CN114665740A - Internal multi-degree-of-freedom flag type friction nano generator and self-powered sensor - Google Patents
Internal multi-degree-of-freedom flag type friction nano generator and self-powered sensor Download PDFInfo
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- CN114665740A CN114665740A CN202210226470.4A CN202210226470A CN114665740A CN 114665740 A CN114665740 A CN 114665740A CN 202210226470 A CN202210226470 A CN 202210226470A CN 114665740 A CN114665740 A CN 114665740A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
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Abstract
The invention provides an internal multi-degree-of-freedom flag type friction nano generator and a self-powered sensor. Wherein the interior multi freedom flag type friction nanometer generator includes: the two surfaces of the polytetrafluoroethylene film are polished; the surface of the polyethylene glycol terephthalate film, which faces to the polytetrafluoroethylene film, is uniformly coated with conductive ink; the polytetrafluoroethylene film is fixedly connected with the edges of the polyethylene glycol terephthalate films arranged at the upper part and the lower part; when external vibration is applied, the middle part of the polytetrafluoroethylene film is alternately contacted and separated with the polyethylene glycol terephthalate films arranged up and down respectively, so that different potential differences are generated between the films on two sides of the polyethylene glycol terephthalate at different moments, and current can be generated under the condition of stable air inlet after the polytetrafluoroethylene film is externally connected with an external circuit. The invention can improve the power generation energy density of the flag type friction nano generator, so that a single small-sized flag type friction nano generator can output larger energy efficiency.
Description
Technical Field
The invention relates to the technical field of self-energy supply, in particular to an internal multi-degree-of-freedom flag type friction nano generator and a self-energy supply sensor.
Background
With the rapid development of modern society and the arrival of the artificial intelligence era, people have increasingly kept away from various electronic devices in daily life. The continuous supply of electric energy cannot be kept regardless of personal miniaturized electronic equipment or industrial production equipment. The problem of energy shortage is becoming more serious, and the development of mechanical equipment capable of utilizing renewable energy sources is urgently needed to relieve the problem caused by the traditional energy shortage. The renewable energy sources such as wind energy, ocean energy and sound energy have the advantages of large storage capacity, wide distribution range, no pollution and good utilization value. However, the utilization rate of the development technology of renewable energy is low at present, so that the exploration of a new renewable energy utilization mode has a very important significance for promoting the healthy development of society and solving the energy shortage.
The existing novel energy technology mainly adopts solar power supply and fuel cell power supply, but the solar power supply is limited by various environmental factors such as temperature, humidity and altitude, and is difficult to lay in a large area; fuel cells are limited by fuel carrying and safety issues. Both can only solve the problem of energy shortage to a certain extent. Under the background, a novel self-powered technology is produced. The novel self-energy supply technology realizes self-energy supply to the sensor and the micro electronic device by collecting environmental wind energy, vibration energy, sound energy and the like, and provides possibility for solving the problem of energy shortage. The traditional self-powered technology mainly depends on photoelectric effect, piezoelectric effect and electromagnetic induction effect. Although the technology can realize self-energy supply to the equipment, the device structure is large, the cost is high, the structure is complex, and the self-energy supply technology is difficult to be further developed.
The friction nano generator technology based on the coupling of the friction electrification and the electrostatic induction is provided in recent years, has the characteristics of high output efficiency, simple preparation process, low preparation cost and clean and pollution-free energy conversion process, can be widely applied to the collection of various environmental energies through the design of different structures, and has great development prospects in the aspects of the collection of the future environmental energies and the utilization of new energy. At present, the friction nano generator is widely applied to environmental energy collection, and can convert collected environmental energy into electric energy to supply power for electronic equipment.
Wind energy is one of clean energy widely existing in nature, and the wind energy is converted into electric energy to be output by designing a proper friction nano generator structure, so that the problem of energy shortage in the current society can be effectively solved. The existing flag type friction nanometer generator for collecting wind energy is low in energy density and low in output energy efficiency of a small-area power generation flag, the overall output energy efficiency can be improved only through series-parallel connection processing of a plurality of flags to supply power for a sensor node and an electronic device, the processing mode increases the size of the overall power generation device, the problem of circuits is easily caused due to the fact that external circuits are too many, and the durability of the friction nanometer generator is reduced virtually.
Disclosure of Invention
According to the technical problems of low energy density and low output energy efficiency of the conventional flag type friction nano generator, the internal multi-freedom-degree flag type friction nano generator and the self-powered sensor are provided. The invention can improve the power generation energy density of the flag type friction nano generator, so that a single small-sized flag type friction nano generator can output larger energy efficiency.
The technical means adopted by the invention are as follows:
the utility model provides an inside multi freedom flag type friction nanometer generator which characterized in that includes:
the two surfaces of the polytetrafluoroethylene film are both polished by abrasive paper;
the printing ink comprises polyethylene terephthalate films, wherein the polyethylene terephthalate films are respectively laid on the upper surface and the lower surface of the polytetrafluoroethylene film, and conductive ink is uniformly brushed on the surface of any polyethylene terephthalate film facing the polytetrafluoroethylene film;
the polytetrafluoroethylene film is fixedly connected with the edges of the polyethylene glycol terephthalate films arranged up and down;
when external vibration is received, the middle part of the polytetrafluoroethylene film is alternately contacted and separated with the polyethylene glycol terephthalate films arranged at the upper part and the lower part respectively, so that frictional electrification is generated to enable the polytetrafluoroethylene film to be negatively electrified, the polyethylene glycol terephthalate films at two sides are respectively positively electrified, the polyethylene glycol terephthalate films at two sides have potential difference due to the difference between the distances between the polytetrafluoroethylene film and the polyethylene glycol terephthalate films at two sides in the movement process, and current can be generated under the condition of stable air inlet after the polytetrafluoroethylene film is externally connected with an external circuit.
Furthermore, a plurality of soft thin cushion strips are uniformly arranged on one side of the polyethylene terephthalate film, which is coated with the conductive ink, along the length direction and the vertical length edge.
Further, the polytetrafluoroethylene film is divided into a first part and a second part in the length direction, wherein the width of the second part is smaller than that of the first part.
Further, the second portion is cut into a plurality of belt-like structures uniformly in the width direction.
Further, the length of the first portion of the polytetrafluoroethylene film is 7/50-11/50 of the total length of the polyethylene terephthalate film.
Furthermore, a frame-shaped flexible insulating layer is adhered to the edge position of any one surface of the polytetrafluoroethylene film so as to prevent the conductive ink layers on the two sides of the polytetrafluoroethylene film from contacting with each other to cause short circuit.
Further, the width of the frame-shaped flexible insulating layer is 5 mm.
Further, the friction nano generator also comprises a lead for connecting the conductive ink layer on the polyethylene terephthalate film so as to realize electric energy output.
The invention also discloses a self-powered sensor which comprises a rectifying circuit, a sensing device and the internal multi-degree-of-freedom flag type friction nano generator;
the electric energy generated by the internal multi-degree-of-freedom flag type friction nano generator is transmitted to the rectifying circuit through the conducting wire and is rectified to supply power to the sensing device.
Compared with the prior art, the invention has the following advantages:
the invention optimizes the original flag type friction nano generator for three times, and the three times respectively comprise modification treatment of the wind-induced vibration film, treatment of adding a cushion layer on the conductive ink layer and treatment of increasing the degree of freedom in cutting the wind-induced vibration film. For example, under the condition of the flag size of 7cm x 14cm, the untreated original flag type friction nano-generator has the open-circuit voltage of 24V, the short-circuit current of 2 muA and the transferred charge amount of 14nC under the environment wind energy of 11.1 m/s. After the wind-induced vibration film is subjected to 1200-mesh sand paper modification treatment, under the same conditions, the open-circuit voltage is 35V, the short-circuit current is 2.82 muA, and the transfer charge amount is 31 nC. Further, after the conductive ink layer was subjected to the cushion treatment, the open-circuit voltage was 37.5V, the short-circuit current was 2.89 μ a, and the transferred charge amount was 34 nC. Further, after the process of increasing the degree of freedom in the cutting of the wind-induced vibration film, at the optimum degree of freedom, the open-circuit voltage was 78V, the short-circuit current was 7.0 μ a, and the amount of transferred electric charge was 72 nC. The output performance of the flag type friction nano generator is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an explosion diagram of an internal multi-degree-of-freedom flag type friction nano generator structure.
FIG. 2 is a schematic view of the shape of the polytetrafluoroethylene film of the invention in a flat state.
FIG. 3 is a schematic view of the shape of the PTFE film of the present invention in a vibrating state.
Fig. 4 is a schematic diagram of the self-powered sensor structure of the present invention.
In the figure: 1. the flexible printing ink comprises a polyethylene terephthalate film, 2 parts of a conductive ink layer, 3 parts of a soft fine backing strip, 4 parts of a polytetrafluoroethylene film, 401 parts of a first part, 402 parts of a second part, 5 parts of a flexible insulating layer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
The invention discloses an internal multi-degree-of-freedom flag type friction nano generator which comprises a polytetrafluoroethylene film 4 and a polyethylene glycol terephthalate film 1. Both surfaces of the polytetrafluoroethylene film 4 in the invention are polished by sand paper. Polyethylene terephthalate films 1 are respectively laid on the upper surface and the lower surface of the polytetrafluoroethylene film 4, and any surface of the polyethylene terephthalate film facing the polytetrafluoroethylene film is uniformly coated with conductive ink to form an ink layer 2. The polytetrafluoroethylene film 4 is fixedly connected with the edges of the polyethylene terephthalate films 1 arranged up and down; when external vibration is applied, the middle part of the polytetrafluoroethylene film 4 is alternately contacted and separated with the polyethylene terephthalate films 1 arranged up and down respectively, so that relative friction is generated to further cause electron movement to generate current. In a preferred embodiment of the present invention, the teflon film 4 is sanded with 1200 mesh sandpaper. Theoretically, the polished polytetrafluoroethylene film 4 can realize functions, but the larger the mesh number of the abrasive paper is, the better the modification treatment effect is. The 1200-mesh sand paper is selected after the cost and the treatment effect of the sand paper are integrated, and only the sand paper modification treatment is actually needed.
Furthermore, a plurality of soft thin filler strips are uniformly arranged on one side of the polyethylene terephthalate film 1 coated with the conductive ink along the length direction and the vertical length edge. Preferably, the soft and thin cushion strips are preferably two pairs, and too much soft and thin cushion layer makes it difficult to complete contact triboelectric charging of the PET film and the PTFE film on both sides.
Further, the teflon film 4 is divided into a first portion and a second portion in the length direction, wherein the second portion has a smaller width than the first portion, as shown in fig. 2. Further, the second portion is cut into a plurality of belt-like structures uniformly in the width direction, as shown in fig. 3.
In particular, the length of the first portion should be much smaller than the length of the second portion. According to experimental observation, the flag type friction nano generator is bent for the first time at a position 11/50 away from the root of the flag under the condition of air inlet, and the internal PTFE film can flap the PET film, so that the strip cutting process is effective and needs to be performed before the distance from the root 11/50. If the cutting strip is too long, the PTFE film inside the PET film is easy to curl, so that carbon layers on two sides of the PET film are conducted to form a short circuit, and the electricity generating capacity is lost. Thus, in the present application the length of the first portion of the polytetrafluoroethylene film is 7/50-11/50, preferably 1/5 in a preferred embodiment, based on the length of the polyethylene terephthalate film.
In the present application, the PTFE film is of a size comparable to that of the PET film, and the total length of the PTFE film inside is preferably slightly shorter than that of the PET film, and the shorter distance is preferably not more than 5 mm. This length should not exceed flexible insulating layer width, avoid both sides PET film contact short circuit and make the PTFE film not fixed one side can swing at will.
In the preferred embodiment as shown in fig. 3, the second portion is preferably cut evenly in the width direction into 5 strip-like structures. Actually, the number of the strip-shaped structures can be changed according to the actual situation, and according to experimental observation, the performance of the friction nano generator for generating electric energy is gradually improved when the number of the strip-shaped structures is gradually increased from 1 to 5, and the performance of the friction nano generator for generating electric energy is gradually reduced when the number of the strip-shaped structures is gradually reduced from 5 to 8, so that the 5 strip-shaped structures are preferred in the embodiment.
Furthermore, a frame-shaped flexible insulating layer is adhered to the edge of any one surface of the polytetrafluoroethylene film so as to prevent the conductive ink layers on the two sides of the polytetrafluoroethylene film from contacting with each other to cause short circuit.
Further, the width of the frame-shaped flexible insulating layer is 5 mm.
Further, the friction nano generator also comprises a lead for connecting the conductive ink layer on the polyethylene terephthalate film so as to realize electric energy output.
The structure of the friction nano-generator is further explained by the specific application example and the attached drawing.
As shown in figure 1, the invention provides an internal multi-degree-of-freedom flag type friction nano generator which mainly comprises five films, wherein the middle film is a Polytetrafluoroethylene (PTFE) film 4 subjected to surface treatment by 1200-mesh sand paper, and the preferred thickness is 0.08 mm. Two outside films of Polytetrafluoroethylene (PTFE) film 4 are polyethylene terephthalate (PET) film 1, and preferred thickness is 25 μm, brush electrically conductive printing ink 2 respectively in polyethylene terephthalate film one side, electrically conductive printing ink layer can completely cover polyethylene terephthalate film layer guarantee electrically conductive can, the theory electrically conductive printing ink layer on the thinner the better. One side of the polyethylene glycol terephthalate 1 brushed with the conductive ink 2 is respectively opposite to polytetrafluoroethylene 4 to form a PET-PTFE-PET double-electrode friction nano generator. The polytetrafluoroethylene film is used as a friction layer, and the polyethylene terephthalate film with conductive ink on two sides is used as a conductive layer and a friction layer.
Furthermore, two pairs of fine cushion layers 3 are adhered to one surface of the polyethylene terephthalate film 1, which is brushed with the conductive ink layer 2, and the material property of the fine cushion layers is required to be soft cushion layers.
Furthermore, in order to avoid the short circuit caused by the contact between the conductive ink layers 2 brushed on the polyethylene terephthalate films 1 at the two sides of the polytetrafluoroethylene film 4 due to the width reduction of the middle polytetrafluoroethylene film 4, a flexible insulating layer 5 should be adhered to one side of any one polyethylene terephthalate film 1 brushed with the conductive ink 2, and in this embodiment, preferably, a transparent adhesive tape is used as the insulating layer, and an annular insulating layer with the width of 5mm is adhered inwards along the periphery of the outer side 1 of the polyethylene terephthalate film.
Furthermore, in order to increase the contact and separation effect of the middle polytetrafluoroethylene layer 4 and the polyethylene terephthalate films 1 at the two sides, the middle polytetrafluoroethylene film 4 is subjected to equal cutting treatment to increase the degree of freedom, the cutting starts from the opposite side of the polytetrafluoroethylene film flagpole and cuts towards the flagpole side, the cutting length reaches 4/5 of the total length of the film, and a plurality of strip-shaped polytetrafluoroethylene films with the same length and width are formed.
And further, processing two conductive ink layers brushed on the polyethylene terephthalate film, leading out a lead at one end of the conductive layer close to the flagpole side, and leading out two leads from the two conductive layers together for outputting electric energy of the friction nano-generator. Wherein, the four sides of the whole flag type friction nano generator are connected together by an adhesive (the patent uses a common double-sided adhesive as the adhesive).
The invention also discloses a self-powered sensor, which comprises a rectifying circuit, a sensing device and the internal multi-freedom-degree flag type friction nano generator as shown in the figure 4; electric energy generated by the internal multi-degree-of-freedom flag type friction nano generator is transmitted to the rectifying circuit through the conducting wire and is rectified to supply power to the sensing device.
The flag type friction nano generator can supply power for the micro sensor node or the electronic device by collecting environmental wind energy, and the specific principle is as follows:
when wind blows from a certain direction, the whole flag generates wind-induced vibration, polytetrafluoroethylene film strips in the flag generate free vibration, polyethylene terephthalate films on two sides are staggered and flapped, so that a friction charging effect is generated to enable the polytetrafluoroethylene films to be negatively charged, the polyethylene terephthalate films on two sides are respectively positively charged, the polyethylene terephthalate films on two sides have potential difference due to the difference of relative distances between the polytetrafluoroethylene films and the polyethylene terephthalate films on two sides in the motion process, current can be generated under the condition of stable wind inlet after an external circuit is connected, and the external load circuit is connected to supply power to external microsensor nodes or electronic devices.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides an inside multi freedom flag type friction nanometer generator which characterized in that includes:
the two surfaces of the polytetrafluoroethylene film (4) are both polished by abrasive paper;
the printing ink comprises a polyethylene terephthalate film (1), wherein the polyethylene terephthalate film (1) is laid on the upper surface and the lower surface of a polytetrafluoroethylene film (4) respectively, and any surface, facing the polytetrafluoroethylene film (4), of the polyethylene terephthalate film (1) is uniformly coated with conductive ink;
the polytetrafluoroethylene film (4) is fixedly connected with the edges of the polyethylene terephthalate films (1) which are arranged up and down;
when external vibration is received, the middle part of the polytetrafluoroethylene film (4) is alternately contacted and separated with the polyethylene glycol terephthalate films (1) arranged up and down respectively, so that frictional electrification is generated to enable the polytetrafluoroethylene film (4) to be negatively electrified, the polyethylene glycol terephthalate films (1) on two sides are respectively positively electrified, the polyethylene glycol terephthalate films (1) on two sides have potential difference due to the difference of the distance between the polytetrafluoroethylene film (4) and the polyethylene glycol terephthalate films (1) on two sides in the movement process, and current can be generated under the condition of stable air inlet after an external circuit is connected.
2. The internal multi-degree-of-freedom flag-type friction nanogenerator according to claim 1, wherein a plurality of soft thin filler strips (3) are uniformly arranged on one side of the polyethylene terephthalate film (1) coated with the conductive ink along the length direction and the vertical length edge.
3. An internal multiple degree of freedom flag-type triboelectric nanogenerator according to claim 1 or 2, characterized in that the polytetrafluoroethylene film (4) is divided in length into a first part (401) and a second part (402), wherein the second part (402) has a smaller width than the first part (401).
4. An internal multiple degree of freedom flag-type friction nanogenerator according to claim 3, characterized in that the second part (402) is cut into several band-like structures uniformly in width direction.
5. An internal multiple degree of freedom flag type friction nanogenerator according to claim 3, characterized in that the length of the first part (401) of the polytetrafluoroethylene film (4) accounts for 7/50-11/50 of the total length of the polyethylene terephthalate film (1).
6. The internal multi-degree-of-freedom flag-type friction nanogenerator according to claim 1 is characterized in that a frame-shaped flexible insulating layer (5) is adhered to the edge position of any one surface of the polytetrafluoroethylene film (4) so as to prevent the conductive ink layers (2) on the two sides of the polytetrafluoroethylene film (4) from contacting with each other to cause short circuit.
7. An internal multiple degree of freedom flag type friction nanogenerator according to claim 6, characterized in that the width of the frame-like flexible insulating layer (5) is 5 mm.
8. The internal multi-degree-of-freedom flag-type friction nanogenerator according to claim 1, wherein the friction nanogenerator further comprises a lead for connecting the conductive ink layer (2) on the polyethylene terephthalate film (1) so as to realize electric energy output.
9. A self-powered sensor, characterized by comprising a rectifying circuit, a sensing device and an internal multiple-degree-of-freedom flag-type friction nanogenerator according to any one of claims 1 to 8;
and electric energy generated by the internal multi-degree-of-freedom flag type friction nano generator is transmitted to the rectifying circuit through the conducting wire and is rectified to supply energy to the sensing device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210226470.4A CN114665740A (en) | 2022-03-09 | 2022-03-09 | Internal multi-degree-of-freedom flag type friction nano generator and self-powered sensor |
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| CN202210226470.4A CN114665740A (en) | 2022-03-09 | 2022-03-09 | Internal multi-degree-of-freedom flag type friction nano generator and self-powered sensor |
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