and good surface morphology, which helps to obtain a flexible and small RFID tag antenna that is low in cost, resistant to oxidation, and can be mass-produced based on the antenna material prepared in the embodiment of the present application.

[0077] In addition, if Figure 3 As shown in FIG. 1 , when the amount of the polyenol compound added is in a suitable range, such as 3% to 5%, the conductivity of the antenna material prepared can be greater than 1.1×10 5 The S / m level has excellent conductivity and meets the requirements for use as a tag antenna.

[0078] In some embodiments, a two-dimensional transition metal carbon (nitride) material (MXene) is mixed with graphene oxide (GO solution) to obtain a mixed slurry, comprising:

[0079] A slurry containing a graphene oxide (GO) solution and a two-dimensional transition metal carbon (nitride) material (MXene) is stirred and mixed to prepare a composite ink;

[0080] And / or, the mixed slurry is obtained by stirring, and the stirring time ranges from 12h to 16h (including endpoint values), for example, 12.5h, 13h, 13.5h, 14h, 14.5h, 15h, 15.5h, etc.

[0081] It can be understood that when the stirring time is controlled within the above numerical range, it is helpful to fully mix the two-dimensional transition metal carbon (nitride) material (MXene) and graphene oxide to obtain a uniformly mixed slurry.

[0082] In some embodiments, the polyenol compound is mixed with the mixed slurry to obtain a predetermined composite liquid, comprising:

[0083] Adding the polyenol compound solution into the mixed slurry and stirring and mixing;

[0084] and / or,

[0085] The preset composite liquid is obtained by stirring, and the stirring time ranges from 12h to 16h (including the endpoint values), for example, 12.5h, 13h, 13.5h, 14h, 14.5h, 15h, 15.5h, etc.

[0086] Here, after the two-dimensional transition metal carbon (nitride) material (MXene) is mixed with graphene oxide (GO solution), the polyenol compound is added, so that the target material finally obtained can obtain improved environmental stability while not causing the conductive properties of the target material finally obtained to be unsatisfactory due to the addition of the polyenol compound earlier than the graphene oxide. By adding polyvinyl alcohol to the mixed slurry obtained by the aforementioned process, the contact of the antenna material finally obtained with oxygen or a humid environment can be effectively reduced, which helps to improve the environmental stability of the antenna material finally obtained. In addition, by controlling the stirring time within the above numerical range, it helps to fully mix the two-dimensional transition metal carbon (nitride) material (MXene), graphene oxide and polyvinyl alcohol to obtain a uniformly mixed preset composite liquid, which provides a good prerequisite for the antenna material finally obtained to have good conductivity and environmental stability.

[0087] In some embodiments, Figure 1 As shown, the preset composite liquid 30 is transferred to the substrate 10 to obtain a composite film 11 of the target material, including:

[0088] The predetermined composite liquid 30 is coated on the substrate 10 by a doctor blade coating method;

[0089] The substrate 10 coated with the preset composite liquid 30 is dried to obtain a composite film 11 of the target material.

[0090] In some specific embodiments, the material of the substrate 10 may include PET (polyethylene terephthalate) material.

[0091] It can be understood that, as mentioned above, due to the introduction of the polyenol compound in the preset composite liquid 30 obtained by the preparation method provided in the embodiment of the present application, the preset composite liquid 30 can be scraped into a film on an ordinary PET substrate, and can be easily peeled off from the PET film after drying, and an expensive diaphragm substrate is no longer required. In this way, the preparation method of the antenna material provided in the embodiment of the present application helps to reduce production costs, is no longer limited by the equipment size, and can realize industrial production.

[0092] In some embodiments, the predetermined composite liquid is coated 30 onto the substrate 10 by a scraping method, comprising:

[0093] The height of the scraper 20 is adjusted to 750-1000 μm (including the end point value), and the predetermined composite liquid 30 is evenly scraped and coated on the substrate 10 on a vacuum coating machine.

[0094] In some embodiments, the height of the scraper 20 is adjusted to 750-1000 μm (including endpoints), for example, 780 μm, 800 μm, 820 μm, 850 μm, 880 μm, 900 μm, 920 μm, 950 μm, 980 μm, etc.

[0095] Here, controlling the height of the scraper 20 and coating the preset composite liquid on the vacuum coating machine helps to obtain a uniform coating effect and a good film-forming effect, and in a vacuum coating environment, reduces the possibility of impurities falling on the final target material.

[0096] In some embodiments, the substrate 10 coated with the preset composite liquid 30 is dried, comprising:

[0097] The substrate 10 coated with the preset composite liquid 30 is placed at room temperature for natural drying, and the natural drying time ranges from 16 hours to 24 hours.

[0098] In some embodiments, the natural drying time ranges from 16 h to 24 h (including endpoint values), for example, 16.5 h, 17 h, 17.5 h, 18 h, 18.5 h, 19 h, 19.5 h, 20 h, 20.5 h, 21 h, 21.5 h, 22 h, 22.5 h, 23 h, 23.5 h, etc.

[0099] Here, natural drying at room temperature helps reduce production costs and also helps to smooth the film.

[0100] refer to Figure 4 It can be seen that the resonant frequency of the tag antenna made based on the antenna material provided by the preparation method of the present application is around 920 MHz, and the reflection coefficient reaches the lowest point at this frequency point, indicating that the antenna and the chip are well conjugate matched at this frequency point, which meets the use requirements.

[0101] At the same time, from Figure 5 and Figure 6 It can be seen that the tag antenna made based on the antenna material provided by the preparation method of the present application still has good reading performance after being immersed in ultrapure water or hydrochloric acid (HCl) for 3 hours. Referring to the above figures, it can be seen that there is almost no difference in the reading performance of the tag antenna after being immersed in ultrapure water or hydrochloric acid (HCl) for 3 hours and the reading performance of the tag antenna placed in a natural environment for 3 hours. Therefore, it has good environmental stability and can obtain a longer service life.

[0102] From the above, it can be seen that the MXene composite film, that is, the antenna material, can be obtained through the embodiments of the present disclosure. The antenna material has excellent conductivity and is fully capable of replacing traditional metals. It can effectively avoid metal contamination and effectively prevent the following situations caused by metal tags:

[0103] Metal tags are easily oxidized and corroded, and have relatively poor durability and bendability, which restricts the widespread application of metal tags. Especially in extreme environments such as humidity, acid and alkali, these problems are significantly magnified, seriously affecting the service life and performance stability of the tag. At the same time, the antenna material obtained by the embodiment of the present disclosure also has a good surface morphology, meets the requirements for making tag antennas and has good environmental stability, so that it can have a longer service life.

[0104] An embodiment of the present disclosure further provides a tag antenna, which includes the antenna material described in any of the above embodiments.

[0105] The tag antenna provided in the embodiment of the present application can be applied to the field of RFID tag technology. Since it is attached to the required object, such as a chip, wafer, etc., it can be attached to a wafer box or carrier to record the identity, specification, batch, and production process information of the chip, wafer, or carrier. In the semiconductor field, it can be used to realize wafer box tracking and management, quality control and tracing, and material distribution and inventory management functions.

[0106] like Figure 7 As shown, in some embodiments, a method for preparing a tag antenna includes:

[0107] Placing a roll L of antenna material prepared in any one of the above embodiments on a production device;

[0108] Performing a cutting process on the roll material L to divide the roll material into initial labels A0 of a preset size;

[0109] The initial label A0 is pasted with the preset material 40 to obtain the label antenna A.

[0110] In some specific embodiments, the above preparation method is as follows:

[0111] First, the MXene composite film-PET roll L is placed at the unloading end 1, and the MXene composite film-PET material is tightened by a rubber roller to ensure that the material remains flat throughout the entire conveyor line.

[0112] Then, the MXene composite film-PET is transferred to the circular knife mold for patterned cutting, and the cutting depth of the circular knife is strictly controlled to ensure that only the MXene composite film is cut without cutting the PET roll film.

[0113] Next, the waste MXene composite film cut by the circular knife grinder is collected through the receiving end 1, and the PET film with the antenna is continuously conveyed to the rubber roller 2.

[0114] Next, before being transferred to the rubber roller 2, the anti-interference shielding sticker 41 of the unloading end 2 is attached to the PET with the antenna.

[0115] Then, after the shielding sticker 41 is adhered to the antenna, the PET is peeled off and collected at the receiving end 2.

[0116] Next, the adhesive roller 3 drives the sticker with the antenna to continue to be transferred to the chip 42 pasting unit, and is completed by the RFID electronic tag automatic labeling machine.

[0117] Next, after the chip is attached, a release paper 43 is attached to the bottom layer of the sticker through the blanking end 3 to protect the antenna and the chip.

[0118] Finally, the RFID tag antenna A is compacted by a rubber roller and transported to the collection end and collected into a roll.

[0119] In some embodiments, Figure 8 The size of the tag antenna A in the first direction ranges from 35 to 45 mm, and the size in the second direction ranges from 15 to 25 mm. The first direction and the second direction are parallel to the plane of the tag antenna and intersect each other.

[0120] like Figure 4 As shown, the obtained tag antenna is simulated, including: optimizing its structural parameters through structural simulation to achieve impedance matching with the RFID chip. It is miniaturized while ensuring that it can be effectively read. The simulated complex impedance of the antenna and its corresponding conjugate complex impedance value of the chip are input into the simulation module for calculation. This calculation process reflects the importance of impedance matching in antenna design and ensures the maximum transmission efficiency of the signal.

[0121] like Figure 4 As shown in the figure, it can be seen that the resonant frequency of the antenna is 920MHz, and the reflection coefficient reaches the lowest point at this frequency, indicating that the antenna and the chip are well conjugate matched at this frequency.

[0122] It can be seen that compared with conventional technologies, when the antenna material provided in the embodiment of the present disclosure has a smaller size, through simulation, the resonant frequency of the tag antenna obtained is also within the range that meets the use requirements. In other words, even when the tag antenna is small in size, it can meet the reading requirements.

[0123] At the same time, the miniaturized RFID tag antenna provided in the embodiment of the present application can exhibit excellent environmental stability in both pure water environment and acidic environment. Therefore, the industrialization of RFID tags can be realized. Compared with the conventional technology of using metal materials as tag antennas, the cost can be reduced by about 50%.

[0124] Example

[0125] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained commercially.

[0126] Example

[0127] Preparation of antenna materials:

[0128] Step S1: 10 mg / mL of graphene oxide (GO) solution is mixed with 60-80 mg / mL of MXene (two-dimensional transition metal carbon (nitride)) slurry. Optionally, ultrapure water can be added in an appropriate amount to control the slurry concentration to 60 mg / mL, and stirred for 12-16 hours to obtain a uniform slurry.

[0129] Step S2: Then, 8 mg / mL of polyvinyl alcohol (PVA) solution is added to the above slurry and stirred for 12-16 hours to prepare a composite ink; wherein the mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound is 88:9:3.

[0130] Step S3: Adjust the scraper height to 750-1000 μm, and evenly scrape the MXene / GO / PVA slurry on the PET substrate on a vacuum coating machine, and dry it naturally at room temperature for 16-24 hours to obtain a smooth composite film of the target material.

[0131] Preparation of tag antenna (such as Figure 7 shown):

[0132] Step S1: Place the roll film of the antenna material (MXene composite film-PET) prepared in the above embodiment at the unloading end 1, and tighten the MXene composite film-PET material through a rubber roller to ensure that the material remains flat throughout the entire conveyor line.

[0133] Step S2: The MXene composite film-PET is transferred to a circular knife mold for patterned cutting, and the cutting depth of the circular knife is strictly controlled to ensure that only the MXene composite film is cut without cutting the PET roll film.

[0134] Step S3: The waste MXene composite film after cutting with a circular knife is collected through the receiving end 1, and the PET film with an antenna is continuously conveyed to the rubber roller 2.

[0135] Step S4: before being transferred to the rubber roller 2, the anti-interference shielding sticker of the unloading end 2 is attached to the PET with the antenna.

[0136] Step S5: After the sticker is attached to the antenna, the PET is peeled off and collected at the receiving end 2.

[0137] Step S6: The adhesive roller 3 drives the sticker with the antenna to continue to be transferred to the chip pasting unit, and is completed by the RFID electronic tag automatic labeling machine.

[0138] Step S7: After the chip is attached, release paper is attached to the bottom layer of the sticker through the blanking end 3 to protect the antenna and the chip.

[0139] Step S8: The RFID tag antenna is compacted by a rubber roller and transferred to a collection end, and the RFID tag antenna is collected into a roll. The obtained tag antenna has a relatively small size, ranging from 35 to 45 mm in the first direction and from 15 to 25 mm in the second direction.

[0140] Simulation:

[0141] Through CST (three-dimensional electromagnetic field simulation software) simulation of the structure, determine whether the resonant frequency and reflectivity of the RFID tag antenna meet the usage requirements.

[0142] Environmental stability test:

[0143] The tag antenna was placed in a natural environment, ultrapure water and hydrochloric acid (HCL, PH=1) environment respectively, and the change of the theoretical read range forward value was tested after 3 hours.

[0144] from Figure 4 It can be seen that the resonant frequency of the tag antenna made based on the antenna material provided in the embodiment of the present application is around 920 MHz, and the reflection coefficient reaches the lowest point at this frequency point, indicating that the antenna and the chip are well conjugate matched at this frequency point and meet the use requirements.

[0145] At the same time, from Figure 5 and Figure 6It can be seen that the reading performance of the tag antenna obtained in the embodiment is still good after being immersed in ultrapure water or hydrochloric acid (HCl) for 3 hours. Referring to the above figures, it can be seen that there is almost no difference in the reading performance of the tag antenna after being immersed in ultrapure water or hydrochloric acid (HCl) for 3 hours and the reading performance of the tag antenna placed in a natural environment for 3 hours. Therefore, it has good environmental stability and can obtain a longer service life.

[0146] From the above, it can be seen that the non-metallic antenna material obtained by the embodiment of the present disclosure has excellent conductivity and is fully qualified to replace traditional metals. It can effectively avoid metal pollution and effectively prevent the following situations caused by metal tags:

[0147] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for preparing an antenna material, characterized in that: The preparation method comprises: Mixing a slurry of a two-dimensional transition metal carbon (nitride) material (MXene) with a graphene oxide solution to obtain a mixed slurry; Mixing the polyenol compound solution with the mixed slurry to obtain a preset composite liquid; The predetermined composite liquid is transferred to a substrate to obtain a composite film of a target material.

2. The preparation method according to claim 1, characterized in that: The polyenol compound at least includes polyvinyl alcohol.

3. The preparation method according to claim 1 or 2, characterized in that: The mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound ranges from (84% to 93%): (4% to 11%): (2% to 5%); optionally, the mass ratio of the two-dimensional transition metal carbon (nitride) material (MXene), the graphene oxide and the polyenol compound ranges from (86% to 91%): (6% to 9%): (3% to 5%).

4. The preparation method according to any one of claims 1 to 3, characterized in that: A slurry of a two-dimensional transition metal carbon (nitride) material (MXene) is mixed with a graphene oxide solution to obtain a mixed slurry, comprising: Stirring and mixing a slurry comprising a graphene oxide solution and a two-dimensional transition metal carbon (nitride) material (MXene); And / or, the mixed slurry is obtained by stirring, and the stirring time ranges from 12h to 16h.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The polyenol compound solution is mixed with the mixed slurry to obtain a predetermined composite liquid, comprising: Adding the polyenol compound solution into the mixed slurry and stirring and mixing; and / or, The preset composite liquid is obtained by stirring, and the stirring time ranges from 12h to 16h.

6. The preparation method according to any one of claims 1 to 5, characterized in that: The method comprises transferring the predetermined composite liquid onto a substrate to obtain a composite film of a target material, comprising: Applying the preset composite liquid onto the substrate by a doctor blade coating method; The substrate coated with the preset composite liquid is dried to obtain a composite film of the target material.

7. The preparation method according to claim 6, characterized in that: The predetermined composite liquid is coated on the substrate by a doctor blade method, comprising: The scraper height is adjusted to 750-1000 μm, and the preset composite liquid is evenly scraped and coated on the substrate on a vacuum coating machine.

8. The preparation method according to claim 6, characterized in that: The substrate coated with the preset composite liquid is dried, comprising: The substrate coated with the preset composite liquid is placed at room temperature for natural drying, and the natural drying time ranges from 16 hours to 24 hours.

9. A tag antenna, characterized in that: The tag antenna comprises the antenna material according to any one of claims 1-8.

10. The tag antenna according to claim 9, characterized in that: The tag antenna has a size ranging from 35 to 45 mm in the first direction and a size ranging from 15 to 25 mm in the second direction. The first direction and the second direction are parallel to the plane of the tag antenna and intersect each other.

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