CN110823421A - Method for preparing flexible piezoresistive shear force sensor by utilizing 3D printing - Google Patents
Method for preparing flexible piezoresistive shear force sensor by utilizing 3D printing Download PDFInfo
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- CN110823421A CN110823421A CN201911127655.4A CN201911127655A CN110823421A CN 110823421 A CN110823421 A CN 110823421A CN 201911127655 A CN201911127655 A CN 201911127655A CN 110823421 A CN110823421 A CN 110823421A
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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
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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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
Abstract
The invention discloses a method for preparing a flexible piezoresistive shear force sensor by utilizing 3D printing, which comprises the following steps: s1, dispersing the conductive nano filler in an organic solvent by ultrasonic waves to obtain a dispersion liquid; s2, adding the thermoplastic polymer A into the dispersion liquid, heating, and stirring to completely dissolve the thermoplastic polymer A in the solvent to obtain a suspension; s3, drying the suspension to remove the solvent to obtain a conductive composite material, shearing the conductive composite material, mixing the conductive composite material with another thermoplastic polymer B, and performing melt extrusion by using an extruder to obtain a wire material with an isolated double-percolation structure; s4, printing the wire into a sensor with a specific structure by using a 3D printer, and fixing the lead on the sensor through conductive silver paste to obtain the flexible piezoresistive shear force sensor. The sensor has the advantages of light weight, small size, high flexibility, high sensitivity, quick response, stable performance, good fatigue resistance and the like, is low in cost by using a 3D printing mode, and is suitable for large-scale batch production.
Description
Technical Field
The invention belongs to the technical field of flexible sensors, and particularly relates to a method for preparing a flexible piezoresistive shear force sensor by using a 3D printing technology.
Background
The shear force sensor is an important branch of a wide variety of sensors, and the function of the shear force sensor is to quantitatively convert shear force caused by the shear force into signals such as electric signals and the like, record the signals and feed the signals back to human beings. Due to the limitation of the development of material science and electronic science, the shear force sensors which are common nowadays comprise fiber bragg grating sensors, spoke type shear force sensors and dot matrix type shear force sensors, most of the sensors are made of metal materials and semiconductor materials, and have some defects, such as complex preparation process, high cost and unsuitability for batch production; the structure is complex and heavy, and is not suitable for being attached to a human body; complex force such as torsional force, tangential force and the like can not be effectively detected; the sensitivity, stability and other properties of the sensor cannot meet the increasing demands of people.
With the development of new materials, the nanometer conductive composite material attracts the attention of researchers in China and abroad, and the application of the nanometer conductive composite material in the field of force sensors is rapidly developed in recent years. The nano-conductive composite is generally composed of two parts, a polymer elastomer and a conductive nano-filler. The polymer elastomer serves as a matrix of the conductive nanocomposite, and the polymer matrix can generate corresponding deformation along with external force when external force is applied. The conductive nano filler plays a role in constructing a conductive network in the composite material, and when the sensor deforms, the conductive network can be reconstructed or destroyed along with the deformation of the polymer matrix, so that the change of the total resistance value can objectively reflect the stress of the conductive composite material. Carbon nanomaterials have the advantages of high strength and mechanical properties, excellent electrical conductivity, nano-scale microstructure and the like, so that the carbon nanomaterials are widely used as conductive fillers of conductive nanocomposites, and the applications of carbon nanotubes, graphene nanoplatelets, carbon black and carbon fibers in the conductive nanocomposites are widely researched up to now. The nano conductive composite material has the advantages of light weight, flexibility and good processability, and particularly has the advantage of easy processing, so that the nano conductive composite material is widely applied to the preparation of the flexible piezoresistive shear force sensor. The property of the conductive nano-filler has great influence on the sensing performance of the conductive nano-composite material, and the nano-filler is easy to agglomerate in a matrix due to the extremely high surface energy of the nano-filler so as to reduce the utilization efficiency of the filler, so that the reduction of the agglomeration degree of the nano-filler has important significance for improving the performance of the composite material.
However, most of the manufacturing methods of the flexible force sensor generally have some problems, for example, the manufacturing process is complicated and long in period, and the manufacturing method is not easy to be put into production in a large scale in batch; only some strain sensors with simple structures can be prepared, and the preparation of flexible sensors with certain customized structures has challenges; the preparation process is not environment-friendly, and the process of preparing the flexible force sensor is often accompanied with the generation of byproducts which are harmful to the environment. Particularly, a sensor with a customized structure is required to detect the stress in some special environments or special stresses, but the sensor with a certain specific structure prepared by a conventional method has the difficulties of difficult molding, low molding precision, high mold opening cost and the like. To address these ubiquitous challenges, methods of making flexible force sensors using 3D printing technology have been proposed. The 3D printing manufacturing process has the advantages of rapidness, simplicity, high forming precision, no byproduct generation and capability of manufacturing various structural products. 3D printing technology is also applied to the manufacturing process of the flexible force sensor, so that the flexible force sensor with a customized structure is manufactured for reality.
Disclosure of Invention
The invention aims to provide a method for preparing a flexible piezoresistive shear force sensor by utilizing a 3D printing technology.
The invention provides a method for preparing a flexible piezoresistive shear force sensor by utilizing 3D printing, which comprises the following steps:
and S1, adding the conductive nano filler into an organic solvent, and performing ultrasonic dispersion treatment for at least 1 hour to completely disperse the conductive nano filler in the solvent to obtain a dispersion liquid. The conductive nano filler is one or at least two of carbon nano tubes, graphene nano sheets, carbon black particles and silver nano wires. The organic solvent is one of Dimethylacetamide (DMAC), N-Dimethylformamide (DMF), dimethyl sulfoxide (DMSO), Diethoxymethane (DEM) and Tetrahydrofuran (THF).
S2, adding the thermoplastic polymer A into the dispersion, heating in an oil bath at 80 ℃ for 2-5h, and stirring to completely dissolve the thermoplastic polymer A into the organic solvent to obtain a suspension.
S3, drying the suspension in a blast oven at 80 ℃ for 24h, completely removing the organic solvent to obtain a blocky conductive composite material, shearing the conductive composite material, mixing the conductive composite material with another thermoplastic polymer B, and melting and extruding the mixture into a wire material at 180 ℃ by using a single-screw extruder. Wherein, the thermoplastic polymer A and the thermoplastic polymer B are both selected from one of styrene thermoplastic elastomer, polyolefin thermoplastic elastomer, polyurethane thermoplastic elastomer, polyester thermoplastic elastomer, polyamide thermoplastic elastomer, ethylene copolymer thermoplastic elastomer, 1,2 polybutadiene thermoplastic elastomer, trans-polyisoprene thermoplastic elastomer, thermoplastic natural rubber, chlorinated polyethylene thermoplastic elastomer, polysiloxane thermoplastic elastomer, thermoplastic fluorine-containing elastomer and ionic thermoplastic elastomer. During the process of extruding the dried blocky conductive composite material into wires, the material is cut to be as fine as possible, so that the extrusion process is easier to plasticize and mold.
S4, printing the silk material into a sensor with a specific structure by using an FDM3D printer, wherein the 3D printing temperature is 225 ℃, inserting a light hard rod on the sensor to amplify the shearing force, fixing a lead on the sensor through conductive silver adhesive, and curing the conductive silver adhesive at the temperature of 60 ℃ for 2 hours to obtain the flexible piezoresistive shearing force sensor. The strain of the sensor is caused by deflection of the hard thin rod by means of shearing force, and the stress of the cross-shaped structure of the sensor is amplified by lever effect to generate deformation.
Preferably, in step S1, two conductive nanofillers, filler a and filler B, are used, and the two fillers are simultaneously dispersed in an organic solvent to prepare a dispersion. Further preferably, the conductive nanofillers a and B are carbon nanotubes and graphene nanoplatelets with different dimensions, or carbon nanotubes and carbon black particles with different dimensions, respectively.
Compared with the prior art, the invention has the advantages that:
(1) according to the invention, two carbon nano fillers with different dimensions are adopted, and the synergistic effect between the two carbon nano fillers improves the dispersion degree of the fillers in the matrix, thereby avoiding the problems that the carbon nano fillers are easy to agglomerate and difficult to disperse in the matrix. Meanwhile, the conductive network is optimized by utilizing the synergistic effect among different fillers, the utilization efficiency of the nano fillers is improved, and the structure of the conductive network is improved. In addition, the composite material mixed with the conductive nano-filler is mixed with another polymer matrix to form a double-percolation structure by utilizing different interface properties between the conductive nano-filler and different polymer matrixes. The synergistic effect between the conductive fillers with different dimensions and the double-percolation structure have remarkable promotion effects on the sensing performances of the shear force sensor, such as sensitivity, stability and the like.
(2) The customized flexible shear force sensor of the present invention is easily molded using fused deposition 3D printing techniques. Compare in traditional forming technology, 3D printing technology makes the flexible shear force sensor size structure precision of this customization structure can reach the requirement to can guarantee to produce fast, low cost in putting into large-scale production process, every flexible shear force sensor printing time does not exceed 2 minutes, and the combined material raw materials quantity does not exceed 0.17 gram, and the product of different batch productions can guarantee that structural performance is unanimous moreover. The composite material has good conductivity and meets the use requirement by using a small amount of the conductive nano filler. And the polymer matrix material has wide source and low price, so that the production and the application of the invention have feasibility. Producing a sensor of the present invention requires less than 0.16g of polymer and less than 5mg of carbon nanofiller, which has the advantage of low cost. The sensor of the present invention has a mass of 0.16g, which is only half the mass of a 10cm x 10cm piece of weighing paper.
(3) The invention designs a specially customized shearing force detection flexible sensor structure, which can amplify and convert micro stress detected out of a plane into the internal stress of the flexible shearing force sensor through the lever action, and convert strain into the change of an electric signal and output the change through the specific force sensing mechanism of the nano conductive composite material.
(4) The conductive nano composite material based on the polymer elastomer has the advantages of light weight, flexibility, easiness in processing and the like, and the environment-friendly material can not cause adverse reaction to a human body when being contacted with skin. Compared with a shearing force sensor prepared from a traditional metal material or a semiconductor material, the prepared flexible sensor is more easily attached to a human body and carried about at any time.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 and a process flow chart of a flexible piezoresistive shear force sensor prepared by a 3D printing technology.
Fig. 2 is a schematic diagram of a conductive network of an isolated double percolation structure.
FIG. 3 is a schematic diagram of an electrode assembly of a flexible piezoresistive shear force sensor.
Fig. 4 is a schematic size diagram of a flexible piezoresistive shear force sensor.
Fig. 5 is a schematic view of the weight of the flexible piezoresistive shear force sensor.
FIG. 6 is a schematic diagram of a sensing principle of the flexible piezoresistive shear force sensor.
FIG. 7 shows the relative current change of a flexible piezoresistive shear force sensor under a small shear force.
FIG. 8 shows a sensing stability test of the flexible piezoresistive shear force sensor with an angular deflection of 5 °.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1, a process flow diagram of the present invention for manufacturing a flexible piezoresistive shear force sensor by using 3D printing technology is presented. FIG. 2 is a schematic diagram of a conductive network of isolated double percolation structure formed in a method of making a sensor according to the present invention.
In the preparation method, the proportion of the filler and the polymer is the proportion of the percolation threshold of the conductivity of the composite material, and the percolation threshold refers to the value of the conductivity of the composite material which is subjected to sudden change along with the addition of the conductive filler, so that the conductive filler can be understood as the proportion of the conductivity of the composite material which is just formed by the conductive network in the process of adding less conductive filler and more conductive filler, and the conductive network is subjected to larger change when the composite material of the proportion is subjected to strain, so that the resistance of the material is subjected to larger strain signal response.
Example 1
The flexible piezoresistive shear force sensor is prepared by taking a composite material of a multiwalled carbon nanotube/graphene nanosheet and TPU/SBS as a raw material. In the system, the sensor has better sensing performance when the mass fraction of the filler is within the range of 2-5 wt%, preferably the mass fraction of the conductive filler is 3 wt%, and the specific steps are as follows:
and S1, adding 0.45g of two nano-filler multi-walled carbon nanotubes and 0.15g of graphene nano-sheets into 200mL of DMF (dimethyl formamide) organic solvent, and performing ultrasonic dispersion treatment for 1 hour with the ultrasonic oscillation power of 100W to completely disperse the nano-fillers in the solvent to obtain a dispersion liquid.
Step S2, adding 10g of Thermoplastic Polyurethane (TPU) into the dispersion liquid obtained in the step S1, heating the mixture in an oil bath kettle at the temperature of 80 ℃ for 2 hours, stirring the mixture to completely dissolve the thermoplastic polyurethane in the organic solvent, wherein the stirring speed is 450 revolutions per minute; a suspension was obtained.
And S3, putting the suspension into a blast oven, drying for 24 hours at the temperature of 80 ℃, completely removing the organic solvent to obtain a blocky conductive composite material, shearing the conductive composite material, mixing the conductive composite material with 10g of styrene-butadiene-styrene block copolymer (SBS), and melting and extruding the mixture into wires at the temperature of 180 ℃ by using a single-screw extruder.
And S4, printing the silk material into a sensor with a customized structure by using an FDM3D printer, inserting a light hard rod on the sensor to amplify the shearing force, and finally fixing the lead on the sensor through conductive silver adhesive, wherein the conductive silver adhesive is cured for 2 hours at the temperature of 60 ℃ to obtain the flexible shearing force sensor. A schematic diagram of a flexible shear force sensor electrode assembly is shown in fig. 3. The size and weight of the flexible shear force sensor are shown in fig. 4 and 5. As shown in fig. 6, when the stressed thin rod of the shear force sensor is subjected to shear forces in different directions, due to the leverage of the structure formed by the thin rod and the shear force sensor, the deflection process of the flexible shear force sensor causes the cross structure at the lower part of the shear force sensor to be greatly deformed at the position in the opposite direction (opposite to the direction of the shear force) of the deflection direction, so that the conductive network inside the sensor matrix is also damaged along with the deformation of the matrix, and thus the corresponding output current signal is also reduced. In addition, the shearing force with different sizes can cause deformation with different sizes on the sensor structure, so that the change rate of the current signal output by the sensor can reflect the damage degree of the conductive network in the sensor, and the shearing force applied to the sensor can be indirectly reflected.
In step S4, the 3D printing process parameters are shown in table 1.
Table 1, 3D printing process parameter table in example 1
| Parameter(s) | Numerical value |
| Layer thickness (mm) | 0.2 |
| Wall thickness (mm) | 0.4 |
| Bottom/top thickness (mm) | 0.4 |
| Filling ratio (%) | 20 |
| Printing speed (mm/s) | 10 |
| Temperature of Hot bed (. degree. C.) | 70 |
| Diameter of nozzle | 0.4 |
| Printing temperature (. degree.C.) | 225 |
| Wire diameter (mm) | 1.75 |
| Flow (%) | 125 |
The top of the thin rod of the flexible shear force sensor prepared in example 1 is repeatedly stirred by using a writing brush, the change condition of the sensor relative to current under a small shear force is shown in fig. 7, when the thin rod of the sensor deflects along the direction of the shear force due to a slight shear force, the cross structure of the sensor deforms along the direction of the shear force, the conductive network structure in the sensor is damaged due to the deformation of the elastic composite material, the output current is reduced, when the shear force does not act on the thin rod, the shear force sensor recovers, the conductive network in the sensor recovers to the initial state, and the output current signal is increased again as shown in fig. 7. Fig. 8 is a sensing stability test chart of the flexible shear force sensor of embodiment 1 with an angle of 5 ° deflection, and a process of repeatedly loading 1500 times to a stressed thin rod of the shear force sensor with an angle of 5 ° deflection and an initial state recovery is given, the current output process of the shear force sensor shown in fig. 8 remains substantially stable, and a current output signal in an early stage of cyclic loading is substantially consistent with a current output signal in a later stage of cyclic loading, which shows that the shear force sensor has the capability of being repeatedly used for a long time.
Example 2
The flexible piezoresistive shear force sensor is prepared by taking a composite material of carbon nano tubes/carbon black particles and SBS/PVDF as a raw material. The sensor has better sensing performance in the system with the filler mass fraction ranging from 3 to 8 wt%. The conductive filler is preferably 5 wt%, and the specific steps are as follows:
and S1, adding 0.8g of two conductive nano-filler multi-walled carbon nanotubes and 0.2g of carbon black particles into 400mL of DMF (dimethyl formamide) organic solvent, and performing ultrasonic dispersion treatment for 1 hour with the ultrasonic oscillation power of 100W to completely disperse the nano-fillers in the solvent to obtain a dispersion liquid.
And step S2, adding 15g of SBS into the dispersion, heating in an oil bath kettle at 80 ℃ for 5 hours, stirring to completely dissolve SBS in the organic solvent, wherein the stirring speed is 450 r/min, and obtaining suspension.
And S3, putting the suspension into a blast oven, drying for 24 hours at the temperature of 80 ℃, completely drying and removing the organic solvent to obtain a conductive composite material, shearing the conductive composite material, mixing the conductive composite material with 5g of polyvinylidene fluoride (PVDF), and melting and extruding the mixture into wires at the temperature of 180 ℃ by using a single-screw extruder.
And S4, printing the silk material into a sensor with a customized structure by using an FDM3D printer, inserting a light hard rod on the sensor to amplify the shearing force, and finally fixing the lead on the sensor through conductive silver adhesive, wherein the conductive silver adhesive is cured for 2 hours at the temperature of 60 ℃ to obtain the flexible shearing force sensor.
In step S4, the 3D printing process parameters are shown in table 2.
Table 2, 3D printing process parameter table in example 2
| Parameter(s) | Numerical value |
| Layer thickness (mm) | 0.2 |
| Wall thickness (mm) | 0.4 |
| Bottom/top thickness (mm) | 0.4 |
| Filling ratio (%) | 20 |
| Printing speed (mm/s) | 10 |
| Temperature of Hot bed (. degree. C.) | 70 |
| Diameter of nozzle | 0.4 |
| Printing temperature (. degree.C.) | 200 |
| Wire diameter (mm) | 1.75 |
| Flow (%) | 100 |
Example 3
The flexible piezoresistive shear force sensor is prepared by taking a composite material of silver nanowires/silver nanoparticles and Linear Low Density Polyethylene (LLDPE)/PVDF as a raw material. The sensor has better sensing performance in the system with the filler mass fraction ranging from 3 to 8 wt%. The conductive filler is preferably 5 wt%, and the specific steps are as follows:
step S1, adding 0.8g of silver nanowires and 0.2g of silver nanoparticles which are different in conductive nano-filler into 400mL of Dimethylacetamide (DMAC) which is an organic solvent, and carrying out ultrasonic treatment on the nano-filler suspension for 1 hour with the ultrasonic oscillation power of 100W to completely disperse the nano-filler suspension in the solvent to obtain a dispersion liquid.
And step S2, adding 10g of PVDF into the dispersion, heating the dispersion in an oil bath kettle at the temperature of 80 ℃ for 2 hours, stirring the dispersion to completely dissolve the PVDF, and obtaining a suspension at the stirring speed of 450 revolutions per minute.
And step S3, putting the suspension into a blast oven, drying for 24 hours at the temperature of 80 ℃, completely drying the organic solvent to obtain the conductive composite material, shearing the conductive composite material, mixing the conductive composite material with 10g of linear low-density polyethylene, and melting and extruding the mixture into wires at the temperature of 135 ℃ by using a single-screw extruder.
And S4, printing the silk material into a sensor with a customized structure by using an FDM3D printer, inserting a light hard rod on the sensor to amplify the shearing force, and finally fixing the lead on the sensor through conductive silver adhesive, wherein the conductive silver adhesive is cured for 2 hours at the temperature of 60 ℃ to obtain the flexible shearing force sensor.
In step S4, the 3D printing process parameters are shown in table 3.
TABLE 3D printing process parameter Table
| Parameter(s) | Numerical value |
| Layer thickness (mm) | 0.2 |
| Wall thickness (mm) | 0.4 |
| Bottom/top thickness (mm) | 0.4 |
| Filling ratio (%) | 50 |
| Printing speed (mm/s) | 10 |
| Temperature of Hot bed (. degree. C.) | 40 |
| Diameter of nozzle | 0.4 |
| Printing temperature (. degree.C.) | 160 |
| Wire diameter (mm) | 1.75 |
| Flow (%) | 100 |
In summary, the invention provides a method for preparing a flexible piezoresistive shear force sensor by using 3D printing, which comprises the steps of preparing a conductive composite material of two conductive nanofillers and a thermoplastic polymer matrix by a solution method; then mixing the composite material with another thermoplastic polymer and extruding the mixture into a wire material; and finally, printing the composite material wire into a flexible piezoresistive shear force sensor with a customized structure by a fused deposition modeling 3D printer. Compared with a traditional non-flexible shear force sensor, the flexible piezoresistive shear force sensor prepared by taking the thermoplastic polymer and the nano conductive filler as raw materials has the advantages of being small in weight, high in flexibility, high in sensitivity, fast in response, stable in performance, good in fatigue resistance and the like, and the mode of preparing the flexible piezoresistive shear force sensor by using a 3D printing technology has low cost and is more suitable for large-scale batch production. The invention has the potential to replace the traditional sensor for detecting the shearing force.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for preparing a flexible piezoresistive shear force sensor by utilizing 3D printing is characterized by comprising the following steps:
s1, ultrasonically dispersing the conductive nano filler in an organic solvent to obtain a dispersion liquid;
s2, adding the thermoplastic polymer A into the dispersion liquid, heating, and stirring to completely dissolve the thermoplastic polymer A in the organic solvent to obtain a suspension;
s3, drying the suspension to remove the solvent to obtain a blocky conductive composite material, shearing the conductive composite material, mixing the conductive composite material with another thermoplastic polymer B, and performing melt extrusion by using an extruder to obtain a wire material;
s4, printing the silk material into a sensor with a specific structure by using an FDM3D printer, and fixing a lead on the sensor through conductive silver paste to obtain the flexible piezoresistive shear force sensor.
2. The method for preparing a flexible piezoresistive shear force sensor by 3D printing according to claim 1, wherein the conductive nanofiller is one or at least two of carbon nanotubes, graphene nanoplatelets, carbon black particles, silver nanowires.
3. The method for manufacturing a flexible piezoresistive shear force sensor according to claim 2, wherein in step S1, two conductive nanofillers, filler a and filler B, are used simultaneously, and the two fillers are dispersed in an organic solvent to form a dispersion.
4. The method for preparing a flexible piezoresistive shear force sensor by 3D printing according to claim 3, wherein the conductive nanofillers A and B are carbon nanotubes and graphene nanoplatelets with different dimensions, or carbon nanotubes and carbon black particles with different dimensions, respectively.
5. The method of fabricating a flexible piezoresistive shear force sensor according to claim 1, wherein the organic solvent is one of dimethylacetamide, N-dimethylformamide, dimethylsulfoxide, diethoxymethane, tetrahydrofuran.
6. The method for preparing a flexible piezoresistive shear force sensor according to claim 1, wherein the thermoplastic polymers a and B are both selected from one of styrene thermoplastic elastomers, polyolefin thermoplastic elastomers, polyurethane thermoplastic elastomers, polyester thermoplastic elastomers, polyamide thermoplastic elastomers, ethylene copolymer thermoplastic elastomers, 1,2 polybutadiene thermoplastic elastomers, trans-polyisoprene thermoplastic elastomers, thermoplastic natural rubber, chlorinated polyethylene thermoplastic elastomers, polysiloxane thermoplastic elastomers, thermoplastic fluoroelastomers, ionic thermoplastic elastomers.
7. The method for preparing a flexible piezoresistive shear force sensor according to claim 6, wherein in step S2, an 80 ℃ oil bath is used for heating for 2-5 h.
8. The method for preparing a flexible piezoresistive shear force sensor according to claim 1, wherein in step S3, the suspension is dried in a forced air oven at 80 ℃ for 24h, the organic solvent is completely removed to obtain the conductive composite material, the conductive composite material is sheared and mixed with the thermoplastic polymer B, and then extruded into a wire having an isolated double-percolation microstructure at a temperature of 180 ℃ using a single-screw extruder.
9. The method for manufacturing a flexible piezoresistive shear force sensor according to claim 1, wherein in step S4, the temperature of the 3D printing is 225 ℃.
10. The method for manufacturing a flexible piezoresistive shear force sensor according to claim 9, wherein in step S4, a light-weight hard rod is inserted into the printed sensor to amplify the shear force.
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| CN111649665A (en) * | 2020-06-18 | 2020-09-11 | 西南石油大学 | Cobweb-shaped flexible strain sensor capable of identifying strain direction and preparation method thereof |
| CN112014011A (en) * | 2020-07-20 | 2020-12-01 | 武汉理工大学 | Internal stress measuring device and preparation method thereof |
| CN112179263A (en) * | 2020-09-07 | 2021-01-05 | 嘉兴学院 | Flexible strain sensor with sawtooth groove structure and preparation method thereof |
| CN112721147A (en) * | 2020-12-03 | 2021-04-30 | 昆明理工大学 | Method for preparing graphene-based flexible bionic sensing material through 3D printing |
| CN115014594A (en) * | 2022-06-16 | 2022-09-06 | 东华大学 | Piezoresistive sensor and preparation method thereof |
| CN117283862A (en) * | 2023-11-24 | 2023-12-26 | 西南石油大学 | Preparation method of flexible strain sensor with double-seepage conductive network |
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| CN112179263A (en) * | 2020-09-07 | 2021-01-05 | 嘉兴学院 | Flexible strain sensor with sawtooth groove structure and preparation method thereof |
| CN112179263B (en) * | 2020-09-07 | 2022-02-18 | 嘉兴学院 | Flexible strain sensor with sawtooth groove structure and preparation method thereof |
| CN112721147A (en) * | 2020-12-03 | 2021-04-30 | 昆明理工大学 | Method for preparing graphene-based flexible bionic sensing material through 3D printing |
| CN115014594A (en) * | 2022-06-16 | 2022-09-06 | 东华大学 | Piezoresistive sensor and preparation method thereof |
| CN115014594B (en) * | 2022-06-16 | 2023-10-20 | 东华大学 | Piezoresistive sensor and preparation method thereof |
| CN117283862A (en) * | 2023-11-24 | 2023-12-26 | 西南石油大学 | Preparation method of flexible strain sensor with double-seepage conductive network |
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