CN106546161B - Elastic wearable strain sensor and preparation method thereof - Google Patents
Elastic wearable strain sensor and preparation method thereof Download PDFInfo
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- CN106546161B CN106546161B CN201610905595.4A CN201610905595A CN106546161B CN 106546161 B CN106546161 B CN 106546161B CN 201610905595 A CN201610905595 A CN 201610905595A CN 106546161 B CN106546161 B CN 106546161B
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1107—Measuring contraction of parts of the body, e.g. organ, muscle
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
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Abstract
The invention provides an elastic wearable strain sensor and a preparation method thereof, wherein the sensor mainly comprises the following components: the preparation method comprises the following steps of: (1) coating a conductive powder on a surface of the semi-cured elastic substrate; (2) solidifying the semi-solidified elastic substrate with the conductive powder adhered on the surface; (3) electrodes are respectively led out of two ends of the conductive powder layer to form the elastic wearable strain sensor. Compared with other sensors, the sensor has the characteristics of rapid large-area preparation, low cost, good product performance, simple and convenient operation and the like. The elastic wearable strain sensor can detect strain up to 150%, and has the advantages of high sensitivity, quick response and the like. The elastic wearable strain sensor can be attached to the skin surface of a human body and used for detecting muscle movement, and can also be fixed at joints such as fingers and knees for detecting bending strain.
Description
Technical Field
The invention belongs to the field of sensors, and particularly relates to an elastic wearable strain sensor and a preparation method thereof.
Background
A wearable device is a computing device that can be mounted on people, animals, and articles and can sense, transfer, and process information, and a sensor is a core device of the wearable device. The sensor has wearable performance and has important strain prospects in the fields of intelligent transportation, consumer electronics, medical appliances, intelligent home furnishing, industrial control, aviation and military industry and the like. The strain sensor is a sensor which can be used for detecting the deformation of an object caused by external force or self-driving. With the continuous development of science and technology, the continuous improvement of the material condition of people, the demand of electronic devices of flexible sensors is more and more increased. Wearable devices on the market at present are all five-door, from intelligent glasses to intelligent watches, from intelligent clothes to intelligent shoes, from golf gloves to boxing gloves, but have close relation with sensors. For example, in the field of consumer electronics, wearable sensors can be conveniently worn on a person's wrist for monitoring limb movements; in the intelligent home field, the wearable sensor can feed back whether an object is in an ideal state or not by monitoring the deformation of furniture.
As the strain of human finger joints and other parts reaches more than 50%, the traditional strain sensor is generally fixed on a hard substrate and cannot meet the requirements of wearing and strain monitoring at the same time. The strain sensor with ultrahigh flexibility and elasticity plays an important role in the fields of human health monitoring, high-sensitivity robot sensors, intelligent surgical gloves and the like. Some progress has been made in flexible or stretchable strain sensors, and wearable strain sensors with large strain amount have been realized (Advanced Materials, 2014, 26, 2022-. However, the manufacturing method of these strain sensors is either complicated or the production cycle is long. The current method with the characteristics of simple production process, short production period and the like is still a great challenge when used for manufacturing the elastic wearable strain sensor.
Disclosure of Invention
In order to solve the above problems, the present invention provides an elastic wearable strain sensor and a method for manufacturing the same, the sensor including:
further, the preparation method comprises the following steps:
step 1: coating a conductive powder on a surface of the semi-cured elastic substrate;
step 2: curing the semi-cured elastic substrate with the conductive powder adhered on the surface obtained in the step (1);
and step 3: electrodes are respectively led out from two ends of the conductive powder layer through a conductive adhesive tape to form an elastic wearable strain sensor;
further, the step 1 specifically comprises:
1-1) stirring and mixing liquid dimethyl siloxane and a curing agent according to the mass ratio of 8:1-12: 1;
1-2) pouring 0.5-50 g of the mixture obtained in the step 1-1) into a rectangular box with a flat bottom surface and a width-length ratio of 1:1-20: 1;
1-3) placing the rectangular box containing the mixture obtained in the step 1-1) and obtained in the step 1-2) into an oven for treatment, wherein the treatment temperature is 40-55 ℃, and the treatment time is 30-60 minutes; the incompletely cured polydimethylsiloxane obtained by this treatment, i.e. the semi-cured elastomeric substrate coated with the electrically conductive powder;
further, the elastic substrate in step 1 is not fully cured;
further, the step 2 specifically includes:
2-1) taking out the rectangular box filled with the incompletely cured polydimethylsiloxane obtained in the step 1-3), adding 0.1-5 g of graphite powder to the surface of the incompletely cured polydimethylsiloxane obtained in the step 1-3), completely coating the graphite powder on the surface of the incompletely cured polydimethylsiloxane by using a scraping blade, and recovering redundant graphite powder;
2-2) placing the incompletely cured polydimethylsiloxane surface rectangular box with the graphite powder coated on the surface obtained in the step 2-1) into an oven for treatment, wherein the treatment temperature is 55-65 ℃, and the treatment time is 20-45 minutes;
2-3) taking the polydimethylsiloxane obtained in the step 2-2) and with the graphite powder adhered to the surface out of the rectangular box;
further, the surface of the incompletely cured elastic substrate has tackiness, and conductive powder can be adhered;
further, the step 3 specifically includes:
3-1) using a 0.2-1 cm conductive aluminum adhesive tape to surround a circle at two ends of the polydimethylsiloxane with graphite powder adhered on the surface obtained by 2-3) so as to lead out electrodes, thus forming an elastic wearable strain sensor;
3-2) fixing the sensor obtained in the step 3-1) at the finger joint by using a double-sided adhesive tape, namely, the sensor can be used for detecting the bending of the finger;
further, an elastic wearable strain sensor comprises an elastic base, conductive powder arranged on the elastic base and electric conductors arranged at two ends of the conductive film for conducting electricity;
further, the elastomeric substrate comprises an elastomeric polydimethylsiloxane;
further, the conductive powder can be prepared from graphite powder, conductive carbon black powder, silver powder, copper powder, iron powder and aluminum powder;
further, the conductive powder is adhered to the elastic substrate by adhesion;
the invention has the following beneficial effects:
1) compared with other sensors, the elastic wearable strain sensor has the characteristics of rapid large-area preparation, low cost, good product performance, simple and convenient operation and the like;
2) the elastic wearable strain sensor can detect strain up to 150%, and has the advantages of high sensitivity, quick response and the like;
3) the main principle of the elastic wearable sensor is that the conductive layer generates micro-cracks due to stretching of the device, the generation of the micro-cracks changes the resistance of the sensor, and the change of the resistance can be used for reflecting the magnitude of strain;
4) the elastic wearable strain sensor can be attached to the skin surface of a human body and used for detecting muscle movement, and can also be fixed at joints such as fingers and knees for detecting bending strain;
5) the strain sensor has wide application prospect in the fields of human body motion detection, intelligent medical service and the like.
Drawings
FIG. 1 is a front view of a sensor according to the present invention;
FIG. 2 is a left side view of the sensor of the present invention;
fig. 3 is a top view of a sensor according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting. The following are preferred examples of the present invention:
fig. 1 to 3 show three views of the sensor according to the present invention, and the present invention provides a method for manufacturing an elastic wearable strain sensor, the method comprising:
step 1: coating a conductive powder on a surface of the semi-cured elastic substrate;
step 2: curing the semi-cured elastic substrate with the conductive powder adhered on the surface obtained in the step (1);
and step 3: electrodes are respectively led out from two ends of the conductive powder layer through the conductive adhesive tape, and the elastic wearable strain sensor is formed.
The step 1 specifically comprises the following steps:
1-1) stirring and mixing liquid dimethyl siloxane and a curing agent according to the mass ratio of 8:1-12: 1;
1-2) pouring 0.5-50 g of the mixture obtained in the step 1-1) into a rectangular box with a flat bottom surface and a width-length ratio of 1:1-20: 1;
1-3) placing the rectangular box containing the mixture obtained in the step 1-1) and obtained in the step 1-2) into an oven for treatment, wherein the treatment temperature is 40-55 ℃, and the treatment time is 30-60 minutes; the incompletely cured polydimethylsiloxane, i.e., the semi-cured elastomeric substrate coated with the conductive powder, which is obtained through the process is incompletely cured in the step 1.
The step 2 specifically comprises the following steps:
2-1) taking out the rectangular box filled with the incompletely cured polydimethylsiloxane obtained in the step 1-3), adding 0.1-5 g of graphite powder to the surface of the incompletely cured polydimethylsiloxane obtained in the step 1-3), completely coating the graphite powder on the surface of the incompletely cured polydimethylsiloxane by using a scraping blade, and recovering redundant graphite powder;
2-2) placing the incompletely cured polydimethylsiloxane surface rectangular box with the graphite powder coated on the surface obtained in the step 2-1) into an oven for treatment, wherein the treatment temperature is 55-65 ℃, and the treatment time is 20-45 minutes;
2-3) taking the polydimethylsiloxane with the graphite powder adhered on the surface obtained by the step 2-2) out of the rectangular box, wherein the surface of the incompletely cured elastic substrate has viscosity and can be adhered with conductive powder.
The step 3 specifically comprises the following steps:
3-1) using a 0.2-1 cm conductive aluminum adhesive tape to surround a circle at two ends of the polydimethylsiloxane with graphite powder adhered on the surface obtained by 2-3) so as to lead out electrodes, thus forming an elastic wearable strain sensor;
3-2) fixing the sensor obtained in the step 3-1) at the finger joint by using a double-sided adhesive tape, and detecting the bending of the finger.
The elastic wearable strain sensor comprises an elastic base, conductive powder arranged on the elastic base and electric conductors arranged at two ends of the conductive film and used for conducting electricity, wherein the elastic base comprises elastic polydimethylsiloxane, the conductive powder can be prepared from graphite powder, conductive carbon black powder, silver powder, copper powder, iron powder and aluminum powder, and the conductive powder is adhered to the elastic base through adhesion.
Example 1:
(1) stirring and mixing liquid dimethyl siloxane and a curing agent in a mass ratio of 10: 1;
(2) pouring 3 g of the mixture obtained in the step (1) into a rectangular box with a flat bottom surface and a width of 1 cm and a length of 5 cm;
(3) placing the rectangular box filled with the mixture obtained in the step (1) and obtained in the step (2) into an oven for treatment, wherein the treatment temperature is 50 ℃, and the treatment time is 50 minutes; incompletely cured polydimethylsiloxane obtained by the treatment;
(4) taking out the rectangular box filled with the incompletely cured polydimethylsiloxane obtained in the step (3), adding 1 g of graphite powder to the surface of the incompletely cured polydimethylsiloxane obtained in the step (3), completely coating the graphite powder on the surface of the incompletely cured polydimethylsiloxane by using a scraper, and recovering redundant graphite powder;
(5) placing the incompletely cured polydimethylsiloxane surface rectangular box with the graphite powder coated on the surface, which is obtained in the step (4), into an oven for processing, wherein the processing temperature is 58 ℃ and the processing time is 30 minutes;
(6) taking the polydimethylsiloxane with the graphite powder adhered to the surface obtained in the step (5) out of the rectangular box;
(7) encircling the two ends of the polydimethylsiloxane with graphite powder adhered to the surface obtained in the step (6) by using a 0.6 cm conductive aluminum adhesive tape for a circle so as to lead out electrodes, thus forming the elastic wearable strain sensor;
(8) and (4) fixing the sensor obtained in the step (7) at the finger joint by using a double-sided adhesive tape, and detecting the bending of the finger.
Example 2:
(1) stirring and mixing liquid dimethyl siloxane and a curing agent in a mass ratio of 9: 1;
(2) pouring 3 g of the mixture obtained in the step (1) into a rectangular box with a flat bottom surface, the width of the rectangular box is 0.8 cm, and the length of the rectangular box is 7 cm;
(3) putting the rectangular box filled with the mixture obtained in the step (1) and obtained in the step (2) into an oven for processing, wherein the processing temperature is 48 ℃, and the processing time is 60 minutes; incompletely cured polydimethylsiloxane obtained by the treatment;
(4) taking out the rectangular box filled with the incompletely cured polydimethylsiloxane obtained in the step (3), adding 2 g of copper powder to the surface of the incompletely cured polydimethylsiloxane obtained in the step (3), completely coating the copper powder on the surface of the incompletely cured polydimethylsiloxane by using a scraping blade, and recovering redundant silver powder;
(5) placing the incompletely cured polydimethylsiloxane surface rectangular box with the surface coated with the copper powder obtained in the step (4) into an oven for treatment, wherein the treatment temperature is 57 ℃, and the treatment time is 40 minutes;
(6) taking the polydimethylsiloxane with the copper powder adhered to the surface obtained in the step (5) out of the rectangular box;
(7) encircling the two ends of the polydimethylsiloxane with copper powder adhered on the surface obtained in the step (6) by using a 0.5 cm conductive aluminum adhesive tape for a circle so as to lead out electrodes, thus forming the elastic wearable strain sensor;
(8) and (4) fixing the sensor obtained in the step (7) on the arm skin by using a double-sided adhesive tape, and detecting the movement of arm muscles.
Example 3:
(1) stirring and mixing liquid dimethyl siloxane and a curing agent in a mass ratio of 11: 1;
(2) pouring 5 g of the mixture obtained in the step (1) into a rectangular box with a flat bottom surface and a width of 2 cm and a length of 12 cm;
(3) putting the rectangular box filled with the mixture obtained in the step (1) and obtained in the step (2) into an oven for processing, wherein the processing temperature is 52 ℃, and the processing time is 45 minutes; incompletely cured polydimethylsiloxane obtained by the treatment;
(4) taking out the rectangular box filled with the incompletely cured polydimethylsiloxane obtained in the step (3), adding 3 g of aluminum powder to the surface of the incompletely cured polydimethylsiloxane obtained in the step (3), completely coating the aluminum powder on the surface of the incompletely cured polydimethylsiloxane by using a scraping blade, and recovering redundant aluminum powder;
(5) placing the incompletely cured polydimethylsiloxane surface rectangular box with the surface coated with the aluminum powder obtained in the step (4) into an oven for treatment, wherein the treatment temperature is 60 ℃, and the treatment time is 30 minutes;
(6) taking the polydimethylsiloxane with the aluminum powder adhered to the surface obtained in the step (5) out of the rectangular box;
(7) encircling the two ends of the polydimethylsiloxane with the aluminum powder adhered to the surface obtained in the step (6) by using a 1 cm conductive aluminum adhesive tape for a circle, so as to lead out an electrode, namely forming the elastic wearable strain sensor;
(8) and (4) fixing the sensor obtained in the step (7) on the knee by using double-sided adhesive tape, and detecting the bending movement of the knee during running.
The above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. A preparation method of an elastic wearable strain sensor is characterized by comprising the following steps:
step 1: coating conductive powder on the surface of the semi-cured elastic substrate;
step 2: curing the semi-cured elastic substrate with the conductive powder adhered on the surface obtained in the step (1);
and step 3: electrodes are respectively led out of two ends of the conductive powder layer through conductive adhesive tapes to form an elastic wearable strain sensor, the elastic wearable strain sensor can detect strain up to 150%, and the step 1 specifically comprises the following steps:
1-1) stirring and mixing liquid dimethyl siloxane and a curing agent according to the mass ratio of 8:1-12: 1;
1-2) pouring 0.5-50 g of the mixture obtained in the step 1-1) into a rectangular box with a flat bottom surface and a width-length ratio of 1:1-20: 1;
1-3) placing the rectangular box containing the mixture obtained in the step 1-1) and obtained in the step 1-2) into an oven for treatment, wherein the treatment temperature is 40-55 ℃, and the treatment time is 30-60 minutes; the incompletely cured polydimethylsiloxane obtained by this treatment, i.e. the semi-cured elastomeric substrate coated with the electrically conductive powder.
2. The preparation method according to claim 1, wherein the step 2 is specifically:
2-1) taking out the rectangular box filled with the incompletely cured polydimethylsiloxane obtained in the step 1-3), adding 0.1-5 g of graphite powder to the surface of the incompletely cured polydimethylsiloxane obtained in the step 1-3), completely coating the graphite powder on the surface of the incompletely cured polydimethylsiloxane by using a scraping blade, and recovering redundant graphite powder;
2-2) placing the incompletely cured polydimethylsiloxane surface rectangular box with the graphite powder coated on the surface obtained in the step 2-1) into an oven for treatment, wherein the treatment temperature is 55-65 ℃, and the treatment time is 20-45 minutes;
2-3) taking the polydimethylsiloxane obtained in the step 2-2) and with the graphite powder adhered to the surface out of the rectangular box.
3. The method according to claim 2, wherein the surface of the semi-cured elastic substrate has tackiness to allow adhesion of conductive powder.
4. The preparation method according to claim 3, wherein the step 3 is specifically:
3-1) using a 0.2-1 cm conductive aluminum adhesive tape to surround a circle at two ends of the polydimethylsiloxane with graphite powder adhered on the surface obtained by 2-3) so as to lead out electrodes, thus forming an elastic wearable strain sensor;
3-2) fixing the sensor obtained in the step 3-1) at the finger joint by using a double-sided adhesive tape, and detecting the bending of the finger.
5. An elastic wearable strain sensor based on the manufacturing method of any one of claims 1 to 4, wherein the sensor comprises a semi-cured elastic substrate, a conductive powder disposed on the semi-cured elastic substrate, and a conductive body disposed at two ends of the semi-cured elastic substrate for conducting electricity.
6. The elastic wearable strain sensor of claim 5, wherein the semi-cured elastic substrate comprises elastic polydimethylsiloxane.
7. The elastic wearable strain sensor of claim 6, wherein the conductive powder is made of graphite powder, conductive carbon black powder, silver powder, copper powder, iron powder, or aluminum powder.
8. The elastic wearable strain sensor of claim 7, wherein the conductive powder is adhered to the semi-cured elastic substrate by adhesion.
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| KR101877171B1 (en) * | 2017-04-13 | 2018-08-07 | 숭실대학교산학협력단 | Clothing type wearable device for measuring muscle activity and Method for manufacturing the same |
| CN108917582A (en) * | 2018-03-30 | 2018-11-30 | 华东理工大学 | Strain transducer and its manufacturing method |
| CN108716885B (en) * | 2018-06-13 | 2020-04-10 | 苏州大学 | Flexible strain sensor and preparation method and application thereof |
| CN109171743A (en) * | 2018-08-15 | 2019-01-11 | 广东工业大学 | A kind of muscle deformation signal acquisition device and its processing method |
| CN110006334B (en) * | 2019-04-26 | 2021-07-09 | 华东理工大学 | Flexible strain sensor based on laser direct-writing shaddock peel and preparation method thereof |
| CN111820902B (en) * | 2020-06-29 | 2021-07-09 | 北京科技大学 | Ankle joint ligament injury intelligent decision-making system based on activity degree characteristics |
| CN113418552B (en) * | 2021-06-09 | 2022-10-04 | 海南大学 | Two-dimensional transition metal sulfide material flexible sensor and preparation method thereof |
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| CN103225204A (en) * | 2013-03-22 | 2013-07-31 | 电子科技大学 | Wearable flexible sensor and making method thereof |
| CN105115414A (en) * | 2015-09-09 | 2015-12-02 | 北京科技大学 | Environmentally-friendly wearable strain sensor and preparation method thereof |
| CN105783697A (en) * | 2016-05-18 | 2016-07-20 | 郑州大学 | Flexible strain sensor with crack structure and preparation method thereof |
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| FR1317798A (en) * | 1961-03-17 | 1963-05-08 | ||
| CN103225204A (en) * | 2013-03-22 | 2013-07-31 | 电子科技大学 | Wearable flexible sensor and making method thereof |
| CN105115414A (en) * | 2015-09-09 | 2015-12-02 | 北京科技大学 | Environmentally-friendly wearable strain sensor and preparation method thereof |
| CN105783697A (en) * | 2016-05-18 | 2016-07-20 | 郑州大学 | Flexible strain sensor with crack structure and preparation method thereof |
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