Preparation Method and Application of Flexible Cotton Fabric-Based Piezoelectric Sensor Impregnated with Eggshell Membrane

Abstract

This application relates to a preparation method and application of a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane, and belongs to the field of flexible fabric sensors. The method includes: dissolving eggshell membrane powder in an aqueous solution and stirring until it is fully dissolved to obtain an eggshell membrane aqueous solution; adding cotton fabric to the eggshell membrane aqueous solution for sufficient impregnation, and after sufficient impregnation, taking out the cotton fabric from the aqueous solution treatment liquid to obtain impregnated cotton fabric; placing the impregnated cotton fabric in a vacuum drying oven for drying until the impregnated cotton fabric is completely dry to obtain piezoelectric sensing cotton fabric; using a double-sided conductive copper foil tape to encapsulate the piezoelectric sensing cotton fabric to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane. By utilizing the interaction between the abundant hydroxyl groups in the eggshell membrane and cellulose and the inherent piezoelectric sensitivity, the piezoelectric performance of cellulose-based cotton fabric is improved, and the prepared flexible cotton fabric-based piezoelectric sensor has good biocompatibility and degradability.

Description

Technical Field

[0001] This application relates to the technical field of flexible fabric sensors, and particularly relates to a preparation method and application of a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane. Background Art

[0002] With the rapid development of artificial intelligence and human-computer interaction interfaces, wearable and flexible electronic devices are of great significance for meeting the increasingly complex requirements of modern electronic products. Flexible textiles have become ideal materials for manufacturing wearable electronic products due to their advantages such as light weight, large specific surface area, good deformation recovery, good flexibility, and good wearing comfort. With the increasingly serious global resource crisis and climate change, the development of sustainable clean energy has been regarded as an important goal in the world today. Piezoelectric nanogenerators have the advantages of small size, easy operation, and completely independent operation, and are considered to be one of the most promising renewable energy sources for converting sustainable clean mechanical energy into green electricity. However, most piezoelectric nanogenerators are made of non-ecological piezoelectric materials, with a long material synthesis process and a complex and expensive device manufacturing process. Therefore, there is currently a high interest in finding naturally driven bioorganic piezoelectric materials to address the eco-friendly aspects of piezoelectric nanogenerators.

[0003] Cellulose, as a widely existing and novel piezoelectric polymer, has good biocompatibility and biodegradability. Based on natural cotton fibers, electronic textiles with characteristics such as shape cutability, light weight, flexible deformability, and humanized wearability have received extensive attention in a wide range of research fields such as sensors, energy harvesting devices, and human-computer interfaces. However, natural cellulose exhibits limited piezoelectricity, and its piezoelectric coefficient d 33 is approximately 0.4 pC / N, which is less than that of classical piezoelectric materials. This limits its application in high-performance piezoelectric nanogenerators, especially in electronic instruments that require higher power sources. Therefore, it is very necessary to improve the piezoelectric performance of cellulose-based nanogenerators to manufacture reliable, renewable, and biocompatible piezoelectric nanogenerators based on biomaterials.

[0004] Current research mostly improves the piezoelectricity of cellulose by adding nanomaterials with high-voltage electrical effects to adjust the dipole arrangement. However, the interaction between these nanomaterials and cellulose is weak, and simply mixing them is not conducive to the uniform dispersion of nanoparticles in cellulose, thus reducing the piezoelectric performance and limiting the application scope of wearable electronic products. As one of the wastes in the environment, eggshell membrane contains various proteins rich in functional groups such as hydroxyl groups, and has good adsorption, moisture retention, and biocompatibility. At the same time, the collagen contained in the eggshell membrane has shear and longitudinal piezoelectric sensitivity, making it a natural bioelectret material for energy harvesting. Through the cross-linking effect between the hydroxyl groups of the eggshell membrane and cellulose molecules, the piezoelectric performance of cellulose-based cotton fabrics can be effectively improved. Therefore, it is necessary to study the preparation method and application of flexible cotton fabric-based piezoelectric sensors based on eggshell membrane. Summary of the Invention

[0005] The purpose of this application is to provide a preparation method and application of a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] In the first aspect, this application provides a preparation method of a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane, including the following steps:

[0008] S1. Dissolve the eggshell membrane powder in an aqueous solution and stir until it is fully dissolved to obtain an eggshell membrane aqueous solution;

[0009] S2. Add the cotton fabric to the eggshell membrane aqueous solution for sufficient impregnation, and after sufficient impregnation, take out the cotton fabric from the aqueous solution treatment liquid to obtain the impregnated cotton fabric;

[0010] S3. Place the impregnated cotton fabric in a vacuum drying oven for drying until the impregnated cotton fabric is completely dry to obtain a piezoelectric sensing cotton fabric;

[0011] S4. Package the piezoelectric sensing cotton fabric with a double-sided conductive copper foil tape to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane.

[0012] In a possible implementation manner, in step S1:

[0013] The concentration of the eggshell membrane aqueous solution is 10% to 15%.

[0014] In a possible implementation manner, in step S2:

[0015] The impregnation time of the cotton fabric in the eggshell membrane aqueous solution is 6 to 8 h.

[0016] In a possible implementation, in step S2:

[0017] The impregnation temperature of the cotton fabric in the aqueous solution of eggshell membrane is 25 to 30 °C.

[0018] In a possible implementation, in step S3:

[0019] The drying duration of the impregnated cotton fabric in the vacuum drying oven is 1 to 2 h.

[0020] In a possible implementation, in step S3:

[0021] The drying temperature of the impregnated cotton fabric in the vacuum drying oven is 50 to 60 °C.

[0022] In a second aspect, the present application provides a flexible cotton fabric-based piezoelectric sensor, which is prepared by the method for preparing a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane as described in any one of the above.

[0023] In a possible implementation, the thickness of the flexible cotton fabric-based piezoelectric sensor is 2 to 3 mm.

[0024] In a third aspect, the present application provides an application of the above flexible cotton fabric-based piezoelectric sensor in the fields of human-computer interaction, human motion detection, and intelligent wearable devices.

[0025] The beneficial effects brought by the technical solution provided by the present application at least include:

[0026] By dissolving eggshell membrane powder in an aqueous solution and stirring until it is fully dissolved, an eggshell membrane aqueous solution is obtained; adding a cotton fabric to the eggshell membrane aqueous solution for sufficient impregnation, and after sufficient impregnation, taking out the cotton fabric from the aqueous solution treatment liquid to obtain an impregnated cotton fabric; placing the impregnated cotton fabric in a vacuum drying oven for drying until the impregnated cotton fabric is completely dry to obtain a piezoelectric sensing cotton fabric; using a double-sided conductive copper foil tape to encapsulate the piezoelectric sensing cotton fabric to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane. In this case, first, the cotton fabric used in the present application has a periodic coil network structure, which provides advantages for manufacturing sensors with good repeatability and high flexibility; second, the eggshell membrane used in the present application belongs to waste in the environment, reflecting the concept of resource recycling and environmental protection. At the same time, by utilizing the interaction between the abundant hydroxyl groups in the eggshell membrane and cellulose and the inherent piezoelectric sensitivity, the piezoelectric performance of the cellulose-based cotton fabric is improved; then, the preparation method provided by the present application is simple in operation, high in production efficiency, environmentally friendly, and can be mass-produced; finally, the flexible cotton fabric-based piezoelectric sensor prepared by the application has good biocompatibility and degradability, generates a significant piezoelectric response under the excitation of small vibrations, can become an alternative source of green energy, and can be widely applied to the fields of human-computer interaction, human motion detection, and intelligent wearable devices. Description of the Drawings

[0027] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings:

[0028] Figure 1 A flowchart showing the preparation method of a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane provided by an exemplary embodiment of the present application is shown;

[0029] Figure 2 Scanning electron microscope images of pure cotton fabric and cotton fabric impregnated with eggshell membrane are shown, where (a), (b), (c) are scanning electron microscope images of pure cotton fabric, and (a'), (b'), (c') are scanning electron microscope images of cotton fabric impregnated with eggshell membrane;

[0030] Figure 3 A diagram showing the mechanism of action between eggshell membrane and cotton fabric is shown;

[0031] Figure 4 Fourier transform infrared spectra of pure cotton fabric and cotton fabric impregnated with eggshell membrane are shown;

[0032] Figure 5 Graphs showing the test results of the piezoelectric performance of cotton fabric before and after impregnation with eggshell membrane are shown. Detailed Embodiments

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0034] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings of the present application specification, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to facing or away from a specific component, respectively. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application specification, "a plurality of" means two or more.

[0035] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Embodiment 1:

[0037] Figure 1 The flowchart of the preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane provided by an exemplary embodiment of the present application is shown. The method includes the following steps:

[0038] Step S1: Dissolve the eggshell membrane powder in an aqueous solution and stir until it is fully dissolved to obtain an eggshell membrane aqueous solution.

[0039] In the embodiment of the present application, the concentration of the eggshell membrane aqueous solution is 10% to 15%.

[0040] Step S2: Add the cotton fabric to the eggshell membrane aqueous solution for sufficient impregnation. After sufficient impregnation, take out the cotton fabric from the aqueous solution treatment liquid to obtain the impregnated cotton fabric.

[0041] In the embodiment of the present application, the impregnation time of the cotton fabric in the eggshell membrane aqueous solution is 6 to 8 h, and the impregnation temperature is 25 to 30 °C.

[0042] Step S3: Place the impregnated cotton fabric in a vacuum drying oven for drying until the impregnated cotton fabric is completely dry to obtain the piezoelectric sensing cotton fabric.

[0043] In the embodiment of the present application, the drying time of the impregnated cotton fabric in the vacuum drying oven is 1 to 2 h, and the drying temperature is 50 to 60 °C.

[0044] Step S4: Encapsulate the piezoelectric sensing cotton fabric with a double-sided conductive copper foil tape to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane.

[0045] In the embodiment of the present application, the thickness of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane prepared by this preparation method is 2 to 3 mm.

[0046] In summary, the cotton fabric used in the present application has a periodic coil network structure, which provides advantages for manufacturing sensors with good repeatability and high flexibility; secondly, the eggshell membrane used in the present application belongs to waste in the environment, reflecting the concept of resource recycling and environmental protection. At the same time, by utilizing the interaction between the abundant hydroxyl groups in the eggshell membrane and cellulose and the inherent piezoelectric sensitivity, the piezoelectric performance of the cellulose-based cotton fabric is improved; then, the preparation method provided in the present application is simple in operation, high in production efficiency, environmentally friendly, and can be mass-produced; finally, the flexible cotton fabric-based piezoelectric sensor prepared in the application has good biocompatibility and degradability, generates a significant piezoelectric response under the excitation of small vibrations, can become a source of alternative green energy, and can be widely applied in the fields of human-computer interaction, human motion detection, and intelligent wearable devices.

[0047] Example Two:

[0048] In a specific embodiment, the preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane includes the following steps:

[0049] Step S1: Dissolve 5 g of eggshell membrane powder in 40 ml of aqueous solution and stir until fully dissolved to obtain an eggshell membrane aqueous solution with a concentration of 11.1%.

[0050] Step S2: Immerse the cotton fabric in the eggshell membrane aqueous solution for 6 h. After sufficient immersion, take out the cotton fabric from the aqueous solution treatment liquid to obtain the impregnated cotton fabric.

[0051] Step S3: Place the impregnated cotton fabric in a vacuum drying oven at a temperature of 50 °C and dry it for 1 h until the impregnated cotton fabric is completely dry to obtain the piezoelectric sensing cotton fabric.

[0052] Step S4: Encapsulate the piezoelectric sensing cotton fabric with a double-sided conductive copper foil tape to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane with a thickness of 2 mm.

[0053] Example Three:

[0054] In another specific embodiment, the preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane includes the following steps:

[0055] Step S1: Dissolve 5 g of eggshell membrane powder in 40 ml of aqueous solution and stir until completely dissolved to obtain an eggshell membrane aqueous solution with a concentration of 11.1%.

[0056] Step S2: Immerse the cotton fabric in the eggshell membrane aqueous solution for 7 h. After sufficient immersion, take out the cotton fabric from the aqueous solution treatment liquid to obtain the immersed cotton fabric.

[0057] Step S3: Place the immersed cotton fabric in a vacuum drying oven at a temperature of 55 °C and dry for 1.5 h until the immersed cotton fabric is completely dry to obtain the piezoelectric sensing cotton fabric.

[0058] Step S4: Package the piezoelectric sensing cotton fabric with a double-sided conductive copper foil tape to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane with a thickness of 2 mm.

[0059] Example 4:

[0060] In another specific embodiment, the preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane includes the following steps:

[0061] Step S1: Dissolve 8 g of eggshell membrane powder in 50 ml of aqueous solution and stir until completely dissolved to obtain an eggshell membrane aqueous solution with a concentration of 13.8%.

[0062] Step S2: Immerse the cotton fabric in the eggshell membrane aqueous solution for 8 h. After sufficient immersion, take out the cotton fabric from the aqueous solution treatment liquid to obtain the immersed cotton fabric.

[0063] Step S3: Place the immersed cotton fabric in a vacuum drying oven at a temperature of 60 °C and dry for 2 h until the immersed cotton fabric is completely dry to obtain the piezoelectric sensing cotton fabric.

[0064] Step S4: Package the piezoelectric sensing cotton fabric with a double-sided conductive copper foil tape to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane with a thickness of 2 mm.

[0065] Effect verification:

[0066] For a better understanding of this application, the following analysis is made by taking the process parameters in the preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane provided in Example 2 as an example. Figures 2 to 5 ...

[0067] As Figure 2As shown, the scanning electron microscope images of pure cotton fabric and cotton fabric impregnated with eggshell membrane are presented. Among them, (a), (b), and (c) are the scanning electron microscope images of pure cotton fabric, and (a'), (b'), and (c') are the scanning electron microscope images of cotton fabric impregnated with eggshell membrane. It can be seen from the figure that the cotton fabric presents an intertwined coil network structure. The fiber surface of the pure cotton fabric is smooth, and there are relatively large void structures between the fibers. When impregnated with eggshell membrane, due to the strong hydrogen bond interaction between the eggshell membrane and cotton fibers, the eggshell membrane powder is well deposited on the surface of cotton fibers, and at the same time, the adhesion between the fibers is enhanced.

[0068] Table 1 below shows the comparison of the mechanical properties of cotton fabric before and after impregnation with eggshell membrane. The breaking strength, breaking tenacity, and elongation at break of the pure cotton fabric are 87 N, 1.74 N / mm, and 71.85% respectively, while those of the cotton fabric impregnated with eggshell membrane are increased to 121 N, 2.43 N / mm, and 78.32% respectively, showing excellent mechanical properties. This indicates that the prepared cotton fabric-based piezoelectric sensor has excellent stretchability.

[0069] Table 1:

[0070] Breaking strength (N) Breaking tenacity (N / mm) Elongation at break (%) Before impregnation of cotton fabric 87 1.74 71.85 After impregnation of cotton fabric 121 2.43 78.32

[0071] As Figure 3 shown, the mechanism diagram of the interaction between cotton fabric and eggshell membrane is presented. The composition of the cotton fabric is a network structure of cellulose. Multiple OH groups on glucose from one chain form hydrogen bonds with oxygen atoms of the same or adjacent chains, and fix the chains side by side. This helps to induce an appropriate dipole arrangement in the spin-asymmetric cellulose crystals, thus ensuring the maximum dipole moment under external mechanical stimuli. The piezoelectric properties of the eggshell membrane can be attributed to the chemical bonds of collagen. Collagen (I, V, X) is abundant in the eggshell membrane. The α-polypeptide is composed of repeating amino acids (glycine-proline-hydroxyproline) and is accompanied by a helical structure. Collagen I is formed by two α-1 chains and one α-2 chain. After the three α-chains are twisted together, type I collagen presents a triple helix structure. H bonds are formed between the amino and acyl groups in the same peptide chain or between peptide chains. In addition to the large number of hydrogen bonds in the cotton fabric and eggshell membrane itself, the hydrogen bonds formed between the two also further promote the piezoelectric performance of the sensor.

[0072] As Figure 4 shown, the Fourier transform infrared spectra of pure cotton fabric and cotton fabric impregnated with eggshell membrane are presented. The peak at 899 cm -1 in the pure cotton fabric represents the asymmetric stretching of C-O-C in cellulose. The peak at 1028 cm -1 represents the stretching of -C=O at C-6. The peak at 1053 cm -1The peak at [frequency] belongs to the stretching vibration of -C=O. 1107 cm -1 and the peaks at 1160 cm -1 correspond to the C-O stretching of the intra-chain ether and the C-C backbone stretching of cellulose molecules, respectively. 1205 cm -1 The broad and strong peak at [frequency] is characteristic of the in-plane stretching of -COH in cellulose during C-6 bending. 1281 cm -1 The strong peak at [frequency] is attributed to the vibrations of CH and OH. 1315 cm -1 and the peaks at 1335 cm -1 correspond to the vibrations of COH, HCC and OH, CH 2 vibrations, respectively. 1370 cm -1 The peak at [frequency] is due to the vibrations of COH and HCC in cellulose and hemicellulose. 1428 cm -1 The vibration peak appearing at [frequency] is caused by the vibrations of CH 2 , the in-plane bending of HCH and OCH, and the bending of intermolecular hydrogen bonds. 3335 cm -1 The broad and strong peak at [frequency] is characteristic of the -OH stretching in cellulose. 2900 cm -1 The sharp peak at [frequency] represents the stretching of the carbonyl -CH. Therefore, the infrared spectral structure analysis further supports the existence of the cellulose crystal structure. In the FT-IR spectrum of the cotton fabric impregnated with eggshell membrane, various strong absorptions and vibration peaks centered at 1529 and 1637 cm -1 appear, which are caused by the N-H bending coupled with C-N stretching, C=O stretching / hydrogen bond coupling with COO-, proving the existence of amide I band and amide II band, and further confirming the presence of eggshell membrane components in the fabric.

[0073] As Figure 5 shown, the piezoelectric performance test results of the cotton fabric before and after impregnation with eggshell membrane are presented. Under the excitation of a pressure of 30 N and a frequency of 1 Hz, the pure cotton fabric generates an output voltage of about 0.1 V, while the cotton fabric impregnated with eggshell membrane exhibits a voltage as high as about 0.25 V, proving that the piezoelectricity of the eggshell membrane itself and its strong hydrogen bond binding force with cellulose promote the piezoelectric output of the cotton fabric.

[0074] Based on the above-mentioned good mechanical properties and piezoelectric properties, the flexible cotton fabric-based piezoelectric sensor prepared in this application can be used to monitor human movements, such as small-amplitude movements like pulse beating, breathing, swallowing, finger bending, etc., and large-amplitude movements like knee bending, elbow bending, etc.; it can also be used to identify objects of different shapes and sizes; in addition, it can be used in the field of human-computer interaction, such as writing, speech recognition, etc., which helps to construct an intelligent handwriting recognition system for disabled patients.

[0075] In summary, the cotton fabric used in this application has a periodic coil network structure, which provides advantages for manufacturing sensors with good repeatability and high flexibility; the eggshell membrane used belongs to waste in the environment, reflecting the concept of resource recycling and environmental protection. At the same time, by utilizing the interaction between the abundant hydroxyl groups in the eggshell membrane and cellulose and the inherent piezoelectric sensitivity, the piezoelectric properties of the cellulose-based cotton fabric are improved; the preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane in this application is simple in operation, high in production efficiency, environmentally friendly, and can be mass-produced; the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane prepared in this application has good biocompatibility and degradability, generates a significant piezoelectric response under the excitation of small vibrations, can become an alternative source of green energy, and can be widely applied to the fields of human-computer interaction, human motion detection, and intelligent wearable devices.

[0076] The above are only the preferred embodiments of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane, characterized in that, it includes: A cotton fabric substrate with a periodic coil network structure; An eggshell membrane attached to the fabric substrate through an impregnation process, and the eggshell membrane interacts with fabric cellulose through hydrogen bonds; the piezoelectric sensor enhances piezoelectric performance through the interaction between the eggshell membrane and fabric cellulose; In the impregnation process, the concentration of the eggshell membrane aqueous solution is 10% to 15%; the temperature of vacuum drying is 50 to 60 °C; The eggshell membrane aqueous solution is obtained by dissolving eggshell membrane powder in water and stirring until it is fully dissolved; The cotton fabric impregnated with eggshell membrane is encapsulated with a double-sided conductive copper foil tape to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane.

2. The flexible cotton fabric-based piezoelectric sensor according to claim 1, characterized in that, The thickness of the flexible cotton fabric-based piezoelectric sensor is 2 to 3 mm.

3. The preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane according to claim 1 or 2, characterized in that, it includes the following steps: S1. Dissolve the eggshell membrane powder in an aqueous solution and stir until it is fully dissolved to obtain an eggshell membrane aqueous solution; S2. Add the cotton fabric into the eggshell membrane aqueous solution for sufficient impregnation, and after sufficient impregnation, take out the cotton fabric from the aqueous solution treatment liquid to obtain the impregnated cotton fabric; S3. Place the impregnated cotton fabric in a vacuum drying oven for drying until the impregnated cotton fabric is completely dry to obtain a piezoelectric sensing cotton fabric; S4. Use a double-sided conductive copper foil tape to encapsulate the piezoelectric sensing cotton fabric to obtain a flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane.

4. The preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane according to claim 3, characterized in that, In step S2: The impregnation time of the cotton fabric in the eggshell membrane aqueous solution is 6 to 8 h.

5. The preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane according to claim 3, characterized in that, In step S2: The impregnation temperature of the cotton fabric in the eggshell membrane aqueous solution is 25 to 30 °C.

6. The preparation method of the flexible cotton fabric-based piezoelectric sensor impregnated with eggshell membrane according to claim 3, characterized in that, In step S3: The drying time of the impregnated cotton fabric in the vacuum drying oven is 1 to 2 h.

7. The application of the flexible cotton fabric-based piezoelectric sensor according to claim 1 or 2 in the fields of human-computer interaction, human motion detection, and intelligent wearable.

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