NFC label and preparation method thereof

Abstract

The invention belongs to the technical field of communication equipment, and discloses an NFC tag and a preparation method thereof. The NFC tag comprises a substrate and an NFC coil; the NFC coil is arranged on the substrate, and the material of the NFC coil comprises an MXene material. The invention provides an NFC label, which comprises a substrate and an NFC coil, the NFC coil is arranged on the substrate, and the material of the NFC coil comprises an MXene material. The high conductivity of the MXene can improve the sensitivity of the NFC tag, so that the NFC tag can respond to an external signal more quickly, meanwhile, the MXene has excellent conductivity, chemical stability and solution processability, the NFC tag is convenient to produce and manufacture, the MXene ink and the substrate have good adhesiveness, the precision and integrity of a coil pattern are improved, and the NFC tag can be used for manufacturing the NFC tag. Therefore, the performance and the consistency of the NFC tag are improved, and the NFC tag has good conductivity and flexibility, can be bent for use, and is suitable for various application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of communication equipment, and in particular to an NFC tag and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of radio frequency identification (RFID) technology, NFC tags have been widely used in the Internet of Things (IoT), smart homes, mobile payments, and other fields. Traditional NFC tag manufacturing processes typically use etching, electroplating, and copper wire winding, which pose challenges such as complex manufacturing processes, high costs, and environmentally unfriendly materials.

[0003] Researchers are exploring new NFC tag manufacturing processes. Printing technology, with its advantages of low cost, contactless operation, low raw material consumption, digitalization, and additive manufacturing, offers a new approach to NFC tag manufacturing. However, existing printing technologies place high demands on the performance of conductive inks. For example, viscosity and surface tension must be within appropriate ranges to ensure stable and accurate printing. Furthermore, the ink's adhesion to the substrate can affect the accuracy and integrity of the printed pattern. Existing printing inks often have poor overall performance, making them inconvenient to use. Summary of the Invention

[0004] The main purpose of the present invention is to provide an NFC tag and a preparation method thereof, aiming to solve the problem that existing printing inks often have poor overall performance.

[0005] To achieve the above object, the present invention provides an NFC tag, comprising:

[0006] substrate; and,

[0007] An NFC coil is provided on the substrate, and the material of the NFC coil includes MXene material.

[0008] In one embodiment, the substrate is a flexible substrate.

[0009] In one embodiment, the flexible substrate includes any one of photo paper, cotton textile fabric, and polyester textile fabric.

[0010] In one embodiment, the thickness of the NFC coil is 0.1 mm.

[0011] In one embodiment, the NFC tag further includes a chip, which is bound to the NFC coil.

[0012] The present invention also provides a method for preparing an NFC tag, which is used to manufacture the NFC tag according to any one of the above, comprising the following steps:

[0013] Obtain the NFC coil shape based on the preset simulation effect;

[0014] Obtaining a MXene solution, and using the MXene solution as a printing material;

[0015] NFC tags are printed on flexible substrates using direct-write printing technology.

[0016] In one embodiment, the step of obtaining a MXene solution includes:

[0017] TiH2, Al and C powders were mixed and sintered to obtain Ti3AlC2 MAX phase;

[0018] Sieving to obtain MAX phase powder;

[0019] Dissolving LiF in a hydrochloric acid solution to obtain an etching solution;

[0020] Centrifuging Ti3AlC2 in the etching solution and washing with deionized water until neutral to obtain nanosheets;

[0021] placing the nanosheets in water, shaking and centrifuging to obtain a layered solution, wherein the layered solution includes a supernatant;

[0022] Centrifuging the supernatant twice to obtain Ti3C2Tx MXene nanoparticles;

[0023] Ultrasonic treatment of the Ti3C2Tx MXene nanoparticles in an ice bath, and filtering to obtain a filtrate;

[0024] adding an aqueous solution of sodium carboxymethyl cellulose to the filtrate to obtain a mixture;

[0025] The mixture is ultrasonically treated and filtered to obtain the MXene solution.

[0026] The present invention provides an NFC tag comprising a substrate and an NFC coil, the NFC coil being disposed on the substrate and made of MXene. MXene's high conductivity can improve the sensitivity of the NFC tag, enabling it to respond more quickly to external signals. MXene also exhibits excellent conductivity, chemical stability, and solution processability, facilitating its manufacture. The MXene ink exhibits good adhesion to the substrate, enhancing the accuracy and integrity of the coil pattern, thereby improving the performance and consistency of the NFC tag. The NFC tag exhibits excellent conductivity and flexibility, allowing for bendability and suitability for a variety of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of an NFC tag provided by an embodiment of the present invention;

[0028] Figure 2This is a model diagram of the circular coil of the NFC tag provided by the embodiment of the present invention

[0029] Figure 3 This is a flowchart of a method for preparing an NFC tag provided by an embodiment of the present invention.

[0030] Description of labels:

[0031] 100. NFC tag; 1. substrate; 2. NFC coil.

[0032] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In recent years, with the rapid development of radio frequency identification (RFID) technology, NFC tags have been widely used in the Internet of Things (IoT), smart homes, mobile payments, and other fields. Traditional NFC tag manufacturing processes typically use etching, electroplating, and copper wire winding, which pose challenges such as complex manufacturing processes, high costs, and environmentally unfriendly materials.

[0037] Researchers are exploring new NFC tag manufacturing processes. Dispensing printing technology, with its advantages of low cost, contactless operation, low raw material consumption, digitalization, and additive manufacturing, offers a new approach to NFC tag manufacturing. However, existing dispensing printing technologies place high demands on the conductive ink's performance. For example, viscosity and surface tension must be within appropriate ranges to ensure stable and precise dispensing. Furthermore, the ink's adhesion to the substrate can affect the accuracy and integrity of the printed pattern. Existing printing inks often have poor overall performance, making them inconvenient to use.

[0038] MXene is a two-dimensional material. A research achievement of Drexel University in the United States, MXene differs from traditional batteries by providing more channels for ion movement, significantly increasing its speed. As a new type of two-dimensional metal carbide material, MXene possesses excellent conductivity, chemical stability, and solution processability, showing great potential for the preparation of high-performance conductive inks.

[0039] See also Figure 1 The present invention provides an NFC tag 100, including a substrate 1 and an NFC coil 2; the NFC coil 2 is arranged on the substrate 1, and the material of the NFC coil 2 includes MXene material.

[0040] The present invention provides an NFC tag comprising a substrate 1 and an NFC coil. The NFC coil is disposed on the substrate 1 and is made of MXene. MXene's high conductivity can improve the sensitivity of the NFC tag, enabling it to respond more quickly to external signals. MXene also exhibits excellent conductivity, chemical stability, and solution processability, facilitating its manufacture. The MXene ink exhibits good adhesion to the substrate 1, improving the accuracy and integrity of the coil pattern, thereby enhancing the performance and consistency of the NFC tag. The NFC tag exhibits excellent conductivity and flexibility, allowing for bendability and suitability for a variety of applications.

[0041] It should be noted that the substrate 1 is used to carry the NFC coil 2. There are multiple options for the substrate 1, as long as it can carry the NFC coil 2, for example, directly carrying it through a hard card to facilitate the production of the label.

[0042] Furthermore, the substrate 1 is a flexible substrate, so as to obtain a flexible NFC tag, which can meet the requirements in special environments without using a hard substrate, thereby facilitating the use of the NFC tag.

[0043] Specifically, the flexible substrate includes any one of photo paper, cotton fabric, and polyester fabric, so as to facilitate printing and manufacturing, control the production cost of the NFC tag, and control the use in different scenarios through the selection of materials.

[0044] In this embodiment, the flexible substrate is a cotton textile fabric, so as to facilitate the production of clothing with labels.

[0045] On the other hand, the thickness of the NFC coil 2 is 0.1 mm. In this case, the conductive material can be precisely coated on the substrate 1 of the NFC tag, achieving uniform distribution and precise control of the material, thereby improving the performance and consistency of the tag.

[0046] On the other hand, the NFC tag further includes a chip, which is bound to the NFC coil 2 to facilitate testing and use of the NFC tag.

[0047] Based on the above-mentioned NFC tag, the present invention further provides a method for preparing an NFC tag, which is used to manufacture the above-mentioned NFC tag. Therefore, the method has all the technical features of the above-mentioned NFC tag, that is, it has the technical effects brought about by all the above-mentioned technical features, which will not be described in detail here.

[0048] See also Figure 3 The preparation method of the NFC tag comprises the following steps:

[0049] S10. Obtaining the shape of the NFC coil according to a preset simulation effect;

[0050] When manufacturing the NFC tag, modeling and simulation are first performed in simulation software to obtain the shape of the coil, ensuring that the NFC coil is formed in one step and has a flexible and bendable structure.

[0051] S20, obtaining a MXene solution, and using the MXene solution as a printing material;

[0052] Among them, the high conductivity of MXene can improve the sensitivity of NFC tags, enabling them to respond to external signals more quickly.

[0053] S30. Print an NFC tag on a flexible substrate using direct-write printing technology.

[0054] The present invention provides an NFC tag, comprising a substrate and an NFC coil, wherein the NFC coil is arranged on the substrate and the material of the NFC coil includes MXene material. The MXene material is printed onto a flexible substrate by printing, and the manufacturing process is simple and environmentally friendly. The printing technology does not require complex etching, electroplating and other processes, which reduces the use of chemicals in the manufacturing process and is conducive to green and environmental protection development. At the same time, the manufacturing cost is low, and the printing technology consumes less raw materials, which reduces the manufacturing cost and is conducive to large-scale production. The MXene material used in the NFC tag has excellent conductivity, chemical stability and solution processability, meets the requirements of dispensing printing for ink viscosity, surface tension and other properties, ensures the stability and accuracy of dispensing printing, has good adhesion to the substrate, improves the accuracy and integrity of the printed pattern, thereby improving the performance and consistency of the NFC tag, and can respond to external signals more quickly. The NFC tag adopts a one-time dispensing printing process, has high manufacturing efficiency, and can realize rapid manufacturing of flexible NFC tags. The NFC tag has good conductivity and flexibility, can be bent for use, and is suitable for various application scenarios.

[0055] See also Figures 1 to 2 It should be noted that, in this embodiment, the shape of the NFC coil is a rectangular and circular coil with 8-13 turns obtained after modeling and simulation in simulation software. The printed NFC has the characteristics of one-time molding and good conductivity, and is flexible and bendable.

[0056] Based on the above-mentioned method for preparing the NFC tag, the present invention provides the following specific embodiments.

[0057] Example 1

[0058] A 13-turn square coil was simulated using CST simulation software. The number of turns, line width, and line spacing parameters were adjusted based on the results. The pattern was then imported into a microelectronics printer. The photo paper was then laid flat on the print table. A 50% MXene solution was added to the dispensing module. The dispensing needle height was set, and the print thickness was controlled to 0.1mm. The dispensing process was then initiated, and the NFC tag was cured in a static state. The print was completed in a single pass, taking approximately 15 minutes, with a total resistance of approximately 180Ω and no byproducts.

[0059] Example 2

[0060] An 8-turn square coil was simulated using CST simulation software. The number of turns, line width, and line spacing parameters were adjusted based on the results. The resulting pattern was then imported into a microelectronics printer. A cotton fabric was then laid flat on a printing table. A 50% MXene solution was added to the dispensing module. The needle height was set, and the print thickness was controlled to 0.1mm. The dispensing process was then initiated, and the NFC tag was cured in a static state. The printing process was completed in a single pass, taking approximately 10 minutes, with a total resistance of approximately 120Ω and no byproducts.

[0061] Example 3

[0062] An 8-turn circular coil is simulated using CST simulation software. The number of turns, line width, and line spacing parameters are adjusted based on the results. The graphics are then imported into a microelectronic printer. The cotton fabric is then laid flat on the print table. A 50% MXene solution is added to the dispensing module. The dispensing needle height is set, and the print thickness is controlled at 0.1mm. The dispensing print is then started, and the NFC tag is cured in a static state. The printing process is completed in one go, with a printing time of approximately 16 minutes, a total resistance of approximately 200Ω, and no by-products.

[0063] Furthermore, the steps of obtaining the MXene solution include:

[0064] S01, mixing TiH2, Al and C powders and sintering to obtain Ti3AlC2 MAX phase;

[0065] S02, sieving to obtain MAX phase powder;

[0066] S03, dissolving LiF in a hydrochloric acid solution to obtain an etching solution;

[0067] S04, centrifuging Ti3AlC2 in the etching solution and washing with deionized water until neutral to obtain nanosheets;

[0068] S05, placing the nanosheet in water, shaking and centrifuging to obtain a layered solution, wherein the layered solution includes a supernatant;

[0069] S06, centrifuging the supernatant a second time to obtain Ti3C2Tx MXene nanoparticles;

[0070] S07, ultrasonically treating the Ti3C2Tx MXene nanoparticles in an ice bath, and filtering to obtain a filtrate;

[0071] S08, adding an aqueous solution of sodium carboxymethyl cellulose to the filtrate to obtain a mixture;

[0072] S09. The mixture is ultrasonically treated and filtered to obtain the MXene solution.

[0073] In the present embodiment provided by the present invention, three powders of TiH2, Al and C are mixed in a certain proportion by a high-temperature solid-phase synthesis method, and sintered at a high temperature to obtain a Ti3AlC2MAX phase, which is then sieved to obtain a MAX phase powder; LiF is then weighed into a hydrochloric acid solution and stirred until dissolved, and the etching solution is slowly added to Ti3AlC2, stirred and then centrifuged, and washed with deionized water until neutral; the obtained nanosheets are shaken violently in water, then centrifuged, and the supernatant is centrifuged a second time, and the obtained low-molecular precipitate is dispersed in water. After intense vibration, a few-layer Ti3C2Tx MXene nanoparticles are obtained; ultrasonication is performed in an ice bath, filtration is performed with a nozzle, and an aqueous solution of sodium carboxymethyl cellulose is added to the filtrate. The resulting mixture is subjected to ultrasonication for 5 minutes at an ultrasonic power of 80W, and then filtered with a 0.22um filter membrane to obtain the desired MXene solution.

[0074] The present invention provides a specific embodiment in which TiH2, Al, and C powders are mixed in a specific ratio and sintered at high temperature to obtain a Ti3AlC2MAX phase. The MAX phase powder is then sieved 400 times. 1.5 g of LiF is weighed into 30 ml of 9 mol / L hydrochloric acid solution and stirred until dissolved. 1.5 g of Ti3AlC2 is slowly added to the 1.5 g of the above etching solution. The mixture is stirred at 35°C for 24 hours, then centrifuged at 3500 rpm and rinsed with deionized water until neutral. The nanosheets are vigorously shaken in water, then centrifuged at 1500 rpm, and the supernatant is centrifuged a second time. The resulting low-molecular-weight precipitate is dispersed in 1.5 mL of water at 3500 rpm and vigorously vibrated to obtain few-layer Ti3C2Tx MXene nanoparticles. Ultrasonicate in an ice bath at 80W for 30 minutes. Filter with a nozzle and sequentially add 0.15mL of PH-1000 and 1mL of a 0.2mg / mL aqueous solution of sodium carboxymethyl cellulose to the filtrate. Ultrasonicate the resulting mixture for 5 minutes at 80W, then filter through a 0.22µm filter membrane to obtain the desired MXene solution.

[0075] It should be noted that in this embodiment, in the NFC tag printed on the flexible substrate, the printing device is a microelectronic printer. The height of the dispensing needle is set by the printer so that the distance between it and the printing substrate is 0.1 to 0.2 mm. At this time, the conductive material can be accurately coated on the substrate of the NFC tag to achieve uniform distribution and precise control of the material, thereby improving the performance and consistency of the tag.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An NFC tag, characterized in that: include: substrate; as well as, An NFC coil is provided on the substrate, and the material of the NFC coil includes MXene material.

2. The NFC tag according to claim 1, wherein The substrate is a flexible substrate.

3. The NFC tag according to claim 1, wherein The flexible substrate includes any one of photographic paper, cotton textile fabric, and polyester textile fabric.

4. The NFC tag according to claim 1, wherein: The thickness of the NFC coil is 0.1 mm.

5. The NFC tag according to claim 1, wherein: The NFC tag also includes a chip, which is bound to the NFC coil.

6. A method for preparing an NFC tag, for manufacturing the NFC tag according to any one of claims 1 to 5, characterized in that: The following steps are involved: Obtain the NFC coil shape based on the preset simulation effect; Obtaining a MXene solution, and using the MXene solution as a printing material; NFC tags are printed on flexible substrates using direct-write printing technology.

7. The method for preparing the NFC tag according to claim 6, wherein: The steps to obtain MXene solution include: TiH2, Al and C powders were mixed and sintered to obtain Ti3AlC2 MAX phase; Sieving to obtain MAX phase powder; Dissolving LiF in a hydrochloric acid solution to obtain an etching solution; Centrifuging Ti3AlC2 in the etching solution and washing with deionized water until neutral to obtain nanosheets; placing the nanosheets in water, shaking and centrifuging to obtain a layered solution, wherein the layered solution includes a supernatant; Centrifuging the supernatant twice to obtain Ti3C2Tx MXene nanoparticles; Ultrasonic treatment of the Ti3C2Tx MXene nanoparticles in an ice bath, and filtering to obtain a filtrate; adding an aqueous solution of sodium carboxymethyl cellulose to the filtrate to obtain a mixture; The mixture is ultrasonically treated and filtered to obtain the MXene solution.

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