CN114935304B - Self-repairable high-sensitivity flexible strain sensor and preparation method and repair method thereof - Google Patents
Self-repairable high-sensitivity flexible strain sensor and preparation method and repair method thereof Download PDFInfo
- Publication number
- CN114935304B CN114935304B CN202210401913.9A CN202210401913A CN114935304B CN 114935304 B CN114935304 B CN 114935304B CN 202210401913 A CN202210401913 A CN 202210401913A CN 114935304 B CN114935304 B CN 114935304B
- Authority
- CN
- China
- Prior art keywords
- strain
- self
- sensor
- substrate
- strain resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Self-repairing high-sensitivity flexible strain sensor and preparation method and repairing method thereof. The problem that the current flexible strain sensor can not be repaired is mainly solved. The method is characterized in that: comprising a substrate and a strain resistance; the melting point of the strain resistor is lower than that of the substrate; the resistance of the strain resistor is smaller than that of the base material in an initial state, and the resistance of the strain resistor after stretching is larger than that of the base material. The self-repairable high-sensitivity flexible strain sensor, the preparation method and the repair method thereof have high sensitivity and self-repairability, and the accuracy of the strain sensor is greatly improved by designing a 'double-channel' current path in the test process; the maximum tensile strain limit of the flexible strain sensor can reach 150%, and the micro strain of 0.5% can be detected. The self-repairing of the sensor cracks is realized by controlling the solid-liquid state change of the low-temperature alloy through Joule heat. By researching the resistance change rate of the sensor under different stretching ratios and returning to the initial performance after repair, the sensor is verified to have higher detection precision and better self-repair property.
Description
Technical Field
The invention relates to the field of flexible strain sensors, in particular to a self-repairable high-sensitivity flexible strain sensor, a preparation method thereof and a repair method thereof.
Background
In recent years, flexible strain sensors have been widely focused on due to their comfort and flexibility, and are applied in the fields of human motion detection, gesture recognition, health monitoring, human-computer interaction, and the like. In order to meet the high-precision detection requirement of the wearable equipment, the improvement of the sensitivity is one of the hot research directions of the flexible strain sensor. In the practical application process of the flexible strain sensor, functional materials therein are easy to generate cracks due to reciprocating stretching, so that the test precision is directly affected, and how to realize self-repair of the cracks has important significance for improving the reliability of the flexible strain sensor.
Disclosure of Invention
In order to overcome the defects of the background technology, the invention provides a self-repairable high-sensitivity flexible strain sensor, a preparation method and a repair method thereof, and mainly solves the problem that the conventional flexible strain sensor cannot be repaired.
The technical scheme adopted by the invention is as follows:
the self-repairing high-sensitivity flexible strain sensor comprises a substrate and a strain resistor;
the melting point of the strain resistor is lower than the melting point of the substrate;
the resistance of the strain resistor in an initial state is smaller than that of the base material, and the resistance of the strain resistor after stretching is larger than that of the base material.
The strain resistor is made of indium-bismuth-tin alloy.
The melting point of the strain resistor is 45-50 ℃.
The base material is prepared by mixing platinum silica gel and graphene.
The preparation method of the self-repairable high-sensitivity flexible strain sensor comprises the following steps of:
firstly, mixing Ecoflex-A and Ecoflex-B solutions according to a volume of 1:1, and mixing the mixed solutions with graphene according to a mass of 1: fully mixing and stirring the materials according to the proportion of 0.13, and standing the materials at room temperature for a period of time to remove bubbles;
casting the mixed solution into a manufactured mould, placing the mould into an oven at 60-70 ℃ and heating for 110-130 min,
step three, separating the substrate from the die, and carrying out plasma treatment on the surface of the substrate for 2-3 min;
fourthly, placing the strain resistor sheet on the surface of the base material, heating the alloy to 50 ℃ by using a heat source, melting the strain resistor, coating a layer of film with the thickness of 0.1mm to 0.3mm on the base material by using the melted strain resistor,
and fifthly, spin-coating a protective layer with the thickness of 1-3 mm on the surface of the film.
And step four, adsorbing the substrate on the surface of a spin coating table, placing a strain resistor sheet on the surface of the substrate, heating the alloy to 50 ℃ by using a hot air gun, melting the strain resistor, and coating a film with the thickness of 0.1mm on the substrate by using the melted strain resistor.
And fifthly, coating and curing the protective layer by using the Ecoflex-A and Ecoflex-B solutions in the step 1.
The method for repairing the self-repairable high-sensitivity flexible strain sensor comprises the following steps of firstly, applying current to two ends of the sensor, generating larger Joule heat in the sensor, enabling the strain resistance to reach a melting point and melting, and repairing cracks at the moment;
and step two, after the temperature is reduced to the room temperature, the strain resistance layer is restored to an initial state, so that the self-repairing process of the flexible strain sensor is realized.
The initial current applied was 100mA.
The beneficial effects of the invention are as follows: the self-repairable high-sensitivity flexible strain sensor, the preparation method and the repair method thereof have high sensitivity and self-repairability, and the accuracy of the strain sensor is greatly improved by designing a 'double-channel' current path in the test process; the maximum tensile strain limit of the flexible strain sensor can reach 150%, and the micro strain of 0.5% can be detected. The self-repairing of the sensor cracks is realized by controlling the solid-liquid state change of the low-temperature alloy through Joule heat. By researching the resistance change rate of the sensor under different stretching ratios and returning to the initial performance after repair, the sensor is verified to have higher detection precision and better self-repair property.
Drawings
FIG. 1 is a self-healing flowchart of one embodiment of the present invention.
FIG. 2 is a flow chart of the preparation of an embodiment of the present invention.
FIG. 3a is a graph of sensor tensile change rate versus resistivity change rate; FIG. 3b is a graph of sensor stretch and repair resistance change.
Detailed Description
The invention is further described below with reference to the accompanying drawings: as shown, the self-repairing high-sensitivity flexible strain sensor comprises a substrate 1 and a strain resistor 2;
the melting point of the strain resistor is lower than the melting point of the substrate;
the resistance of the strain resistor in an initial state is smaller than that of the base material, and the resistance of the strain resistor after stretching is larger than that of the base material.
The substrate is flexible and stretchable, when the sensor is not stretched, current only passes through the strain resistance layer with low resistance, when the sensor starts to stretch, the strain resistance layer can generate cracks, the current can form a 'double channel' between the low-temperature alloy and the substrate (the strain resistance can generate a plurality of cracks when stretched, the current can pass through the strain resistance, the strain resistance crack resistance is larger and then goes to the substrate according to the principle, the specific principle is shown in fig. 2, and as one of the alternative schemes, wires can be connected at two ends of the strain resistance.
The strain resistor is made of indium-bismuth-tin alloy. The melting point of the indium-bismuth-tin alloy is 47 ℃, so that the repair is convenient, the melting point of the indium-bismuth-tin alloy is 47 ℃, the indium-bismuth-tin alloy is solid at normal temperature, and the solid-liquid conversion can be regulated and controlled through temperature.
The melting point of the strain resistor is 45-50 ℃.
The base material is prepared by mixing platinum silica gel and graphene.
The preparation method of the self-repairable high-sensitivity flexible strain sensor comprises the following steps of:
firstly, mixing Ecoflex-A and Ecoflex-B solutions according to a volume of 1:1, and mixing the mixed solutions with graphene according to a mass of 1: fully mixing and stirring the materials according to the proportion of 0.13, and standing the materials at room temperature for a period of time to remove bubbles;
casting the mixed solution into a manufactured mould, placing the mould into an oven at 60-70 ℃ and heating for 110-130 min,
step three, separating the substrate from the die, performing plasma treatment on the surface of the substrate (a plasma surface treatment machine (Zeptone, diener) can be adopted, and the operation flow comprises the steps of placing a sample into a vacuum cavity, covering a cavity cover to vacuumize the cavity, introducing oxygen, opening a plasma generator for two minutes, finally introducing air, and taking out the sample) for 2-3 minutes;
fourthly, placing the strain resistor sheet on the surface of the base material, heating the alloy to 50 ℃ by using a heat source (such as a hot air blower, etc.), melting the strain resistor, coating a layer of film with the thickness of 0.1 mm-0.3 mm on the base material by using the melted strain resistor,
and fifthly, spin-coating a protective layer with the thickness of 1-3 mm on the surface of the film.
And step four, adsorbing the substrate on the surface of a spin coating table, placing a strain resistor sheet on the surface of the substrate, heating the alloy to 50 ℃ by using a hot air gun, melting the strain resistor, and coating a film with the thickness of 0.1mm on the substrate by using the melted strain resistor.
And fifthly, coating and curing the protective layer by using the Ecoflex-A and Ecoflex-B solutions in the step 1.
The method for repairing the self-repairable high-sensitivity flexible strain sensor comprises the following steps of firstly, applying current to two ends of the sensor, generating larger Joule heat in the sensor, enabling the strain resistance to reach a melting point and melting, and repairing cracks at the moment; specifically, an indium-bismuth-tin alloy may be used, and the melting point thereof is 47 °.
And step two, after the temperature is reduced to the room temperature, the strain resistance layer is restored to an initial state, so that the self-repairing process of the flexible strain sensor is realized.
The initial current applied was 100mA.
It should be noted that Ecoflex, namely platinum silica gel, is purchased from Smooth-On, U.S.A., and is a commonly used flexible material, which is prepared by mixing liquid Ecoflex-A and liquid Ecoflex-B according to the following formula 1: 1. and (3) mixing, and curing the mixture into a solid flexible material after heating.
Due to the existence of the double channels, the sensor is ensured to keep a passage under high strain, and high detection precision and wide detection range are realized. However, the cracks generated at this time are irreversible, and when the number of stretching times increases, the accuracy and reliability of the sensor may be significantly reduced. To repair the sensor to restore its original performance, a 100mA current was applied across the sensor, according to joule heating formula q=i 2 Rt, wherein I is a constant current value, R is a sensor resistance value, t is a power-on time, larger Joule heat can be generated in the sensor, the low-temperature alloy reaches a melting point and is melted, at the moment, cracks are repaired, and after the temperature is reduced to room temperature, the low-temperature alloy layer is recoveredAnd returning to the initial state, thereby realizing the self-repairing process of the flexible strain sensor, wherein the self-repairing process is shown in fig. 1.
The relationship between the tensile and resistivity rates of the flexible strain sensor is shown in fig. 3 a. Where ε is the applied strain, ΔR is the resistance change value, and R0 is the initial resistance value. Under the stretching condition, the low-temperature alloy layer can generate cracks, so that a circuit forms a double channel between the alloy layer and the bottom substrate layer, and the resistance is rapidly increased, thereby improving the detection sensitivity. The maximum strain limit of the sensor can reach 150%, and a small strain of 0.5% can be detected.
The embodiments described with reference to the drawings are exemplary and intended to be illustrative of the invention and should not be construed as limiting the invention. The examples should not be construed as limiting the invention, but any modifications based on the spirit of the invention should be within the scope of the invention.
Claims (3)
1. A preparation method of a self-repairable high-sensitivity flexible strain sensor is characterized by comprising the following steps of: the self-repairable high-sensitivity flexible strain sensor comprises a substrate (1) and a strain resistor (2); the melting point of the strain resistor is lower than the melting point of the substrate; the resistance of the strain resistor is smaller than that of the base material in an initial state, and the resistance of the strain resistor after stretching is larger than that of the base material;
and comprises the following preparation steps:
firstly, mixing Ecoflex-A and Ecoflex-B solutions according to a volume of 1:1, and mixing the mixed solutions with graphene according to a mass of 1: fully mixing and stirring the materials according to the proportion of 0.13, and standing the materials at room temperature for a period of time to remove bubbles;
casting the mixed solution into a manufactured mould, placing the mould into an oven at 60-70 ℃ and heating for 110-130 min,
step three, separating the substrate from the die, and carrying out plasma treatment on the surface of the substrate for 2-3 min;
fourthly, placing the strain resistor sheet on the surface of the base material, heating the alloy to 50 ℃ by using a heat source, melting the strain resistor, coating a layer of film with the thickness of 0.1mm to 0.3mm on the base material by using the melted strain resistor,
and fifthly, spin-coating a protective layer with the thickness of 1-3 mm on the surface of the film.
2. The method for manufacturing a self-healing high-sensitivity flexible strain sensor according to claim 1, wherein the method comprises the following steps: and step four, adsorbing the substrate on the surface of a spin coating table, placing a strain resistor sheet on the surface of the substrate, heating the alloy to 50 ℃ by using a hot air gun, melting the strain resistor, and coating a film with the thickness of 0.1mm on the substrate by using the melted strain resistor.
3. The method for manufacturing a self-healing high-sensitivity flexible strain sensor according to claim 2, wherein: and fifthly, coating and curing the protective layer by using the Ecoflex-A and Ecoflex-B solutions in the step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210401913.9A CN114935304B (en) | 2022-04-18 | 2022-04-18 | Self-repairable high-sensitivity flexible strain sensor and preparation method and repair method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210401913.9A CN114935304B (en) | 2022-04-18 | 2022-04-18 | Self-repairable high-sensitivity flexible strain sensor and preparation method and repair method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114935304A CN114935304A (en) | 2022-08-23 |
| CN114935304B true CN114935304B (en) | 2023-08-15 |
Family
ID=82861823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210401913.9A Active CN114935304B (en) | 2022-04-18 | 2022-04-18 | Self-repairable high-sensitivity flexible strain sensor and preparation method and repair method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114935304B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU815479A1 (en) * | 1979-03-16 | 1981-03-23 | Научно-Исследовательский Конструкторскийинститут Испытательных Машин,Приборов И Средств Ихмерений Macc | Method of manufacturing metal-based foil strain gauges |
| SU993009A1 (en) * | 1981-09-29 | 1983-01-30 | Научно-Исследовательский И Конструкторский Институт Испытательных Машин, Приборов И Средств Измерения Масс | Foil resistance strain gauge manufacturing method |
| JP2006226751A (en) * | 2005-02-16 | 2006-08-31 | Matsushita Electric Ind Co Ltd | Strain sensor and its manufacturing method |
| CN102221325A (en) * | 2010-04-13 | 2011-10-19 | 精量电子（深圳）有限公司 | Method and equipment for separating foil gauge |
| CN103047927A (en) * | 2012-12-18 | 2013-04-17 | 无锡莱顿电子有限公司 | Piezoresistive strain gauge with ceramic substrate |
| JP2017201235A (en) * | 2016-05-02 | 2017-11-09 | 地方独立行政法人大阪府立産業技術総合研究所 | Strain-resistive thin film and sensor using the strain-resistive thin film |
| CN108668431A (en) * | 2017-03-28 | 2018-10-16 | 国家纳米科学中心 | The preparation method and purposes of flexible extensible conducting wire and circuit |
| CN109163739A (en) * | 2018-08-20 | 2019-01-08 | 河南工业大学 | A method of preparing magneto-optic glass base single layer magnetic phasmon Terahertz sense film |
| CN110416356A (en) * | 2019-07-10 | 2019-11-05 | 西安交通大学 | A kind of preparation method of antimony selenide thin-film solar cells |
| CN110953982A (en) * | 2019-12-20 | 2020-04-03 | 浙江清华柔性电子技术研究院 | Thin film device and preparation method thereof, flexible strain sensor and preparation method thereof |
-
2022
- 2022-04-18 CN CN202210401913.9A patent/CN114935304B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU815479A1 (en) * | 1979-03-16 | 1981-03-23 | Научно-Исследовательский Конструкторскийинститут Испытательных Машин,Приборов И Средств Ихмерений Macc | Method of manufacturing metal-based foil strain gauges |
| SU993009A1 (en) * | 1981-09-29 | 1983-01-30 | Научно-Исследовательский И Конструкторский Институт Испытательных Машин, Приборов И Средств Измерения Масс | Foil resistance strain gauge manufacturing method |
| JP2006226751A (en) * | 2005-02-16 | 2006-08-31 | Matsushita Electric Ind Co Ltd | Strain sensor and its manufacturing method |
| CN102221325A (en) * | 2010-04-13 | 2011-10-19 | 精量电子（深圳）有限公司 | Method and equipment for separating foil gauge |
| CN103047927A (en) * | 2012-12-18 | 2013-04-17 | 无锡莱顿电子有限公司 | Piezoresistive strain gauge with ceramic substrate |
| JP2017201235A (en) * | 2016-05-02 | 2017-11-09 | 地方独立行政法人大阪府立産業技術総合研究所 | Strain-resistive thin film and sensor using the strain-resistive thin film |
| CN108668431A (en) * | 2017-03-28 | 2018-10-16 | 国家纳米科学中心 | The preparation method and purposes of flexible extensible conducting wire and circuit |
| CN109163739A (en) * | 2018-08-20 | 2019-01-08 | 河南工业大学 | A method of preparing magneto-optic glass base single layer magnetic phasmon Terahertz sense film |
| CN110416356A (en) * | 2019-07-10 | 2019-11-05 | 西安交通大学 | A kind of preparation method of antimony selenide thin-film solar cells |
| CN110953982A (en) * | 2019-12-20 | 2020-04-03 | 浙江清华柔性电子技术研究院 | Thin film device and preparation method thereof, flexible strain sensor and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114935304A (en) | 2022-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106482628B (en) | A kind of large deformation flexible strain transducer and preparation method thereof | |
| CN108050926B (en) | Strain sensor with high sensitivity and large strain response and preparation method thereof | |
| Yu et al. | Carbon Dots‐Based Ultrastretchable and Conductive Hydrogels for High‐Performance Tactile Sensors and Self‐Powered Electronic Skin | |
| CN110174195A (en) | A kind of Bionic flexible pressure sensor | |
| CN105037763A (en) | Preparing method for modified graphene oxide-piezoelectric polymer energy-storing thin-film device | |
| CN109852281A (en) | A kind of preparation method of the anisotropy conductiving glue based on liquid metal | |
| Chen et al. | Self-healing and stretchable conductor based on embedded liquid metal patterns within imprintable dynamic covalent elastomer | |
| CN107527675A (en) | A kind of flexible conducting film and preparation method thereof | |
| CN110527468B (en) | Preparation and application of force-induced conductive adhesive based on one-dimensional and two-dimensional materials | |
| CN113720255A (en) | Amorphous carbon-based flexible sensor based on crack fold structure and preparation method thereof | |
| CN110702248A (en) | Thermoelectric sensor based on graphene material and preparation method thereof | |
| CN114935304B (en) | Self-repairable high-sensitivity flexible strain sensor and preparation method and repair method thereof | |
| CN110190180B (en) | Piezoelectric touch control film and piezoelectric touch control display panel comprising same | |
| CN111627613A (en) | Preparation method of silver nanowire flexible transparent conductive film based on phenoxy resin | |
| Shar et al. | 3D Printable One‐Part Carbon Nanotube‐Elastomer Ink for Health Monitoring Applications | |
| CN108663154B (en) | Flexible wearable air pressure sensor, preparation method and application thereof | |
| He et al. | Thermally Drawn Super‐Elastic Multifunctional Fiber Sensor for Human Movement Monitoring and Joule Heating | |
| CN110798918A (en) | Washable flexible graphene low-voltage electrothermal film and preparation method thereof | |
| CN105400119A (en) | Electroshape memory composite material, preparation method and applications | |
| TWI714935B (en) | A conductive heating material with self-limiting and regulating characteristics and a flexible conductive heating element using the conductive heating material | |
| CN107478361B (en) | Microstructured pressure-sensitive sensor and preparation method thereof | |
| CN117249752A (en) | Flexible strain sensor based on bionic microstructure and preparation method thereof | |
| CN114199424A (en) | Piezoresistive sensor and preparation process thereof | |
| CN105910737B (en) | A kind of stress alignment sensor and preparation method thereof, stress localization method | |
| Hu et al. | A printable and flexible conductive polymer composite with sandwich structure for stretchable conductor and strain sensor applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |