CN115971010A - Method for preparing nano composite material piezoresistive strain sensor - Google Patents
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Abstract
The invention discloses a method for preparing a nano composite material piezoresistive strain sensor, which comprises the steps of mixing a carbon-based nano material and a polymer material through an organic solvent, sequentially carrying out mechanical stirring and ultrasonic dispersion to prepare a nano composite material solution, conveying the nano composite material solution to an automatic spray head by using a pressure barrel for atomization, operating the automatic spray head to move by using a three-axis movement platform to deposit the atomized nano composite material solution on a flexible substrate film to form a nano composite material coating, coating conductive adhesive on two ends of the nano composite material coating to prepare electrodes and lead out a lead, and adhering the flexible substrate film to the part, which is not coated with the conductive adhesive, in the middle of the nano composite material coating. The preparation method disclosed by the invention has the advantages that the used instruments and equipment are low in cost, easy to operate and high in preparation efficiency, and the prepared sensors are highly consistent in performance and suitable for large-scale and batch production.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a method for preparing a nano composite material piezoresistive strain sensor.
Background
Accurate structural strain measurements are the basis for analyzing structural performance and detecting structural damage. Resistive strain gauges based on metal and semiconductor materials have been developed to date for structural strain measurements. However, the larger structure sizes and increasingly complex structure forms present significant challenges to the structural strain measurement methods. Specifically, the conventional resistance strain gauge has high material cost, a complicated preparation process, and brittle and hard physical properties, and when the conventional resistance strain gauge is attached to a structure surface having a complicated profile, the conventional resistance strain gauge is easily detached and has a large measurement error. In addition, the strain measurement range of the conventional resistance strain gauge is extremely limited, and the conventional resistance strain gauge is not suitable for strain measurement of a large deformation structure. The flexible nanocomposite strain sensor has higher sensitivity and larger strain limit, which provides a solution for strain measurement of large deformation structures. The nano composite material is prepared by doping nano fillers in a polymer material for modification, and the polymer serving as a matrix has excellent flexibility, so that the nano composite material strain sensor can be attached to the surface of a structure with a complex profile in a conformal mode. Moreover, the nano composite material strain sensor has lighter weight and lower cost, and can be arranged on the surface of the structure in a large area and high density manner, and even be directly integrated in the composite material structure.
Nanocomposite strain sensors are generally classified into capacitive, piezoelectric, and piezoresistive types according to the mechanism of operation. Compared with capacitance and piezoelectric type, the structural form of the nano composite material piezoresistive strain sensor is simpler, so that the nano composite material piezoresistive strain sensor is easier to manufacture and wider in application. The nano composite material piezoresistive strain sensor is generally prepared by melt blending or solution blending nano filler and polymer material. The melt blending-based method includes a hot press method, a fused deposition modeling technique, and the like, and the solution blending-based method includes a drop coating method, a tape casting method, a spin coating method, an electrospinning technique, an inkjet printing technique, a spray coating method, and the like. In the method, the hot pressing method requires that the nano filler and the polymer are melted and mixed and then placed into a mould and are pressed under high temperature and high pressure, the method has low production efficiency and high cost, has higher requirements on the material of the mould and short service life of the mould, and the prepared sensor film has large thickness generally; the fused deposition modeling technology is that the nanometer filler and the thermoplastic polymer are melted and extruded into filaments, and then the filaments are fused, deposited, solidified and modeled, and the technology is complex, the modeling speed is slow, and the technology is only suitable for thermoplastic polymer materials; the dripping method is that the nano composite material solution prepared by nano filler and polymer is directly dripped on the surface of a substrate and then dried to form a film, and the film has uneven orange peel in the drying process due to the influence of the surface tension of the solution; the tape casting method is that the nano composite material solution is placed in front of a scraper, and a layer of film is formed on a substrate by the movement of the scraper, the thickness of the film is not easy to control, and the uniformity of the thickness is poor; the spin-coating method is to spread the solution to prepare a thin film by using centrifugal force, and the larger the radius is, the larger the centrifugal force is, so that the thickness distribution of the thin film is not uniform; the electrostatic spinning technology is that a high-voltage electric field is utilized to draw a nano composite material solution into fibers and lay the fibers into a film, and the fibers in the film are disordered in arrangement and poor in uniformity; the ink-jet printing technology is to jet ink according to requirements, the thickness of a film is uniform, but the requirement on the material is high, otherwise a spray head is easily blocked by the nano composite material solution. The spray coating method is a coating preparation process for atomizing and spraying out and depositing a nano composite material solution, and is widely applied to a coating preparation scene. In particular to a spraying method by utilizing air atomization, which has the advantages of low equipment cost, simple operation, low requirement on materials, suitability for various nano composite material solutions, excellent performance of the prepared sensor and great prospect in the aspects of batch and scale production of the sensor.
However, at present, the nano composite material piezoresistive strain sensor is still prepared manually by means of spraying, the efficiency of the method is very low, and the thickness and uniformity of the coating cannot be accurately controlled, so that not only is material waste caused, but also the performance of the sensor is greatly different. In addition, nanocomposite solutions often contain large amounts of organic solvents and even toxic dispersion aids that are harmful to the health of the spray worker.
Disclosure of Invention
The invention combines the air atomization spraying process with the three-axis motion platform, provides a deposition forming process for accurately controlling the coating by utilizing the mechanical air atomization spraying process, controls the thickness of the nano composite material coating by setting the spraying times, and determines the shape and the surface area of the nano composite material coating by adopting the molding layer so as to avoid material waste and environmental pollution and ensure that the piezoresistive strain sensor of the nano composite material has consistent performance. The invention provides a preparation method of a piezoresistive strain sensor, which has low cost, easy operation and high efficiency and is suitable for various nano composite materials.
The embodiment of the application discloses a method for preparing a nano composite piezoresistive strain sensor, utilizes a three-axis motion platform to drive an automatic spray head to move, the automatic spray head atomizes and deposits a nano composite solution on a flexible substrate film to form a nano composite coating, the thickness of the nano composite coating is determined through spraying times, the shape and the surface area size are determined through a molding layer, the two ends of the nano composite coating are coated with conductive adhesive to prepare an electrode and lead out a lead, and the part which is not coated with the conductive adhesive in the middle of the nano composite coating is pasted with a flexible substrate film with adhesive and is manufactured.
Preferably, in the method for preparing the nanocomposite piezoresistive strain sensor, the three-axis motion platform comprises an X axis, a Y axis and a Z axis, the X axis and the Y axis are horizontal directions perpendicular to each other, the Z axis is vertical direction, a spraying track of the automatic sprayer is set through the X axis and the Y axis, a spraying height of the automatic sprayer is set through the Z axis, the automatic sprayer is installed on the Z axis through a fixed hook, an interface on the automatic sprayer is provided with a liquid inlet switch interface, a liquid inlet and an air inlet, and a knob on the automatic sprayer is provided with a flow adjusting knob and a spraying amplitude adjusting knob.
Preferably, in the method for preparing the piezoresistive strain sensor made of nano-composite material, a liquid inlet switch interface of the automatic nozzle is connected with an air compressor through a pressure regulating valve, and when the air pressure at the liquid inlet switch interface is greater than a certain value, the nano-composite material solution enters the automatic nozzle through a liquid inlet and is atomized; the liquid inlet of the automatic spray nozzle is connected with a pressure barrel, the pressure barrel is filled with the nano composite material solution and is connected with an air compressor through a pressure regulating valve, and the air compressor pressurizes the pressure barrel to convey the nano composite material solution to the automatic spray nozzle from the liquid inlet; the air inlet of the automatic spray head is connected with an air compressor, and the compressed air entering the automatic spray head from the air inlet atomizes and sprays the nano composite material solution entering the automatic spray head from the liquid inlet; and the flow regulating knob and the spray amplitude regulating knob of the automatic spray head are respectively used for regulating the flow of the nano composite material solution entering the automatic spray head and the spray amplitude of atomization of the nano composite material solution.
Preferably, in the above method of manufacturing a nanocomposite piezoresistive strain sensor, the nanocomposite solution is obtained by dissolving a carbon-based nanomaterial as a nanofiller and a polymer material as a matrix in an organic solvent and sequentially performing mechanical stirring and ultrasonic dispersion treatment.
Preferably, in the above method of producing a nanocomposite piezoresistive strain sensor, the molding layer is placed on a heating table, the molding layer comprises an upper part and a lower part, and the flexible base film is sandwiched between the upper part and the lower part of the molding layer.
Preferably, in the above method for preparing a nanocomposite piezoresistive strain sensor, the molding layer is polylactic acid, the molding layer can be manufactured by using a 3D printer based on fused deposition modeling principle, and the molding layer is used to prepare a nanocomposite coating with a desired shape and surface area.
Preferably, in the above method of manufacturing a nanocomposite piezoresistive strain sensor, the nanocomposite piezoresistive strain sensor is a CB/PVP nanocomposite piezoresistive strain sensor made with Carbon Black (CB) and polyvinylpyrrolidone (PVP) as nanofiller and polymer matrix material, respectively, with the CB being uniformly dispersed in the PVP.
Preferably, in the method for preparing the nanocomposite piezoresistive strain sensor, the CB/PVP nanocomposite piezoresistive strain sensor is prepared by coating epoxy conductive adhesive on two ends of a CB/PVP nanocomposite coating with the thickness of 10 μm to prepare electrodes and leading out a lead, and adhering a polyimide film adhesive tape with the thickness of 10 μm on a part which is not coated with the epoxy conductive adhesive in the middle of the coating.
Preferably, in the above method of manufacturing a piezoresistive strain sensor of a nanocomposite, the difference in thickness of the CB/PVP nanocomposite coating is less than 0.5 μm, the thickness of the CB/PVP nanocomposite coating is linearly dependent on the number of spraying times, and the nanocomposite coating having a specified thickness is manufactured by setting the number of spraying times.
Preferably, in the above method of making a nanocomposite piezoresistive strain sensor, the CB/PVP nanocomposite piezoresistive strain sensor has a sensitivity of 17.54 in the 10% strain range.
Compared with the prior art, the invention discloses a method for preparing a nano composite material piezoresistive strain sensor based on a mechanized air atomization spraying process. The preparation method comprises the steps of mixing a carbon-based nano material serving as a nano filler and a polymer material serving as a matrix through an organic solvent, sequentially carrying out mechanical stirring and ultrasonic dispersion treatment to prepare a nano composite material solution, conveying the nano composite material solution to an automatic spray head by using a pressure barrel for atomization, operating the automatic spray head to move by using a three-axis movement platform to deposit the atomized nano composite material solution on a flexible substrate film to form a nano composite material coating, coating conductive adhesive on two ends of the nano composite material coating to prepare electrodes, leading out a lead, and adhering a flexible substrate film adhesive tape to the part, which is not coated with the conductive adhesive, in the middle of the nano composite material coating, thereby preparing the nano composite material piezoresistive strain sensor.
In the preparation method disclosed by the invention, the thickness of the nano composite coating is controlled by setting the spraying times, and the shape and the surface area size of the nano composite coating are determined by utilizing a polyethylene molding layer made by a 3D printer based on the fused deposition modeling principle. The same batch of nanocomposite coatings prepared based on the proposed method of the present invention have consistent thickness and the nanofillers are uniformly dispersed in the polymer matrix in each nanocomposite coating.
The invention also discloses a CB/PVP nano composite material piezoresistive strain sensor prepared based on the mechanized air atomization spraying process, the sensor adopts Carbon Black (CB) as a nano filler, adopts polyvinylpyrrolidone (PVP) as a polymer matrix, and a uniaxial tensile test proves that the mass ratio of the prepared CB to the PVP is 2: the CB/PVP nanocomposite piezoresistive strain sensor of 8 has a sensitivity of 17.54 within the strain limit of 10%.
Compared with the prior art, the preparation method disclosed by the invention has the advantages that the used instruments and equipment are low in cost, easy to operate and high in preparation efficiency, and the prepared sensors are highly consistent in performance and are suitable for large-scale and batch production. Compared with the traditional resistance strain gauge, the CB/PVP nano composite material piezoresistive strain sensor disclosed by the invention has high sensitivity and large strain limit.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart illustrating the preparation of a piezoresistive strain sensor made of a nanocomposite material according to an embodiment of the present invention;
FIG. 2 is a schematic view of a mechanized air atomizing spray application in accordance with an embodiment of the present invention;
FIG. 3 is a view showing the structure of an automatic spray head according to an embodiment of the present invention;
FIG. 4 is a diagram showing the composition of a molding layer in an embodiment of the present invention;
FIG. 5 is a schematic diagram of an atomized deposition of a nanocomposite solution according to an embodiment of the present invention;
FIG. 6 is a diagram of a nanocomposite coating in an example of the invention;
FIG. 7 is a diagram of a nanocomposite piezoresistive strain sensor according to an embodiment of the invention;
FIG. 8 is a graph showing the thickness of a CB/PVP nanocomposite coating as a function of spray application times for an embodiment of the invention;
FIG. 9 is a micro-topography of a CB/PVP nanocomposite coating at a 2um scale in an example of the invention;
FIG. 10 is a micrograph of a CB/PVP nanocomposite coating at 200nm in accordance with an embodiment of the invention;
FIG. 11 is a graph showing the resistance versus strain curve for a CB/PVP nanocomposite piezoresistive strain sensor in an embodiment of the invention.
The device comprises 1-carbon-based nano material, 2-polymer material, 3-organic solvent, 4-stirrer, 5-ultrasonic cleaner, 6-nano composite material solution, 7-mechanized air atomization spraying system, 8-nano composite material coating, 9-nano composite material piezoresistive strain sensor, 10-X axis of three-axis motion platform, 11-Y axis of three-axis motion platform, 12-Z axis of three-axis motion platform, 13-automatic spray head, 14-flexible substrate film, 15-heating table, 16-molding layer, 17-fixed hook, 18-liquid inlet switch interface, 19-liquid inlet, 20-air inlet, 21-flow adjusting knob, 22-spray amplitude adjusting knob, 23-upper part of molding layer, 24-lower part of molding layer, 25-electrode, 26-lead and 27-flexible substrate film adhesive tape.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail 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 embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The preparation process of the nano composite material piezoresistive strain sensor comprises the following steps:
as shown in fig. 1, a carbon-based nanomaterial 1 as a nanofiller and a polymer material 2 as a matrix are dissolved in an organic solvent 3, and mechanical stirring and ultrasonic dispersion treatment are sequentially performed by using a stirrer 4 and an ultrasonic cleaner 5, thereby preparing a uniform nanocomposite solution 6; atomizing and depositing the nano composite material solution 6 on the flexible substrate film by using a mechanized air atomization spraying system 7 to form a nano composite material coating 8; and coating the conductive adhesive on two ends of the nano composite material coating to form electrodes and leading out a lead, and adhering the flexible substrate film with the adhesive on the part, which is not coated with the conductive adhesive, of the nano composite material coating to finally prepare the nano composite material piezoresistive strain sensor 9.
The mechanized air atomization spraying process comprises the following steps:
as shown in fig. 2, the three-axis motion stage comprises an X-axis 10, a Y-axis 11 and a Z-axis 12, an automatic spray head 13 is mounted on the Z-axis 12, the automatic spray head 13 atomizes and deposits the nanocomposite solution 6 on a flexible substrate film 14, and the flexible substrate film 14 is clamped in a molding layer 16 on a heating table 15.
The three-axis motion platform drives the automatic spray head 13 to move, the spraying track of the automatic spray head 13 is set through the X axis 10 and the Y axis 11, and the spraying height of the automatic spray head 13 is set through the Z axis 12.
The automatic nozzle 13 is provided with a fixed hook 17, a liquid inlet switch interface 18, a liquid inlet 19, an air inlet 20, a flow rate adjusting knob 21 and a spray amplitude adjusting knob 22, as shown in fig. 3. The automatic spray head 13 can be mounted on the Z-axis 12 of the three-axis motion platform by means of a fixed hook 17. The liquid inlet switch interface 18 is connected with an air compressor through a pressure regulating valve, and when the air pressure at the liquid inlet switch interface 18 is larger than a certain value, the nano composite material solution can enter the automatic nozzle 13 through the liquid inlet 19 and is atomized; the liquid inlet 19 is connected with a pressure barrel, the pressure barrel is filled with the nano composite material solution, the pressure barrel is connected with an air compressor through a pressure regulating valve, and the nano composite material solution can be conveyed to the automatic spray head 13 from the liquid inlet 19 by utilizing the air compressor to pressurize the pressure barrel; the air inlet 20 is connected with an air compressor, and the compressed air entering the automatic spray head 13 from the air inlet 20 can atomize and spray the nano composite material solution entering the automatic spray head 13 from the liquid inlet 19; the flow rate of the nanocomposite solution entering the automatic nozzle and the spray width of the nanocomposite solution atomization can be adjusted by the flow rate adjusting knob 21 and the spray width adjusting knob 22.
The function of the molding layer 16 is to determine the shape and surface area size of the nanocomposite coating formed by spraying, as shown in fig. 4 and 5, which comprises an upper portion 23 and a lower portion 24, with the flexible base film 14 sandwiched between the upper portion 23 and the lower portion 24; the material of the molding layer 16 is polylactic acid, and the molding layer 16 can be custom designed and manufactured by using a 3D printer based on fused deposition modeling principle, so that nanocomposite coatings of various shapes and surface area sizes can be conveniently prepared.
The heating stage 12 may rapidly volatilize the organic solvent from the atomized nanocomposite solution, but in order to prevent deformation or even melting of the molding layer 16, the temperature of the heating stage 12 should be less than 60 c,
in addition, the thickness of the nanocomposite coating can be controlled by setting the number of spraying times.
Nanocomposite coatings and nanocomposite piezoresistive strain sensors:
fig. 6 shows the nanocomposite coating, wherein conductive adhesive is coated on two ends of the nanocomposite coating to prepare electrodes 25, a lead 26 is led out, and a layer of flexible substrate film adhesive tape 27 with adhesive is attached to the part, which is not coated with the conductive adhesive, to realize the packaging protection of the nanocomposite coating, so as to obtain the nanocomposite piezoresistive strain sensor shown in fig. 7.
Preparing a CB/PVP nano composite material piezoresistive strain sensor based on a mechanized air atomization spraying process:
selecting Carbon Black (CB), polyvinylpyrrolidone (PVP) and absolute ethyl alcohol as a nano filler, a polymer matrix and an organic solvent respectively, dissolving 2g of a mixture of the CB and the PVP (the mass ratio of the CB to the PVP is 2. And (3) filling the nano composite material solution into a pressure barrel, wherein the air pressure in the pressure barrel is 2bar, the air pressures at the interface of a liquid inlet switch and an air inlet of the automatic spray nozzle are respectively 2bar and 1bar, and the height of the automatic spray nozzle is 15cm. The CB/PVP nano composite material solution is atomized by an automatic nozzle and then deposited on a polyimide film with the thickness of 25 mu m, and CB/PVP nano composite material coatings with different thicknesses are prepared by setting the spraying times.
The thickness of the CB/PVP nanocomposite coating was measured using an MDH-25MB micrometer caliper, and the results are shown in FIG. 8. It can be seen that the thickness difference of the CB/PVP nano composite material coating is within 0.5 mu m, and the thickness of the CB/PVP nano composite material coating has a linear relation with the spraying times, so that the nano composite material coating with the specified thickness can be accurately prepared by setting the spraying times.
The microscopic morphology of the CB/PVP nanocomposite coating with a thickness of 10 μm was observed at different scales using the SUPRA 55 saphire scanning electron microscope, and the results are shown in fig. 9 and 10. It can be seen that CB is uniformly dispersed in PVP.
And (3) coating epoxy conductive adhesive on two ends of the CB/PVP nano composite material coating, leading out a lead, and adhering a polyimide film adhesive tape with the thickness of 10 mu m to the part, which is not coated with the epoxy conductive adhesive, in the middle of the CB/PVP nano composite material coating to obtain the CB/PVP nano composite material piezoresistive strain sensor. And testing the strain sensing performance of the CB/PVP nano composite material piezoresistive strain sensor through a uniaxial tensile test. Firstly, sticking a CB/PVP nano composite material piezoresistive strain sensor on a polyethylene tensile test piece, clamping the tensile test piece on a universal testing machine, measuring the resistance of the CB/PVP nano composite material sensor by using a DMM6500 digital multimeter, measuring the elongation of the polyethylene tensile test piece by using a stretching meter and calculating the strain to finally obtain the relative change of the resistance of the CB/PVP nano composite material piezoresistive strain sensor (the relative change of the resistance of the CB/PVP nano composite material piezoresistive strain sensor is the
) The dependence on strain (. Epsilon.) is shown in FIG. 11. It can be seen that the sensitivity of the CB/PVP nanocomposite piezoresistive strain sensor is 17.54 over a 10% strain range.
The present embodiments are to be considered as illustrative and not restrictive, and modifications may be made in the details within the scope and range of equivalents of the present patent without departing from the spirit and scope of the patent.
Claims (10)
1. A method for preparing a nano composite material piezoresistive strain sensor is characterized in that a triaxial movement platform is used for driving an automatic spray head to move, the automatic spray head atomizes and deposits a nano composite material solution on a flexible substrate film to form a nano composite material coating, the thickness of the nano composite material coating is determined by spraying times, the shape and the surface area are determined by a molding layer, conductive adhesive is coated on two ends of the nano composite material coating to prepare electrodes and lead out wires, and the flexible substrate film with adhesive is adhered to the part, which is not coated with the conductive adhesive, of the nano composite material coating.
2. The method according to claim 1, wherein the three-axis motion stage comprises an X-axis, a Y-axis and a Z-axis, the X-axis and the Y-axis are horizontal directions perpendicular to each other, the Z-axis is vertical direction, a spraying trajectory of the automatic nozzle is set by the X-axis and the Y-axis, a spraying height of the automatic nozzle is set by the Z-axis, the automatic nozzle is installed on the Z-axis by a fixed hook, an interface of the automatic nozzle comprises a liquid inlet switch interface, a liquid inlet and a gas inlet, and a knob of the automatic nozzle comprises a flow rate adjusting knob and a spraying amplitude adjusting knob.
3. The method for preparing the piezoresistive strain sensor made of nano-composite materials according to claim 2, wherein a liquid inlet switch interface of the automatic sprayer is connected with an air compressor through a pressure regulating valve, and when the air pressure at the liquid inlet switch interface is greater than a certain value, nano-composite material solution enters the automatic sprayer through a liquid inlet and is atomized; the liquid inlet of the automatic spray head is connected with a pressure barrel, the pressure barrel is filled with the nano composite material solution and is connected with an air compressor through a pressure regulating valve, and the air compressor pressurizes the pressure barrel to convey the nano composite material solution to the automatic spray head from the liquid inlet; the air inlet of the automatic spray head is connected with an air compressor, and the compressed air entering the automatic spray head from the air inlet atomizes and sprays the nano composite material solution entering the automatic spray head from the liquid inlet; and the flow regulating knob and the spray amplitude regulating knob of the automatic spray head are respectively used for regulating the flow of the nano composite material solution entering the automatic spray head and the spray amplitude of the atomized nano composite material solution.
4. The method of preparing a nanocomposite piezoresistive strain sensor according to claim 1, wherein the nanocomposite solution is obtained by dissolving a carbon-based nanomaterial as a nanofiller and a polymer material as a matrix in an organic solvent and sequentially performing mechanical stirring and ultrasonic dispersion treatment.
5. The method of claim 1, wherein the molding layer is placed on a heated platen, the molding layer comprises an upper portion and a lower portion, and the flexible substrate film is sandwiched between the upper portion and the lower portion of the molding layer.
6. The method of claim 1, wherein the molding layer is polylactic acid, the molding layer can be manufactured by a 3D printer based on fused deposition modeling, and the molding layer is used to form the nanocomposite coating with desired shape and surface area.
7. The method of making a nanocomposite piezoresistive strain sensor according to claim 1, wherein the nanocomposite piezoresistive strain sensor is a CB/PVP nanocomposite piezoresistive strain sensor made with Carbon Black (CB) and polyvinylpyrrolidone (PVP) as nanofiller and polymer matrix material, respectively, the CB being uniformly dispersed in the PVP.
8. The method of claim 7, wherein the CB/PVP nanocomposite piezoresistive strain sensor is manufactured by coating epoxy conductive adhesive on both ends of a CB/PVP nanocomposite coating having a thickness of 10 μm to prepare electrodes and leading out wires, and attaching a polyimide film adhesive tape having a thickness of 10 μm to a portion of the coating not coated with the epoxy conductive adhesive.
9. The method of fabricating a piezoresistive strain sensor according to claim 8, wherein the difference in the thickness of the CB/PVP nanocomposite coating is less than 0.5 μm, the thickness of the CB/PVP nanocomposite coating is linear with the number of spraying times, and the nanocomposite coating with a given thickness is fabricated by setting the number of spraying times.
10. The method of making a nanocomposite piezoresistive strain sensor according to claim 8, wherein the CB/PVP nanocomposite piezoresistive strain sensor has a sensitivity of 17.54 in the 10% strain range.
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