Multifunctional kudzu vine root powder hydrogel flexible conductive sensor and preparation method and application thereof

Abstract

The invention provides a multifunctional kudzu vine root powder hydrogel flexible conductive sensor as well as a preparation method and application thereof, and relates to the field of flexible sensor materials. The multifunctional kudzu vine root powder hydrogel flexible conductive sensor is prepared from the following raw materials in percentage by mass: 5%-10% of kudzu vine root starch, 1%-5% of polyvinyl alcohol, 1%-5% of skirt kelp powder, 10%-15% of creatine phosphate sodium and deionized water. The flexible conductive sensor which has the advantages of damage resistance, freezing resistance, drying resistance, cancer resistance and cytocompatibility at the same time is prepared by adopting a unique raw material formula and simple steps under the conditions that toxic raw materials, volatile solvents and corrosive raw materials are not used and complicated chemical reactions are not used, so that the application range of the flexible conductive sensor is expanded; and the service time is prolonged. And the flexible conductive sensor can be applied to conductive materials, intelligent screen touch screen materials, wearable flexible materials and the like.

Description

Technical Field

[0001] The invention relates to the technical field of flexible sensors, and in particular to a multifunctional kudzu root powder hydrogel flexible conductive sensor and a preparation method and application thereof. Background Art

[0002] Hydrogel flexible sensors are a new type of flexible sensor developed in recent years. They can convert strains of various sizes into electrical signals and have broad application prospects in industries such as supercapacitors, wearable devices, and soft robots. However, it is difficult for existing hydrogel flexible sensors to achieve the integration of advantages such as anti-cancer, cell compatibility, anti-freeze, anti-drying, and anti-destruction. This defect seriously limits the widespread application of flexible sensors.

[0003] In addition, most flexible sensors in the prior art still have the following problems: the preparation process is complicated, the product needs to be purified, there are pollutants discharged, special equipment is required, a series of chemical reactions are involved, and it is difficult to complete industrial applications, etc. Therefore, it is still challenging to develop new flexible sensors that can simultaneously meet the advantages of anti-cancer, cell compatibility, anti-freeze, anti-drying, and anti-destruction. Summary of the invention

[0004] The invention provides a multifunctional kudzu root powder hydrogel flexible conductive sensor and a preparation method and application thereof, the purpose of which is to solve the above-mentioned problems existing in the background technology.

[0005] In order to achieve the above-mentioned purpose, the embodiments of the present invention provide a multifunctional kudzu root powder hydrogel flexible conductive sensor and a preparation method and application thereof. The present invention adopts a unique raw material formula and prepares a flexible conductive sensor with the advantages of anti-destruction, anti-freeze, anti-drying, anti-cancer and cell compatibility through simple steps without using toxic raw materials, volatile solvents, corrosive raw materials, and complex chemical reactions, so as to expand its application range and prolong its use time.

[0006] An embodiment of the present invention provides a multifunctional kudzu root powder hydrogel flexible conductive sensor. The raw materials for preparing the multifunctional kudzu root powder hydrogel flexible conductive sensor include the following components in percentage by mass: 5% to 10% kudzu root starch, 1% to 5% polyvinyl alcohol, 1% to 5% kelp powder, 10% to 15% sodium creatine phosphate and deionized water.

[0007] Preferably, the weight average molecular weight of the polyvinyl alcohol is 50,000 to 100,000, and the alcoholysis degree is 99%.

[0008] Preferably, the Young's modulus of the multifunctional kudzu root powder hydrogel flexible conductive sensor is 0.1-0.6 Mpa.

[0009] Preferably, the multifunctional kudzu root powder hydrogel flexible conductive sensor has anti-cancer, cell-compatible, anti-freeze, anti-drying and anti-destruction properties.

[0010] Based on a general concept of the invention, an embodiment of the present invention provides a method for preparing the above-mentioned multifunctional kudzu root powder hydrogel flexible conductive sensor, comprising the following steps:

[0011] S1: Weigh 1 part of washed and peeled fresh kudzu root and 1 part of water according to weight, put them into a wall breaking machine, and start the wall breaking machine 10 to 15 times, each time for 3 to 5 minutes, to obtain kudzu root slurry;

[0012] S2, filtering the kudzu root slurry, collecting the filtrate and allowing it to settle, freeze-drying, and drying to obtain kudzu root starch;

[0013] S3, according to the weight ratio, weigh 1 part of washed kelp and 1 part of water, put them into a wall breaking machine, start the wall breaking machine 10 to 15 times, each time for 3 to 5 minutes, to obtain kelp slurry;

[0014] S4, filtering the Laminaria japonica slurry, collecting the filtrate and allowing it to settle, freeze-drying, and drying to obtain Laminaria japonica powder;

[0015] S5. Weigh 5 to 10 parts of kudzu starch, 1 to 5 parts of polyvinyl alcohol, 1 to 5 parts of kelp powder, 10 to 15 parts of sodium creatine phosphate and 100 parts of deionized water respectively according to weight, stir well, and stir at 90 to 100 ° C for 1 to 4 hours to prepare a mixed solution;

[0016] S6. Pour the mixed solution into a mold and place it at room temperature for 4 to 48 hours to obtain a finished flexible sensor.

[0017] Preferably, in step S5, the stirring speed is 1000-1800 r / min.

[0018] Preferably, in step S6, the mold is a standard dumbbell-shaped mold.

[0019] The embodiments of the present invention also provide the application of the multifunctional kudzu root powder hydrogel flexible conductive sensor in conductive materials.

[0020] An embodiment of the present invention also provides the use of the above-mentioned multifunctional kudzu root powder hydrogel flexible conductive sensor in smart screen touch screen materials.

[0021] An embodiment of the present invention also provides an application of the above-mentioned multifunctional kudzu root powder hydrogel flexible conductive sensor in wearable flexible materials.

[0022] The flexible conductive sensor comprises a long flexible sensor body, and copper foil connecting strips are respectively coated on both ends of the flexible sensor body in the length direction, and the copper foil connecting strips are connected to the wires.

[0023] Mechanism description

[0024] Although kudzu root powder can be used to construct green hydrogel sensors, pure kudzu root powder aqueous solution cannot be made into hydrogel even after multiple freezing treatments or heating treatments. The gel product can only be obtained in the presence of alkaline substances (such as potassium hydroxide) and chemical cross-linking agents (such as epichlorohydrin) at a temperature greater than or equal to 50 degrees Celsius, after chemical reaction cross-linking and complex subsequent removal of alkaline substances and cross-linking agent residues. Moreover, the preparation is cumbersome, time-consuming, and requires alkali-resistant equipment and other defects. The present invention uses the hydroxyl groups on the polyvinyl alcohol molecular chain, the amino groups on the sodium creatine phosphate molecules, the carboxyl groups, and the oxygen atoms on P=O to form hydrogen bonds with the hydroxyl groups on the kudzu root powder molecular chain, accelerate the formation of kudzu root powder hydrogel, shorten the preparation time, simplify the preparation process, and significantly enhance its mechanical properties. At the same time, the super hydrogen bond network formed between the five components of kudzu root powder, polyvinyl alcohol, kelp powder, sodium creatine phosphate, and water is used to reduce the freezing point of the hydrogel and inhibit the evaporation of water in the hydrogel, thereby significantly improving the antifreeze and anti-drying capabilities of the kudzu root-based hydrogel.

[0025] The above scheme of the present invention has the following beneficial effects:

[0026] (1) The flexible conductive sensor of the present invention can simultaneously meet the excellent properties of anti-destruction, anti-freezing, anti-drying, anti-cancer and cell compatibility, has obvious cancer cell killing ability, and also has good cell compatibility. It can carry a weight of 85 kg without being broken, and can punch holes in the film-like flexible conductive sensor or cut the side of the film without being damaged under 400% strain stretching, and has strong anti-destruction ability.

[0027] (2) The flexible conductive sensor of the present invention has extremely strong anti-freezing ability and still has good elasticity and conductivity in an environment of minus 90 degrees Celsius, and can be used in low-temperature and severe cold environments.

[0028] (3) The flexible conductive sensor of the present invention has a strong anti-drying ability. After being placed at room temperature for 6 months, it still has good elasticity, toughness and conductivity. It can be used for a long time in an open environment, and its service life is extended.

[0029] (4) The flexible sensor preparation process of the present invention is green and environmentally friendly. Toxic, volatile, and corrosive raw materials are not used in the preparation process, no pollutants are discharged, and no complex chemical reactions are involved. The raw materials are cheap and easy to obtain, the investment cost is low, the applicability is strong and wide, and it is easy to realize industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a diagram demonstrating the anti-destruction capability of the flexible conductive sensor according to an embodiment of the present invention;

[0032] Figure 2 This is a diagram demonstrating the flexibility of the flexible conductive sensor of an embodiment of the present invention at a temperature of minus 80 degrees Celsius;

[0033] Figure 3 This is a demonstration diagram of the flexible conductive sensor of an embodiment of the present invention conducting electricity at a temperature of minus 80 degrees Celsius;

[0034] Figure 4 This is a demonstration diagram of the flexibility of the flexible conductive sensor of an embodiment of the present invention in an open environment for 3 months;

[0035] Figure 5 This is a demonstration diagram of the conductivity of the flexible conductive sensor according to an embodiment of the present invention in an open environment for 3 months. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0037] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0038] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0039] In view of the existing problems, the present invention provides a multifunctional kudzu root powder hydrogel flexible conductive sensor. The raw materials for preparing the multifunctional kudzu root powder hydrogel flexible conductive sensor include the following components in percentage by mass: 5% to 10% kudzu root starch, 1% to 5% polyvinyl alcohol, 1% to 5% kelp powder, 10% to 15% sodium creatine phosphate and deionized water.

[0040] Preferably, the weight average molecular weight of the polyvinyl alcohol is 50,000 to 100,000, and the alcoholysis degree is 99%.

[0041] Preferably, the Young's modulus of the multifunctional kudzu root powder hydrogel flexible conductive sensor is 0.1-0.6 Mpa.

[0042] Preferably, the multifunctional kudzu root powder hydrogel flexible conductive sensor has anti-cancer, cell-compatible, anti-freeze, anti-drying and anti-destruction properties.

[0043] Based on a general concept of the invention, an embodiment of the present invention provides a method for preparing the above-mentioned multifunctional kudzu root powder hydrogel flexible conductive sensor, comprising the following steps:

[0044] S1: Weigh 1 part of washed and peeled fresh kudzu root and 1 part of water according to weight, put them into a wall breaking machine, and start the wall breaking machine 10 to 15 times, each time for 3 to 5 minutes, to obtain kudzu root slurry;

[0045] S2, filtering the kudzu root slurry, collecting the filtrate and allowing it to settle, freeze-drying, and drying to obtain kudzu root starch;

[0046] S3, according to the weight ratio, weigh 1 part of washed kelp and 1 part of water, put them into a wall breaking machine, start the wall breaking machine 10 to 15 times, each time for 3 to 5 minutes, to obtain kelp slurry;

[0047] S4, filtering the Laminaria japonica slurry, collecting the filtrate and allowing it to settle, freeze-drying, and drying to obtain Laminaria japonica powder;

[0048] S5. According to weight proportions, weigh 5 to 10 parts of kudzu root starch, 1 to 5 parts of polyvinyl alcohol, 1 to 5 parts of kelp powder, 10 to 15 parts of sodium creatine phosphate and 100 parts of deionized water, stir well to mix, and then stir at 90 to 100° C. for 1 to 4 hours to obtain a mixed solution;

[0049] S6. Pour the mixed solution into a mold and place it at room temperature for 4 to 48 hours to obtain a finished flexible sensor.

[0050] Preferably, in step S5, the stirring speed is 1000-1800 r / min.

[0051] Preferably, in step S6, the mold is a standard dumbbell-shaped mold.

[0052] The embodiments of the present invention also provide the application of the multifunctional kudzu root powder hydrogel flexible conductive sensor in conductive materials.

[0053] An embodiment of the present invention also provides the use of the above-mentioned multifunctional kudzu root powder hydrogel flexible conductive sensor in smart screen touch screen materials.

[0054] An embodiment of the present invention also provides an application of the above-mentioned multifunctional kudzu root powder hydrogel flexible conductive sensor in wearable flexible materials.

[0055] The flexible conductive sensor comprises a long flexible sensor body, and copper foil connecting strips are respectively coated on both ends of the flexible sensor body in the length direction, and the copper foil connecting strips are connected to the wires.

[0056] The following is a detailed description through specific embodiments.

[0057] Example 1

[0058] A method for preparing a multifunctional kudzu root powder hydrogel flexible conductive sensor comprises the following steps:

[0059] (1) According to the weight percentage (based on the mass of water), the concentration of kudzu root starch is 10%, the concentration of polyvinyl alcohol is 5%, the concentration of kelp powder is 5%, and the concentration of sodium creatine phosphate is 10%. Weigh 5 g of kudzu root starch, 2.5 g of polyvinyl alcohol, 2.5 g of kelp powder, and 5 g of sodium creatine phosphate, add 50 g of deionized water, and stir at 95° C. for 4 h to obtain a mixed solution of kudzu root starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate, which is set aside;

[0060] (2) pouring the mixed solution of kudzu starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate prepared in step (1) into a standard dumbbell-shaped mold at room temperature;

[0061] (3) placing the mold containing the mixed solution in step (2) at room temperature for 48 hours to obtain a finished flexible sensor.

[0062] It was determined that the finished flexible sensor obtained in this embodiment had a stress of 25 MPa, a strain of 600%, a Young's modulus of 0.5 MPa, an electrical conductivity of 16 S / m, and good flexibility.

[0063] Example 2

[0064] A method for preparing a multifunctional kudzu root powder hydrogel flexible conductive sensor comprises the following steps:

[0065] (1) According to the weight percentage (based on the mass of water), the concentration of kudzu root starch is 10%, the concentration of polyvinyl alcohol is 3%, the concentration of kelp powder is 3%, and the concentration of sodium creatine phosphate is 15%. Weigh 5 g of kudzu root starch, 1.5 g of polyvinyl alcohol, 1.5 g of kelp powder, and 7.5 g of sodium creatine phosphate, add 50 g of deionized water, and stir at 95° C. for 4 h to obtain a kudzu root starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate mixed solution for later use;

[0066] (2) pouring the mixed solution of kudzu starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate prepared in step (1) into a standard dumbbell-shaped mold at room temperature;

[0067] (3) placing the mold containing the mixed solution in step (2) at room temperature for 24 hours to obtain a finished flexible sensor.

[0068] It was determined that the finished flexible sensor obtained in this embodiment had a stress of 20 MPa, a strain of 700%, a Young's modulus of 0.4 MPa, an electrical conductivity of 20 S / m, and good flexibility.

[0069] Example 3

[0070] A method for preparing a multifunctional kudzu root powder hydrogel flexible conductive sensor comprises the following steps:

[0071] (1) According to the weight percentage (based on the mass of water), the concentration of kudzu root starch is 5%, the concentration of polyvinyl alcohol is 5%, the concentration of kelp powder is 5%, and the concentration of sodium creatine phosphate is 15%. Weigh 2.5 g of kudzu root starch, 2.5 g of polyvinyl alcohol, 2.5 g of kelp powder, and 7.5 g of sodium creatine phosphate, add 50 g of deionized water, and stir at 95° C. for 4 h to obtain a kudzu root starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate mixed solution for later use;

[0072] (2) pouring the mixed solution of kudzu starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate prepared in step (1) into a standard dumbbell-shaped mold at room temperature;

[0073] (3) placing the mold containing the mixed solution in step (2) at room temperature for 12 hours to obtain a finished flexible sensor.

[0074] It was determined that the finished flexible sensor obtained in this embodiment had a stress of 23 MPa, a strain of 650%, a Young's modulus of 0.3 MPa, an electrical conductivity of 20 S / m, and good flexibility.

[0075] Example 4

[0076] A method for preparing a multifunctional kudzu root powder hydrogel flexible conductive sensor comprises the following steps:

[0077] (1) According to the weight percentage (based on the mass of water), the concentration of kudzu root starch is 10%, the concentration of polyvinyl alcohol is 5%, the concentration of kelp powder is 5%, and the concentration of sodium creatine phosphate is 10%. Weigh 5 g of kudzu root starch, 2.5 g of polyvinyl alcohol, 2.5 g of kelp powder, and 5 g of sodium creatine phosphate, add 50 g of deionized water, and stir at 95° C. for 4 h to obtain a mixed solution of kudzu root starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate, which is set aside;

[0078] (2) at room temperature, pour the mixed solution of kudzu starch / kelp powder / polyvinyl alcohol / sodium creatine phosphate prepared in step (1) into a mold with a diameter of 2 cm and a length of 5 cm;

[0079] (3) placing the mold containing the mixed solution in step (2) at room temperature for 48 hours to obtain a finished flexible sensor.

[0080] Comparative Example 1

[0081] The difference between this comparative example and Example 1 is that polyvinyl alcohol is replaced by polyacrylamide, and the other steps and parameters are the same as those in Example 1.

[0082] It was determined that the finished flexible sensor obtained in this comparative example had a stress of 0.02 MPa, a strain of 250%, a Young's modulus of 0.55 MPa, and an electrical conductivity of 16 S / m, indicating low flexibility.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 3 is that tetraethylene glycol is replaced by DMSO, and the other steps and parameters are the same as those in Example 3.

[0085] It was determined that the finished flexible sensor obtained in this comparative example had a stress of 0.03 MPa, a strain of 300%, a Young's modulus of 0.37 MPa, and an electrical conductivity of 18 S / m, indicating low flexibility.

[0086] Comparative Example 3

[0087] The difference between this comparative example and Example 4 is that sodium creatine phosphate is replaced by sodium glycine, and the other steps and parameters are the same as those of Example 4.

[0088] It has been determined that the finished flexible sensor obtained in this comparative example cannot bear a weight of 85 kg.

[0089] Performance test

[0090] 1. Demonstration of anti-destruction capability

[0091] The flexible sensor prepared in Example 4 of the present invention was used to demonstrate mechanical properties. Figure 1 As shown: the flexible sensor prepared in Example 4 is placed on a horizontal bar, and a male student weighing 85 kg holds the flexible sensor with his hands and his feet are suspended in the air, and the flexible sensor is not broken. The above proves that the flexible sensor has a strong anti-destruction ability.

[0092] 2. Demonstration of antifreeze ability

[0093] The antifreeze performance of the flexible sensor prepared in Example 1 of the present invention is demonstrated, as shown in the attached Figure 2 As shown in the figure: After being frozen at -80 degrees for 8 hours, the flexible sensor has good flexibility and is not frozen solid. Moreover, when the flexible sensor is connected to a circuit at -80 degrees, the LED bulb still maintains a high brightness, as shown in the figure below. Figure 3 It is shown in the figure. It proves that it has strong antifreeze ability and can be used in extremely low temperature environment.

[0094] 3. Demonstration of anti-drying ability

[0095] The anti-drying performance of the flexible sensor prepared in Example 2 of the present invention is demonstrated, as shown in the attached Figure 4 As shown in the figure: After being placed in an open environment for 3 months, the flexible sensor has good flexibility and has not dried into a solid. Moreover, after the flexible sensor is placed in an open environment for 3 months, it is connected to a circuit and the LED bulb still maintains a high brightness, as shown in the figure. Figure 5 It is shown that it has strong anti-drying ability and can be used for a long time in an open environment.

[0096] 4. Anti-cancer ability test

[0097] The flexible sensor prepared in Example 3 of the present invention was tested for its cancer cell killing ability:

[0098] The MTT cytotoxicity test was used to analyze the effect of the flexible sensor on human liver cancer HepG2 cells. The survival rate of cancer cells after 24 hours was only 76%, indicating that it has a strong ability to kill cancer cells.

[0099] 5. Cytocompatibility test

[0100] The flexible sensor prepared in Example 1 of the present invention was subjected to a cell compatibility test: the MTT cytotoxicity test was used to analyze the effect of the flexible sensor on human renal epithelial 293T cells. The cell survival rate after 24 hours was as high as 97%, indicating strong cell compatibility.

[0101] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multifunctional kudzu root powder hydrogel flexible conductive sensor, characterized in that: The raw materials for preparing the multifunctional kudzu root powder hydrogel flexible conductive sensor include the following components in terms of mass percentage: 5% to 10% kudzu root starch, 1% to 5% polyvinyl alcohol, 1% to 5% kelp powder, 10% to 15% sodium creatine phosphate and deionized water.

2. The multifunctional kudzu root powder hydrogel flexible conductive sensor according to claim 1, characterized in that: The weight average molecular weight of the polyvinyl alcohol is 50,000-100,000, and the alcoholysis degree is 99%.

3. The multifunctional kudzu root powder hydrogel flexible conductive sensor according to claim 1, characterized in that: The Young's modulus of the multifunctional kudzu root powder hydrogel flexible conductive sensor is 0.1-0.6 Mpa.

4. The multifunctional kudzu root powder hydrogel flexible conductive sensor according to claim 1, characterized in that: The multifunctional kudzu root powder hydrogel flexible conductive sensor has anti-cancer, cell-compatible, anti-freeze, anti-drying and anti-destruction properties.

5. The method for preparing the multifunctional kudzu root powder hydrogel flexible conductive sensor according to any one of claims 1 to 4, characterized in that: The steps include: S1: Weigh 1 part of washed and peeled fresh kudzu root and 1 part of water according to weight, put them into a wall breaking machine, and start the wall breaking machine 10 to 15 times, each time for 3 to 5 minutes, to obtain kudzu root slurry; S2, filtering the kudzu root slurry, collecting the filtrate and allowing it to settle, freeze-drying, and drying to obtain kudzu root starch; S3, according to the weight ratio, weigh 1 part of washed kelp and 1 part of water, put them into a wall breaking machine, start the wall breaking machine 10 to 15 times, each time for 3 to 5 minutes, to obtain kelp slurry; S4, filtering the Laminaria japonica slurry, collecting the filtrate and allowing it to settle, freeze-drying, and drying to obtain Laminaria japonica powder; S5. Weigh 5 to 10 parts of kudzu starch, 1 to 5 parts of polyvinyl alcohol, 1 to 5 parts of kelp powder, 10 to 15 parts of sodium creatine phosphate and 100 parts of deionized water respectively according to weight, stir well, and stir at 90 to 100 ° C for 1 to 4 hours to prepare a mixed solution; S6. Pour the mixed solution into a mold and place it at room temperature for 4 to 48 hours to obtain a finished flexible sensor.

6. The method for preparing the multifunctional kudzu root powder hydrogel flexible conductive sensor according to claim 1, characterized in that: In step S5, the stirring speed is 1000-1800 r / min.

7. The method for preparing the multifunctional kudzu root powder hydrogel flexible conductive sensor according to claim 1, characterized in that: In step S6, the mold is a standard dumbbell-shaped mold.

8. Use of the multifunctional kudzu root powder hydrogel flexible conductive sensor according to any one of claims 1 to 4 or the multifunctional kudzu root powder hydrogel flexible conductive sensor obtained by the preparation method according to any one of claims 5 to 7 in conductive materials.

9. Application of the multifunctional kudzu root powder hydrogel flexible conductive sensor according to any one of claims 1 to 4 or the multifunctional kudzu root powder hydrogel flexible conductive sensor obtained by the preparation method according to any one of claims 5 to 7 in smart screen touch screen materials.

10. Use of the multifunctional kudzu root powder hydrogel flexible conductive sensor according to any one of claims 1 to 4 or the multifunctional kudzu root powder hydrogel flexible conductive sensor obtained by the preparation method according to any one of claims 5 to 7 in wearable flexible materials.

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