Woven-loop intelligent fabric based on triboelectric nanogenerator and application thereof

Abstract

The application relates to a warp-knitted loop intelligent fabric based on a friction nanogenerator and application thereof, and relates to the field of intelligent textiles. The warp-knitted loop intelligent fabric comprises a fabric pile surface in contact with external substances and a fabric base cloth not in contact with external substances; the fabric pile surface is a triboelectric layer of the warp-knitted loop intelligent fabric, and the fabric base cloth is an electrically-conductive layer and a supporting layer of the warp-knitted loop intelligent fabric; wherein the fabric pile surface is a warp-knitted loop structure. The mature warp-knitting process is combined with the emerging friction nanogenerator in the application, the advantages of both are fully utilized, compared with traditional wearable smart products, the warp-knitted loop intelligent fabric provided by the application can meet self-powered sensing and monitoring, has better flexibility and air permeability, has the body-fitting property and use comfort of the textile itself, and the problem of power supply safety of the traditional wearable smart product is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent fabric, and particularly relates to a warp loop intelligent fabric based on a triboelectric nanogenerator and application thereof. BACKGROUND

[0002] With the rapid development of the Internet of Things technology and social economy, intelligent electronic products have attracted widespread attention, especially in the wearable field, which has been integrated into people's work, study and daily life. However, there are still many problems in the compatibility of use comfort and sensing intelligence of traditional wearable intelligent products, resulting in heavy equipment, poor air permeability, discomfort, and inability to realize true flexible wearable. In addition, due to excessive dependence on fossil fuels such as oil and coal and overexploitation of non-renewable resources, energy crisis and environmental pollution problems have become a great obstacle to the sustainable development of future society. The triboelectric nanogenerator, which has the advantages of wide material selectivity, simple structure and high energy conversion efficiency, is considered to be one of the important solutions to the above problems.

[0003] The triboelectric nanogenerator converts the scattered mechanical energy in life, which is not valued by people, into electrical energy through the coupling effect of triboelectricity, electrostatic induction and displacement current, and provides a new solution for people to alleviate the current energy shortage problem as a clean energy source for other electronic devices or as a self-powered sensor. Combining the triboelectric nanogenerator with textile technology to weave a textile-based triboelectric nanogenerator is also an effective way to improve the use comfort of wearable products. According to existing research, textile-based triboelectric nanogenerators can be mainly divided into two categories according to the processing technology: yarn-based triboelectric nanogenerators that use yarn as a unit for separate sensing and fabric-based triboelectric nanogenerators that use the whole fabric as a sensing unit.

[0004] The fabric-based triboelectric nanogenerator can be further divided into three types according to the processing technology: knitted triboelectric nanogenerators, woven triboelectric nanogenerators and non-woven triboelectric nanogenerators. Compared with woven triboelectric nanogenerators and non-woven triboelectric nanogenerators, knitted triboelectric nanogenerators stand out due to their strong raw material adaptability, soft fabric texture, good elasticity, air permeability and wrinkle resistance, and have attracted widespread attention. According to the direction of yarn feeding machine, knitted triboelectric nanogenerators can be divided into two categories: weft-knitted triboelectric nanogenerators and warp-knitted triboelectric nanogenerators. Compared with weft-knitted triboelectric nanogenerators, warp-knitted triboelectric nanogenerators have good dimensional stability and high production efficiency, and are more suitable for future commercial large-scale production.

[0005] As a common textile, warp-knitted terry fabric not only has excellent comfort performance, good dimensional stability, high production efficiency and other advantages, but also has a larger specific surface area compared with other types of fabrics, so it has a larger output when generating electricity by rubbing with external substances. However, warp-knitted triboelectric nanogenerators are still relatively rare at present, and warp-knitted terry triboelectric nanogenerators are even more rare. SUMMARY

[0006] The purpose of the present application is to provide a warp-knitted terry smart fabric based on a triboelectric nanogenerator and its application, in order to solve the problems of poor fit performance, poor comfort performance, and safety hazards of external power supply of current wearable electronic products.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0008] On the one hand, the present application provides a warp-knitted terry smart fabric based on a triboelectric nanogenerator, which comprises a fabric pile surface in contact with external substances and a fabric base cloth not in contact with external substances.

[0009] The fabric pile surface is the triboelectric layer of the warp-knitted terry smart fabric, and the fabric base cloth is the conductive layer and support layer of the warp-knitted terry smart fabric.

[0010] Among them, the fabric pile surface is a warp-knitted terry structure.

[0011] In one possible implementation, the fabric pile surface is in contact with an external rubbing layer, and the fabric base cloth is connected to an external electronic device through a wire.

[0012] In one possible implementation, the warp-knitted terry smart fabric is woven by a terry warp knitting machine, and the terry warp knitting machine at least includes a guide bar GB1, a guide bar GB2 and a guide bar GB3.

[0013] The warp-knitted terry structure of the fabric pile surface is formed by using the guide bar GB1 to weave by the loop-dropping method. In order to make the yarns woven to form terry loops fall off from the guide bar GB1 during knitting, the guide bar GB1 is used to thread the yarns in a one-thread-one-empty manner, and an auxiliary pulling mechanism is used in the post-finishing process to make the terry loop part fluffy and uniform.

[0014] In one possible implementation, the fabric base cloth is woven by the guide bar GB2 and the guide bar GB3, and the guide bar GB2 and the guide bar GB3 both use a one-empty-one-thread threading method.

[0015] In one possible implementation, the fabric pile surface is woven by using chemical fibers or natural fibers that are not conductive and have strong dielectric properties.

[0016] In a possible implementation, the raw yarn used by the fabric pile comprises one of polyester, nylon, polytetrafluoroethylene fiber, polypropylene, wool, and silk.

[0017] In a possible implementation, the fabric base cloth uses a conductive yarn capable of conducting electricity and having good tensile strength and flexibility.

[0018] In a possible implementation, the raw yarn used by the fabric base cloth comprises one of silver-plated nylon and silver-plated polyester.

[0019] In another aspect, the application further provides an application of the warp-knitted terry-loop smart fabric based on the triboelectric nanogenerator in the field of clean energy collection, for powering electronic products.

[0020] In another aspect, the application further provides an application of the warp-knitted terry-loop smart fabric based on the triboelectric nanogenerator in the field of flexible sensing, for human motion monitoring.

[0021] The technical scheme provided by the application has at least the following beneficial effects:

[0022] The application combines the mature warp-knitting process with the emerging triboelectric nanogenerator, fully utilizes the advantages of both, and compared with the traditional wearable smart product, the warp-knitted terry-loop smart fabric provided by the application has better flexibility and air permeability while meeting the requirements of self-powered sensing and monitoring, has the body-fitting property and use comfort of the textile itself, and avoids the problem of power safety of the traditional wearable product.

[0023] In addition, compared with other textiles such as weft-knitted fabric, the warp-knitted terry-loop fabric has good dimensional stability and excellent warmth retention, can meet the requirements of normal repeated use and use in cold environments, the warp-knitted terry-loop smart fabric provided by the application retains the advantages of easy processing and high production efficiency of the warp-knitted fabric, and has the characteristics of wide selection of raw materials and low cost of the triboelectric nanogenerator, thus has the potential for large-scale manufacturing and is very suitable for commercial production.

[0024] The terry-loop fabric has a relatively fluffy surface, and compared with flat and non-terry-loop fabric, the terry-loop fabric has a larger contact area with the outside world, and the terry-loop fabric has stronger triboelectric charging capacity. Due to this feature, the warp-knitted terry-loop smart fabric provided by the application has larger triboelectric output and higher output power when powering itself or other electronic devices. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are meant to explain the application, but are not intended to limit the application. In the drawings:

[0026] Figure 1 A structural schematic diagram of the warp-knitted looped pile smart fabric based on the triboelectric nanogenerator is shown according to an example embodiment of the application;

[0027] Figure 2 A working schematic diagram of the warp-knitted looped pile smart fabric based on the triboelectric nanogenerator in the horizontal sliding operation mode is shown according to an example embodiment of the application;

[0028] Figure 3 A working schematic diagram of the warp-knitted looped pile smart fabric based on the triboelectric nanogenerator in the vertical contact-separation operation mode is shown according to an example embodiment of the application;

[0029] Figure 4 An open-circuit voltage condition schematic diagram of the warp-knitted looped pile smart fabric in the horizontal sliding operation mode is shown according to the second embodiment of the application;

[0030] Figure 5 A short-circuit current condition schematic diagram of the warp-knitted looped pile smart fabric in the horizontal sliding operation mode is shown according to the second embodiment of the application;

[0031] Figure 6 A short-circuit charge condition schematic diagram of the warp-knitted looped pile smart fabric in the horizontal sliding operation mode is shown according to the second embodiment of the application;

[0032] Figure 7 A voltage condition schematic diagram of the warp-knitted looped pile smart fabric charging a 4.7 μF capacitor in the horizontal sliding operation mode is shown according to the second embodiment of the application;

[0033] Figure 8 A schematic diagram of the warp-knitted looped pile smart fabric supplying energy to an LED small light in the horizontal sliding operation mode is shown according to the third embodiment of the application;

[0034] Figure 9 A schematic diagram of the warp-knitted looped pile smart fabric supplying energy to a calculator in the horizontal sliding operation mode is shown according to the fourth embodiment of the application;

[0035] Figure 10 An open-circuit voltage condition schematic diagram of the warp-knitted looped pile smart fabric in the vertical contact-separation operation mode is shown according to the fifth embodiment of the application;

[0036] Figure 11 A short-circuit current condition schematic diagram of the warp-knitted looped pile smart fabric in the vertical contact-separation operation mode is shown according to the fifth embodiment of the application;

[0037] Figure 12 This diagram illustrates the short-circuit charge situation of the warp-knitted terry smart fabric in the vertical contact-separation motion operation mode according to Embodiment 5 of this application;

[0038] Figure 13 This diagram illustrates the pressure sensitivity of the warp-knitted terry smart fabric in the vertical contact-separation motion operation mode in Embodiment 5 of this application.

[0039] Figure 14 This illustration shows a schematic diagram of a warp-knitted terry smart fabric installed on the sole of the foot in a vertical contact-separation motion operation mode to monitor the human body's motion status in Embodiment 5 of this application.

[0040] Figure 15 This diagram illustrates the use of a warp-knitted terry smart fabric for human arm swing monitoring in the vertical contact-separation motion operation mode according to Embodiment Six of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] Figure 1 This illustration shows a structural principle diagram of a warp-knitted terry smart fabric based on a triboelectric nanogenerator provided in an exemplary embodiment of this application. The warp-knitted terry smart fabric includes a fabric pile surface 1 that is in contact with external materials and a fabric base 2 that is not in contact with external materials. The fabric pile surface 1 is the triboelectric layer of the warp-knitted terry smart fabric and needs to have a strong triboelectric capability. The fabric base 2 is the conductive layer and support layer of the warp-knitted terry smart fabric. The fabric pile surface 1 is a warp-knitted terry structure.

[0045] In an optional embodiment, please refer to Figure 1 The fabric pile 1 is in contact with the external friction layer 3, and the fabric base 2 is connected to the external electronic device 4 through a wire.

[0046] In some embodiments, the warp-knitted looped smart fabric is knitted by a loop warp knitting machine, which at least includes a guide bar GB1, a guide bar GB2 and a guide bar GB3. The warp-knitted looped structure of the fabric pile 1 is knitted by the guide bar GB1 using a loop shedding method. In order to make the yarns of the warp-knitted looped structure fall off from the guide bar GB1 and form loops during knitting, the guide bar GB1 is threaded with one empty and one full yarn, and an auxiliary pulling mechanism is used in the post-finishing process to make the looped part fluffy and uniform. The fabric base cloth 2 is knitted by the guide bar GB2 and the guide bar GB3, and both the guide bar GB2 and the guide bar GB3 are threaded with one empty and one full yarn.

[0047] Optionally, the fabric pile 1 is knitted by using chemical fibers or natural fibers that are not conductive and have strong dielectric properties. Preferably, the raw yarns used for the fabric pile 1 include but are not limited to one of polyester, nylon, polytetrafluoroethylene fiber, polypropylene, wool and silk.

[0048] Further, the fabric base cloth 2 is knitted by using conductive yarns that can conduct electricity and have good tensile strength and flexibility. Preferably, the raw yarns used for the fabric base cloth 2 include but are not limited to one of silver-plated nylon and silver-plated polyester.

[0049] It should be noted that the warp-knitted looped smart fabric based on the triboelectric nanogenerator provided in the present application not only has excellent human body fitting performance and use comfort performance, but also can realize strong self-power output. It can be applied in the field of clean energy collection to supply energy for electronic products, and can also be applied in the field of flexible sensing to monitor human body movement.

[0050] In the embodiments of the present application, the mature warp knitting process is combined with the emerging triboelectric nanogenerator, the advantages of both are fully utilized, compared with the traditional wearable products, the warp-knitted looped pile intelligent fabric provided by the present application has better flexibility and air permeability while meeting the self-powered sensing and monitoring, has the body fit and use comfort of the textile itself, and avoids the problem of power safety of the traditional wearable products; in addition, compared with other textiles such as weft-knitted fabrics, the warp-knitted looped pile fabric has better dimensional stability and excellent warmth retention, and can meet the requirements of normal repeated use and use in cold environments, the warp-knitted looped pile intelligent fabric provided by the present application retains the advantages of easy processing and high production efficiency of warp-knitted fabrics, and has the characteristics of wide selection of raw materials and low cost of triboelectric nanogenerator, so it has the potential for large-scale manufacturing and is very suitable for commercial production; wherein, the surface of the looped pile fabric is relatively fluffy, when in contact with the outside world, compared with flat and non-wool fabrics, the wool on the surface of the looped pile fabric has a larger contact area with the outside world, and the friction electrification ability of the looped pile fabric with the outside world is stronger, due to this characteristic, the warp-knitted looped pile intelligent fabric provided by the present application has larger triboelectric output, and has higher output power when powering itself or other electronic devices.

[0051] In order to better understand the present application, the present application will be further described below in combination with the drawings and five specific embodiments. It should be noted that the following embodiment two to embodiment six test the triboelectric output of the warp-knitted looped pile intelligent fabric based on the triboelectric nanogenerator provided by the present application, the instruments used in the test are shown in the following table:

[0052] Instrument name Instrument model Manufacturer Loop machine KS4-FBZ Karl Mayer (China) Co., Ltd. Linear motor E1100 LinMot Electrometer 6514 Keithley Pressure sensor DYLY-108 Shenzhen Yangge Technology Co., Ltd.

[0053] In detail, the reverse side of the warp-knitted looped pile intelligent fabric is pasted to the acrylic plate, and the acrylic plate is fixed on the pressure sensor for monitoring the pressure change of the warp-knitted looped pile intelligent fabric during work; the other side of the warp-knitted looped pile intelligent fabric is the external friction layer, and the two are arranged in parallel; the external friction layer is fixed on a linear motor capable of linear motion and adjustable motion distance and motion speed; by controlling the motion of the linear motor, the external friction layer and the warp-knitted looped pile intelligent fabric are subjected to periodic horizontal sliding or vertical contact-separation motion. During the work, the electrodes of the warp-knitted looped pile intelligent fabric are connected with the electrometer to collect the electrical signal output (open circuit voltage, short circuit current and short circuit charge) of the fabric, and the real-time collected electrical signal is converted into more intuitive digital signal on the LabVIEW platform.

[0054] The working principle of the warp-knitted looped pile intelligent fabric subjected to periodic horizontal sliding and vertical contact-separation motion is described below.

[0055] Horizontal sliding operation mode working principle:

[0056] In the horizontal sliding operation mode, the working principle of the warp-knitted terry intelligent fabric is shown in Figure 2 The initial state is shown in Fig. 1, in which the warp-knitted terry intelligent fabric is not charged, and each part is electrically neutral. Under the action of external force, the warp-knitted terry intelligent fabric is in contact with the external friction layer and performs periodic horizontal sliding movement. Due to the different electron affinity of different materials, the two materials are tribocharged when sliding horizontally, and electron transition occurs between the contact surfaces, resulting in different polar static charges of the two materials, as shown in Fig. 2. At this time, the whole warp-knitted terry intelligent fabric is in electrostatic equilibrium state. Figure 2 Figure 2 When the warp-knitted terry intelligent fabric and the external friction layer begin to slide and separate under the action of external force, as shown in Fig. 3, a potential difference occurs between the contact surfaces of the materials, and the electrode potential changes. If the electrode is connected to the external circuit at this time, due to the potential difference between the electrode of the warp-knitted terry intelligent fabric and the outside, the free electrons in the electrode move, thereby generating a directional moving current in the external circuit. When the warp-knitted terry intelligent fabric and the external friction layer slide and separate to a certain distance, the static charges generated by friction are balanced by the induced charges of the back electrode, and the charge flow in the external circuit stops, as shown in Fig. 4. Figure 2 Figure 2 When the warp-knitted terry intelligent fabric and the external friction layer are driven to start sliding and contacting again under the action of external force, as shown in Fig. 5, the gap between the two materials decreases, the electrostatic equilibrium state is broken, the potential difference between the contact surfaces of the materials changes again, and the electrons begin to flow in the opposite direction. If the external circuit is connected, due to the change of the electrode potential difference, the potential difference between the electrode and the electrode at the other end of the external circuit appears again, and the current in the external circuit flows in the opposite direction. When the warp-knitted terry intelligent fabric and the external friction layer are in full contact, the charge balance between the two layers occurs again, and the charge flow in the external circuit stops at this time.

[0057] The working principle of the vertical contact-separation movement operation mode is as follows:

[0058] In the vertical contact-separation movement operation mode, the working principle of the warp-knitted terry intelligent fabric is shown in Fig. 6. The working principle is basically the same as that of the horizontal sliding operation mode described above, except that the relative movement direction of the warp-knitted terry intelligent fabric and the external friction layer is different. Figure 3

[0059] ​​​In addition, in the following Embodiment Two to Embodiment Six, the woven tricot terry intelligent fabric is all woven by the above-mentioned tricot terry loom. The tricot terry loom includes a guide bar GB1, a guide bar GB2 and a guide bar GB3. The tricot terry structure of the fabric pile surface is formed by the guide bar GB1 using the loop-dropping method. The fabric base cloth is woven by the guide bar GB2 and the guide bar GB3. The guide bar GB1 uses the one-thread-one-empty method to thread the yarn. The guide bar GB2 and the guide bar GB3 both use the one-empty-one-thread method to thread the yarn. Specifically,

[0060] GB1: 3-4 / 1-0 / / one-thread-one-empty;

[0061] GB2: 0-1 / 1-0 / / one-empty-one-thread;

[0062] GB3: 5-5 / 0-0 / / one-empty-one-thread.

[0063] It is worth noting that the following Embodiment Two, Embodiment Three and Embodiment Four are realized as the external friction layer and the tricot terry intelligent fabric do periodic horizontal sliding. They are applied in the field of clean energy collection and used to power electronic products. The following Embodiment Five and Embodiment Six are realized as the external friction layer and the tricot terry intelligent fabric do periodic vertical contact-separation motion. They are applied in the field of flexible sensing and used for human motion monitoring.

[0064] Embodiment Two

[0065] In this embodiment, the fabric pile surface uses non-conductive yarn, which is 160D polyester yarn. The fabric base cloth uses conductive yarn, which is 100D silver-plated nylon 66 yarn. The external friction layer is a polytetrafluoroethylene (PTFE) film. The woven tricot terry intelligent fabric (about 50x50mm 2 ) is placed on the external friction layer. The fabric pile surface part is in contact with the external friction layer, and the fabric base cloth part is connected to the electrometer through a lead wire.

[0066] Effect test: The tricot terry intelligent fabric woven in this embodiment is tested for triboelectric output. The tricot terry intelligent fabric is reciprocally horizontally slid on the polytetrafluoroethylene film at a speed of 100mm / s and a sliding distance of 50mm. In detail, please refer to Figure 4 , the open-circuit voltage in the working cycle reached about 170V; please refer to Figure 5 , the short-circuit current reached about 225nA; please refer to Figure 6 , the short-circuit charge reached about 58nC.

[0067] In addition, by connecting the tricot terry intelligent fabric woven in this embodiment to a rectifier, the alternating current generated by the operation of the tricot terry intelligent fabric is converted into direct current, and a capacitor is charged. After testing, please refer to Figure 7Within 360 seconds, the warp-knitted terry smart fabric woven using this embodiment can charge a 4.7μF capacitor to 9V.

[0068] Example 3

[0069] In this embodiment, the fabric pile surface uses 160D non-conductive polyester yarn, while the fabric base uses 100D silver-plated nylon 66 conductive yarn. The outer friction layer is a polytetrafluoroethylene (PTFE) film.

[0070] like Figure 8 As shown, the completed warp-knitted terry smart fabric (size 80×90mm) will be displayed. 2 Placed on the outer friction layer, with the fabric pile side in contact with the outer friction layer, this 8×9cm piece is manually driven. 2 The warp-knitted terry smart fabric reciprocates horizontally to power the LED lights, ultimately successfully lighting up 496 LED lights connected in series.

[0071] Example 4

[0072] In this embodiment, the pile surface of the fabric uses 160D non-conductive polyester yarn, while the base fabric uses 100D silver-plated nylon 66 conductive yarn. The outer friction layer is a polytetrafluoroethylene (PTFE) film. Due to the working principle of triboelectric nanogenerators, the output of the warp-knitted terry smart fabric under normal conditions is alternating current (AC). However, many electronic devices in daily life require direct current (DC) power. In order for the warp-knitted terry smart fabric to power these electronic devices, a rectifier is needed to convert the AC output of the warp-knitted terry smart fabric into DC power.

[0073] like Figure 9 As shown, the completed warp-knitted terry smart fabric (size 80×90mm) will be displayed. 2 The fabric is placed on the outer friction layer, with the napped side in contact with it. A manual hand-driven reciprocating horizontal sliding motion of the warp-knitted terry smart fabric powers a standard commercial calculator. In the experiment, powered by the warp-knitted terry smart fabric, the calculator was fully capable of performing various calculations, just as it would with batteries installed.

[0074] Example 5

[0075] In this embodiment, the fabric pile surface uses 160D non-conductive polyester yarn, while the fabric base uses 100D silver-plated nylon 66 conductive yarn. The outer friction layer is a polytetrafluoroethylene (PTFE) film. The completed warp-knitted terry smart fabric (approximately 50×50mm in size) is then... 2) is placed on the external rubbing layer, the fabric pile part is in contact with the external rubbing layer, and the fabric base cloth part is connected to the electrometer through the lead wire.

[0076] Effect test, the warp-knitted looped smart fabric of the embodiment is tested for triboelectric output, and a reciprocating vertical contact-separation motion is made on a polytetrafluoroethylene film at a speed of 40 mm / s, a load pressure of 1 kPa, and a separation distance of 50 mm. In detail, the test is shown in Figure 10 , the open-circuit voltage reaches about 27 V in a working cycle; please refer to Figure 11 , the short-circuit current reaches about 120 nA; please refer to Figure 12 , the short-circuit charge reaches about 9.3 nC. Please refer to Figure 13 , the warp-knitted looped smart fabric has a relatively sensitive corresponding characteristic to pressure, and the pressure sensitivity is about 1.71 V / kPa.

[0077] In addition, the warp-knitted looped smart fabric (about 50*50 mm 2 in size) is placed on the human foot bottom part to monitor the change of foot pressure when the person is moving. When the human body is moving, such as walking, running, jumping, etc., the foot bottom will have a contact-separation motion with the ground at different frequencies and pressures. Please refer to Figure 14 , the warp-knitted looped smart fabric attached to the foot bottom will generate corresponding electrical signals with the human movement, and transmit the electrical signals to the signal recognition device through the circuit. Under the processing of the signal recognition device, the electrical signals are converted into digital signals, and the digital signals are used to identify the movement state of the human body (for example Figure 14 , slow walking, fast running, jumping).

[0078] Example Six

[0079] In this embodiment, the fabric pile uses non-conductive yarn of 160D polyester yarn, and the fabric base cloth uses conductive yarn of 100D silver-plated nylon 66 yarn. The external rubbing layer is a polytetrafluoroethylene (PTFE) film. The warp-knitted looped smart fabric (about 50*50 mm 2 in size) is placed on the external rubbing layer, the fabric pile part is in contact with the external rubbing layer, and the fabric base cloth part is connected to the electrometer through the lead wire.

[0080] During the movement of the human body, the arms will unconsciously swing in order to maintain the body balance, and the amplitude and frequency of the arm swing will also change with the intensity of the movement. For example, when walking, the amplitude and frequency of the arm swing are small; when running, the amplitude and frequency of the arm swing are large; when high jumping and long jumping, the amplitude of the arm swing is large and the frequency is small.

[0081] In addition, the swing state of the left and right arms will also be different due to the change of the motion state of the human body. For example, when playing table tennis, the swing amplitude of the right arm of the human body will be larger; when skipping rope, the left and right arms will swing simultaneously; and when running, the left and right arms will swing alternately at the same frequency.

[0082] In this embodiment, the warp-knitted looped smart fabric is fixed at the armpit of the clothes by sewing to monitor the swing state of the human body when moving. The representation of the warp-knitted looped smart fabric to the swing state change mainly embodies the peak value and the peak distance of the triboelectric output waveform diagram.

[0083] Please refer to Figure 15 , which shows two different swing states of different amplitudes and frequencies, i.e., "slow" and "fast". When the swing state is "fast", the swing amplitude of the human body is large, the contact pressure of the warp-knitted looped smart fabric is large, the open circuit voltage is large, and the peak value of the output waveform is large. When the swing state is "slow", the swing frequency of the human body is small, and the peak distance of the output waveform is large.

[0084] In summary, the mature warp-knitting process is combined with the emerging triboelectric nanogenerator in the present application, and the advantages of both are fully utilized. Compared with the traditional wearable products, the warp-knitted looped smart fabric provided by the present application has better flexibility and air permeability while meeting the self-powered transmission and monitoring, has the body-fitting and comfortable-to-use properties of the textile itself, and avoids the problem of power safety of the traditional wearable products. In addition, compared with other fabrics such as weft-knitted fabrics, the warp-knitted looped fabric has good dimensional stability and excellent warmth retention, and can meet the requirements of normal repeated use and use in cold environments. The warp-knitted looped smart fabric provided by the present application retains the advantages of easy processing and high production efficiency of warp-knitted fabrics, and also has the characteristics of wide selection of raw materials and low cost of triboelectric nanogenerators, so it has the potential for large-scale manufacturing and is very suitable for commercial production. The surface of the looped fabric is relatively fluffy, and when in contact with the outside world, the pile on the surface of the looped fabric has a larger contact area than the flat and non-fuzzy fabric, and the friction electrification ability of the looped fabric with the outside world is stronger. Due to this feature, the warp-knitted looped smart fabric provided by the present application has a larger triboelectric output and a higher output power when powering itself or other electronic devices.

[0085] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A frictional nanogenerator based warp-knitted looped smart fabric, characterized in that, The fabric pile is in contact with external substances, and the fabric base cloth is not in contact with external substances; The fabric pile is a triboelectric layer of the warp-knitted terry intelligent fabric, and the fabric base cloth is a conductive layer and a supporting layer of the warp-knitted terry intelligent fabric; The fabric pile is a warp-knitted terry structure, the warp-knitted terry intelligent fabric is knitted by using a terry warp-knitting machine, the terry warp-knitting machine at least includes a guide bar GB1, the warp-knitted terry structure of the fabric pile is knitted by using the guide bar GB1 by using a loop-dropping method, in order to enable the yarn knitted to form the warp-knitted terry structure to drop from the guide bar GB1 and form a terry loop during knitting, the guide bar GB1 is used to thread the yarn by using a one-thread-one-empty method, and an auxiliary pulling mechanism is used in a post-finishing process to make the terry loop part fluffy and uniform, the fabric pile is knitted by using chemical fibers or natural fibers which are not conductive and have strong dielectric properties, and the fabric base cloth is knitted by using conductive yarns which can conduct electricity and have good tensile strength and flexibility.

2. The triboelectric nanogenerator-based warp-knitted looped smart fabric according to claim 1, wherein, The fabric pile is in contact with an external rubbing layer, and the fabric base cloth is connected to an external electronic device through a wire.

3. The warp-knitted looped smart fabric based on the tribo-nano generator according to any one of claims 1 to 2, characterized in that, The terry warp-knitting machine further includes a guide bar GB2 and a guide bar GB3.

4. The triboelectric nanogenerator-based warp-knitted looped pile smart fabric according to claim 3, characterized in that, The fabric base cloth is knitted by the guide bar GB2 and the guide bar GB3, and the guide bar GB2 and the guide bar GB3 are used to thread the yarn by using a one-empty-one-thread method.

5. The triboelectric nanogenerator-based warp-knitted looped smart fabric of claim 1, wherein, The raw yarn used for the fabric pile includes one of polyester, polyamide, polytetrafluoroethylene fiber, polypropylene, wool, and silk.

6. The triboelectric nanogenerator-based warp-knitted looped smart fabric of claim 1, wherein, The raw yarn used for the fabric base cloth includes one of silver-plated polyamide and silver-plated polyester.

7. Application of the warp-knitted terry intelligent fabric based on a triboelectric nanogenerator according to claim 1 in the field of clean energy collection, for supplying energy to electronic products.

8. Application of the warp-knitted terry intelligent fabric based on a triboelectric nanogenerator according to claim 1 in the field of flexible sensing, for human motion monitoring.

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