CN112393829A - Pressure sensor based on composite conductive fabric and preparation method thereof - Google Patents
Pressure sensor based on composite conductive fabric and preparation method thereof Download PDFInfo
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- CN112393829A CN112393829A CN202011158885.XA CN202011158885A CN112393829A CN 112393829 A CN112393829 A CN 112393829A CN 202011158885 A CN202011158885 A CN 202011158885A CN 112393829 A CN112393829 A CN 112393829A
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- conductive fabric
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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Abstract
The invention discloses a pressure sensor based on a composite conductive fabric and a preparation method thereof. The preparation method comprises the following steps: soaking the fabric made of the polyester fiber material with the porous structure in alcohol for 5-10 minutes and cleaning; cutting the cleaned fabric into required size; placing the fabric obtained in the step (2) in graphene ink for soaking and extruding to obtain a composite conductive fabric; placing the composite conductive fabric in a fume hood for airing; and respectively coating silver paste on the top and the bottom of the dried composite conductive fabric and bonding an electrode. The pressure sensor prepared by the invention has the characteristics of low cost, high sensitivity, large measurement range and the like, is prepared by adopting a flexible material, and can be used for novel wearable equipment.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a pressure sensor based on a composite conductive fabric and a preparation method thereof.
Background
In recent years, with the continuous development of electronic information technology and material technology, intelligent wearable equipment is rapidly raised and greatly improved, and a new field is opened up for the development of information technology while the intelligent wearable equipment is greatly convenient for people to live. The rapid development of wearable devices has created a great need for new types of flexible sensors, particularly flexible pressure sensors. However, many existing pressure sensors are made of silicon as a substrate and based on a traditional microelectronic process, and cannot be applied to wearable devices. The flexible pressure sensor based on the new nano-material technology generally has the problems of low sensitivity, small measurable range and the like, and is limited in application to a certain extent. The pressure sensor based on the new material also has the problems of high material cost, complex process and the like, and meets a plurality of bottlenecks in market popularization.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the pressure sensor based on the composite conductive fabric and the preparation method thereof, wherein the pressure sensor is low in cost, non-toxic, pollution-free, simple in process and suitable for batch production.
The invention is realized by the following technical scheme.
The pressure sensor based on the composite conductive fabric is characterized by comprising two electrodes and the composite conductive fabric, wherein the electrodes are copper sheets or copper foil tapes, and the two electrodes are respectively bonded to the top and the bottom of the composite conductive fabric through silver paste.
Further, the composite conductive fabric is a porous structure made of polyester fibers soaked by graphene ink.
The preparation method based on the sensor is characterized by comprising the following steps:
(1) soaking the fabric made of the polyester fiber material with the porous structure in alcohol for 5-10 minutes and cleaning;
(2) cutting the cleaned fabric into required size;
(3) placing the fabric obtained in the step (2) in graphene ink for soaking and extruding to obtain a composite conductive fabric;
(4) placing the composite conductive fabric in a fume hood for airing;
(5) and respectively coating silver paste on the top and the bottom of the dried composite conductive fabric and bonding an electrode.
Further, the shape of the fabric in the step (2) is a cuboid.
Further, the graphene ink in the step (3) is composed of graphene nanoplatelets and deionized water, the sheet diameter of the graphene nanoplatelets is 2-5 μm, and the concentration of the graphene ink is 5-10 mg/mL.
Further, the composite conductive fabric in the step (5) is one or more layers.
Compared with the prior art, the composite conductive fabric prepared by the method has a regular porous structure and certain conductivity, when pressure acts on the pressure sensor, the porous structure of the composite conductive fabric is compressed, the connection state of the graphene sheet layers is changed, and the resistance of the graphene sheet layers is changed, so that a pressure signal can be converted into an electric signal. The sensor prepared by the method has the characteristics of low price of raw materials, no toxicity, no pollution and the like. The method has simple preparation process, is suitable for batch production, is easy for industrialization, and has extremely high market value and industrialization potential. The pressure sensor prepared by the method has the characteristics of low cost, high sensitivity, large measurement range and the like, is prepared by adopting a flexible material, and can be used for novel wearable equipment.
Drawings
FIG. 1 is a schematic structural view of a sensor prepared by the method of the present invention;
FIG. 2 is a schematic view of a preparation process of the present invention;
FIG. 3 is a graph of the pressure characteristics of a sensor made by the method of the present invention;
FIG. 4 is a graph showing the relative resistance change during walking, running, falling and jumping of a sensor prepared by the method of the present invention for gait recognition.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1-2, the pressure sensor based on the composite conductive fabric of the invention comprises two electrodes and the composite conductive fabric, wherein the electrodes are one of copper sheets and copper foil tapes, and the two electrodes are respectively bonded to the top and the bottom of the composite conductive fabric through silver paste. The composite conductive fabric is a porous structure made of polyester fibers soaked by graphene ink. The porous structured composite conductive fabric and the electrode were connected with silver paste to increase conductivity.
The preparation method comprises the following steps:
(1) soaking the fabric made of the polyester fiber material with the porous structure in alcohol for 5-10 minutes and cleaning;
(2) placing the cleaned fabric made of the polyester fiber in graphene ink for repeated soaking and extrusion to obtain a composite conductive fabric; the sheet diameter of the graphene nanoplatelets in the graphene ink is 2-5 microns, and the concentration of the graphene ink is 5-10 mg/mL.
The graphene ink is composed of graphene nanoplatelets, is a two-dimensional layered structure material, has the characteristics of light weight, thinness, high strength, good flexibility and the like, is not easy to damage, and is expected to be earnestly applied to the field of pressure sensors. Because the composite conductive fabric has more regular porous structures, when pressure acts on the pressure sensor, the structure is extruded, the connection state between the graphene micron sheets is changed, the resistance of the graphene micron sheets is also changed, and therefore pressure signals are converted into electric signals.
(3) Placing the composite conductive fabric in a fume hood for airing; the size and the shape of the composite conductive fabric are not limited and can be selected according to actual conditions, and preferably, the shape of the composite conductive fabric is a cuboid; the structure of the composite conductive fabric is a porous structure.
(4) Coating silver paste on the top and the bottom of the dried composite sponge and bonding an electrode; the thickness of the composite conductive fabric is not limited and can be selected according to actual conditions, and preferably, the thickness of the composite conductive fabric is formed by overlapping 3 layers of fabrics.
Example 1
Cutting a sponge made of polyester fiber into 2cm multiplied by 2cm, putting the sponge in a culture dish, and soaking the sponge in alcohol for 5 minutes for cleaning;
and (3) placing the cleaned sponge made of the polyester fiber in the graphene ink for repeated soaking and extrusion to obtain the composite conductive fabric. The graphene nanoplatelets in the graphene ink have the sheet diameter of 2 microns, and the concentration of the graphene ink is 5 mg/mL.
And (3) putting the composite conductive fabric in a fume hood for airing.
Coating silver paste on the top and the bottom of the dried composite conductive fabric and bonding copper foil tape electrodes to obtain the pressure sensor based on the composite conductive fabric, wherein the pressure sensor based on the composite conductive fabric is formed by stacking 3 layers of fabrics, the thickness is about 3mm, and the area is about 4cm2。
And connecting the pressure sensor based on the composite conductive fabric to a test circuit, applying pressure by using a tension and pressure tester, and recording the resistance value by using a digital multimeter.
Example 2
Cutting a sponge made of polyester fiber into 2cm multiplied by 2cm, putting the sponge in a culture dish, and soaking the sponge in alcohol for 10 minutes for cleaning;
and (3) placing the cleaned sponge made of the polyester fiber in the graphene ink for repeated soaking and extrusion to obtain the composite conductive fabric. Wherein the sheet diameter of the graphene nanoplatelets in the graphene ink is 5 μm. The concentration of the graphene ink is 10 mg/mL.
And (3) putting the composite conductive fabric in a fume hood for airing.
Coating silver paste on the top and the bottom of the dried composite conductive fabric and bonding copper foil tape electrodes to obtain the pressure sensor based on the composite conductive fabric, wherein the pressure sensor based on the composite conductive fabric is formed by stacking 3 layers of fabrics, the thickness is about 3mm, and the area is about 4cm2。
And connecting the pressure sensor based on the composite conductive fabric to a test circuit, applying pressure by using a tension and pressure tester, and recording the resistance value by using a digital multimeter.
Example 3
Cutting a sponge made of polyester fiber into 2cm multiplied by 2cm, putting the sponge in a culture dish, and soaking the sponge in alcohol for 7 minutes for cleaning;
and (3) placing the cleaned sponge made of the polyester fiber in the graphene ink for repeated soaking and extrusion to obtain the composite conductive fabric. Wherein the sheet diameter of the graphene nanoplatelets in the graphene ink is 3 μm. The concentration of the graphene ink is 7 mg/mL.
And (3) putting the composite conductive fabric in a fume hood for airing.
Coating silver paste on the top and the bottom of the dried composite conductive fabric and bonding a copper sheet electrode to obtain the pressure sensor based on the composite conductive fabric, wherein the pressure sensor based on the composite conductive fabric is prepared from a single-layer fabric, the thickness of the pressure sensor is about 1mm, and the area of the pressure sensor is about 4cm2。
And connecting the pressure sensor based on the composite conductive fabric to a test circuit, applying pressure by using a tension and pressure tester, and recording the resistance value by using a digital multimeter.
FIG. 3 shows the pressure characteristic curve of the pressure sensor in example 1, in which the measurement range is 140kPa and the sensitivity is as high as 0.23kPa-1, showing that the pressure sensor has both a large sensitivity and a large measurement range.
Fig. 4 is a graph showing the relative resistance change during walking and running of the sensor prepared in example 1 for gait recognition, which shows that the pressure sensor prepared in example 1 can respond to different exercise states and exercise speeds.
The following examples are given to illustrate the present invention, but are not intended to limit the scope of the present invention.
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. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.
Claims (6)
1. The pressure sensor based on the composite conductive fabric is characterized by comprising two electrodes and the composite conductive fabric, wherein the electrodes are copper sheets or copper foil tapes, and the two electrodes are respectively bonded to the top and the bottom of the composite conductive fabric through silver paste.
2. The sensor of claim 1, wherein the composite conductive fabric is a porous structure of a polyester fiber material impregnated with graphene ink.
3. A method for preparing a sensor according to any one of claims 1-2, wherein the method comprises the steps of:
(1) soaking the fabric made of the polyester fiber material with the porous structure in alcohol for 5-10 minutes and cleaning;
(2) cutting the cleaned fabric into required size;
(3) placing the fabric obtained in the step (2) in graphene ink for soaking and extruding to obtain a composite conductive fabric;
(4) placing the composite conductive fabric in a fume hood for airing;
(5) and respectively coating silver paste on the top and the bottom of the dried composite conductive fabric and bonding an electrode.
4. The method according to claim 3, wherein the fabric in the step (2) has a rectangular parallelepiped shape.
5. The preparation method according to claim 3, wherein the graphene ink in the step (3) is composed of graphene nanoplatelets and deionized water, the sheet diameter of the graphene nanoplatelets is 2 μm-5 μm, and the concentration of the graphene ink is 5mg/mL-10 mg/mL.
6. The method according to claim 3, wherein the composite conductive fabric in the step (5) is one or more layers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011158885.XA CN112393829A (en) | 2020-10-26 | 2020-10-26 | Pressure sensor based on composite conductive fabric and preparation method thereof |
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| CN202011158885.XA CN112393829A (en) | 2020-10-26 | 2020-10-26 | Pressure sensor based on composite conductive fabric and preparation method thereof |
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Cited By (3)
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| CN113827401A (en) * | 2021-09-10 | 2021-12-24 | 重庆大学 | Integrated electronic gauze system |
| CN114184307A (en) * | 2021-12-15 | 2022-03-15 | 深圳先进技术研究院 | Microstructure flexible pressure sensor and preparation method thereof |
| CN114214833A (en) * | 2021-12-09 | 2022-03-22 | 西安理工大学 | Preparation method of flexible conductive fabric sensor based on silver nanowires/graphene |
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