Method for the production and use of integrated self-powered sensing fabrics

Abstract

The application discloses a preparation method and application of an integrated self-powered sensing fabric, and the integrated self-powered sensing fabric comprises a positive rubbing layer and a negative rubbing layer, the positive rubbing layer is knitted by a sensing yarn and a positive rubbing yarn, the sensing yarn comprises, from inside to outside, a glucose sensing inner core, a hydrophilic positive electric polymer nanofiber layer and a hydrophobic positive electric polymer nanofiber layer, and the positive rubbing yarn comprises, from inside to outside, a conductive inner core and a positive electric polymer nanofiber layer; the negative rubbing layer is knitted by a negative rubbing yarn. In the field of wearable sweat sensors, the application can convert mechanical energy generated by movement into electric energy in a low-frequency movement scene, and can realize sweat glucose detection in a short charging time.

Description

Technical Field

[0001] This invention relates to the field of fabrics, and more specifically to the preparation method and application of integrated self-powered sensing fabric. Background Technology

[0002] Wearable sweat sensors have attracted widespread attention due to their potential in non-invasive health monitoring. However, most human motion energy harvesters used in wearable sweat sensors suffer from low output power density, poor compatibility with sensing elements, and poor breathability, posing significant challenges to continuous sweat sensing. For example, Chinese patent CN109239152B discloses a method for preparing an electrochemical sensing fabric woven from sensing fibers, which uses a lithium-ion battery as a power source. Traditional power sources such as batteries have drawbacks such as requiring repeated charging and being non-deformable or non-degradable. Furthermore, existing wearable electronic devices for sweat sensing consist of two separate components: a power supply component and a sensing component for performing monitoring functions, which limits the integration and miniaturization of wearable electronic devices.

[0003] Therefore, there is an urgent need to develop an integrated self-powered electrochemical sensing fabric with high output power density, high sensitivity, high breathability and biodegradability to monitor the daily health status of the human body in real time and as well as for early disease detection and management. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing and applying an integrated self-powered sensing fabric. In the field of wearable sweat sensors, it converts the mechanical energy generated by movement into electrical energy in low-frequency motion scenarios, enabling the detection of glucose in sweat within a short charging time.

[0005] In one aspect of the invention, a negative friction yarn is provided. According to an embodiment of the invention, the negative friction yarn comprises, from the inside out, a conductive inner core and a layer of negatively charged polymer nanofibers, wherein the negatively charged polymer is a modified thermoplastic polyurethane (TPU) based on polycaprolactone (PCL).

[0006] In another aspect, the present invention provides a method for preparing negative friction yarn. According to an embodiment of the present invention, the method includes the following steps:

[0007] (1) Electronegative modified thermoplastic polyurethane was prepared by stepwise polymerization reaction and named electronegative PCLU-HFDD@WCNTs nanofiber layer.

[0008] (2) A negative friction yarn is formed by coating the outside of the conductive inner core with a layer of negatively charged PCLU-HFDD@WCNTs nanofibers through electrospinning process.

[0009] In addition, the method for preparing negative friction yarn according to the above embodiments of the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, in step (1), the raw materials in the stepwise polymerization reaction include diol, polyisocyanate, chain extender, catalyst, and organic solvent; in step (2), the electrospinning process uses fluoropolyurethane (PCLU-HFDD) spinning solution, and the concentration of the PCLU-HFDD spinning solution is 15wt% to 19wt%.

[0011] In some embodiments of the present invention, in the stepwise polymerization reaction, the diol is polycaprolactone-diol, the polyisocyanate is dicyclohexylmethylmethane-4, the chain extender is a fluorinated chain extender, the catalyst is dibutyltin dilaurate, and the organic solvent is one of tetrahydrofuran, ethyl acetate, and acetone. The above raw materials are mixed with carbon nanotubes (WCNTs) at a mass fraction of 18wt% to 22wt%, and the reaction is carried out at 50-55°C for 6-7 hours.

[0012] In another aspect of the invention, an integrated self-powered sensing fabric is proposed. According to an embodiment of the invention, it includes:

[0013] The positive friction layer is woven from sensing yarn and positive friction yarn. The sensing yarn includes, from the inside out, a glucose sensing core, a hydrophilic positively charged polymer nanofiber layer, and a hydrophobic positively charged polymer nanofiber layer. The positive friction yarn includes, from the inside out, a conductive core and a positively charged polymer nanofiber layer.

[0014] A negative friction layer, which is woven from the negative friction yarn.

[0015] In addition, the integrated self-powered sensing fabric according to the above embodiments of the present invention may also have the following additional technical features:

[0016] In some embodiments of the present invention, the average pore size of the hydrophilic positively charged polymer nanofiber layer is smaller than that of the hydrophobic positively charged polymer nanofiber layer.

[0017] In some embodiments of the present invention, the glucose sensing core is a conductive core deposited with a glucose sensing material, preferably a metal oxide glucose sensing material or an enzyme-based glucose sensing material, more preferably a metal oxide glucose sensing material; the conductive core can be a conventional conductive material in the art, preferably carbon fiber (CF), and more preferably, the conductive core is composed of multiple bundles of carbon fibers. A conductive core composed of multiple bundles of carbon fibers has a higher specific surface area, which is beneficial for depositing the sensing material and improving sensing sensitivity.

[0018] And / or, the polymers in the hydrophilic positively charged polymer nanofiber layer and the hydrophobic positively charged polymer nanofiber layer are flexible polymers with positive polarity in the triboelectric sequence;

[0019] And / or, the polymer in the negatively charged polymer nanofiber layer is a flexible polymer with negative polarity in the triboelectric sequence and its modified polymer;

[0020] In some embodiments of the present invention, the glucose sensing core is composed of multiple bundles of carbon fibers deposited with Cu2O. The method for applying Cu2O to the conductive core is to perform electrodeposition using a Cu-containing electrolyte. The preparation method of the Cu-containing electrolyte may include: mixing an aqueous solution of CuSO4·5H2O and a lactic acid solution, and then adding an aqueous solution of NaOH to adjust the pH to 10-11. The molar ratio of CuSO4·5H2O to lactic acid is (1-5):10, for example, 3:10. The electrodeposition conditions preferably include a current density of 2-3 mA cm⁻¹. -2 The deposition time is 10–20 min, for example, 15 min. Enzyme-based glucose sensing materials suffer from high immobilization costs, low sensitivity, and low stability, while Cu2O, as a glucose sensing material, offers advantages such as low cost, high sensitivity, selectivity, and long-term stability, making it superior to glucose oxidase.

[0021] And / or, the polymers in the hydrophilic positively charged polymer nanofiber layer and the hydrophobic positively charged polymer nanofiber layer are polylactic acid-glycolic acid copolymers; and / or, the polymers in the negatively charged polymer nanofiber layer are flexible polymers with negative polarity in the triboelectric sequence, such as polydimethylsiloxane.

[0022] In another aspect, the present invention proposes a method for preparing an integrated self-powered sensing fabric. According to an embodiment of the present invention, the method includes the following steps:

[0023] S1. A positively charged polymer nanofiber layer is coated on the outside of the glucose sensing core by electrospinning, followed by hydrophilic treatment to form a hydrophilic positively charged polymer nanofiber layer, and then coated with a hydrophobic positively charged polymer nanofiber layer to form a sensing yarn; the hydrophilic treatment is a conventional hydrophilic treatment method in the art, such as oxygen plasma treatment, and the oxygen plasma treatment time is preferably 5 to 10 minutes, for example 5 minutes.

[0024] S2. A hydrophobic positively charged polymer nanofiber layer is coated on the outside of the conductive core by electrospinning to form a positive friction yarn. The positive friction yarn and the sensing yarn are woven together to form a positive friction layer.

[0025] S3. Weave the negative friction yarns together to form a negative friction layer;

[0026] S4. The positive friction layer, negative friction layer, reference electrode yarn, and counter electrode yarn are woven and assembled together to obtain the integrated self-powered sensing fabric.

[0027] In addition, the method for preparing the integrated self-powered sensing fabric according to the above embodiments of the present invention may also have the following additional technical features:

[0028] In some embodiments of the present invention, the electrospinning process uses a polylactic acid-glycolic acid copolymer (PLGA) spinning solution. The concentration of the PLGA spinning solution for the hydrophilic positively charged polymer nanofiber layer is 13 wt% to 17 wt%, and the concentration of the PLGA spinning solution for the hydrophobic positively charged polymer nanofiber layer is 18 wt% to 22 wt%. In step S2, the electrospinning process uses a PLGA spinning solution with a concentration of 18 wt% to 22 wt%. Here, wt% represents the mass percentage of PLGA in the PLGA spinning solution.

[0029] The PLGA spinning solution is prepared by dissolving PLGA in a solvent. The solvent can be one or more of tetrahydrofuran, N,N-dimethylformamide, dichloroethane, ethyl acetate, acetone, and chlorobenzene, such as a mixture of tetrahydrofuran and N,N-dimethylformamide. When the solvent is a mixture of tetrahydrofuran and N,N-dimethylformamide, preferably, the volume ratio of tetrahydrofuran to N,N-dimethylformamide is (6-9):3, for example, 7:3.

[0030] The electrospinning process of the hydrophilic positively charged polymer nanofiber layer satisfies one or more of the following conditions (a)-(d):

[0031] (a) The spinning voltage is 14-16 kV, for example 15 kV;

[0032] (b) The spinning humidity is 45% RH to 55% RH, for example, 50% RH;

[0033] (c) The spinning temperature is 25–31°C, for example, 25°C;

[0034] (d) The spinning time is 10 to 12 hours, for example, 10 hours.

[0035] In the above embodiments, the electrospinning process of the hydrophobic positively charged polymer nanofiber layer satisfies one or more of the following conditions (a)-(d):

[0036] (a) The spinning voltage is 7-9 kV, for example 8 kV;

[0037] (b) The spinning humidity is 45% RH to 55% RH, for example, 50% RH;

[0038] (c) The spinning temperature is 25–31°C, for example, 25°C;

[0039] (d) The spinning time is 10 to 12 hours, for example, 10 hours.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] (1) This invention utilizes the high electronegativity of fluorine to introduce a fluorine-containing chain extender during the polymerization of thermoplastic polyurethane. The average surface potential of the prepared PCLU-HFDD yarn is as high as -68.5mV, which is 2 times higher than that of the unmodified yarn.

[0042] (2) The open-circuit voltage, short-circuit current and short-circuit charge generated by the TENG prepared by the present invention through rotational collection are much higher than those of the TENG prepared by the parallel collection method, and have higher output power (1.06mW). It can be monitored with an average charging time of only 21 seconds.

[0043] (3) The integrated self-powered sensing fabric prepared by this invention has higher sensitivity (38.25 mA·cm²) within the physiological range. -2 With its excellent reproducibility (·mM), it is effective in practical applications.

[0044] (4) The integrated self-powered sensing fabric prepared by the present invention can still maintain a high sweat collection efficiency after multiple washing and drying steps, and the output voltage of the sensing fabric remains stable during multiple washing cycle tests, with a retention rate close to 95%.

[0045] (5) The integrated self-powered sensing fabric prepared by the present invention is mainly composed of biodegradable materials. The outer shell of all yarns exhibits excellent biodegradability, enabling shell degradation and CFs recycling. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the integrated self-powered fabric prepared in Embodiment 3 of the present invention. In the figure, 1 is the sensing yarn, 2 is the counter electrode yarn, 3 is the reference electrode yarn, 4 is the negative friction layer, and 5 is the positive friction layer.

[0047] Figure 2 This is a SEM image of the negative friction yarn in Embodiment 1 of the present invention;

[0048] Figure 3 This is a SEM image of the negative friction yarn in Comparative Example 1 of the present invention;

[0049] Figure 4The output voltage of the integrated self-powered sensing fabric prepared in Example 3 and Comparative Example 2 of the present invention under the same test conditions;

[0050] Figure 5 The output current of the integrated self-powered sensing fabric prepared in Example 3 and Comparative Example 2 of the present invention under the same test conditions;

[0051] Figure 6 This is a graph showing the change in glucose concentration over time during the detection process in Example 3 of the present invention;

[0052] Figure 7 This is an infrared schematic diagram of the heated components in Embodiment 3 of the present invention;

[0053] Figure 8 This is a distribution diagram of charging time in Embodiment 3 of the present invention;

[0054] Figure 9 This is a comparison chart of sweat glucose concentration data for non-invasive monitoring using the integrated self-powered fabric of Example 3 of the present invention with blood glucose levels detected invasively.

[0055] Figure 10 This is a photograph of the degradation of positive and negative friction yarns in sodium hydroxide solution (pH=14) in Application Example 1 of the present invention. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0057] Carbon fiber bundles (TZ700S, 12K) were purchased from Weihai Guangwei Composite Materials Co., Ltd. Polylactic acid-glycolic acid copolymer (PLGA, MW=80000), polycaprolactone diol (PCL-diol, Mn=2000), dicyclohexylmethylmethane-4 (HMDI), dibutyltin dilaurate (DBTDL), hexadecylfluorodecanediol (HFDD), N,N-dimethylformamide (DMF), tetrahydrofuran (THF), sodium hydroxide (NaOH), copper sulfate pentahydrate (CuSO4·5H2O), phosphate buffered saline (PBS), uric acid, urea, tryptophan, tyrosine, sodium chloride (NaCl), ammonium chloride (NH4Cl), ascorbic acid, glucose, DL-lactic acid, polyvinyl butyral (PVB), and ethylene oxide block copolymer (Pluronic F-127) were all purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0058] Ag / AgCl slurry was purchased from Shanghai Julong Electronic Technology Co., Ltd., and multi-walled carbon nanotubes (MWCNTs, 8-15nm, >95%) were provided by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences.

[0059] Example 1

[0060] A PCLU-HFDD@WCNTs negative friction yarn, the preparation method of which includes the following steps:

[0061] (1) Synthesis of PCLU-HFDD@WCNTs: The raw materials are 5g of PCL-diol, 2.22g of dicyclohexylmethylmethane-4 (HMDI), 2.31g of fluorinated chain extender (HFDD), and 20 μL of dibutyltin dilaurate (DBTDL). The organic solvent used in the reaction is 30mL of tetrahydrofuran (THF). Finally, it is mixed with WCNTs with a mass fraction of 20wt%.

[0062] (2) Prepare a solution by mixing tetrahydrofuran and N,N-dimethylformamide in a volume ratio of 7:3 to obtain a spinning solution of PCLU-HFDD@WCNTs 20 wt%.

[0063] (3) Fix CFs (carbon fibers) on the rotating collector of an electrospinning machine, use 20wt% spinning solution, and spin for 10h at 8kv, 50%rh and 25℃ to obtain PCLU-HFDD@WCNTs negative friction yarn.

[0064] Example 2

[0065] The method for preparing the positive friction layer includes the following steps:

[0066] (1) Preparation of Janus sensing yarn

[0067] In an electrolytic cell, 0.3 mol / L CuSO4·5H2O and 1 mol / L lactic acid solution were mixed, and then 5 mol / L NaOH aqueous solution was added to adjust the pH of the electrolyte to 11, maintaining a current density of 2 mA·cm⁻¹. -2Cu2O-CF was placed in a CF substrate and deposited for 15 min before drying. Two solutions were prepared by mixing tetrahydrofuran and N,N-dimethylformamide in a volume ratio of 7:3. Appropriate amounts of PLGA were dissolved in each solution to obtain a 13 wt% spinning solution. The Cu2O-CF was fixed on the rotating collector of an electrospinning machine. Spinning was performed for 10 h at 15 kV, 50% RH, and 25 °C using the 13 wt% spinning solution. After removal, oxygen plasma treatment was performed for 5 min to coat the outside of the Cu2O-CF with a hydrophilic PLGA nanofiber layer. The resulting product was fixed on an electrospinning machine, and then spun for 2 h at 15 kV, 50% RH, and 25 °C using the 13 wt% spinning solution to coat the outside with a hydrophobic PLGA nanofiber layer, thus obtaining the sensing yarn.

[0068] (2) Preparation of positive friction yarn

[0069] The CF was fixed on the rotating collector of the electrospinning machine. First, a 20wt% PLGA spinning solution was used to spin the yarn for 10 hours at a voltage of 8kV to obtain positive friction yarn.

[0070] (3) The positive triboelectric yarn and the sensing yarn are woven together to form a positive triboelectric layer.

[0071] The negative friction yarn prepared in Example 1 and the positive friction yarn prepared in Example 2 were placed in a sodium hydroxide solution (pH = 14) for degradation, and the results are as follows. Figure 10 As shown, after 2 hours, the polymer shells of both positive and negative friction yarns are damaged, and CF can be recycled and reused.

[0072] Example 3

[0073] The preparation method of the integrated self-powered sensing fabric includes the following steps:

[0074] (1) Preparation of Janus reference electrode yarn

[0075] Ag / AgCl slurry was coated onto CF (carbon fiber) and dried in a 60℃ oven to obtain Ag / AgCl-CF. Ag / AgCl-CF was fixed on the rotating collector of an electrospinning machine. First, a 15wt% spinning solution was used to spin at 15kV for 10 hours. After removal, it was subjected to oxygen plasma treatment for 5 minutes, and then a 20wt% spinning solution was used to spin at 8kV for 2 hours to obtain Janus reference electrode yarn.

[0076] (2) Preparation of Janus electrode yarn

[0077] The CF was fixed on the rotating collector of the electrospinning machine. First, a 15 wt% spinning solution was used to spin for 10 h at a voltage of 15 kV. After removal, it was subjected to oxygen plasma treatment for 5 min. Then, a 20 wt% spinning solution was used to spin for 2 h at a voltage of 8 kV to obtain the Janus counter electrode yarn.

[0078] (3) Preparation of integrated self-powered sensing fabric

[0079] The negative triboelectric yarns obtained in Example 1 are woven together to form a negative triboelectric layer 4. Then, the reference electrode yarn 3, the counter electrode yarn 2, and the positive triboelectric layer 5 (formed by weaving the positive triboelectric yarns and the sensing yarn 1 into one layer) prepared in Example 2 are woven together. Finally, the negative triboelectric layer 4 and the positive triboelectric layer 5 are sewn together at the edges using an embroidery process to obtain an electrochemical fabric, the structure of which is as follows. Figure 1 As shown.

[0080] like Figure 8 As shown, the integrated self-powered sensing fabric has a higher output power (1.06mW) and can be monitored with an average charging time of only 21 seconds.

[0081] Comparative Example 1

[0082] This comparative example provides a PCLU-HFDD@WCNTs negative friction sensing yarn, the preparation method of which includes the following steps:

[0083] (1) Prepare a solution by mixing tetrahydrofuran and N,N-dimethylformamide in a volume ratio of 7:3, and dissolve the PCLU-HFDD@WCNTs prepared in Example 1 in the solution to obtain a 20wt% spinning solution.

[0084] (2) Using a 20wt% spinning solution, the fiber was spun for 10 hours at 8kv, 50%rh and 25℃ and collected on a flat plate collector. The fiber was then wrapped on CFs to obtain a flat plate collection negative friction layer sensing yarn.

[0085] The performance of the negative triboelectric yarns in Example 1 and Comparative Example 1 was tested using a Keithley 2400 triboelectric nanogenerator testing system. The obtained SEM images are shown below. Figure 2 and 3 As shown, the surface roughness of the yarn in Example 1 is rougher than that in Comparative Example 1.

[0086] Comparative Example 2

[0087] The integrated self-powered sensing fabric differs from Example 3 in that the negative friction yarn is obtained by the method of Comparative Example 1, while the other steps are the same as in Application Example 1.

[0088] The integrated self-powered sensing fabrics obtained in Example 3 and Comparative Example 2 were subjected to the following performance tests:

[0089] 1. The integrated self-powered sensing fabrics obtained in Example 3 and Comparative Example 2 were used to test their output performance using a triboelectric nanogenerator testing system. Figure 4 and 5 As shown, Application Example 1, based on rotating current-collecting yarn, generates an open-circuit voltage (Voc) and a short-circuit current (Isc) of 117.08V and 9.85μA, respectively, at a frequency of 5Hz. In contrast, under the same test conditions, Comparative Example 2, based on parallel collecting yarn, only exhibits Voc and Isc of 25.41V and 1.04μA, respectively.

[0090] 2. Take the integrated self-powered sensing fabric obtained in Example 3, and connect the three electrodes to a portable electrochemical workstation using wires. Use PBS solution to simulate the human sweat environment, and continuously add glucose solutions of different concentrations. Collect the current and fit the relationship curve between concentration and current as shown in the figure. Figure 6 As shown (each concentration was tested 5 times), the electrochemical fabric sensitivity was 3824.88 mA·cm⁻¹ in the glucose concentration range of 3–120 μM. -2 ·mM -1 This demonstrates that the integrated self-powered sensing fabric prepared using Example 3 has high sensitivity.

[0091] 3. The positive friction layer prepared in Example 1 was subjected to a working voltage of 2.00V and a pressure of 0.0075W / cm. 2 Heating was performed at low power density, and the infrared image after heating is shown below. Figure 7 As shown, the superhydrophobic heating electrode substrate prepared in Example 1 was subjected to an operating voltage of 2.00V and a current of 0.0075W / cm². 2 At low power density, the temperature can reach 50.1℃, which is far higher than the threshold of 42℃ for heat-stimulated skin perspiration. Therefore, electric heating can stimulate skin perspiration and improve sweat collection efficiency.

[0092] 4. Volunteers simultaneously wore the integrated self-powered sensing fabric prepared in Example 3 and a commercially available portable blood glucose meter. The non-invasively monitored sweat glucose concentration data was compared with the invasively detected blood glucose levels. The comparison results are as follows: Figure 9 As shown, the trend of changes in sweat glucose concentration monitored by the integrated sensing fabric is the same as that of the portable blood glucose meter.

[0093] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A negative friction yarn, characterized in that: The negative friction yarn comprises, from the inside out, a conductive inner core and a layer of negatively charged polymer nanofibers. The negatively charged polymer is a modified thermoplastic polyurethane based on polycaprolactone. The raw materials for preparing the modified thermoplastic polyurethane based on polycaprolactone include polycaprolactone-diol, polyisocyanate, chain extender, catalyst, and organic solvent. The chain extender is a fluorinated chain extender.

2. A method for preparing the negative friction yarn according to claim 1, characterized in that, Includes the following steps: (1) A negatively modified thermoplastic polyurethane was prepared by stepwise polymerization reaction and named negatively modified PCLU-HFDD@WCNTs. The raw materials in the stepwise polymerization reaction included polycaprolactone-diol, polyisocyanate, chain extender, catalyst, and organic solvent. The chain extender was a fluorinated chain extender. (2) Negative friction yarn is formed by coating the outer side of the conductive inner core with negatively charged PCLU-HFDD@WCNTs through electrospinning process.

3. The method for preparing negative friction yarn according to claim 2, characterized in that: In step (2), the electrospinning process uses a fluorinated polyurethane spinning solution with a concentration of 15 wt% to 19 wt%.

4. The method for preparing negative friction yarn according to claim 2, characterized in that: In the stepwise polymerization reaction, the polyisocyanate is 4,4'-dicyclohexylmethane diisocyanate, the catalyst is dibutyltin dilaurate, and the organic solvent is one of tetrahydrofuran, ethyl acetate, and acetone. The above raw materials are mixed with carbon nanotubes at a mass fraction of 18 wt% to 22 wt%, and the reaction is carried out at 50-55 °C for 6-7 hours.

5. An integrated self-powered sensing fabric, characterized in that, include: A positive friction layer is formed by weaving sensing yarn and positive friction yarn. The sensing yarn includes, from the inside out, a glucose sensing core, a hydrophilic positively charged polymer nanofiber layer, and a hydrophobic positively charged polymer nanofiber layer. The positive friction yarn includes, from the inside out, a conductive core and a positively charged polymer nanofiber layer. A negative friction layer, wherein the negative friction layer is woven from the negative friction yarn as described in claim 1.

6. The integrated self-powered sensing fabric according to claim 5, characterized in that: The average pore size of the hydrophilic positively charged polymer nanofiber layer is smaller than that of the hydrophobic positively charged polymer nanofiber layer.

7. The integrated self-powered sensing fabric according to claim 6, characterized in that: The glucose sensing core is a conductive core on which glucose sensing material is deposited. And / or, the polymers in the hydrophilic positively charged polymer nanofiber layer and the hydrophobic positively charged polymer nanofiber layer are flexible polymers with positive polarity in the triboelectric sequence.

8. The integrated self-powered sensing fabric according to claim 6, characterized in that: The glucose sensing core is composed of multiple bundles of carbon fibers deposited with Cu2O. And / or, the polymer in the hydrophilic positively charged polymer nanofiber layer and the hydrophobic positively charged polymer nanofiber layer is a polylactic acid-glycolic acid copolymer.

9. A method for preparing the integrated self-powered sensing fabric as described in claim 5, characterized in that, Includes the following steps: S1. A positively charged polymer nanofiber layer is coated on the outside of the glucose sensing core by electrospinning process, and then hydrophilic treatment is performed to form a hydrophilic positively charged polymer nanofiber layer. A hydrophobic positively charged polymer nanofiber layer is then coated to form a sensing yarn. S2. A hydrophobic positively charged polymer nanofiber layer is coated on the outside of the conductive core by electrospinning to form a positive friction yarn. The positive friction yarn and the sensing yarn are woven together to form a positive friction layer. S3. Weave the negative friction yarns together to form a negative friction layer; S4. The positive friction layer, negative friction layer, reference electrode yarn, and counter electrode yarn are woven and assembled together to obtain the integrated self-powered sensing fabric.

10. The method for preparing the integrated self-powered sensing fabric according to claim 9, characterized in that: In step S1, the electrospinning process uses a polylactic acid-glycolic acid copolymer spinning solution. The concentration of the polylactic acid-glycolic acid copolymer spinning solution for the hydrophilic positively charged polymer nanofiber layer is 13 wt% to 17 wt%, and the concentration of the polylactic acid-glycolic acid copolymer spinning solution for the hydrophobic positively charged polymer nanofiber layer is 18 wt% to 22 wt%. In step S2, the electrospinning process uses a polylactic acid-glycolic acid copolymer spinning solution with a concentration of 18 wt% to 22 wt%.

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