CN111998977A - High-sensitivity flexible wearable sensor array and preparation method thereof - Google Patents
High-sensitivity flexible wearable sensor array and preparation method thereof Download PDFInfo
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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
- G01L1/18—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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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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Abstract
The invention discloses a high-sensitivity flexible wearable sensor array and a preparation method thereof, relates to the field of preparation of flexible wearable equipment, and aims to solve the problems of low sensitivity, high cost, small quantity of detection and recording signals and single function of the conventional wearable sensor. According to the invention, multiple orthogonal wires are equidistantly arranged on two sides of a force-sensitive film in a knitting mode to form a sandwich-shaped structure; respectively sticking a layer of double-sided transparent adhesive tape on the outer side of the lead; finally, respectively sticking a layer of insulating film. The sensor array is prepared by lamination. The invention has the advantages of simple preparation process, low cost, high sensitivity, capability of simultaneously obtaining and recording a large number of tactile signals, flexibility and stretchability, and applicability to monitoring and recording the tactile signals of a plurality of parts of a human body. The invention is applied to the field of flexible wearable equipment preparation.
Description
Technical Field
The invention relates to the field of sensor array preparation, in particular to a high-sensitivity flexible wearable sensor array and a preparation method thereof.
Background
The pressure sensor is used for measuring mechanical parameters such as pressure and stress on the surface of an object, and is one of the most widely used sensors. As one of the most important pressure sensors, a piezoresistive sensor is a sensor manufactured by using piezoresistive effect of a material and an integrated circuit technology, and when a force is applied, the resistivity of the sensor changes, and an electric signal proportional to the force change is obtained through a measuring circuit. Piezoresistive sensors are widely used due to their characteristics of low cost, good responsiveness, etc. However, in practical applications, since the measured object has complicated appearance characteristics and the surface pressure distribution state has large differences, a single sensor cannot simultaneously acquire a large amount of tactile information.
In recent years, with the rise of wearable flexibility, the wearable flexible piezoresistive sensor has a huge market in human-computer interaction and human health monitoring, and the wearable flexible piezoresistive sensor as a typical representative of wearable equipment occupies a great position in the development of wearable electronic devices in the future. However, wearable piezoresistive sensors are significantly less than user satisfaction due to high manufacturing costs, poor accuracy, poor stability, and single signal acquisition. For example, a large number of sensors are arranged on the hand of a human, and a large number of tactile signals of an external object are sensed and recorded through the tactile sensors, so that the shape and the weight of the object are sensed, the material property of the object is judged, and actions such as grabbing are realized. However, current robotic arms are difficult to implement and replicate this behavior, primarily because of the current difficulty in obtaining and recording large numbers of haptic signals. The preparation of piezoresistive sensors into sensor arrays, which can simultaneously obtain and record a large number of tactile signals, is considered as a future development trend of wearable piezoresistive sensors. However, the current sensor array has the problems of low precision, poor sensitivity, poor stability, complex process, high preparation cost and the like. Based on this, in order to improve wearable flexible piezoresistive sensor precision, sensitivity and stability to and acquire and record a plurality of pressure signals simultaneously, a high sensitivity flexible wearable sensor array needs to be developed to present letter to accord with the high requirement of wearable electronic equipment to piezoresistive sensitivity and complicated signal acquisition record, in order to satisfy the urgent needs in market.
Disclosure of Invention
The invention aims to solve the problems of low sensitivity, high cost, small quantity of detection and recording signals and single function of the conventional wearable sensor, and provides a high-sensitivity flexible wearable sensor array and a preparation method thereof, which can detect the tiny pressure of 50 mN-1N, and has the advantages of sensitivity>150KPa-1Relaxation time of<10 mS. The sensor array is prepared by laminating a force-sensitive film, an orthogonal wire, an adhesive tape and an insulating film; and sensing the resistivity change response of the force-sensitive film through the overlapping area between the multiple rows and the multiple columns of electrodes to further obtain the high-sensitivity flexible wearable sensor array.
The invention relates to a high-sensitivity flexible wearable sensor array, which consists of row leads, force-sensitive films, column leads, double-sided transparent adhesive tapes, insulating films and wire arrangement holes, wherein the row leads are arranged on the two sides of the row leads;
the row conducting wires and the column conducting wires are arranged on the upper side and the lower side of the force sensitive film, the double-sided transparent adhesive tapes are respectively laid on the upper surface and the lower surface of the row conducting wires and the column conducting wires, and the insulating films are respectively laid on the double-sided transparent adhesive tapes; the wire arranging holes are respectively arranged at two sides of the row wires and the column wires.
The wire arranging holes are arranged at two sides of the row and column wires, small holes are carved by a laser ablation method, and then the wires are fixed by left and right insertion in a knitting mode.
The invention discloses a high-sensitivity flexible wearable sensor array method, which is carried out according to the following steps:
preparation of force-sensitive film
1) Preparation of carbon black dispersion: ultrasonically dispersing carbon black and a dispersing agent for 30-60 min by using an ultrasonic dispersing machine to obtain a uniform carbon black dispersion liquid for later use;
2) preparing a polyurethane solution: ultrasonically dispersing polyurethane and a dispersing agent for 30-60 min by using an ultrasonic dispersing machine to obtain a uniform polyurethane solution for later use;
3) preparing a conductive carbon black-polyurethane composite material: ultrasonically dispersing the carbon black dispersion liquid prepared in the step 1) and the polyurethane solution prepared in the step 2) for 10-20 min, adding tin oxide powder, continuously ultrasonically dispersing for 30-60 min, and stirring for 30-40 min by using a vacuum planetary stirrer; performing ultrasonic dispersion for 30-60 min, stirring for 30-40 min, and repeating the steps for 5 times to obtain a uniformly dispersed conductive carbon black-polyurethane composite material;
4) preparing a conductive carbon black-polyurethane force-sensitive film: vacuum drying the conductive carbon black-polyurethane composite material obtained in the step 3) at 80-90 ℃ for 2h, preparing a force-sensitive film by using an automatic film making machine, and curing the prepared film at 105-115 ℃ for 4h to finally obtain the force-sensitive film;
second, lead arrangement
1) Punching a force-sensitive film: etching orthogonal holes on the force-sensitive film by using a laser cutting machine;
2) a plurality of row conductors and a plurality of column conductors are arranged on the upper side and the lower side of the force-sensitive film at equal intervals in a knitting mode to form an orthogonal electrode array, and finally a sandwich structure of a plurality of row conductors, the force-sensitive film and a plurality of column conductors is formed;
sensor array assembly
Respectively sticking a layer of double-sided transparent adhesive tape on two sides of the sandwich structure in the step two, and finally respectively sticking a layer of insulating film on the outer side of the transparent adhesive tape;
fourth, expose the wire encapsulation process
The exposed wire was insulated with PDMS: PDMS was uniformly coated on the exposed surface of the conductive wire, cured at 60 ℃ for 2h, and then left at room temperature for 12 h.
Further, the dispersing agent is DY-9006.
Furthermore, the polyurethane is thermoplastic polyurethane, the tensile strength is more than 70MPa, the elongation at break is as high as 1000%, and the high temperature resistance is more than 120 ℃.
Further, the mass fraction of carbon black in the conductive carbon black-polyurethane composite was 5 wt.%.
Further, the fume tin oxide powder is nano fume tin oxide powder subjected to surface modification treatment by 40% sodium hydroxide solution, and the fume tin oxide powder is prepared bySoaking a proper amount of tin oxide powder and 40% sodium hydroxide solution for 10-20 min, and then ultrasonically cleaning the powder for 20-30 min by using deionized water, wherein the average particle size is 30-50 nm, and the specific surface area is 35m2/kg。
Further, the thickness of the force-sensitive film is 0.1 mm.
Furthermore, the width of the double-sided transparent adhesive tape is 5mm, and the thickness of the double-sided transparent adhesive tape is 0.1 mm.
Further, the insulating film is a polyethylene film and has a thickness of 15 μm.
Further, the PDMS monomer and crosslinker ratio was 15: 1.
The lead is 316L stainless steel metal fiber produced by special rope belt factories containing cores in Dongguan city, resists high temperature of 650 ℃, has a melting point as high as 1350 ℃, and is 64 lines and 64 rows.
The vacuum planetary stirrer is a TMV-200T vacuum defoaming stirrer produced by Simida manufacturers. The tin oxide powder is a modified nano material, promotes the dispersion of carbon black in polyurethane, has an average particle size of 30nm and a specific surface area of 35m2In terms of/kg. The mass fraction of carbon black in the conductive carbon black-polyurethane composite material was 5 wt.%. The thickness of the force-sensitive film is 0.1 mm.
The invention has the following beneficial effects:
1) the high-conductivity carbon black is dispersed in the polyurethane organic solution to prepare the force-sensitive film with high conductivity, high sensitivity and excellent tensile property, the preparation process is simple and efficient, and the low-cost, large-area and batch preparation of the force-sensitive film can be realized.
2) The pressure sensor array is prepared by arranging orthogonal wires on two sides of the force-sensitive film in a knitting mode. The overlapped area between the orthogonal wires can sense the resistance response caused by the pressure change applied to the conductive film, so that a large amount of pressure signals can be obtained and recorded, and more accurate and real tactile information can be recorded.
3) The sensor array can be used for preparing the wearable sensor array suitable for monitoring the tactile signals of multiple positions of a human body by changing the size of the force-sensitive film, the number of orthogonal wires and the type (rigidity) of the insulating film.
4) The sensor array is formed by assembling the force-sensitive film, the metal wire, the double-sided adhesive tape and the insulating film into the wearable sensor array in a laminating mode, and the sensor array has excellent tensile property, high sensitivity, high precision and high stability and can obtain a large amount of touch information. Meanwhile, the sensor array has the advantages of simple process, low cost and the like.
5) The preparation method of the invention can prepare the compound with high sensitivity>150KPa-1) Low relaxation time (<10mS) and a flexible wearable sensor capable of detecting a tiny pressure (50 mN-1N).
In summary, according to the high-sensitivity flexible wearable sensor array and the preparation method thereof, the plurality of wires are orthogonally arranged on two sides of the force-sensitive film in a knitting manner to form a sandwich-shaped structure; respectively sticking a layer of double-sided transparent adhesive tape on the outer side of the lead; and finally, respectively sticking a layer of insulating film, and preparing the sensor array in a laminating way.
Among them, carbon black provides carriers required for electrical conduction, and polyurethane provides excellent stretchability and deformability. When the force-sensitive film deforms under the action of external pressure/stress, the polyurethane can bear carriers to deform, and the distance of the carriers inside the force-sensitive film changes, so that the conductivity of the force-sensitive film changes, and an external force change signal is converted into an electric signal to be output. The highly conductive carbon black used in the invention has very excellent electron transport capability, and the polyurethane has excellent denaturation capability. Therefore, the force-sensitive film of the present invention has excellent sensitivity. In addition, the force-sensitive film is provided with carved holes, which can fix orthogonal wires and increase the deformation capacity of the force-sensitive film to adapt to the complex conditions of external objects. At the same time, the lamination mode further improves the deformability of the sensor array so as to prepare the sensor array as thin as possible. And finally, sensing the resistivity change of the force-sensitive film through the overlapped area between a plurality of rows and a plurality of columns of electrodes by orthogonal wires arranged on two sides of the force-sensitive film to obtain a large amount of touch signals. The technical scheme of the invention has the advantages of simple preparation process, low cost, high sensitivity, capability of simultaneously obtaining and recording a large number of tactile signals, flexibility and stretchability, and applicability to monitoring and recording the tactile signals of a plurality of parts of a human body.
Drawings
FIG. 1 is a flow chart of a process for preparing a force-sensitive film according to the present invention;
FIG. 2 is a schematic view of the arrangement of the stringing holes and orthogonal conductive wires on both sides of the force-sensitive film of the present invention;
FIG. 3 is a schematic diagram of orthogonal wires arranged on both sides of a force-sensitive film according to the present invention;
FIG. 4 is a schematic diagram of a high sensitivity flexible wearable sensor array according to the present invention;
wherein, 1-row conductor; 2-force sensitive film; 3-column conductors; 4-double-sided tape; 5-an insulating film; 6-line arranging holes.
Detailed Description
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
To make the objects, aspects and advantages of the embodiments of the present invention more apparent, the following detailed description clearly illustrates the spirit of the disclosure, and any person skilled in the art, after understanding the embodiments of the disclosure, may make changes and modifications to the technology taught by the disclosure without departing from the spirit and scope of the disclosure.
The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention.
Example 1
A high-sensitivity flexible wearable sensor array and a preparation method thereof are provided, in the embodiment, a force-sensitive film, an orthogonal wire, an adhesive tape and an insulating film are prepared into the sensor array in a laminating way; and sensing the resistance change response force of the force-sensitive film through an overlapping area between 10 rows and 10 columns of electrodes to further obtain the high-sensitivity flexible wearable sensor array.
The technical scheme of the embodiment is specifically prepared by the following steps:
(1) preparation of force-sensitive film
1) Preparation of carbon black dispersion: ultrasonically dispersing carbon black and a dispersing agent for 30-60 min by using an ultrasonic dispersing machine to obtain a uniform carbon black dispersion liquid for later use;
2) preparing a polyurethane solution: ultrasonically dispersing polyurethane and a dispersing agent for 30-60 min by using an ultrasonic dispersing machine to obtain a uniform polyurethane solution for later use;
3) preparing a conductive carbon black-polyurethane composite material: ultrasonically dispersing the carbon black dispersion liquid prepared in the step 1) and the polyurethane solution prepared in the step 2) for 10-20 min, adding tin oxide powder, continuously ultrasonically dispersing for 30-60 min, and stirring for 30-40 min by using a vacuum planetary stirrer; performing ultrasonic dispersion for 30-60 min, stirring for 30-40 min, and repeating the steps for 5 times to obtain a uniformly dispersed conductive carbon black-polyurethane composite material;
4) preparing a conductive carbon black-polyurethane force-sensitive film: vacuum drying the conductive carbon black-polyurethane composite material obtained in the step 3) at 80-90 ℃ for 2h, preparing a force-sensitive film by using an automatic film making machine, and curing the prepared film at 105-115 ℃ for 4h to finally obtain the force-sensitive film. The preparation process of the force-sensitive film is shown in figure 1.
(2) Conductor arrangement
1) Punching a force-sensitive film: as shown in FIG. 2, a laser cutter is used to etch orthogonal holes 6 in the force-sensitive film 2.
2) A plurality of row conductors 1 and a plurality of column conductors 3 are arranged on the upper side and the lower side of the force-sensitive film at equal intervals in a knitting mode to form an orthogonal electrode array, and finally a sandwich structure of a plurality of row conductors-force-sensitive film-a plurality of column conductors is formed, as shown in fig. 3.
(3) Sensor array assembly
As shown in fig. 4, a layer of double-sided transparent adhesive tape 4 is respectively adhered to two sides of the sandwich structure of the plurality of row conductors 1, the force sensitive films 2 and the plurality of column conductors 3 in the step (2); and finally, respectively sticking a layer of insulating film 5 on the outer side of the transparent adhesive tape 4 to assemble the sensor array.
(4) Exposed wire encapsulation process
The exposed wire was insulated with PDMS: PDMS was uniformly coated on the exposed surface of the conductive wire, cured at 60 ℃ for 2h, and then left at room temperature for 12 h.
The dispersant is DY-9006.
The polyurethane is thermoplastic polyurethane, the tensile strength is more than 70MPa, the elongation at break is as high as 1000%, and the high temperature resistance is more than 120 ℃.
The mass fraction of carbon black in the conductive carbon black-polyurethane composite material is 5 wt.%.
The oxidized fume tin powder is nano oxidized fume tin powder subjected to surface modification treatment by 40% sodium hydroxide solution, a proper amount of oxidized fume tin powder and 40% sodium hydroxide solution are soaked for 10min, and then deionized water is used for ultrasonic cleaning for 20 min.
The thickness of the force-sensitive film is 0.1 mm.
The width of the double-sided transparent adhesive tape is 5mm, and the thickness of the double-sided transparent adhesive tape is 0.1 mm.
The insulating film is a polyethylene film and has a thickness of 15 mu m.
The ratio of the PDMS monomer to the cross-linking agent is 15: 1.
The lead is 316L stainless steel metal fiber produced by special rope belt factories containing cores in Dongguan city, resists high temperature of 650 ℃, has a melting point as high as 1350 ℃, and is 64 lines and 64 rows.
The ultrasonic dispersion machine is an ATPIO first European series ultrasonic crusher. The carbon black is VXC-72 high-conductivity carbon black with the specific surface area of 250m2(iv)/g, average particle diameter is 30 nm. The DY-9006 efficient hyper-dispersant is an organic dispersing solvent, the non-volatile content of the organic dispersing solvent is 96 percent, the amine value is 4mg KOH/g, and the density (20 ℃) of the organic dispersing solvent is 1.05 g/mL.
By the technical scheme, the 32 x 32 sensor array can be prepared and can be integrated on commercial gloves to sense the weight, shape and material of an external object.
Example 2
In this example, the mass fraction of carbon black in the conductive film was 6 wt.%; the thickness of the force-sensitive film is 0.2 mm; the insulating film is a polyimide film with the thickness of 30 mu m; the number of the row wires and the number of the column wires are respectively 10, so that a sensor array of 10 multiplied by 10 can be prepared and can be integrated on the insole to sense the sole touch information in the human motion process.
Example 3
In this example, the mass fraction of carbon black in the conductive film was taken as 7 wt.%; the thickness of the force-sensitive film is 0.1 mm; the insulating film is a polytetrafluoroethylene film with the thickness of 10 mu m; the number of the row wires and the number of the column wires are 64 respectively, so that a 64 x 64 sensor array can be prepared and can be integrated on the upper glove, and the touch sensing of the hand is realized when the grabbing action is completed.
Example 4
In this example, the mass fraction of carbon black in the conductive film was 8 wt.%; the thickness of the force-sensitive film is 0.2 mm; the insulating film is a polyester film, and the thickness of the insulating film is 18 mu m; the number of row conductors and column conductors is 10, respectively, and a 10 × 10 sensor array is prepared.
Example 5
In this embodiment, the mass fraction of carbon black in the conductive film is 9 wt.%; the thickness of the force-sensitive film is 0.2 mm; the insulating film is a polyester film, and the thickness of the insulating film is 18 mu m; the number of row conductors and column conductors is 64, respectively, so that a 64 × 64 sensor array is prepared.
Example 6
In this embodiment, the mass fraction of carbon black in the conductive film is 10 wt.%; the thickness of the force-sensitive film is 0.3 mm; the insulating film is a polyester film and has a thickness of 20 mu m; the number of row conductors and column conductors is 5, respectively, and a 5 × 5 sensor array is prepared.
In the embodiment, the high-conductivity carbon black is uniformly dispersed in the polyurethane to prepare the force-sensitive film with adjustable thickness and excellent pressure-sensitive characteristic; cutting holes on the force-sensitive film by using a laser cutting method, and orthogonally arranging a plurality of leads on two sides of the force-sensitive film in a knitting mode; and then adhering double-sided adhesive tapes and insulating films on two sides of the lead in a laminating manner to finally obtain the wearable flexible sensor array which has high sensitivity (>150KPa-1), low relaxation time (<10mS) and can detect micro pressure (50 mN-1N).
Based on the force-sensitive film and the sensor preparation method and the laminating process of the embodiment, the technical scheme of the invention has the advantages of simple preparation process, low cost, high sensitivity, capability of simultaneously obtaining and recording a large number of touch signals, flexibility and stretchability, and capability of preparing and monitoring and recording the touch signals suitable for multiple parts of a human body by adjusting the types of insulating materials.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (10)
1. A high-sensitivity flexible wearable sensor array is characterized by comprising row leads (1), force-sensitive films (2), column leads (3), double-sided transparent adhesive tapes (4), insulating films (5) and wire arranging holes (6);
the row leads (1) and the column leads (3) are arranged at the upper side and the lower side of the force-sensitive film (2), double-sided transparent adhesive tapes (4) are respectively laid on the upper surface and the lower surface of the row leads (1) and the column leads (3), and insulating films (5) are respectively laid on the double-sided transparent adhesive tapes (4); the line arranging holes (6) are respectively arranged at two sides of the row conducting wire (1) and the column conducting wire (3).
2. The method for preparing the high-sensitivity flexible wearable sensor array according to claim 1 is characterized by comprising the following steps:
preparation of force-sensitive film
1) Preparation of carbon black dispersion: ultrasonically dispersing carbon black and a dispersing agent for 30-60 min by using an ultrasonic dispersing machine to obtain a uniform carbon black dispersion liquid for later use;
2) preparing a polyurethane solution: ultrasonically dispersing polyurethane and a dispersing agent for 30-60 min by using an ultrasonic dispersing machine to obtain a uniform polyurethane solution for later use;
3) preparing a conductive carbon black-polyurethane composite material: ultrasonically dispersing the carbon black dispersion liquid prepared in the step 1) and the polyurethane solution prepared in the step 2) for 10-20 min, adding tin oxide powder, continuously ultrasonically dispersing for 30-60 min, and stirring for 30-40 min by using a vacuum planetary stirrer; performing ultrasonic dispersion for 30-60 min, stirring for 30-40 min, and repeating the steps for 5 times to obtain a uniformly dispersed conductive carbon black-polyurethane composite material;
4) preparing a conductive carbon black-polyurethane force-sensitive film: vacuum drying the conductive carbon black-polyurethane composite material obtained in the step 3) at 80-90 ℃ for 2h, preparing a force-sensitive film by using an automatic film making machine, and curing the prepared film at 105-115 ℃ for 4h to finally obtain the force-sensitive film;
second, lead arrangement
1) Punching a force-sensitive film: etching orthogonal holes on the force-sensitive film by using a laser cutting machine;
2) a plurality of row conductors and a plurality of column conductors are arranged on the upper side and the lower side of the force-sensitive film at equal intervals in a knitting mode to form an orthogonal electrode array, and finally a sandwich structure of a plurality of row conductors, the force-sensitive film and a plurality of column conductors is formed;
sensor array assembly
Respectively sticking a layer of double-sided transparent adhesive tape on two sides of the sandwich structure in the step two, and finally respectively sticking a layer of insulating film on the outer side of the transparent adhesive tape;
fourth, expose the wire encapsulation process
The exposed wire was insulated with PDMS: PDMS was uniformly coated on the exposed surface of the conductive wire, cured at 60 ℃ for 2h, and then left at room temperature for 12 h.
3. The method of claim 1, wherein the dispersant is DY-9006.
4. The method for preparing a high-sensitivity flexible wearable sensor array according to claim 1, wherein the polyurethane is thermoplastic polyurethane, the tensile strength is more than 70MPa, the elongation at break is up to 1000%, and the high temperature resistance is more than 120 ℃.
5. The preparation method of the high-sensitivity flexible wearable sensor array according to claim 1, wherein the mass fraction of the carbon black in the conductive carbon black-polyurethane composite material is 5-10 wt.%.
6. The preparation method of the high-sensitivity flexible wearable sensor array according to claim 1, wherein the tin oxide powder is nano tin oxide powder subjected to surface modification treatment by a 40% sodium hydroxide solution, the average particle size is 30-50 nm, and the specific surface area is 35m2/kg。
7. The method for preparing the high-sensitivity flexible wearable sensor array according to claim 1, wherein the thickness of the force-sensitive film is 0.1-0.3 mm.
8. The method for preparing the high-sensitivity flexible wearable sensor array according to claim 1, wherein the double-sided transparent adhesive tape is 5mm in width and 0.1mm in thickness.
9. The method for preparing the high-sensitivity flexible wearable sensor array according to claim 1, wherein the insulating film is a polyethylene film with a thickness of 15-30 μm.
10. The method for preparing a high-sensitivity flexible wearable sensor array according to claim 1, wherein the ratio of the PDMS monomer to the cross-linking agent is 15: 1.
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