CN112014005A - Graphite-based piezoresistive flexible pressure sensor and preparation method thereof - Google Patents
Graphite-based piezoresistive flexible pressure sensor and preparation method thereof Download PDFInfo
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- CN112014005A CN112014005A CN202010853766.XA CN202010853766A CN112014005A CN 112014005 A CN112014005 A CN 112014005A CN 202010853766 A CN202010853766 A CN 202010853766A CN 112014005 A CN112014005 A CN 112014005A
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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Abstract
The invention discloses a graphite-based piezoresistive flexible pressure sensor and a preparation method thereof, and the sensor comprises a body, wherein a wearing ring is connected to the outside of the body, a flexible mechanism is arranged at the top of the body, an upper sealing plate is arranged inside the flexible mechanism, a first electrode is fixedly arranged at the bottom end of the upper sealing plate, the bottom of the first electrode is connected with graphite, the bottom end of the graphite is provided with PET (polyethylene terephthalate), the bottom of the PET is connected with a second electrode, the bottom end of the second electrode is fixedly provided with a lower sealing plate, the bottom end of the first electrode is connected with a sensitive mechanism, and a disassembling and assembling mechanism is arranged on the outer. According to the invention, under the action of the flexible mechanism, graphite is arranged on the surface layer of the PET through the graphite arranged on the first electrode and the second electrode bracket, and the PET is made of flexible material, so that the graphite is transferred to the PET layer after being cured, and the structure of the body is formed by the graphite, the PET and the electrodes, thereby improving the flexibility and reliability of the body, facilitating the body and the human body to be attached, and realizing the real-time measurement of the human body pressure.
Description
Technical Field
The invention relates to the technical field of pressure detection, in particular to a graphite-based piezoresistive flexible pressure sensor and a preparation method thereof.
Background
With the continuous progress of mechanical sensor technology, the development of pressure sensors is promoted. The piezoresistive pressure sensor has the characteristics of simple structure, convenient signal processing, easy integration and data output and the like, and becomes a main device for micro pressure measurement. The piezoresistive pressure sensor generally comprises a substrate, a sensitive layer and a lead, the flexibility of the sensor is determined by the substrate and the sensitive layer, the performances of the sensitivity and the like of the sensor are also influenced by the piezoresistive property, the electric conductivity and the like of the sensitive layer made of sensitive materials, the surfaces of various human body parts such as eyeballs, wrists, nasal cavities, necks and the like are all curved surfaces, and the high-flexibility pressure sensor is required to realize measurement.
The existing piezoresistive pressure sensor cannot bend a pressure sensor to keep the flexibility of the pressure sensor, and is not provided with a mechanism for improving pressure sensitivity and improving reaction speed when the pressure sensor is used, and is not provided with a mechanism for facilitating disassembly and assembly of the pressure sensor when the pressure sensor is used, and cannot be used for detecting a human body by firmly connecting the pressure sensor and the human body part, so that the piezoresistive pressure sensor is poor in flexibility and low in reaction efficiency.
Disclosure of Invention
The invention aims to solve the defects that the flexibility of a pressure sensor cannot be kept by bending the pressure sensor when the existing piezoresistive pressure sensor is used, the pressure sensitivity is improved and the reaction speed is increased when the existing piezoresistive pressure sensor is used, the pressure sensor cannot be conveniently disassembled and assembled when the existing piezoresistive pressure sensor is used, the pressure sensor cannot be firmly connected with a human body part so as to be convenient for detecting the human body, and the flexibility of the piezoresistive pressure sensor is poor and the reaction efficiency is low.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a graphite base piezoresistive flexible pressure sensor, includes the body, the ring is worn to body external connection, and installs flexible mechanism at the body top, flexible mechanism is inside including last shrouding, and goes up shrouding bottom fixed mounting and have first electrode, first electrode bottom is connected with graphite, and the graphite bottom installs PET, the PET bottom is connected with the second electrode, second electrode bottom fixed mounting has down the shrouding, and is connected with sensitive dismouting mechanism in the first electrode bottom, dismouting mechanism is installed in the body outside, wear ring one side and be connected with detection mechanism.
As a further description of the above technical solution:
the central axis of the first electrode coincides with the central axis of the graphite, and the cross-sectional area of the first electrode coincides with the cross-sectional area of the second electrode.
As a further description of the above technical solution:
the sensitive mechanism comprises a polymer base plate, an isolation layer is arranged on the top of the polymer base plate, and a conductive hole is formed in the isolation layer.
As a further description of the above technical solution:
the cross-sectional area of the polymer base plate is coincident with the cross-sectional area of the first electrode, and the central axis of the polymer base plate is coincident with the central axis of the isolation layer.
As a further description of the above technical solution:
the inside of dismouting mechanism is including the cardboard, and cardboard one side is connected with the loose axle, the clamp splice is installed to the loose axle opposite side, and the clamp splice top is connected with the torsional spring.
As a further description of the above technical solution:
the clamping block and the clamping plate form a movable structure through the movable shaft, and the clamping block and the clamping plate form an elastic structure through the torsion spring.
As a further description of the above technical solution:
the inside of detection mechanism is including the bleeder vent, and bleeder vent external connection has the magic and pastes the sub-face, the elastic webbing is installed to magic subsides sub-face opposite side, and elastic webbing outside fixedly connected with magic subsides female face.
As a further description of the above technical solution:
female face is pasted to magic passes through the elastic webbing and constitutes elastic construction between the ring of dressing, and the female face of magic subsides passes through the magic and pastes the son face and dress and constitute fixed knot structure between the ring.
A preparation method of a graphite-based piezoresistive flexible pressure sensor mainly comprises the following 4 steps: step 1: fix the body inside the cardboard through clamp splice, torsional spring, step 2: will dress the ring and laminate fixedly, step 3 through magic tape surface, magic tape mother face and human body: connecting the bottom of the graphite with PET, and step 4: the graphite base is used for sensing the human body pressure.
The details of step 1 are as follows: the body is fixed inside the clamping plate through the clamping block and the torsion spring, and the clamping block tightly supports the body under the elastic action of the torsion spring;
the details of the step 2 are as follows: the wearing ring is attached and fixed with the human body through the magic tape surface and the magic tape mother surface, so that the body can conveniently perform pressure induction on the human body;
the details of step 3 are as follows: the graphite bottom is connected with the PET, so that high sensitivity of pressure induction can be realized, and the response time is prolonged;
the details of the step 4 are as follows: the wearing ring is used for fixing and wearing the human body part, and the graphite base is used for sensing the human body pressure, so that the human body pressure is monitored.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, under the action of the flexible mechanism, graphite is arranged on the surface layer of the PET through the graphite arranged on the first electrode and the second electrode bracket, and the PET is made of flexible material, so that the graphite is transferred to the PET layer after being cured, and the structure of the body is formed by the graphite, the PET and the electrodes, thereby improving the flexibility and reliability of the body, facilitating the body and the human body to be attached, and realizing the real-time measurement of the human body pressure.
2. According to the invention, under the action of a sensitive mechanism, the first electrode at the top of the conductive hole is covered, graphite is dispersed to the polymer base plate by adopting a water-in-oil emulsion method, water evaporation is completed by solidifying a polymer, so that an elastic structure is formed, the surface of the structure is covered with graphite, so that a sandwich structure is formed, energy band change is intensified by graphite concentration, so that the sensitivity of the body is greatly improved, and the reaction efficiency is effectively improved.
3. According to the invention, under the action of the dismounting mechanism, the body is fixed in the clamping plate, and under the elastic action of the torsion spring, the clamping blocks clamp and fix two sides of the body, so that the body is fixed in the wearing ring, and a user can use the body through the wearing ring conveniently.
4. According to the invention, under the action of the detection mechanism, the magic tape female surface is in fit connection with the magic tape male surface, so that the wearing ring can be fixed on the human body part, the body can perform pressure detection on all parts of the human body, the wearing ring can be wider in application range under the action of the elastic band, the body can conveniently detect different parts, and meanwhile, the wearing ring is convenient for different people to use.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the flexible mechanism of the present invention;
FIG. 3 is a schematic structural diagram of a sensing mechanism according to the present invention;
FIG. 4 is a schematic view showing the structure of the detaching mechanism in the present invention;
FIG. 5 is a schematic structural diagram of the detecting mechanism of the present invention.
Illustration of the drawings:
1. a body; 2. wearing a ring; 3. a flexible mechanism; 301. an upper sealing plate; 302. a first electrode; 303. graphite; 304. PET; 305. a second electrode; 306. a lower sealing plate; 4. a sensitive mechanism; 401. a polymeric base sheet; 402. an isolation layer; 403. a conductive via; 5. a disassembly and assembly mechanism; 501. clamping a plate; 502. a movable shaft; 503. a clamping block; 504. a torsion spring; 6. a detection mechanism; 601. air holes are formed; 602. a magic tape surface; 603. an elastic band; 604. the magic is pasted on the mother surface.
Detailed Description
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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, a graphite-based piezoresistive flexible pressure sensor comprises a body 1, a wearing ring 2, a flexible mechanism 3, an upper sealing plate 301, a first electrode 302, graphite 303, PET304, a second electrode 305, a lower sealing plate 306, a sensitive mechanism 4, a polymer base plate 401, an isolation layer 402, a conductive hole 403, a dismounting mechanism 5, a clamping plate 501, a movable shaft 502, a clamping block 503, a torsion spring 504, a detection mechanism 6, a vent hole 601, a magic tape surface 602, an elastic band 603 and a magic tape mother surface 604, wherein the wearing ring 2 is connected to the outside of the body 1, the flexible mechanism 3 is installed at the top of the body 1, the upper sealing plate 301 is included in the flexible mechanism 3, the first electrode 302 is fixedly installed at the bottom end of the upper sealing plate 301, the graphite 303 is connected to the bottom of the first electrode 302, the PET304 is installed at the bottom end of the graphite 303, the second electrode 305 is connected to the bottom end of the PET304, the, and first electrode 302 bottom is connected with sensitive mechanism 4, and dismouting mechanism 5 is installed to the body 1 outside, wears ring 2 one side and is connected with detection mechanism 6, presss from both sides PET304 between two electrically conductive flexible electrodes in top and bottom to form a sandwich structure, obtain complete capacitive sensor.
Further, the central axis of the first electrode 302 coincides with the central axis of the graphite 303, and the cross-sectional area of the first electrode 302 coincides with the cross-sectional area of the second electrode 305, the body 1 is prepared by using the graphite 303, the process is simple, the material is cheap, and high-sensitivity curved surface force sensing is realized by connecting with an elastic foam material with ultrahigh pressure sensitivity.
Furthermore, the inside of the sensitive mechanism 4 includes a polymer base plate 401, and an isolation layer 402 is mounted on the top of the polymer base plate 401, and a conductive hole 403 is opened inside the isolation layer 402, so that the surface of the structure is covered with the graphite 303 because the first electrode 302 is covered on the top of the conductive hole 403.
Further, the cross-sectional area of the polymer base 401 coincides with the cross-sectional area of the first electrode 302, and the central axis of the polymer base 401 coincides with the central axis of the isolation layer 402, and the polymer base 401 disperses the graphite 303 to the polymer base 401 by using a water-in-oil emulsion method, and water evaporation is completed by curing the polymer, thereby forming an elastic structure.
Further, dismouting mechanism 5's inside is including cardboard 501, and cardboard 501 one side is connected with loose axle 502, and clamp splice 503 is installed to loose axle 502 opposite side, and the clamp splice 503 top is connected with torsional spring 504, and cardboard 501 makes the user dismouting of being convenient for when using, has made things convenient for simultaneously to taking in of body 1, is convenient for change or adjust when using body 1 among the different crowds.
Further, clamp splice 503 constitutes the active structure through loose axle 502 and cardboard 501, and clamp splice 503 passes through torsional spring 504 and cardboard 501 constitution elastic construction, under the elastic action of torsional spring 504, makes clamp splice 503 press from both sides tight fixedly to body 1 both sides to make body 1 dress ring 2 inside fixed, thereby make the user be convenient for use body 1 through wearing ring 2.
Further, the inside of detection mechanism 6 is including bleeder vent 601, and bleeder vent 601 external connection has magic tape surface 602, and elastic tape 603 is installed to magic tape surface 602 opposite side, and elastic tape 603 outside fixedly connected with magic tape female face 604, and bleeder vent 601 can make to dress ring 2 and human body connection and keep the gas permeability to improve the comfort level when body 1 detects.
Further, female face 604 is pasted to magic passes through the elastic webbing 603 and constitutes elastic construction between the wearing ring 2, and the female face 604 is pasted to magic passes through the magic and pastes sub-face 602 and constitutes fixed knot between the wearing ring 2, under the effect of elastic webbing 603, can make the application range who wears ring 2 wider, and the body 1 of being convenient for has made things convenient for different crowds' use to the detection at different positions simultaneously.
A preparation method of a graphite-based piezoresistive flexible pressure sensor mainly comprises the following 4 steps: step 1: fixing the body 1 inside the clamping plate 501 through the clamping block 503 and the torsion spring 504, and step 2: will wear ring 2 and paste fixedly, step 3 through magic subsides son face 602, magic subsides mother face 604 and human body and come into contact with: connecting the bottom of the graphite 303 with the PET304, step 4: the graphite 303 base is used for sensing the human body pressure.
The details of step 1 are as follows: the body 1 is fixed inside the clamping plate 501 through the clamping block 503 and the torsion spring 504, and under the elastic action of the torsion spring 504, the clamping block 503 tightly supports the body 1;
the details of step 2 are as follows: the wearing ring 2 is attached and fixed with the human body through the magic tape surface 602 and the magic tape female surface 604, so that the body 1 can conveniently perform pressure induction on the human body;
details of step 3 are as follows: the bottom of the graphite 303 is connected with the PET304, so that high sensitivity of pressure induction can be realized, and the response time is improved;
the details of step 4 are as follows: the ring 2 is worn on the human body part in a fixed mode, and the graphite 303 base is used for sensing the human body pressure, so that the human body pressure is monitored.
The working principle is as follows: when in use, the body 1 is fixed inside the clamping plate 501, under the elastic action of the torsion spring 504, the clamping blocks 503 are used for clamping and fixing two sides of the body 1, so that the body 1 is fixed inside the wearing ring 2, so that a user can use the body 1 through the wearing ring 2, the hook and loop female surface 604 is attached and connected with the hook and loop sub surface 602 through the hook and loop sub surface, so that the wearing ring 2 can be fixed at the human body part, so that the body 1 can carry out pressure detection on all parts of the human body, because the first electrode 302 at the top of the conductive hole 403 is covered, through adopting a water-in-oil emulsion method, the graphite 303 is dispersed to the polymer bottom plate 401, the water evaporation is completed through the solidified polymer, so that an elastic structure 303 is formed, the structure surface is covered with the graphite, so that a sandwich structure is formed, the energy band change is intensified, so that the sensitivity of the body 1 is greatly improved, the working principle of the present invention is thus completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a graphite base piezoresistive flexible pressure sensor, includes body (1), its characterized in that, body (1) external connection has wears ring (2), and body (1) top installs flexible mechanism (3), flexible mechanism (3) are inside including last shrouding (301), and go up shrouding (301) bottom fixed mounting have first electrode (302), first electrode (302) bottom is connected with graphite (303), and installs PET (304) in graphite (303) bottom, PET (304) bottom is connected with second electrode (305), shrouding (306) under second electrode (305) bottom fixed mounting has, and first electrode (302) bottom is connected with sensitive mechanism (4), dismouting mechanism (5) are installed in the body (1) outside, it is connected with detection mechanism (6) to wear ring (2) one side.
2. A graphite-based piezoresistive flexible pressure sensor according to claim 1, wherein the central axis of the first electrode (302) coincides with the central axis of the graphite (303), and the cross-sectional area of the first electrode (302) coincides with the cross-sectional area of the second electrode (305).
3. The graphite-based piezoresistive flexible pressure sensor according to claim 1, wherein the inside of the sensitive mechanism (4) comprises a polymer base plate (401), an isolating layer (402) is mounted on the top of the polymer base plate (401), and a conductive hole (403) is formed in the isolating layer (402).
4. A graphite-based piezoresistive flexible pressure sensor according to claim 3, wherein the cross-sectional area of the polymer substrate (401) coincides with the cross-sectional area of the first electrode (302), and the central axis of the polymer substrate (401) coincides with the central axis of the isolating layer (402).
5. The graphite-based piezoresistive flexible pressure sensor according to claim 1, wherein the dismounting mechanism (5) comprises a clamping plate (501), a movable shaft (502) is connected to one side of the clamping plate (501), a clamping block (503) is installed on the other side of the movable shaft (502), and a torsion spring (504) is connected to the top of the clamping block (503).
6. The graphite-based piezoresistive flexible pressure sensor according to claim 5, wherein the clamping block (503) and the clamping plate (501) form a movable structure through a movable shaft (502), and the clamping block (503) and the clamping plate (501) form an elastic structure through a torsion spring (504).
7. The graphite-based piezoresistive flexible pressure sensor according to claim 1, wherein the detection mechanism (6) comprises an air hole (601), a magic tape surface (602) is connected to the outside of the air hole (601), an elastic band (603) is installed on the other side of the magic tape surface (602), and a magic tape female surface (604) is fixedly connected to the outer side of the elastic band (603).
8. The graphite-based piezoresistive flexible pressure sensor according to claim 7, wherein the hook and loop fastener female surface (604) forms an elastic structure with the wearing ring (2) through the elastic band (603), and the hook and loop fastener female surface (604) forms a fixed structure with the wearing ring (2) through the hook and loop fastener male surface (602).
9. A preparation method of a graphite-based piezoresistive flexible pressure sensor is characterized by mainly comprising the following 4 steps: step 1: fixing the body (1) inside the clamping plate (501) through the clamping block (503) and the torsion spring (504), and step 2: will wear ring (2) and paste fixedly, step 3 through magic subsides son face (602), magic subsides mother face (604) and human body and come into contact: connecting the bottom of the graphite (303) with the PET (304), and step 4: the graphite (303) base is used for sensing the human body pressure.
10. The method for preparing a graphite-based piezoresistive flexible pressure sensor according to claim 9, wherein the details of step 1 are as follows: the body (1) is fixed inside the clamping plate (501) through the clamping block (503) and the torsion spring (504), and under the elastic action of the torsion spring (504), the clamping block (503) abuts against the body (1);
the details of the step 2 are as follows: the wearing ring (2) is attached and fixed with the human body through the magic tape surface (602) and the magic tape female surface (604), so that the body (1) can conveniently perform pressure induction on the human body;
the details of step 3 are as follows: the graphite (303) bottom is connected with the PET (304), so that high sensitivity of pressure induction can be realized, and the response time is improved;
the details of the step 4 are as follows: the human body part is fixedly worn through the wearing ring (2), and the pressure of the human body is sensed by utilizing the graphite (303) base, so that the pressure of the human body is monitored.
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| CN202010853766.XA CN112014005B (en) | 2020-08-24 | 2020-08-24 | Graphite-based piezoresistive flexible pressure sensor and preparation method thereof |
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| CN202010853766.XA CN112014005B (en) | 2020-08-24 | 2020-08-24 | Graphite-based piezoresistive flexible pressure sensor and preparation method thereof |
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| CN112014005B CN112014005B (en) | 2022-04-22 |
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| CN211049325U (en) * | 2019-11-19 | 2020-07-21 | 西安培华学院 | Old nursing is with good pulse monitoring bracelet of travelling comfort |
| CN111562038A (en) * | 2020-06-16 | 2020-08-21 | 厦门大学 | Flexible capacitive pressure sensor and flexible capacitive pressure array sensor |
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2020
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| CN106618521A (en) * | 2016-10-24 | 2017-05-10 | 合肥工业大学 | Wearable wrist integrated sensor based on PVDF piezoelectric film and preparation method of wearable wrist integrated sensor |
| KR20180065706A (en) * | 2016-12-08 | 2018-06-18 | 서성철 | Wearable wrist battery |
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