CN109974907B - Integrated active power supply flexible pressure sensor - Google Patents
Integrated active power supply flexible pressure sensor Download PDFInfo
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- CN109974907B CN109974907B CN201910197796.7A CN201910197796A CN109974907B CN 109974907 B CN109974907 B CN 109974907B CN 201910197796 A CN201910197796 A CN 201910197796A CN 109974907 B CN109974907 B CN 109974907B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M12/00—Hybrid cells; Manufacture thereof
- H01M12/04—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type
- H01M12/06—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type with one metallic and one gaseous electrode
- H01M12/065—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type with one metallic and one gaseous electrode with plate-like electrodes or stacks of plate-like electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0085—Immobilising or gelification of electrolyte
Abstract
The invention provides an integrated active power supply flexible pressure sensor which comprises a sensing unit with a sandwich structure and a power unit which is arranged in a stacking mode with the sensing unit and used for supplying power to the sensing unit, wherein the power unit is a zinc-air battery with the sandwich structure and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, the anode is a flexible zinc-containing electrode, and the cathode is a flexible air electrode; the sensing unit comprises a negative electrode, a positive electrode and conductive fiber paper or conductive woven cloth, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive fiber paper or the conductive woven cloth is clamped between the positive electrode and the negative electrode, and the sensing unit takes the flexible zinc-containing electrode of the power unit as the negative electrode. The integrated active power supply flexible pressure sensor realizes the integrated design of the power unit and the sensing unit, and can be applied to practical applications such as human physiological health monitoring.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to an integrated active power supply flexible pressure sensor.
Background
With the rapid popularization of intelligent terminals, research and application of flexible wearable electronics are embodied in many aspects of human life, such as electronic skins, wearable physiological monitoring devices, human-computer interaction and the like. The sensor is one of the core components, plays a vital role in aspects such as human health monitoring and artificial intelligence, and influences the functional design and future development of the wearable device. As an emerging electronic product with good deformability and stability, various flexible and wearable sensors are rapidly developing in global medical monitoring systems, including implantable biomedical sensors, chemical sensors, pressure sensors, etc. In these research results, the pressure sensor, as an important functional component, effectively converts external stimuli into electrical signals or other recognizable signal outputs, and is a key technology for the flexible wearable electronic sensor to monitor the health condition of the body. The flexible sensing unit, the transmission module and the self-sustaining power supply form a flexible sensor system. However, it is worth noting that the current power unit is one of the biggest limitations of flexible sensors to achieve the above characteristics, because in the current technical background, most sensors need an external power supply to drive the sensors to operate, and the used power supply system is mostly a rigid battery, which results in a large volume of the whole system and greatly hinders the further application of the system in the development of wearable devices.
Based on the problem that most sensors need an external power supply (rigid battery) to drive the sensors to operate, the whole system is large, and the light, thin and convenient effects of the sensors in wearable application are prevented, and the self-powered functional sensors attract the attention of scientific research workers. Many types of self-powered functional sensors for health monitoring and motion tracking have been developed gradually, providing an exciting opportunity for real-time, non-invasive measurement of human physiological and motion signals. In recent years, triboelectric and electrostatic induction based tribonano-generators have proven to be an emerging renewable energy technology. The device can obtain electric energy from external mechanical stimulation, and simultaneously, the generated electric signal is used as a sensing signal. However, it is worth noting that the output voltage of the triboelectric nano-generator sensor is high, the current is low, the output impedance is large, the actual output power is only in the level of microwatt-milliwatt, and the applicability of the triboelectric nano-generator as a power supply is influenced; in addition, the alternating current output by the friction motor is also an important problem which hinders the practical application of the friction motor.
In summary, it is known that static pressure monitoring using flexible sensing technology is still a challenge without an external power source.
Disclosure of Invention
The embodiment of the invention provides an integrated active power supply flexible pressure sensor, and aims to solve the problems that most of existing sensors need an external power supply to drive the sensors to operate, and the existing power supply is mostly a rigid battery, so that the size of the whole system is large, and the light weight, the thinness and the convenience of the sensors in wearable application are greatly hindered.
In order to achieve the purpose, the invention adopts the following technical scheme:
an integrated active power supply flexible pressure sensor comprises a sensing unit with a sandwich structure and a power unit which is arranged in a stacking manner with the sensing unit and is used for supplying power to the sensing unit,
the power unit is a zinc-air battery with a sandwich structure and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, wherein the anode is a flexible zinc-containing electrode, the gel electrolyte is selected from one of ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel coated by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel coated by fiber paper or woven cloth, and the cathode is a flexible air electrode;
the sensing unit comprises a negative electrode, a positive electrode and conductive fiber paper or conductive woven cloth, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive fiber paper or the conductive woven cloth is clamped between the positive electrode and the negative electrode, and the sensing unit takes the flexible zinc-containing electrode of the power unit as the negative electrode.
The integrated active power supply flexible pressure sensor provided by the invention has the following advantages:
firstly, a zinc-air battery is adopted as a power unit, a flexible zinc-containing electrode of the power supply is simultaneously used as a negative electrode of a sensing unit, and the power unit can supply power to the sensing unit. Compared with the prior art that the sensors are in the state that the power unit and the sensing unit are separated and combined, the flexible pressure sensor integrates the power battery unit and the sensing unit, realizes the integrated design of the power unit and the sensing unit, and solves the problems that the volume of the whole system is large and the lightening and the convenience of the whole system in wearable application are hindered when an external power supply drives the sensing unit to operate, so that the flexible pressure sensor can be applied to the practical application of human physiological health monitoring and the like.
Secondly, the power unit of the integrated active power supply flexible pressure sensor provided by the invention takes a flexible zinc-containing electrode as an anode, and takes ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel loaded on fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel loaded on the fiber paper or woven clothOne of the polyvinyl alcohol/ionic liquid gel is used as an electrolyte, so that the power unit is endowed with good flexibility and stability; and has no corrosiveness and better biocompatibility. More importantly, the integrated active power supply flexible pressure sensor obtained by the method has better power, and the electric energy generated by the sensor can supply power for the whole circuit of the sensing unit and the wireless signal transmission under the condition of not needing an external power supply, namely, the self-sufficiency of energy is realized. Taking a power unit with the thickness of 0.5mm in the power unit of the integrated active power supply flexible pressure sensor (a zinc-air battery, the gel electrolyte is ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel) as an example, the maximum power of the power unit area is about 40mW/cm2And bending of +/-180 degrees can be realized.
In addition, the integrated active power supply flexible pressure sensor provided by the invention is small in size, independent and portable, and high in sensitivity, and all components of the whole integrated active power supply flexible pressure sensor have better flexibility, so that the popularization and application of the small-size human body detection sensor without an external power supply can be realized. Particularly, a series of static pressure detection applications such as human physiological health monitoring can be realized without an external power supply, such as human pulse detection.
Drawings
FIG. 1 is a schematic diagram of a pressure sensing portion according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an integrated actively powered flexible pressure sensor provided by an embodiment of the present invention;
FIG. 3 is a graph of open circuit voltage and short circuit current for an integrated actively powered flexible pressure sensor power unit provided in accordance with example 1 of the present invention;
FIG. 4 is a graph of a bending test result of a power unit of the integrated active power supply flexible pressure sensor provided in embodiment 1 of the present invention;
FIG. 5 is an effect diagram of the driving electronic watch of the power unit of the integrated active power supply flexible pressure sensor provided by the embodiment 1 of the invention;
FIG. 6 is an effect diagram of the driving LED of the power unit of the integrated active power supply flexible pressure sensor provided in embodiment 1 of the present invention;
fig. 7 is a stability display diagram of a single battery of the power unit of the integrated active power supply flexible pressure sensor provided in embodiment 1 of the present invention, which drives an LED lamp through a boost module and bends at will;
fig. 8 is a pulse beat test result chart of the integrated active power supply flexible pressure sensor provided in embodiment 2 of the present invention, which is respectively used for the wrist, the neck and the instep of a human body.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The embodiment of the invention provides an integrated active power supply flexible pressure sensor which comprises a sensing unit with a sandwich structure and a power unit which is stacked with the sensing unit and used for supplying power to the sensing unit,
the power unit is a zinc-air battery with a sandwich structure and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, wherein the anode is a flexible zinc-containing electrode, the gel electrolyte is selected from one of ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel coated by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel coated by fiber paper or woven cloth, and the cathode is a flexible air electrode;
the sensing unit comprises a negative electrode, a positive electrode and conductive fiber paper or conductive woven cloth, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive fiber paper or the conductive woven cloth is clamped between the positive electrode and the negative electrode, and the sensing unit takes the flexible zinc-containing electrode of the power unit as the negative electrode.
The integrated active power supply flexible pressure sensor provided by the embodiment of the invention has the following advantages:
firstly, a zinc-air battery is adopted as a power unit, a flexible zinc-containing electrode of the power supply is simultaneously used as a negative electrode of a sensing unit, and the power unit can supply power to the sensing unit. Compared with the prior art that the sensors are in the state that the power unit and the sensing unit are separated and combined, the power battery unit and the sensing unit are combined into a whole, the integrated design of the power unit and the sensing unit is realized, and the problems that the whole system is large in size and light, thin and convenient in wearable application are hindered when an external power supply drives the sensing unit to operate are solved, so that the flexible pressure sensor can be applied to practical application such as human physiological health monitoring.
Secondly, in the power unit of the integrated active power supply flexible pressure sensor provided by the embodiment of the invention, the flexible zinc-containing electrode is used as an anode, and one of ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth is used as an electrolyte, so that the power unit is endowed with good flexibility and stability; and has no corrosiveness and better biocompatibility. More importantly, the integrated active power supply flexible pressure sensor obtained by the method has better power, and the electric energy generated by the sensor can supply power for the whole circuit of the sensing unit and the wireless signal transmission under the condition of not needing an external power supply, namely, the self-sufficiency of energy is realized. Taking a power unit (a zinc-air battery, and the gel electrolyte is ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel) with the thickness of 0.5mm in the power unit of the integrated active power supply flexible pressure sensor as an example, the maximum power of the power unit area is about 40mW/cm2, and bending of +/-180 degrees can be realized.
In addition, the integrated active power supply flexible pressure sensor provided by the embodiment of the invention has the advantages of small volume, independence, portability and high sensitivity, and all the components of the whole integrated active power supply flexible pressure sensor have better flexibility, so that the popularization and the application of the small-volume human body detection sensor without an external power supply can be realized. Particularly, a series of static pressure detection applications such as human physiological health monitoring can be realized without an external power supply, such as human pulse detection.
In the embodiment of the invention, the integrated active power supply flexible pressure sensor comprises an integrated power unit and a sensing unit, wherein the power unit is in a sandwich structure, one of neutral ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth is taken as an electrolyte, so that the electrolyte has excellent flexibility, can meet the use requirements of flexible wearing equipment or sensors of human bodies, and has better battery power, therefore, the biocompatibility and flexibility are ensured, and meanwhile, the power supply for the sensing unit and the whole circuit can be considered.
Specifically, the power unit is a zinc-air battery, and the anode is a flexible zinc-containing electrode. Specifically, the flexible zinc-containing electrode is selected from one of zinc foil, zinc powder/conductive carbon paper and zinc powder/conductive cloth. The zinc powder/conductive carbon paper represents a flexible zinc-containing electrode formed by coating zinc powder slurry on the surface of conductive carbon paper in a scraping manner; the zinc powder/conductive cloth represents a flexible zinc-containing electrode formed by coating zinc powder slurry on the conductive cloth in a scraping mode. In some embodiments, the anode can be made of zinc foil with a thickness of 0.03-0.08 mm, especially 0.05mm, so as to endow the power unit with better flexibility, and meanwhile, the zinc foil can be used as a negative electrode of a sensing unit. In some embodiments, the anode can be made of zinc powder/conductive carbon paper or zinc powder/conductive cloth with a thickness of 0.1-0.2 mm, particularly 0.2mm, and at this time, the obtained power unit has better power, so that the power supply requirement for the sensing unit and the wireless signal transmission circuit can be met; more importantly, the power unit can be endowed with more excellent flexibility.
In the embodiment of the invention, the gel electrolyte is one of ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth, and the hydrogel is a neutral electrolyte, has high flexibility and water locking property, is environment-friendly and has better biocompatibility. In particular, the zinc-air battery configured by using one of ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel carried by fiber paper or woven cloth together with the flexible zinc-containing electrode and the air electrode has good flexibility, biocompatibility and power.
In one embodiment, the gel electrolyte is an ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel. The ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel comprises ammonium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water. Wherein, the ammonium chloride is used as an active material and can dissolve metal zinc, so that active reaction is carried out. The polyvinyl alcohol and the polyethylene glycol diacrylate are jointly used as matrix materials of the hydrogel, so that the hydrogel has excellent water locking performance, and the power unit is endowed with excellent flexibility and better strength. Particularly, the strength of the polyvinyl alcohol is weak, and the polyvinyl alcohol is usually prepared by a freezing technology, so that moisture in the polyvinyl alcohol can be evaporated in the freezing process, the obtained hydrogel is viscous and not easy to form, the hardness is poor, and the freezing technology method needs large-scale instruments and is complex and tedious to operate. In view of this, the polyethylene glycol diacrylate and the polyvinyl alcohol are added in the embodiment of the invention and can be prepared and obtained through photocuring, so that the preparation method is simple in process, time-saving and convenient, and the strength of the polyvinyl alcohol can be remarkably improved while the flexibility is ensured.
In a preferred embodiment, in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 10-25: 5-10: 15-25: 100. If the content of the ammonium chloride is too high, excessive ammonium chloride can be separated out in a solid state, so that zinc ions are inconvenient to move in the hydrogel, and the active reaction is hindered; in severe cases, the air electrode is blocked by solid ammonium chloride, which deactivates the air electrode. If the content of ammonium chloride is too small, the activity of the power unit is reduced. If the content of the polyvinyl alcohol is too high, the obtained hydrogel is too viscous and is not easy to form; on the contrary, if the content of the polyvinyl alcohol is too small, water cannot be effectively locked, thereby preventing the occurrence of the active reaction. If the content of the polyethylene glycol diacrylate is too much, the obtained hydrogel has too high strength, strong brittleness and poor corresponding flexibility; when the content of the polyethylene glycol diacrylate is too small, the hydrogel is too viscoelastic to be formed.
On the basis, in the most preferred embodiment, in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 20:10:20: 100. At the moment, the obtained power unit not only has excellent flexibility and biocompatibility, but also has better power, and realizes the wireless data transmission power supply of the sensing unit and the Bluetooth circuit on the premise of not externally supplying power.
In some embodiments, the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer is prepared by: dissolving ammonium chloride, polyvinyl alcohol and polyethylene glycol diacrylate in water according to the weight ratio of the substances to obtain a viscous mixture; and adding 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide serving as a photoinitiator into the viscous mixture, and reacting under the ultraviolet irradiation condition to prepare the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel.
Under the condition of ultraviolet irradiation, the polyethylene glycol diacrylate and the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide are subjected to crosslinking curing to form a polymer with better strength. Wherein the addition amount of the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide is 1-2% of the weight of the polyethylene glycol diacrylate, so that the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide residue is prevented from bringing side effects to the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel.
In one embodiment, the gel electrolyte is a potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel. The potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel comprises potassium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water. Wherein, the potassium chloride is used as an active material and can dissolve metal zinc, so that active reaction is carried out. The polyvinyl alcohol and the polyethylene glycol diacrylate are jointly used as matrix materials of the hydrogel, so that the hydrogel has excellent water locking performance, and the power unit is endowed with excellent flexibility and better strength. Particularly, the strength of the polyvinyl alcohol is weak, and the polyvinyl alcohol is usually prepared by a freezing technology, so that moisture in the polyvinyl alcohol can be evaporated in the freezing process, the obtained hydrogel is viscous and not easy to form, the hardness is poor, and the freezing technology method needs large-scale instruments and is complex and tedious to operate. In view of this, the polyethylene glycol diacrylate and the polyvinyl alcohol are added in the embodiment of the invention and can be prepared and obtained through photocuring, so that the preparation method is simple in process, time-saving and convenient, and the strength of the polyvinyl alcohol can be remarkably improved while the flexibility is ensured.
In a preferred embodiment, in the potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of potassium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 10-25: 5-10: 15-25: 100. If the content of the potassium chloride is too high, excessive potassium chloride can be separated out in a solid state, so that zinc ions are inconvenient to move in the hydrogel, and the active reaction is hindered; in severe cases, the air electrode is blocked by solid ammonium chloride, which deactivates the air electrode. If the content of potassium chloride is too small, the activity of the power unit is reduced. If the content of the polyvinyl alcohol is too high, the obtained hydrogel is too viscous and is not easy to form; on the contrary, if the content of the polyvinyl alcohol is too small, water cannot be effectively locked, thereby preventing the occurrence of the active reaction. If the content of the polyethylene glycol diacrylate is too much, the obtained hydrogel has too high strength, strong brittleness and poor corresponding flexibility; when the content of the polyethylene glycol diacrylate is too small, the hydrogel is too viscoelastic to be formed.
On the basis, in the most preferred embodiment, in the potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of potassium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 20:10:20: 100. At the moment, the obtained power unit not only has excellent flexibility and biocompatibility, but also has better power, and realizes the wireless data transmission power supply of the sensing unit and the Bluetooth circuit on the premise of not externally supplying power.
In some embodiments, the potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer is prepared by the following method: dissolving potassium chloride, polyvinyl alcohol and polyethylene glycol diacrylate in water to obtain a viscous mixture; and adding 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide serving as a photoinitiator into the viscous mixture, and reacting under the ultraviolet irradiation condition to prepare the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel.
Under the condition of ultraviolet irradiation, the polyethylene glycol diacrylate and the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide are subjected to crosslinking curing to form a polymer with better strength. Wherein the addition amount of the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide is 1-2% of the weight of the polyethylene glycol diacrylate, so that the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide residue is prevented from bringing side effects to the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel.
In one embodiment, the gel electrolyte is an ammonium chloride/polyvinyl alcohol/ionic liquid gel coated on a fiber paper or woven cloth. The ammonium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or the woven cloth comprises ammonium chloride, polyvinyl alcohol, ionic liquid and water. Wherein, the ammonium chloride is used as an active material and can dissolve metal zinc, so that active reaction is carried out. The polyvinyl alcohol is jointly used as a matrix material of the hydrogel, has excellent water locking performance, and endows the power unit with excellent flexibility and better strength. The ionic liquid is used as the gel electrolyte component, so that the evaporation of electrolyte liquid can be effectively reduced, the electrolyte conductivity is improved, and the service life of the battery is prolonged. Because the gel layer cannot be formed by using the materials taking ammonium chloride, polyvinyl alcohol, ionic liquid and water as active main bodies, the embodiment of the invention adopts flexible fiber paper or woven cloth as a carrier, and the surface of the carrier is coated with the ammonium chloride/polyvinyl alcohol/ionic liquid gel by dipping or coating to form the gel electrolyte layer.
In a preferred embodiment, in the ammonium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or woven cloth, the weight ratio of the ammonium chloride to the polyvinyl alcohol to the ionic liquid to the water is 1-3: 1-2: 1-3: 10. If the content of the ammonium chloride is too high, excessive ammonium chloride can be separated out in a solid state, so that zinc ions are inconvenient to move in the hydrogel, and the active reaction is hindered; in severe cases, the air electrode is blocked by solid ammonium chloride, which deactivates the air electrode. If the content of ammonium chloride is too small, the activity of the power unit is reduced. If the content of the polyvinyl alcohol is too much, the conductivity of the obtained gel electrolyte is reduced, the internal resistance of the battery is increased, and the electrical property is reduced; on the contrary, if the content of the polyvinyl alcohol is too small, the content of the electrolyte attached to the surface of the support becomes small, thereby reducing the occurrence of the active reaction. If the content of the ionic liquid is too much, the viscosity of the obtained gel electrolyte is reduced, and liquid leakage is easy to occur; when the content of the ionic liquid is too small, the fluidity of the ions in the gel electrolyte is deteriorated, and the occurrence of the active reaction is inhibited.
In some embodiments, the ammonium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or woven cloth is prepared by the following method: and (3) dissolving ammonium chloride, polyvinyl alcohol and ionic liquid in water to form gel, and dip-coating the fiber paper or the woven cloth in the ionic gel to prepare the ionic gel electrolyte layer.
In one embodiment, the gel electrolyte is a potassium chloride/polyvinyl alcohol/ionic liquid gel coated on a fiber paper or woven cloth. The potassium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or the woven cloth comprises potassium chloride, polyvinyl alcohol, ionic liquid and water. Wherein, the potassium chloride is used as an active material and can dissolve metal zinc, so that active reaction is carried out. The polyvinyl alcohol is jointly used as a matrix material of the hydrogel, has excellent water locking performance, and endows the power unit with excellent flexibility and better strength. The ionic liquid is used as the gel electrolyte component, so that the evaporation of electrolyte liquid can be effectively reduced, the electrolyte conductivity is improved, and the service life of the battery is prolonged. Since the gel layer cannot be formed by using potassium chloride, polyvinyl alcohol, ionic liquid and water as the active main materials, in the embodiment of the invention, flexible fiber paper or woven cloth is used as a carrier, and the surface of the carrier is coated with ammonium chloride/polyvinyl alcohol/ionic liquid gel by dipping or coating to form the gel electrolyte layer.
In a preferred embodiment, in the potassium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or woven cloth, the weight ratio of the potassium chloride to the polyvinyl alcohol to the ionic liquid to the water is 1-3: 1-2: 1-3: 10. If the content of the potassium chloride is too high, excessive potassium chloride can be separated out in a solid state, so that zinc ions are inconvenient to move in the hydrogel, and the active reaction is hindered; in severe cases, the air electrode is blocked by solid ammonium chloride, which deactivates the air electrode. If the content of potassium chloride is too small, the activity of the power unit is reduced. If the content of the polyvinyl alcohol is too much, the conductivity of the obtained gel electrolyte is reduced, the internal resistance of the battery is increased, and the electrical property is reduced; on the contrary, if the content of the polyvinyl alcohol is too small, the content of the electrolyte attached to the surface of the support becomes small, thereby reducing the occurrence of the active reaction. If the content of the ionic liquid is too much, the viscosity of the obtained gel electrolyte is reduced, and liquid leakage is easy to occur; when the content of the ionic liquid is too small, the fluidity of the ions in the gel electrolyte is deteriorated, and the occurrence of the active reaction is inhibited.
In some embodiments, the potassium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or woven cloth is prepared by the following method: providing potassium chloride, polyvinyl alcohol and ionic liquid, dissolving the potassium chloride, the polyvinyl alcohol and the ionic liquid in water to form gel, and dipping the fiber paper or the woven cloth in the ionic gel to prepare the ionic gel electrolyte layer. In addition to the above embodiments, the thickness of the gel electrolyte is 0.2mm to 0.4 mm. If the thickness of the gel electrolyte is too thick, the internal resistance of the battery is larger, the provided electric quantity can be reduced, but the flexibility can also be reduced, the flexible pressure sensor with flexible integrated active power supply is not beneficial to obtaining, and the gel electrolyte is not convenient to be applied to the technologies such as human physiological health monitoring and the like which need to be set into a small volume. As a preferred embodiment, the thickness of the gel electrolyte is 0.3 mm.
In the embodiment of the invention, in the power unit, the flexible air electrode is selected from a silver/conductive carbon paper electrode, a silver/conductive cloth electrode and MnO2Conductive carbon paper electrode, MnO2In the air electrode, a metal or a metal oxide is coated on a conductive carbon paper or a conductive cloth, and the metal or the metal oxide is disposed adjacent to the gel electrolyte. Specifically, the silver/conductive carbon paper electrode includes conductive carbon paper, and a silver layer formed on the conductive carbon paper, and the silver layer is disposed adjacent to the gel electrolyte. The silver/conductive carbon paper electrode can be prepared by the following method: and providing the breathable conductive carbon paper, coating silver paste on the surface of the breathable conductive carbon paper in a scraping manner, and drying to obtain the breathable conductive carbon paper. Other flexible air electrodes can refer to silver/conductive carbon paper electrodesThe method of (1). The flexible zinc-containing electrode is selected from one of zinc foil, zinc powder/conductive carbon paper and zinc powder/conductive cloth. In the zinc powder/conductive carbon paper and the zinc powder/conductive cloth, the zinc powder is formed on the conductive carbon paper or the conductive cloth, and the zinc powder is arranged adjacent to the gel electrolyte.
The flexible zinc-containing electrode, the gel electrolyte and the flexible air electrode are assembled into a sandwich structure, and the flexible zinc-air battery, namely the power unit of the integrated active power supply flexible pressure sensor, can be obtained.
In order to form a power unit with flexibility, so that an integrated active power supply flexible pressure sensor can be realized, and the power unit can be used in small-size human physiological health monitoring technology such as human pulse detection equipment, the thickness of the power unit is less than or equal to 1 mm. In a specific embodiment, the thickness of the power unit can be 0.5mm, and at the moment, the obtained integrated active power supply flexible pressure sensor has good flexibility and electrochemical performance and can supply power for wireless data transmission of the sensing unit and the Bluetooth circuit.
In the embodiment of the invention, on the basis of the power unit, the integrated active power supply flexible pressure sensor shares a flexible zinc-containing electrode of a zinc-air battery as a negative electrode of the sensing unit, and the pressure sensing unit with a conductive fiber paper-based sandwich structure is designed to form the integrated active power supply flexible pressure sensor with a five-layer structure.
Specifically, in the sensing unit, the conductive fiber paper is fiber paper coated with a conductive material, the conductive woven fabric is woven fabric coated with a conductive material, and the conductive material is selected from PEDOT: PSS, graphene, conductive carbon. Wherein the PEDOT: the PSS has good water solubility, is easy to adsorb on the surface of fiber paper or woven cloth, and obtains the sensing unit with good and stable conductivity. The material is used as a sensing material, has good sensitivity, and can realize human physiological health monitoring technology such as human pulse detection.
As an embodiment, the preparation method of the conductive fiber paper comprises the following steps: providing a conductive material solution and fiber paper, and soaking the fiber paper in the conductive material solution to obtain the conductive fiber paper. As an embodiment, the preparation method of the conductive woven cloth comprises the following steps: providing a conductive material solution and woven cloth, and soaking the woven cloth in the conductive material solution to obtain the conductive woven cloth.
In a particular embodiment, the PEDOT: the preparation method of the PSS conductive fiber paper comprises the following steps: providing a fiber paper and PEDOT: PSS, placing said fibrous paper on said PEDOT: and (4) soaking the PSS to obtain the conductive fiber paper. The flexible pressure sensing material is prepared by a method of dip-coating fiber paper with conductive polymer (PEDOT: PSS) by virtue of a porous structure of the fiber paper, so that a sensing unit with excellent conductivity and sensing sensitivity is obtained.
In an embodiment of the present invention, in the sensing unit, the positive electrode is a silver-containing electrode. The silver-containing electrode comprises one of silver/PET, silver/conductive cloth and silver/woven cloth. In the silver/PET, silver/conductive cloth, and silver/woven cloth, silver is formed on the PET or conductive cloth, and the silver is disposed adjacent to the conductive fiber paper or conductive woven cloth. The silver electrode can be prepared by screen printing silver paste on a PET plastic film as a substrate.
Finally, the conductive fiber paper and the silver electrode are sequentially assembled on the flexible zinc-containing electrode of the power unit, so that the integrated active power supply flexible pressure sensor with a five-layer structure is obtained.
In one embodiment, a zinc-air battery is used as a power unit to supply power to the sensor, when the sensor is pressed, the microstructure inside the fiber paper is changed, so that the electrical signal output by the device is changed, and the change relation between the pressure and the electrical signal is used as a sensing signal. Specifically, a schematic diagram of the structure of the pressure sensing part is shown in fig. 1.
Furthermore, the integrated active power supply flexible pressure sensor further comprises a wireless signal output unit connected with the sensor, and the power unit supplies power to the sensing unit and the wireless signal output unit. The wireless signal transmission system and the integrated active power supply flexible pressure sensor are integrated into a woundplast form, so that a real self-sufficient independent flexible sensing device is realized, and the woundplast can be directly attached to the surface of the skin of a human body to detect when in use and carry out wireless signal transmission. Specifically, can be integrated with flexible integration initiative power supply pressure sensor and bluetooth wireless signal transmission system, the electric energy of sensor self can compromise the wireless data transmission power supply for sensing unit and bluetooth circuit, can directly attach when using and detect the pulse in human pulse department and beat to wireless signal transmission.
As a specific preferred embodiment, as shown in fig. 2, the integrated active power supply flexible pressure sensor includes a power unit and a sensing unit, which are stacked and arranged in a sandwich structure, and further includes a wireless signal output unit connected to the sensor, and the power unit supplies power to the sensing unit and the wireless signal output unit, wherein,
in the power unit, the power unit is a zinc-air battery and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, wherein the anode is a flexible zinc foil electrode, the gel electrolyte is ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the cathode is a flexible air electrode, and the air electrode is a silver/conductive carbon paper electrode; in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride to polyvinyl alcohol to polyethylene glycol diacrylate to water is 10-25: 5-10: 15-25: 100; the thickness of the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel is 0.25 mm-0.35 mm; and the thickness of the power unit is 0.5 mm;
the sensing unit comprises a negative electrode, a positive electrode and a conductive fiber paper layer, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive fiber paper layer is clamped between the positive electrode and the negative electrode, the sensing unit takes a flexible zinc-containing electrode of the power unit as the negative electrode, and the conductive fiber paper contains PEDOT: PSS fiber paper; the positive electrode is a silver electrode.
The embodiment provided by the invention is established in the working principle of a zinc-air battery, the power unit of a sensing device is designed and manufactured, the environment-friendly zinc-air battery with a sandwich structure based on the photo-curing polymer hydrogel neutral electrolyte is prepared, and the power unit with flexibility, biocompatibility and high power is provided. Meanwhile, conductive fiber paper with a porous structure is used as a sensing material and is established on the basis of a power unit, a flexible zinc-containing electrode of a zinc-air battery is shared, a sensing part with a sandwich structure is designed, an integrated active power supply flexible pressure sensor with a five-layer structure is formed, and power is supplied to work through a power part of the device. The wireless signal transmission circuit and the integrated active power supply flexible pressure sensor are integrated to form a portable wireless signal transmission integrated active power supply flexible pressure sensor detection system, the system can be applied to human body physiological health monitoring, micro pulse feeling sensing application research is developed, real-time monitoring of pulse wave physiological parameters of human body radial artery is achieved, a relation model of typical diseases and pulse condition characteristic indexes is established, and the system is used for achieving practical application of traditional Chinese medicine remote diagnosis and health assessment and the like.
Correspondingly, the embodiment of the invention also provides a pressure sensor system based on the integrated active power supply flexible pressure sensor, which comprises a pressure sensing module for sensing pressure change; the wireless signal output module is used for converting the pressure change signal sensed by the pressure sensing module into an electric signal to be output; and the power battery module is used for supplying power to the pressure sensing module and the wireless signal output module.
The following description will be given with reference to specific examples.
Example 1
An integrated active power supply flexible pressure sensor comprises a power unit with a sandwich structure and a sensing unit with a sandwich structure which are arranged in a stacked mode, and further comprises a wireless signal output unit connected with the sensor, wherein the power unit supplies power to the sensing unit and the wireless signal output unit,
in the power unit, the power unit is a zinc-air battery and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, wherein the anode is a flexible zinc-containing electrode, the gel electrolyte is ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel, and the flexible air electrode is a silver/conductive carbon electrode; in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride to polyvinyl alcohol to polyethylene glycol diacrylate to water is 20:10:20: 100; the thickness of the power unit is 0.5 mm; wherein the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer is prepared by the following method: dissolving ammonium chloride, polyvinyl alcohol and polyethylene glycol diacrylate in water according to the weight ratio of the substances to obtain a viscous mixture; and adding 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide serving as a photoinitiator into the viscous mixture, and reacting under the ultraviolet irradiation condition to prepare the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel.
The sensing unit comprises a negative electrode, a positive electrode and a conductive fiber paper layer, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive fiber paper layer is clamped between the positive electrode and the negative electrode, the sensing unit takes a flexible zinc-containing electrode of the power unit as the negative electrode, and the conductive fiber paper contains PEDOT: PSS fiber paper; the positive electrode is a silver electrode.
The power unit of the integrated active power supply flexible pressure sensor prepared in the embodiment 1 is subjected to performance test, the open-circuit voltage and the short-circuit current of the power unit are shown in fig. 3, and the bending test result is shown in fig. 4; driving the electronic watch as shown in fig. 5; the results of driving the LEDs are shown in fig. 6, the single cell driving the LED lamp through the boost module and the free bending process stability is shown in fig. 7. The result shows that the power unit of the integrated active power supply flexible pressure sensor, namely the flexible zinc-air battery, has good electrical property, and particularly, the maximum power per unit area is about 40mW/cm2Has flexibility of bending 180 degrees and better stability.
Example 2
The integrated active power supply flexible pressure sensor prepared in example 1 is respectively used for pulse beat tests of the wrist, the neck and the instep of a human body, and the result is shown in fig. 8.
As can be seen from the figure, the integrated active power supply flexible pressure sensor provided by the embodiment of the invention can accurately detect the pulse beats of different parts of a human body.
Example 3
A fully flexible integrated active power supply pressure sensor comprises a power unit with a sandwich structure and a sensing unit with a sandwich structure which are arranged in a stacked mode, and further comprises a wireless signal output unit connected with the sensor, wherein the power unit supplies power to the sensing unit and the wireless signal output unit,
in the power unit, the power unit is a zinc-air battery and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, the anode is a zinc powder/conductive cloth electrode, the gel electrolyte layer is an ammonium chloride/polyvinyl alcohol/ionic liquid gel electrolyte coated by woven cloth, and the weight ratio of the ammonium chloride to the polyvinyl alcohol to the ionic liquid to water is 1-3: 1-2: 1-3: 10; the thickness of the ammonium chloride/polyvinyl alcohol/ionic liquid gel electrolyte layer is 0.15 mm-0.25 mm; the cathode is a flexible air electrode which is a silver/conductive cloth electrode.
The sensing unit comprises a negative electrode, a positive electrode and a conductive woven cloth, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive woven cloth is clamped between the positive electrode and the negative electrode, the sensing unit takes a flexible zinc-containing electrode of the power unit as the negative electrode, and the conductive woven cloth contains PEDOT: woven cloth of PSS; the positive electrode is a silver/conductive cloth electrode.
The power unit of the integrated active power supply flexible pressure sensor prepared in the embodiment 3 is subjected to performance test, and the obtained battery has the open-circuit voltage of about 1.1v, the short-circuit current of about 20mA and the maximum power per unit area of about 20mW/cm2。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (13)
1. An integrated active power supply flexible pressure sensor comprises a sensing unit with a sandwich structure and a power unit which is arranged in a stacking way with the sensing unit and is used for supplying power to the sensing unit, and is characterized in that,
the power unit is a zinc-air battery with a sandwich structure and comprises an anode and a cathode which are oppositely arranged, and a gel electrolyte clamped between the cathode and the anode, wherein the anode is a flexible zinc-containing electrode, the gel electrolyte is selected from one of ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, ammonium chloride/polyvinyl alcohol/ionic liquid gel coated by fiber paper or woven cloth, and potassium chloride/polyvinyl alcohol/ionic liquid gel coated by fiber paper or woven cloth, and the cathode is a flexible air electrode;
the sensing unit comprises a negative electrode, a positive electrode and conductive fiber paper or conductive woven cloth, wherein the negative electrode and the positive electrode are oppositely arranged, the conductive fiber paper or the conductive woven cloth is clamped between the positive electrode and the negative electrode, and the sensing unit takes the flexible zinc-containing electrode of the power unit as the negative electrode.
2. The integrated active power supply flexible pressure sensor according to claim 1, wherein in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 10-25: 5-10: 15-25: 100; or
In the potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of potassium chloride to polyvinyl alcohol to polyethylene glycol diacrylate to water is 10-25: 5-10: 15-25: 100; or
In the ammonium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or woven cloth, the weight ratio of the ammonium chloride to the polyvinyl alcohol to the ionic liquid to the water is 1-3: 1-2: 1-3: 10; or
In the potassium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or woven cloth, the weight ratio of potassium chloride to polyvinyl alcohol to ionic liquid to water is 1-3: 1-2: 1-3: 10.
3. The integrated active power supply flexible pressure sensor as claimed in claim 2, wherein in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 20:10:20: 100; or
In the potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of potassium chloride to polyvinyl alcohol to polyethylene glycol diacrylate to water is 20:10:20: 100.
4. The integrated actively powered flexible pressure sensor of any of claims 1 to 3 wherein the thickness of the gel electrolyte is between 0.2mm and 0.4 mm.
5. The integrated actively powered flexible pressure sensor of claim 1 wherein the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer is prepared by the following method: dissolving ammonium chloride, polyvinyl alcohol and polyethylene glycol diacrylate in water to obtain a viscous mixture; adding 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide serving as a photoinitiator into the viscous mixture, and reacting under the ultraviolet irradiation condition to prepare ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel; or
The potassium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer is prepared by the following method: dissolving potassium chloride, polyvinyl alcohol and polyethylene glycol diacrylate in water to obtain a viscous mixture; adding 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide serving as a photoinitiator into the viscous mixture, and reacting under the ultraviolet irradiation condition to prepare ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate-based polymer hydrogel; or
The ammonium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or the woven cloth is prepared by the following method: providing ammonium chloride, polyvinyl alcohol and ionic liquid, dissolving the ammonium chloride, the polyvinyl alcohol and the ionic liquid in water to form gel, and dipping the fiber paper or the woven cloth in the ionic gel to prepare an ionic gel electrolyte layer; or
The potassium chloride/polyvinyl alcohol/ionic liquid gel coated on the fiber paper or the woven cloth is prepared by the following method: providing potassium chloride, polyvinyl alcohol and ionic liquid, dissolving the potassium chloride, the polyvinyl alcohol and the ionic liquid in water to form gel, and dipping the fiber paper or the woven cloth in the ionic gel to prepare the ionic gel electrolyte layer.
6. The integrated actively-powered flexible pressure sensor of claim 1, wherein in the power unit, the flexible zinc-containing electrode is selected from one of zinc foil, zinc powder/conductive carbon paper, zinc powder/conductive cloth; and/or
The flexible air electrode is selected from silver/conductive carbon paper electrode, silver/conductive cloth electrode, MnO2Conductive carbon paper electrode, MnO2In the air electrode, a metal or a metal oxide is coated on a conductive carbon paper or a conductive cloth, and the metal or the metal oxide is disposed adjacent to the gel electrolyte.
7. The integrated actively-powered flexible pressure sensor of claim 1, wherein the power unit has a thickness of 1mm or less.
8. The integrated actively powered flexible pressure sensor of claim 1 wherein in the sensing unit, the conductive fiber paper is fiber paper coated with a conductive material, the conductive woven fabric is woven fabric coated with a conductive material, and the conductive material is selected from PEDOT: PSS, graphene, conductive carbon.
9. The integrated actively powered flexible pressure sensor of claim 8 wherein the conductive fiber paper is prepared by: providing a conductive material solution and fiber paper, and soaking the fiber paper in the conductive material solution to obtain conductive fiber paper; or
The preparation method of the conductive woven cloth comprises the following steps: providing a conductive material solution and woven cloth, and soaking the woven cloth in the conductive material solution to obtain the conductive woven cloth.
10. The integrated actively-powered flexible pressure sensor of claim 1 wherein the positive electrode in the sensing cell is a silver-containing electrode.
11. The integrated actively powered flexible pressure sensor of claim 1 further comprising a wireless signal output unit connected to said sensor, and wherein said power unit powers said sensing unit and said wireless signal output unit.
12. The integrated actively powered flexible pressure sensor of claim 1 further comprising a wireless signal output unit connected to said sensor and said power unit powers said sensing unit and said wireless signal output unit, wherein,
in the power unit, the air electrode is a silver/conductive carbon paper electrode; the anode is a zinc foil electrode; the gel electrolyte is ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, and in the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel, the weight ratio of ammonium chloride, polyvinyl alcohol, polyethylene glycol diacrylate and water is 10-25: 5-10: 15-25: 100; the thickness of the ammonium chloride/polyvinyl alcohol/polyethylene glycol diacrylate based polymer hydrogel is 0.25 mm-0.35 mm; and the thickness of the power unit is 0.5 mm;
in the sensing unit, the conductive fiber paper is a paper with PEDOT: PSS fiber paper; the positive electrode is a silver electrode.
13. The integrated actively powered flexible pressure sensor of claim 1 further comprising a wireless signal output unit connected to said sensor and said power unit powers said sensing unit and said wireless signal output unit, wherein,
in the power unit, the air electrode is a silver/conductive cloth electrode; the anode is a zinc powder/conductive cloth electrode; the gel electrolyte is ammonium chloride/polyvinyl alcohol/ionic liquid gel coated by woven cloth, and the weight ratio of the ammonium chloride, the polyvinyl alcohol, the ionic liquid and the water in the ammonium chloride/polyvinyl alcohol/ionic liquid gel coated by the woven cloth is 1-3: 1-2: 1-3: 10; the thickness of the ammonium chloride/polyvinyl alcohol/ionic liquid gel electrolyte layer is 0.15 mm-0.25 mm; and the thickness of the power unit is 0.5 mm;
in the sensing unit, the conductive woven fabric is a fabric with a surface containing PEDOT: woven cloth of PSS; the positive electrode is a silver/conductive cloth electrode.
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