CN111504490A - Flexible thermal resistance temperature sensor and preparation and application thereof - Google Patents
Flexible thermal resistance temperature sensor and preparation and application thereof Download PDFInfo
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- CN111504490A CN111504490A CN202010237712.0A CN202010237712A CN111504490A CN 111504490 A CN111504490 A CN 111504490A CN 202010237712 A CN202010237712 A CN 202010237712A CN 111504490 A CN111504490 A CN 111504490A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
Abstract
The invention relates to a flexible thermal resistance temperature sensor and preparation and application thereof. And assembling the flexible thermosensitive film on the flexible substrate, and assembling a pair of electrodes on the flexible thermosensitive film to be used as a data output end. The temperature sensor prepared by the invention has the advantages of simple and reliable structure, good flexibility and low cost, and has important scientific value in the aspect of intelligent clothing.
Description
Technical Field
The invention belongs to the field of temperature measuring materials and preparation and application thereof, and particularly relates to a flexible thermal resistance temperature sensor and preparation and application thereof.
Background
The temperature sensor is classified into a thermistor type and a thermocouple type according to the characteristics of the electronic component. The thermal resistance temperature sensor is made of a conductor or a semiconductor, and the resistance changes along with the change of temperature during temperature measurement. The temperature sensor measures temperature according to the principle.
Thermal resistance temperature sensor
In the scientific age, flexible wearable devices have become one of the key words for development. The flexible wearable device needs to have good flexibility, and the device is small in size, light in weight and convenient to carry. Graphene, as a two-dimensional monoatomic layer material, has excellent flexibility, conductivity and mechanical properties, and is a preferred material for various nanosensors. The temperature sensor prepared from the graphene material can be well attached to various complex curved surfaces, and the size and the quality of the temperature sensor meet the requirements of wearable devices.
CN 108515713 a discloses a method for preparing a NTC powder and graphene composite planar thermosensitive film, which adopts a multilayer thermosensitive film, the toughness of the film is poor, and the film may slip or break between layers when bent, and the applicability of some complex curved surfaces needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a flexible thermal resistance temperature sensor and preparation and application thereof. The flexible wearable device has wider development prospect in the day when the flexible wearable device is concerned. According to the invention, the flexible graphene-carbon nanotube composite film is used as a thermosensitive material to prepare the flexible thermal resistance temperature sensor.
The invention discloses a flexible thermal resistance temperature sensor which comprises a flexible thermosensitive film, a flexible substrate and electrodes, wherein the flexible thermosensitive film is a graphene-carbon nano tube composite film, the flexible thermosensitive film is assembled on the flexible substrate, and a pair of electrodes is assembled at two ends of the flexible thermosensitive film.
The graphene-carbon nanotube composite film is prepared by the following method: and uniformly mixing the graphene oxide dispersion liquid and the carbon nano tube dispersion liquid, performing suction filtration to form a film, reducing, and drying to obtain the flexible thermosensitive film.
The graphene oxide dispersion liquid is prepared by dispersing graphite oxide in deionized water and performing ultrasonic treatment to obtain the graphene oxide dispersion liquid with the concentration of 1-3 mg/m L.
The carbon nanotube dispersion liquid is prepared by dispersing carbon nanotubes in deionized water, stirring and performing ultrasonic treatment to obtain L carbon nanotube dispersion liquid with the concentration of 1-3 mg/m, wherein the stirring time is 1-1.5 hours.
The concentration of the graphene oxide dispersion liquid and the concentration of the carbon nano tube dispersion liquid are both 1-3 mg/m L, and the mass ratio of the graphene oxide dispersion liquid to the carbon nano tube dispersion liquid is 5: 1.
The reduction and drying specifically comprises the following steps: placing the film obtained by suction filtration in a glass beaker, dropwise adding a hydrogen iodine acid solution, and reducing for 5min at room temperature; taking out and soaking in absolute ethyl alcohol for 24-30 h until the solution does not change color any more, and then drying at 60-80 ℃; the added hydriodic acid solution needs to submerge (cover) the composite film to better reduce the composite film.
The suction filtration film forming is as follows: the pressure of vacuum filtration is 0.06-0.1 MPa.
The flexible substrate is polyimide; the electrodes are conductive yarns.
The flexible thermosensitive film is of a snake-shaped structure, the total width is 14-16 mm, the total length is 10-12 mm, and the gap is 2-3 mm. The linear equation for the temperature and resistance of the sensor is-3.765T +1236.106, where R is the resistance and T is the temperature.
The invention relates to a preparation method of a flexible thermal resistance sensor, which comprises the steps of cutting and assembling a flexible thermosensitive film on a flexible substrate, welding conductive yarns at two ends of the flexible thermosensitive film by conductive silver paste to serve as data output ends, and thus obtaining the flexible thermal resistance sensor.
The invention relates to application of the flexible thermal resistance temperature sensor, such as intelligent clothing and the like.
Advantageous effects
(1) The flexible graphene-carbon nanotube composite film is used as a thermosensitive material, has good flexibility, and can effectively measure the temperature of a complex curved surface to be 20-100 ℃;
(2) the preparation and assembly of the invention are simple and easy to operate, complex equipment is not needed, and the cost is low;
(3) the method is simple and easy to operate, and the prepared thermal resistance temperature sensor has good flexibility, small volume and light weight;
(4) the sensor prepared by the invention has small volume and thin thickness, and has better attaching effect when being integrated on clothes; has important scientific value and wide application prospect in the fields of intelligent clothing and industry.
Drawings
FIG. 1 is a schematic structural view of a flexible thermal resistance temperature sensor prepared in example 1, in which a is a schematic structural view of a front surface of the sensor and b is a schematic structural view of a side surface of the sensor;
FIG. 2 is a scanning electron micrograph of graphene-carbon nanotubes of example 2, wherein a is a surface view of a thermosensitive thin film and b is a cross-sectional view of the thermosensitive thin film;
fig. 3 is a graph showing the relationship between the temperature and the resistance of the temperature sensor in example 3.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
Weighing 50mg of graphite oxide, dispersing in 20m L deionized water, carrying out ultrasonic treatment for 2h by using a cell crusher, weighing 10mg of carbon nanotubes, dispersing in 20m L deionized water, stirring for 1h, carrying out ultrasonic treatment for 2h by using the cell crusher, uniformly mixing the two dispersions, carrying out suction filtration under the pressure of 0.08Mpa to form a film, putting the composite film obtained by suction filtration in a glass beaker, dropwise adding 15m L hydriodic acid solution, reducing at the temperature of 25 ℃ for 5min, taking out and soaking in absolute ethyl alcohol for 30h until the solution does not change color any more, and then putting the reduced composite film in an oven at the temperature of 80 ℃ for drying to obtain the graphene-carbon nanotube flexible film.
The flexible thermosensitive film is cut into a snake-shaped structure with the total width of 14mm, the total length of 12mm and the gap of 2mm, the snake-shaped structure is assembled on the flexible substrate, and conductive yarns are welded at two ends of the flexible thermosensitive film by conductive silver paste to serve as data output ends.
As shown in fig. 1, a is a schematic structural diagram of a flexible thermal resistance temperature sensor, where a is a schematic structural diagram of a front side of the sensor, and b is a schematic structural diagram of a side of the sensor.
Example 2
Weighing 80mg of graphite oxide, dispersing in 40m L deionized water, carrying out ultrasonic treatment for 2.5h by using a cell crusher, weighing 16mg of carbon nanotubes, dispersing in 40m L deionized water, stirring for 1.5h, carrying out ultrasonic treatment for 2.5h by using the cell crusher, uniformly mixing the two dispersions, carrying out suction filtration under the pressure of 0.1Mpa to form a film, putting the composite film obtained by suction filtration in a glass beaker, dropwise adding 20m L hydriodic acid solution, reducing at the temperature of 25 ℃ for 5min, taking out, soaking in absolute ethyl alcohol for 30h until the solution does not change color any more, and then putting the reduced composite film in an oven at the temperature of 80 ℃ for drying to obtain the graphene-carbon nanotube flexible thermosensitive film.
The flexible heat-sensitive film is cut into a snake-shaped structure with the total width of 16mm, the total length of 10mm and the gap of 3mm, and the snake-shaped structure is assembled on a flexible substrate, and conductive yarns are welded at two ends of the flexible composite film by conductive silver paste to serve as data output ends.
As shown in fig. 2, a scanning electron microscope image of the graphene-carbon nanotube composite film; wherein a is a surface diagram and b is a cross-sectional diagram, and as can be seen from the diagram, the thermosensitive composite film has a three-dimensional network structure, and the graphene and the carbon nano tubes are connected with each other.
Example 3
Weighing 60mg of graphite oxide, dispersing in 60m L deionized water, carrying out ultrasonic treatment for 2h by using a cell crusher, weighing 12mg of carbon nanotubes, dispersing in 60m L deionized water, stirring for 1h, carrying out ultrasonic treatment for 2h by using the cell crusher, uniformly mixing the two dispersions, carrying out suction filtration under the pressure of 0.08Mpa to form a film, putting the composite film obtained by suction filtration in a glass beaker, dropwise adding 20m L hydriodic acid solution, reducing at the temperature of 25 ℃ for 5min, taking out and soaking in absolute ethyl alcohol for 28h until the solution does not change color any more, and then placing the reduced composite film in an oven at the temperature of 80 ℃ for drying to obtain the graphene-carbon nanotube flexible thermosensitive film.
The flexible thermosensitive film is cut into a snake-shaped structure with the total width of 15mm, the total length of 12mm and the gap of 2mm, the snake-shaped structure is assembled on a flexible substrate, and conductive yarns are welded at two ends of the flexible composite film by conductive silver paste to serve as data output ends.
As shown in fig. 3, the relationship between the temperature and the resistance of the temperature sensor is linear, and the linear equation is-3.765T +1236.106, where R is the resistance, T is the temperature, and the linear correlation coefficient is 0.993.
Claims (9)
1. The flexible thermal resistance temperature sensor is characterized by comprising a flexible thermal sensitive film, a flexible substrate and electrodes, wherein the flexible thermal sensitive film is a graphene-carbon nanotube composite film, the flexible thermal sensitive film is assembled on the flexible substrate, and a pair of electrodes is assembled at two ends of the flexible thermal sensitive film.
2. The sensor according to claim 1, wherein the graphene-carbon nanotube composite film is prepared by a method comprising: and uniformly mixing the graphene oxide dispersion liquid and the carbon nano tube dispersion liquid, performing suction filtration to form a film, reducing, and drying to obtain the flexible thermosensitive film.
3. The sensor according to claim 2, wherein the concentration of the graphene oxide dispersion liquid and the concentration of the carbon nanotube dispersion liquid are both 1-3 mg/m L, and the mass ratio of the graphene oxide dispersion liquid to the carbon nanotube dispersion liquid is 5: 1.
4. The sensor according to claim 2, wherein the reduction and drying are specifically: placing the film obtained by suction filtration in a glass beaker, dropwise adding a hydrogen iodine acid solution, and reducing for 5min at room temperature; taking out and soaking in absolute ethyl alcohol for 24-30 h until the solution does not change color any more, and then drying at 60-80 ℃.
5. The sensor of claim 1, wherein the flexible substrate is a polyimide film; the electrodes are conductive yarns.
6. The sensor according to claim 1, wherein the flexible heat-sensitive film has a serpentine structure, an overall width of 14 to 16mm, an overall length of 10 to 12mm, and a gap of 2 to 3 mm.
7. The sensor of claim 1, wherein the linear equation for temperature and resistance of the sensor is-3.765T +1236.106, where R is resistance and T is temperature.
8. A preparation method of a flexible thermal resistance sensor is characterized in that a flexible thermosensitive film is cut and assembled on a flexible substrate, conductive yarns are welded at two ends of the flexible thermosensitive film through conductive silver paste to serve as data output ends, and the flexible thermal resistance sensor is obtained.
9. Use of the flexible thermal resistance temperature sensor of claim 1.
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| CN202010237712.0A CN111504490A (en) | 2020-03-30 | 2020-03-30 | Flexible thermal resistance temperature sensor and preparation and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114152359A (en) * | 2020-09-08 | 2022-03-08 | 哈尔滨理工大学 | Flexible temperature sensor and preparation method thereof |
| CN114295247A (en) * | 2022-01-07 | 2022-04-08 | 华东师范大学 | Flexible temperature sensor, preparation method thereof and body temperature monitoring system |
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| CN109580027A (en) * | 2018-11-30 | 2019-04-05 | 北京印刷学院 | A kind of flexibility temperature sensor and preparation method |
| CN109632123A (en) * | 2018-12-07 | 2019-04-16 | 苏州长风航空电子有限公司 | A kind of flexible paste chip temperature sensor |
| CN110885075A (en) * | 2019-11-29 | 2020-03-17 | 重庆大学 | Conductive graphene composite film capable of enhancing toughness and strength and preparation method thereof |
| CN110907501A (en) * | 2019-12-10 | 2020-03-24 | 新余学院 | Flexible stretchable temperature/humidity sensor insensitive to strain and preparation method thereof |
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- 2020-03-30 CN CN202010237712.0A patent/CN111504490A/en active Pending
Patent Citations (4)
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| CN109580027A (en) * | 2018-11-30 | 2019-04-05 | 北京印刷学院 | A kind of flexibility temperature sensor and preparation method |
| CN109632123A (en) * | 2018-12-07 | 2019-04-16 | 苏州长风航空电子有限公司 | A kind of flexible paste chip temperature sensor |
| CN110885075A (en) * | 2019-11-29 | 2020-03-17 | 重庆大学 | Conductive graphene composite film capable of enhancing toughness and strength and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152359A (en) * | 2020-09-08 | 2022-03-08 | 哈尔滨理工大学 | Flexible temperature sensor and preparation method thereof |
| CN114295247A (en) * | 2022-01-07 | 2022-04-08 | 华东师范大学 | Flexible temperature sensor, preparation method thereof and body temperature monitoring system |
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Application publication date: 20200807 |