CN113155326A - Flexible self-supporting fiber woven touch sensor - Google Patents
Flexible self-supporting fiber woven touch sensor Download PDFInfo
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- CN113155326A CN113155326A CN202110255774.9A CN202110255774A CN113155326A CN 113155326 A CN113155326 A CN 113155326A CN 202110255774 A CN202110255774 A CN 202110255774A CN 113155326 A CN113155326 A CN 113155326A
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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
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
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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
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
- G01L1/146—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors for measuring force distributions, e.g. using force arrays
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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention provides a flexible self-supporting fiber woven touch sensor which is divided into two structural forms of a sensing unit and a sensing array, wherein the sensing unit comprises two linear electrodes wrapped with high-conductivity substances and ionic gel containing ionic liquid. The ionic gel is positioned between two electrode contact points, and a plurality of sensing units can form a sensing array. The linear electrode is prepared by wrapping a linear substrate with a conductive substance. The ionic gel is prepared by mixing and solidifying a mixture of an ionic liquid, a solvent and a high molecule, wherein the mass ratio of the ionic liquid to the high molecule is (1-3) to (8-10) to (1-3). The sensor unit and the array thereof have the sensing characteristics of high sensitivity, wide detection range and high response rate, have the structural advantages of high flexibility, self-supporting and cutting, can be applied to sensitive pressure sensing, two-dimensional space pressure distribution monitoring and the like, and are applied to flexible wearable equipment and health care robots.
Description
Technical Field
The invention belongs to the technical field of flexible sensing, and particularly relates to a flexible self-supporting fiber woven touch sensor.
Background
The flexible touch sensor has high flexibility, and is widely applied to electronic skins, soft robot technology and health monitoring systems. However, most of the currently reported flexible touch sensors are two-dimensional planar type, and the device body needs to be prepared on a planar substrate such as flexible fiber cloth or rubber, so that the sensing unit is large, poor in flexibility and poor in air permeability, and the application of the device body in electronic skin and wearable equipment is limited. Moreover, the use of the additional substrate is not favorable for the perception of real tactile pressure, and the existence form of the solid plane is not favorable for the conformal attachment of the three-dimensional space surface of the complex three-dimensional object. Therefore, it is necessary to design a flexible touch sensor with self-supporting function, good air permeability and small sensing unit.
Disclosure of Invention
Aiming at the difficult problems in the field, the invention provides a flexible self-supporting fiber woven touch sensor, wherein electrodes are made of linear conductive materials, a pressure sensing contact of a sensing unit or an array is formed by wrapping ion gel at the lap joint of two linear electrodes, and high sensitivity, wide detection range and quick response time are obtained based on a super-capacitor sensing principle. Meanwhile, the whole fibrous sensor is only composed of the linear electrodes and the ionic gel, has the characteristics of flexibility and self-supporting, and does not need an additional bearing substrate.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a flexible self-supporting fiber woven touch sensing unit comprises two linear electrodes wrapped with conductive substances and ionic gel containing ionic liquid, wherein the ionic gel is located between contact points of the two linear electrodes, the linear electrodes are made by wrapping the conductive substances with linear base materials, the ionic gel is made by mixing and solidifying a mixture of the ionic liquid, a solvent and a high polymer material, and the mass ratio of the ionic gel to the solvent to the high polymer material is (1-3) - (8-10) - (1-3).
The ionic gel coated on the electrode has a solidification force like resin glue after being dried, and can not fall off after being used for many times, and the elasticity of the ionic gel is larger than that of the resin glue. After micro ionic gel is dripped between two linear electrodes wrapped with ionic gel and dried, a sensing unit is formed, and the sensing unit can form a net array after being expanded, can form a window screen and a fishing net by itself, bears the weight and does not need any substrate.
Preferably, the solvent includes but is not limited to one or a mixture of two or more of dimethylformamide, N-methylpyrrolidone, dimethylacetamide, triethyl phosphate, and dimethylsulfoxide.
Preferably, the polymer material includes, but is not limited to, one or a mixture of two or more of polyvinylidene fluoride, tetrafluoroethylene and tetraiodoethylene.
Preferably, the ionic liquid is liquid at or near room temperature and is completely formed into a salt by organic cations and inorganic or organic anions, the cations include but are not limited to one or a mixture of more than two of quaternary ammonium salt ions, quaternary phosphonium salt ions, imidazole salt ions and pyrrole salt ions, and the anions include but are not limited to one or a mixture of more than two of halogen ions, tetrafluoroborate ions and hexafluorophosphate ions.
Preferably, the threadlike substrate includes, but is not limited to, cotton or nylon threads composed of single or multiple strands.
The sizes of the linear electrode and the ionic gel can be adjusted according to the using condition and the using environment, and both have tailorability.
Preferably, the conductive material is a conductive material such as carbon, metal or conductive polymer, including but not limited to one or a mixture of two or more of graphite, acetylene black, carbon nanotube, graphene, MXene, silver nanowire, silver particle, copper particle, polypyrrole and polythiophene.
Preferably, the sensing unit is constructed in a form including, but not limited to, a cross, an oblique cross, or a twisted cable of two wire electrodes wrapping an ionic gel.
The second purpose of the present invention is to provide a fiber-woven type tactile sensing array, which is composed of a plurality of sensing units, and the structural form of the sensing array includes, but is not limited to, a cross shape or an oblique cross shape of a plurality of linear electrodes wrapping ionic gel, the whole sensing array is in a fishing net shape with flexible self-supporting characteristics, and the sensing array can be laid on a two-dimensional plane or wrapped on the three-dimensional space surface of a complex three-dimensional object.
A third object of the present invention is to provide a fiber-woven type tactile sensor, which is a sensing unit or a sensing array.
The fourth purpose of the invention is to provide a preparation method of the flexible self-supporting fiber woven touch sensor, which comprises the following steps:
(1) preparation of wire-like electrode
Dipping the linear substrate in an alkaline aqueous solution, taking out and rinsing the linear substrate with deionized water, uniformly dipping conductive substance slurry on the whole body after drying, then drying the linear substrate in a drying oven at 40 ℃, and performing 3-5 cycles to obtain a linear electrode with high conductivity;
(2) preparation of Ionic gels
Weighing the ionic liquid, the solvent, the high polymer material and the ionic liquid according to the mass ratio of (1-3) to (8-10) to (1-3), mixing the ionic liquid, the solvent, the high polymer material and the ionic liquid, stirring the mixture by using a magnetic stirrer for 2 to 4 hours, and fully and uniformly mixing the mixture until the high polymer material is completely dissolved to obtain an ionic gel solution;
(3) preparation of the sensor
Uniformly dipping the linear electrodes in the ionic gel solution, drying in a room temperature or an oven, then performing cross, oblique cross or mutual stranding arrangement on the two linear electrodes, coating the ionic gel solution on the contact points of the two linear electrodes, and drying in the room temperature or the oven to obtain a sensing unit; placing a plurality of linear electrodes in a crosswise or obliquely crossed manner, coating an ionic gel solution on a plurality of formed contact points between the two linear electrodes, and drying at room temperature or in an oven to obtain a sensing array;
(4) wiring of sensor
And silver adhesive is used for adhering conductive metal wires at two ends of the electrodes of the sensing unit or the array, so that the sensor is electrically connected with the outside.
The sensor can be applied to sensitive pressure sensing, two-dimensional space pressure distribution monitoring and the like, and is used for flexible wearable equipment and health care robots.
The basic working principle of the sensor of the invention is as follows:
when pressure is applied to the sensor, the electrode and the dielectric medium of the sensor deform under the action of the pressure, so that the contact area between the dielectric medium and the electrode is enlarged, the distance is reduced, and the capacitance is increased; when the pressure disappears, the dielectric layer will restore to its original shape and the capacitance will restore to its original value. The change of the capacitance can be converted into an electric signal and transmitted to a subsequent processing circuit, so that the force is monitored.
When the electrode layer is contacted with the two sides of the ionic gel layer, under the action of an external power supply, the internal surface charges of the electrode can absorb ions from the electrolyte, the ions form an interface layer with the same charge quantity as the charge quantity of the internal surface of the electrode and the opposite sign on the electrolyte side of the electrode or the ionic gel interface, and because the electrode or the electrolyte interface has potential difference, the charges of the two layers cannot cross the boundary and neutralize each other, so that the super capacitor with stable structure is formed.
A conductive material (such as graphene, MXene, CNT and the like) electrode layer is wrapped by a linear substrate, a solvent, a high polymer material and ionic liquid are mixed, a dielectric medium is prepared after uniform stirring, then the electrode is dipped in the dielectric medium and dried, the two electrodes are prepared into a twisted shape, and then the sensor is shaped and integrally dipped in ionic gel to obtain the sensor. And connecting the prepared sensor to a capacitance measuring circuit to realize pressure mapping.
Compared with the prior art, the flexible self-supporting fiber woven touch sensor has the following beneficial effects:
(1) the sensor electrode is obtained by wrapping a linear substrate with a conductive substance, a large number of fiber microstructures are arranged in the linear substrate, so that the compression space can be effectively increased, and the sensor electrode is obtained after the linear substrate is dipped in ionic gelThe elasticity can effectively prolong the service life; the conductive substance and the base material of the electrode are convenient to obtain, the price is low, and the conductivity can be adjusted according to dipping times. The two electrodes are crossed to form a sensing unit, point contact is formed between the two electrodes, and compared with a sensor with a sandwich structure, the sensitivity can reach 9.62kPa-1And the improvement is 54 times.
(2) The pressure range which can be detected by the sensor is 0-580kPa, the preparation process is simple, and the sensor unit can be obtained after two electrodes are dipped with the ionic gel and dried; the sensor has good cutting performance, and the size can be flexibly adjusted on the premise that the performance and the structure are not damaged.
(3) The sensor has a self-supporting function, an additional substrate is not needed, and the flexibility, the sensitivity and the application range of the sensor are greatly improved; after the sensor is prepared into an array, the sensor can be used for detecting the spatial pressure distribution, and can be prepared into wearable equipment with good air permeability when the distance between electrodes is reduced; and the sensor array can be freely attached to the three-dimensional surface of the three-dimensional object to detect the pressure distribution in the three-dimensional space.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view and a scanning electron micrograph of a sensor of the present invention, wherein,
FIG. 1(a) is a scanning electron micrograph of the electrode surface of the sensor of the present invention,
FIG. 1(b) is a schematic diagram of the overall structure of the crisscross sensing unit of the sensor of the present invention,
FIG. 1(c) is a scanning electron microscope image of the cross section of an ion-coated gel of an electrode of a sensor according to the present invention;
FIG. 2 is a schematic diagram of a sensor of the present invention in a hank configuration;
FIG. 3 is a schematic diagram of the working principle of the sensor of the present invention;
FIG. 4 is a schematic view of a 6 × 6 sensor array according to the present invention;
fig. 5 is a pictorial and pressure profile of a 6 x 6 sensor array, wherein,
figures 5(a) - (c) are schematic diagrams of a 6 x 6 sensor array of the present invention with supportable,
FIG. 5(d) is a physical diagram of a sensor array of the present invention fabricated on a surface of a ping-pong device having a complex shape,
figure 5(e) is a 10g weight placed on the surface of a 6 x 6 sensor array of the present invention,
figure 5(f) is a 10g weight lying on the surface of a 6 x 6 sensor array of the present invention,
figure 5(g) shows a 0.5-dollar coin placed on the surface of a 6 x 6 sensor array according to the invention,
figure 5(h) shows a finger placed on the surface of the space sensor array,
figure 5(i) is a graph of the pressure profile corresponding to a 10g weight placed on the surface of a 6 x 6 sensor array of the present invention,
figure 5(j) is a graph of the pressure profile corresponding to a 10g weight lying on the surface of a 6 x 6 sensor array of the present invention,
figure 5(k) is a pressure profile corresponding to a 0.5-dollar coin placed on the surface of a 6 x 6 sensor array of the invention,
FIG. 5(l) is a corresponding pressure profile for a finger placed on the surface of the space sensor array;
FIG. 6 is a partial view of a 6X 6 sensor array A of the present invention;
FIG. 7 is a pressure-volume relationship diagram of a sensor according to embodiments 1-3 of the present invention;
FIG. 8 is a pressure-volume relationship diagram of a sensor of comparative example 1 of the present invention.
In the figure: 1. a first linear electrode; 2. a dielectric; 3. and a second linear electrode.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
Example 1
The embodiment provides a flexible self-supporting fiber woven tactile sensor for monitoring the pressure of a human body or a robot and a catheter part, which comprises two linear electrodes and a dielectric medium containing ionic liquid.
The manufacturing process of the flexible self-supporting fiber woven touch sensor comprises the following steps:
(1) preparation of the electrodes
Soaking 2 cotton threads with the length of 10cm and the thickness of 100D in a sodium hydroxide aqueous solution with the concentration of 5g/L, taking out, rinsing the cotton threads with deionized water, then placing the cotton threads in a drying oven at 40 ℃ for drying, uniformly dipping MXene solution with the concentration of 5mg/ml on the whole body after drying, then drying the cotton threads in the drying oven at 40 ℃, and performing 3 cycles to obtain an electrode with good conductivity;
(2) preparation of Ionic gels
Weighing a solvent dimethylformamide, a high molecular substance polyvinylidene fluoride and an ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate according to a mass ratio of 10:1:1, mixing the two, stirring for 2-4 hours by using a magnetic stirrer, and obtaining an ionic gel solution after polyvinylidene fluoride is completely dissolved;
(3) preparation of the sensor
Uniformly dipping the electrodes in ionic gel, drying in a 40 ℃ oven, then coating a proper amount of ionic gel solution on the cross point of the two electrodes, placing the two electrodes in a cross way, and drying the whole sensor in the 40 ℃ oven to obtain the sensor;
(4) wiring of sensor
And silver adhesive is used for sticking conductive metal wires at two ends of the electrode, so that the sensor is electrically connected with the outside.
The principle of the sensor is as shown in fig. 3, under the action of pressure, physical contact is generated between a dielectric medium and an electrode, the contact area is increased along with the increase of a load, when the load disappears, the sensor is restored to the original state, and the capacitance value is restored to the initial value; under the action of tensile force, physical contact is generated between the dielectric and the electrode, the contact area is increased along with the increase of the load, when the load disappears, the sensor is restored, and the capacitance value is restored to the initial value.
Example 2
The embodiment provides a flexible self-supporting fiber woven tactile sensor for monitoring the pressure of a human body or a robot and a catheter part, which comprises two linear electrodes and a dielectric medium containing ionic liquid.
The manufacturing process of the flexible self-supporting fiber woven touch sensor comprises the following steps:
(1) preparation of the electrodes
Soaking 2 cotton threads 10cm long and 100D thick in a sodium hydroxide aqueous solution with the concentration of 5g/L, taking out, rinsing the cotton threads with deionized water, then placing the cotton threads in a drying oven at 40 ℃ for drying, uniformly dipping a CNT solution with the concentration of 5mg/ml on the whole body after drying, then drying the cotton threads in the drying oven at 40 ℃, and performing 3 cycles to obtain an electrode with good conductivity;
(2) preparation of Ionic gels
Weighing a solvent dimethylformamide, a high molecular substance polyvinylidene fluoride and an ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate according to a mass ratio of 10:1:1, mixing the two, stirring for 2-4 hours by using a magnetic stirrer, and obtaining an ionic gel solution after polyvinylidene fluoride is completely dissolved;
(3) preparation of the sensor
Uniformly dipping the electrodes in ionic gel, drying in a 40 ℃ oven, then coating a proper amount of ionic gel solution on the cross point of the two electrodes, placing the two electrodes in a cross way, and drying the whole sensor in the 40 ℃ oven to obtain the sensor;
(4) wiring of sensor
And silver adhesive is used for sticking conductive metal wires at two ends of the electrode, so that the sensor is electrically connected with the outside.
The principle of the sensor is as shown in fig. 3, under the action of pressure, physical contact is generated between a dielectric medium and an electrode, the contact area is increased along with the increase of a load, when the load disappears, the sensor is restored to the original state, and the capacitance value is restored to the initial value; under the action of tensile force, physical contact is generated between the dielectric and the electrode, the contact area is increased along with the increase of the load, when the load disappears, the sensor is restored, and the capacitance value is restored to the initial value.
Example 3
The embodiment provides a flexible self-supporting fiber woven tactile sensor for monitoring the pressure of a catheter head, which comprises two linear electrodes and a dielectric medium containing ionic liquid.
The manufacturing process of the flexible self-supporting fiber woven touch sensor comprises the following steps:
(1) preparation of the electrodes
Soaking 2 cotton threads with the length of 10cm and the thickness of 100D in a sodium hydroxide aqueous solution with the concentration of 5g/L, taking out, rinsing the cotton threads with deionized water, then placing the cotton threads in a drying oven at 40 ℃ for drying, uniformly dipping MXene solution with the concentration of 5mg/ml on the whole body after drying, then drying the cotton threads in the drying oven at 40 ℃, and performing 3 cycles to obtain an electrode with good conductivity;
(2) preparation of Ionic gels
Weighing a solvent dimethylformamide, a high molecular substance polyvinylidene fluoride and an ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate according to a mass ratio of 10:1:1, mixing the two, stirring for 2-4 hours by using a magnetic stirrer, and obtaining an ionic gel solution after polyvinylidene fluoride is completely dissolved;
(3) preparation of the sensor
Uniformly dipping the electrodes into the ionic gel, drying in a 40 ℃ oven, winding the two electrodes into a twisted shape, dipping the whole twisted sensor into the dielectric solution again, and drying in the 40 ℃ oven to obtain the sensor;
(4) wiring of sensor
And silver adhesive is used for sticking conductive metal wires at two ends of the electrode, so that the sensor is electrically connected with the outside.
Comparative example 1
The embodiment provides a flexible self-supporting fiber woven tactile sensor for monitoring the pressure of a human body or a robot and a catheter part, which comprises two linear electrodes and a dielectric medium containing ionic liquid.
The manufacturing process of the flexible self-supporting fiber woven touch sensor comprises the following steps:
(1) preparation of the electrodes
Soaking 2 cotton threads with the length of 10cm and the thickness of 100D in a sodium hydroxide aqueous solution with the concentration of 5g/L, taking out, rinsing the cotton threads with deionized water, then placing the cotton threads in a drying oven at 40 ℃ for drying, uniformly dipping MXene solution with the concentration of 5mg/ml on the whole body after drying, then drying the cotton threads in the drying oven at 40 ℃, and performing 3 cycles to obtain an electrode with good conductivity;
(2) preparation of Ionic gels
Weighing a solvent dimethylformamide, a high molecular substance polyvinylidene fluoride and an ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate according to a mass ratio of 10:1:0, mixing the two, stirring for 2-4 hours by using a magnetic stirrer, and obtaining an ionic gel solution after polyvinylidene fluoride is completely dissolved;
(3) preparation of the sensor
Uniformly dipping the electrodes in ionic gel, drying in a 40 ℃ oven, then coating a proper amount of ionic gel solution on the cross point of the two electrodes, placing the two electrodes in a cross way, and drying the whole sensor in the 40 ℃ oven to obtain the sensor;
(4) wiring of sensor
And silver adhesive is used for sticking conductive metal wires at two ends of the electrode, so that the sensor is electrically connected with the outside.
The electrode is obtained by dipping nylon ropes with MXene solution for multiple times and drying, a scanning electron microscope on the surface of the electrode is shown in figure 1(a), and a large amount of uniform MXene particles are distributed on the surface of the nylon ropes, so that the electrode has good conductivity; after the electrode is wrapped with the ionic gel, the electrode has good elasticity and can protect MXene from falling off the nylon rope, and a cross section scanning electron microscope image is shown in figure 1 (c); the two electrodes coated with the ionic gel are placed in a crossing manner to form a sensing unit, and the schematic diagram is shown in fig. 1 (b).
The principle of the sensor is as shown in fig. 3, under the action of pressure, physical contact is generated between a dielectric medium and an electrode, the contact area is increased along with the increase of a load, when the load disappears, the sensor is restored to the original state, and the capacitance value is restored to the initial value; under the action of tensile force, physical contact is generated between the dielectric and the electrode, the contact area is increased along with the increase of the load, when the load disappears, the sensor is restored, and the capacitance value is restored to the initial value.
In order to verify the static characteristics of the tactile sensor, the wires of examples 1 to 3 and comparative example 1 were first connected to an LCR meter, and then the relationship between the sensor capacitance and the pressure was measured using a press and the LCR meter to obtain capacitance curves as shown in FIGS. 7 to 8, and the pressure was detected at 0 to 580 kPa. The capacitance values obtained by the pressure sensors prepared in the embodiments 1 to 3 under different pressures can stably and accurately reflect the external pressure. The first stage sensitivity in example 1 was 9.62kPa-1And the second stage sensitivity was 0.99kPa-1(ii) a The first stage sensitivity in example 2 was 8.73kPa-1And the second stage sensitivity was 0.82kPa-1. In example 2, the conductive material MXene solution is replaced with the CNT solution on the basis of example 1, the capacitance response curve of the sensor in example 1 is higher than that of example 2, and it can be seen that the device performance is different due to different conductive properties in the case of different conductive materials, but all the purposes of experiments can be achieved. Example 3 is a cross sensor modified from the cross sensor of example 1 to a twisted sensor, in which the capacitance changes significantly when pressure is applied to the sensor, and the first stage sensitivity is 7.21kPa-1And the second stage sensitivity was 0.68kPa-1. Comparative example 1 the content of ionic liquid was changed to 0 on the basis of example 1, and the first-stage sensitivity was 0.18kPa-1And the second-stage sensitivity was 0.005kPa-1The sensitivity of each stage is greatly reduced, and the sensitivity of the first stage is 1/54 of example 1; the second stage sensitivity is 1/198 of example 1, and it can be seen that the ionic liquid is critical to the formation of an electrical double layer at the sensor interface and is also important to improve the sensitivity of the sensor.
A 6 × 6 sensor array (schematic view is fig. 4, and physical view is fig. 5) was prepared according to the preparation method of the sensor in example 1, and it can be seen that the sensor array has a self-supporting function, does not require a substrate, can be lifted using tweezers, and has a fishing net-like function, in which a 10g weight is wrapped without being damaged. To verify the feasibility of the sensor array, we placed a 10g weight, a 0.5-element coin, respectively, above the sensor array, and in their corresponding pressure profiles, the location and magnitude of the pressure application was shown, and the coin profile was clearly visible. The sensor array can be prepared into a 2D plane structure, can be attached to the surface of a 3D complex object, such as a table tennis ball, and can clearly see the position of applied pressure on a pressure distribution diagram when a finger touches the sensing unit. If the distance between the electrodes is reduced, the wearable device can be prepared.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A flexible self-supporting fiber woven tactile sensing unit, comprising: the ionic gel is prepared by mixing and solidifying a mixture of ionic liquid, a solvent and a high polymer material, wherein the mass ratio of the ionic gel to the high polymer material is (1-3) to (8-10) to (1-3).
2. The fiber woven haptic sensing unit of claim 1, wherein: the solvent includes but is not limited to one or a mixture of more than two of dimethylformamide, N-methylpyrrolidone, dimethylacetamide, triethyl phosphate and dimethyl sulfoxide.
3. The fiber woven haptic sensing unit of claim 1, wherein: the polymer material includes but is not limited to one or a mixture of more than two of polyvinylidene fluoride, tetrafluoroethylene and tetraiodoethylene.
4. The fiber woven tactile sensor according to claim 1, wherein: the ionic liquid is liquid at room temperature or near room temperature and is completely formed by organic cations and inorganic or organic anions, the cations include but are not limited to one or a mixture of more than two of quaternary ammonium salt ions, quaternary phosphonium salt ions, imidazole salt ions and pyrrole salt ions, and the anions include but are not limited to one or a mixture of more than two of halogen ions, tetrafluoroborate ions and hexafluorophosphate ions.
5. The fiber woven haptic sensing unit of claim 1, wherein: the threadlike substrate includes, but is not limited to, cotton or nylon threads composed of single or multiple strands.
6. The fiber woven haptic sensing unit of claim 1, wherein: the conductive substance is carbon, metal or conductive polymer, and includes but is not limited to one or a mixture of two or more of graphite, acetylene black, carbon nanotubes, graphene, MXene, silver nanowires, silver particles, copper particles, polypyrrole and polythiophene.
7. The fiber woven haptic sensing unit of claim 1, wherein: the sensing unit is formed in a cross shape, an inclined cross shape or a mutual stranded cable shape of two linear electrodes wrapping the ionic gel.
8. A fiber-woven tactile sensory display, comprising: the sensing array is composed of a plurality of sensing units as claimed in any one of claims 1 to 7, and the structural form of the sensing array includes, but is not limited to, a cross shape or an inclined cross shape of a plurality of linear electrodes wrapping ionic gel, the whole body is in a fishing net shape with flexible self-supporting characteristics, and the sensing array can be laid on a two-dimensional plane or wrapped on the three-dimensional space surface of a complex three-dimensional object.
9. A fiber woven tactile sensor, comprising: the sensor is the sensing unit of any one of claims 1 to 7 or the sensing array of claim 8.
10. The method of making a flexible self-supporting fiber woven tactile sensor of claim 9, wherein: the method specifically comprises the following steps:
(1) preparation of wire-like electrode
Dipping the linear substrate in an alkaline aqueous solution, taking out and rinsing the linear substrate with deionized water, uniformly dipping conductive substance slurry on the whole body after drying, then drying the linear substrate in a drying oven at 40 ℃, and performing 3-5 cycles to obtain a linear electrode with high conductivity;
(2) preparation of Ionic gels
Weighing the ionic liquid, the solvent, the high polymer material and the ionic liquid according to the mass ratio of (1-3) to (8-10) to (1-3), mixing the ionic liquid, the solvent, the high polymer material and the ionic liquid, stirring the mixture by using a magnetic stirrer for 2 to 4 hours, and fully and uniformly mixing the mixture until the high polymer material is completely dissolved to obtain an ionic gel solution;
(3) preparation of the sensor
Uniformly dipping the linear electrodes in the ionic gel solution, drying in a room temperature or an oven, then performing cross, oblique cross or mutual stranding arrangement on the two linear electrodes, coating the ionic gel solution on the contact points of the two linear electrodes, and drying in the room temperature or the oven to obtain a sensing unit; placing a plurality of linear electrodes in a crosswise or obliquely crossed manner, coating an ionic gel solution on a plurality of formed contact points between the two linear electrodes, and drying at room temperature or in an oven to obtain a sensing array;
(4) wiring of sensor
And silver adhesive is used for adhering conductive metal wires at two ends of the electrodes of the sensing unit or the array, so that the sensor is electrically connected with the outside.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113667059A (en) * | 2021-09-09 | 2021-11-19 | 天津工业大学 | Preparation method of ionic gel pressure sensing device for gesture recognition |
| CN114608716A (en) * | 2022-03-24 | 2022-06-10 | 广东粤港澳大湾区协同创新研究院 | Flexible temperature and pressure bimodal sensor and preparation and test method thereof |
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