CN114295247A - Flexible temperature sensor, preparation method thereof and body temperature monitoring system - Google Patents
Flexible temperature sensor, preparation method thereof and body temperature monitoring system Download PDFInfo
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Abstract
The invention discloses a flexible temperature sensor, a preparation method thereof and a body temperature monitoring system. The flexible temperature sensor comprises a graphene/PDMS thermal sensitive material layer, a PDMS film packaging layer and a copper wire. The flexible temperature sensor adopts the serpentine graphene/PDMS thermal sensitive material, can quickly respond to body temperature change, improves the body temperature measurement efficiency, and effectively reduces the influence of strain signals generated by material stretching due to serpentine shape, thereby improving the accuracy of body temperature detection; simultaneously, PDMS film encapsulation can effectively laminate skin, when promoting the wearing travelling comfort, can reduce ambient temperature's influence. The body temperature monitoring system comprises a flexible temperature sensor, a system circuit and a mobile terminal application. The mobile terminal application can display the body temperature data in real time through graphs, curves and the like, so that the body temperature data can reflect the health condition of the user, and the user experience is greatly improved.
Description
Technical Field
The invention relates to the technical field of body temperature monitoring, in particular to a flexible temperature sensor, a preparation method and a body temperature monitoring system.
Background
The body temperature and the human health are closely related. Firstly, the body temperature is the external reflection of human metabolism, the basal metabolism is reduced by 6 to 7 percent when the body temperature is reduced by 1 ℃, and when the room temperature is reduced, the human body can generate more heat by improving the basal metabolism, thereby maintaining the body temperature. Therefore, whether the human metabolism is normal can be judged by the body temperature. However, the current body temperature measurement methods have many disadvantages, such as low efficiency, no skin contact, susceptibility of the temperature sensor to strain signals and ambient temperature, and so on.
Disclosure of Invention
The invention aims to provide a flexible temperature sensor, a preparation method and a body temperature monitoring system, which are used for reducing the influence of environmental temperature and strain signals on the temperature sensor and improving the body temperature measuring efficiency, accuracy and wearing comfort.
In order to achieve the purpose, the invention provides the following scheme:
a serpentine sandwich structured flexible temperature sensor comprising: graphene/PDMS (Polydimethylsiloxane) heat-sensitive material layer, PDMS film packaging layer and copper wire; the graphene/PDMS thermal sensitive material layer is snake-shaped; two sides of the graphene/PDMS thermal sensitive material layer are packaged through the PDMS film packaging layer; and two ends of the graphene/PDMS thermal sensitive material layer are led out through the copper wires.
Optionally, the graphene/PDMS thermal sensitive material layer is prepared from graphene and PDMS.
Optionally, the mass ratio of graphene to PDMS in the graphene/PDMS thermal sensitive material layer is 1: 9-1: 24.
Optionally, the thickness of the PDMS film encapsulation layer is 0.6mm to 1.2 mm.
The invention also provides a preparation method of the flexible temperature sensor with the snake-shaped sandwich structure, which comprises the following steps:
ultrasonically dispersing graphene through n-heptane, adding PDMS (polydimethylsiloxane) and fully stirring to obtain a graphene/PDMS suspension;
heating and stirring the graphene/PDMS suspension until the graphene/PDMS suspension is viscous, pouring the mixture into a snake-shaped mold, and putting the snake-shaped mold into a drying oven for heating and curing to obtain a snake-shaped graphene/PDMS heat-sensitive material layer;
and leading out two ends of the serpentine graphene/PDMS heat-sensitive material layer by using copper wires, and packaging two surfaces of the serpentine graphene/PDMS heat-sensitive material layer by using PDMS films to obtain the flexible temperature sensor.
Optionally, ultrasonically dispersing graphene through n-heptane, adding PDMS and fully stirring to obtain a graphene/PDMS suspension, specifically including:
weighing a preset amount of graphene, and adding n-heptane to form a graphene/n-heptane mixed solution;
placing the graphene/n-heptane mixed solution into an ultrasonic cleaner for ultrasonic dispersion to obtain a graphene/n-heptane dispersion solution;
mixing the glue A and the glue B of the SYLGARD 184 of the Dow Corning uniformly to obtain PDMS mixed liquor;
and mixing the PDMS mixed solution and the graphene/n-heptane dispersion liquid to obtain the graphene/PDMS suspension.
Optionally, the graphene/PDMS suspension is heated and stirred to be viscous, then poured into a serpentine mold, and placed into an oven for heating and curing, so as to obtain the serpentine graphene/PDMS thermal sensitive material layer, which specifically includes:
heating and stirring the graphene/PDMS suspension until the graphene/PDMS suspension is viscous, pouring the mixture into a snake-shaped mold, and putting the snake-shaped mold into a drying oven for heating and curing to obtain the snake-shaped graphene/PDMS heat-sensitive material layer; the mass ratio of graphene to PDMS in the graphene/PDMS heat-sensitive material layer is 1: 9-1: 24; the heating and stirring temperature is 50-70 ℃; the temperature of heating and curing is 60-100 ℃; the heating and curing time is 2.5-4 h.
Optionally, the two ends of the serpentine graphene/PDMS thermal sensitive material layer are led out by using copper wires, and two sides of the serpentine graphene/PDMS thermal sensitive material layer are packaged by using PDMS films, so as to obtain the flexible temperature sensor, which specifically includes:
mixing glue A and glue B of Dow Corning SYLGARD 184 to obtain PDMS mixed liquor;
pouring the PDMS mixed solution into a mold, and heating and curing to obtain a PDMS film packaging layer; the thickness of the PDMS film packaging layer is 0.6 mm-1.2 mm;
leading out two ends of the graphene/PDMS sensitive material layer by using copper wires, and attaching one surface of the graphene/PDMS sensitive material layer to the PDMS film packaging layer;
and coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer, and putting the mixture into an oven for heating and curing to obtain the flexible temperature sensor.
The invention also provides a body temperature monitoring system, comprising: the flexible temperature sensor, the system circuit and the mobile terminal application;
the flexible temperature sensor is connected with the system circuit through a copper wire; the mobile terminal application is wirelessly connected with the system circuit;
the flexible temperature sensor is used for acquiring a temperature signal and transmitting the temperature signal to the system circuit through the copper wire;
the system circuit is used for carrying out data processing on the temperature signal to obtain body temperature data and transmitting the body temperature data to the mobile terminal in a wireless mode for application;
the mobile end application visualizes the body temperature data.
Optionally, the system circuitry comprises: the Bluetooth module comprises a power module, a data reading and processing circuit module and a Bluetooth module; the data reading and processing circuit module is respectively connected with the power module and the Bluetooth module; the power supply module is connected with the Bluetooth module;
the power module is used for supplying power to the data reading and processing circuit module and the Bluetooth module;
the data reading and processing circuit module comprises a voltage division circuit and a data processing circuit; the voltage division circuit is used for reading the temperature signal in a voltage form and transmitting a voltage signal to the data processing circuit; the data processing circuit is used for amplifying, filtering and A/D converting the voltage signal to obtain the body temperature data and transmitting the body temperature data to the Bluetooth module;
the Bluetooth module is used for wirelessly transmitting the body temperature data to the mobile terminal application.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a flexible temperature sensor, a preparation method thereof and a body temperature monitoring system. Wherein flexible temperature sensor is snakelike sandwich structure, includes: the graphene/PDMS thermal sensitive material layer, the PDMS film packaging layer and the copper wire; the graphene/PDMS thermal sensitive material layer is snake-shaped; two sides of the graphene/PDMS thermal sensitive material layer are packaged through the PDMS film packaging layer; and two ends of the graphene/PDMS thermal sensitive material layer are led out through the copper wires. The flexible temperature sensor adopts the snake-shaped graphene/PDMS heat-sensitive material layer, can quickly respond to body temperature change, improves the body temperature measurement efficiency, effectively reduces the influence of strain signals generated by material stretching due to snake-shaped, and improves the accuracy of body temperature detection; simultaneously, PDMS film encapsulation layer can effectively laminate skin, when promoting the wearing travelling comfort, can reduce ambient temperature's influence. In addition, the flexible temperature sensor also has the characteristics of simple process and low cost.
According to the body temperature monitoring system based on the flexible temperature sensor with the snake-shaped sandwich structure, the body temperature data is acquired through the flexible temperature sensor, and real-time display is performed through the mobile terminal application, so that the real-time monitoring of the body temperature is realized, and the problems that the existing temperature measuring mode is low in efficiency, the temperature sensor is easily influenced by the ambient temperature and strain signals and the like are solved. The flexible temperature sensor based on the snake-shaped sandwich structure in the body temperature monitoring system can be attached to different parts to carry out long-time body temperature monitoring; the body temperature monitoring system mobile terminal application can display body temperature data in real time through graphs, curves and the like, so that the health condition of a user can be reflected by the body temperature data, and the user experience is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a discrete structure of a flexible temperature sensor with a serpentine sandwich structure according to the present invention;
FIG. 2 is a schematic structural view of a flexible temperature sensor product with a serpentine sandwich structure according to the present invention;
fig. 3 is a schematic structural diagram of a graphene/PDMS thermal sensitive material layer provided in the present invention;
FIG. 4 is a schematic structural diagram of a body temperature monitoring system according to the present invention;
description of the symbols:
1. the flexible temperature sensor comprises a flexible temperature sensor body, 101, a graphene/PDMS heat-sensitive material layer, 102, a PDMS film packaging layer, 103, a copper wire, 2, a system circuit, 201, a power module, 202, a data reading and processing circuit module, 203, a Bluetooth module, 3 and a mobile terminal application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a flexible temperature sensor, a preparation method and a body temperature monitoring system, which are used for reducing the influence of environmental temperature and strain signals on the temperature sensor and improving the body temperature measuring efficiency, accuracy and wearing comfort.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 1 is a schematic diagram of a discrete structure of a flexible temperature sensor with a serpentine sandwich structure according to the present invention; fig. 2 is a schematic structural diagram of a flexible temperature sensor product with a serpentine sandwich structure according to the present invention. Referring to fig. 1 and 2, the flexible temperature sensor 1 of the present invention has a serpentine sandwich structure, including: graphene/PDMS thermal sensitive material layer 101, PDMS film encapsulation layer 102, and copper wire 103. Two sides of the graphene/PDMS thermal sensitive material layer 101 are packaged by the PDMS film packaging layer 102, and two ends of the graphene/PDMS thermal sensitive material layer 101 are led out through the copper wires 103. In practical application, the thickness of the PDMS film encapsulation layer 102 is 0.6mm to 1.2 mm; preferably, the thickness of the PDMS thin film encapsulation layer 102 is 0.8 mm.
Fig. 3 is a schematic structural diagram of a graphene/PDMS thermal sensitive material layer provided in the present invention. As shown in fig. 3, the graphene/PDMS thermal sensitive material layer 101 has a serpentine shape; and the graphene/PDMS thermal sensitive material layer 101 is prepared from graphene and PDMS. In practical application, the mass ratio of graphene to PDMS in the graphene/PDMS thermal sensitive material layer 101 is 1: 9-1: 24; preferably, the mass ratio of graphene to PDMS is 1: 19.
The following is a detailed description of the method for manufacturing the flexible temperature sensor with the serpentine sandwich structure.
The invention discloses a preparation method of a flexible temperature sensor 1 with a snake-shaped sandwich structure, which comprises the following steps:
step (1): and ultrasonically dispersing graphene through n-heptane, adding polydimethylsiloxane PDMS (PDMS) and fully stirring to obtain the graphene/PDMS suspension.
According to the invention, graphene is ultrasonically dispersed through n-heptane, PDMS is added and fully stirred, and graphene/PDMS suspension is obtained. Firstly, weighing a certain amount of graphene, adding n-heptane, wherein the n-heptane just submerges the graphene, and placing the graphene/n-heptane mixed solution into an ultrasonic cleaner for ultrasonic dispersion for 2 hours to obtain the graphene/n-heptane dispersion liquid. PDMS adopted Dow Corning SYLGARD 184, and glue A and glue B of Dow Corning SYLGARD 184 were mixed according to a ratio of 10:1 to obtain PDMS mixed solution. And mixing the PDMS mixed solution and the graphene/n-heptane dispersion liquid to obtain the graphene/PDMS suspension. In the invention, the mass ratio of the graphene to the PDMS is preferably 1: 9-1: 24, and more preferably 1: 19.
Therefore, the step (1) specifically includes:
weighing a preset amount of graphene, and adding n-heptane to form a graphene/n-heptane mixed solution; placing the graphene/n-heptane mixed solution into an ultrasonic cleaner for ultrasonic dispersion to obtain a graphene/n-heptane dispersion solution; mixing the glue A and the glue B of the SYLGARD 184 for the Dow Corning uniformly to obtain a PDMS mixture; and mixing the PDMS mixed solution and the graphene/n-heptane dispersion liquid to obtain the graphene/PDMS suspension.
In practical application, the mass ratio of the glue A to the glue B of the SYLGARD 184 for the Dow Corning is 10: 1.
step (2): and heating and stirring the graphene/PDMS suspension until the graphene/PDMS suspension is viscous, pouring the mixture into a snake-shaped mold, and putting the snake-shaped mold into an oven for heating and curing to obtain the snake-shaped graphene/PDMS thermal sensitive material layer 101.
After the graphene/PDMS suspension is obtained, the graphene/PDMS suspension is heated and stirred to be viscous, poured into a snake-shaped mold, and placed into an oven for heating and curing, so that the snake-shaped graphene/PDMS thermal sensitive material layer 101 is obtained. In the present invention, the heating and stirring temperature is preferably 50 to 70 ℃, and more preferably 60 ℃. In the present invention, the heating curing temperature is preferably 60 ℃ to 100 ℃, and more preferably 80 ℃; the heating curing time is preferably 2.5h to 4h, and more preferably 3 h.
Therefore, the step (2) specifically includes:
and heating and stirring the graphene/PDMS suspension until the graphene/PDMS suspension is viscous, pouring the mixture into a snake-shaped mold, and putting the snake-shaped mold into an oven for heating and curing to obtain the snake-shaped graphene/PDMS thermal sensitive material layer 101. In practical application, the mass ratio of graphene to PDMS in the graphene/PDMS thermal sensitive material layer 101 is 1: 9-1: 24; preferably, the mass ratio of graphene to PDMS is 1: 19. In practical application, the heating and stirring temperature is 50-70 ℃; preferably, the temperature of the heating and stirring is 60 ℃. In practical application, the temperature of heating and curing is 60-100 ℃; preferably, the temperature for heat curing is 80 ℃. In practical application, the heating and curing time is 2.5-4 h; preferably, the time for heat curing is 3 h.
And (3): and leading out two ends of the serpentine graphene/PDMS heat-sensitive material layer 101 by using copper wires 103, and packaging two sides of the serpentine graphene/PDMS heat-sensitive material layer 101 by using PDMS film packaging layers 102 to obtain the flexible temperature sensor 1.
After the serpentine graphene/PDMS thermal sensitive material layer 101 is obtained, two ends of the serpentine graphene/PDMS thermal sensitive material layer 101 are led out by copper wires 103, and two sides are packaged by a PDMS film packaging layer 102, so that the flexible temperature sensor 1 is obtained. In the invention, the PDMS film encapsulation layer 102 is prepared by Dow Corning SYLGARD 184, and after mixing the glue A and the glue B to obtain a PDMS mixed solution, pouring the PDMS mixed solution into a mold to be heated and cured to obtain the PDMS film encapsulation layer 102. The mixing ratio of the glue A to the glue B is preferably 8-11: 1, and more preferably 10: 1; the mould is preferably a culture dish; the thickness of the PDMS film is preferably 0.6mm to 1.2mm, and more preferably 0.8 mm. After the PDMS film packaging layer 102 is obtained, two ends of the graphene/PDMS sensitive material layer 101 are led out by copper wires 103 and are attached to the PDMS film packaging layer 102, a layer of PDMS mixed liquid is coated on the upper layer of the PDMS film packaging layer, and the PDMS mixed liquid is placed into an oven for heating and curing to obtain the sandwich structure flexible temperature sensor 1 with the upper and lower layers of PDMS packages and the middle layer of sensitive material. In the invention, the heating curing temperature is preferably 60-100 ℃, and more preferably 80 ℃; the heating curing time is preferably 2.5h to 4h, and more preferably 3 h.
Therefore, the step (3) specifically includes:
mixing glue A and glue B of Dow Corning SYLGARD 184 to obtain PDMS mixed liquor; pouring the PDMS mixed solution into a mold, and heating and curing to obtain a PDMS film packaging layer 102; leading out two ends of the graphene/PDMS sensitive material layer 101 by using copper wires 103, and attaching one surface of the graphene/PDMS sensitive material layer 101 to the PDMS film packaging layer 102; and coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer 101, and putting the mixture into an oven for heating and curing to obtain the flexible temperature sensor 1.
In practical application, the thickness of the PDMS film encapsulation layer 102 is 0.6mm to 1.2 mm; preferably, the thickness of the PDMS thin film encapsulation layer 102 is 0.8 mm. In practical application, the mixing ratio of the glue A and the glue B of the Dow Corning SYLGARD 184 is preferably 8: 1-11: 1, and more preferably, the mixing ratio of the glue A and the glue B is 10: 1. In practical application, the temperature of heating and curing is 60-100 ℃; preferably, the temperature for heat curing is 80 ℃. In practical application, the heating and curing time is 2.5-4 h; preferably, the time for heat curing is 3 h. In practical applications, the mold is preferably a petri dish.
The body temperature monitoring system based on the flexible temperature sensor with the snake-shaped sandwich structure is constructed in a mode of simple process and low cost, can effectively reduce the influence of a strain signal generated by material stretching and the ambient temperature on the temperature sensor, can effectively monitor the body temperature for a long time, and reflects the health condition of a user.
Graphene is a novel two-dimensional carbon nanomaterial with a single-layer sheet structure composed of carbon atoms. Graphene is not only the thinnest of the known materials, but is also very strong and rigid, as a simple substance, it transports electrons faster at room temperature than known conductors. Meanwhile, the graphene can still keep better chemical stability under the bending and stretching conditions. The excellent characteristics of graphene make it an excellent candidate for a thermosensitive material.
Polydimethylsiloxane (PDMS) is a hydrophobic class of silicone materials. The PDMS film belongs to a high-molecular polymer film, is transparent in color, and has good flexibility, excellent chemical stability, thermal stability and biocompatibility. The PDMS film has many excellent performances, so that the PDMS film is widely applied to various intelligent electronic and flexible electronic devices, is attached to the skin and harmless to the human body, and is an excellent choice for preparing a flexible temperature sensor.
Therefore, the graphene/PDMS heat-sensitive material layer of the snake-shaped sandwich structure flexible temperature sensor is made of the graphene and PDMS materials, the temperature change can be responded quickly, the body temperature measurement efficiency is improved, the snake shape can effectively reduce the influence of strain signals generated by material stretching, and the accuracy of body temperature detection is improved.
Meanwhile, the graphene/PDMS heat-sensitive material layer of the snake-shaped sandwich structure flexible temperature sensor is packaged by the PDMS film, so that the graphene/PDMS heat-sensitive material layer can be effectively attached to the skin, the wearing comfort is improved, and the influence of the environmental temperature can be reduced.
To better illustrate the preparation method of the graphene/PDMS thermal sensitive material layer 101 of the flexible temperature sensor, three specific examples of fabricating the serpentine graphene/PDMS thermal sensitive material layer 101 are provided below.
Example 1
Weighing 0.4g of graphene, placing the graphene in a beaker, adding a certain amount of n-heptane, stirring, just enabling the n-heptane to submerge the graphene, and placing the graphene in an ultrasonic cleaner for ultrasonic dispersion for 1 hour to obtain a graphene/n-heptane dispersion liquid. 9.6g of Dow Corning 184A glue and 9.6g of Dow Corning B glue are weighed according to the mass ratio of the glue A to the glue B of 10:1, and the mixture is uniformly stirred to obtain PDMS mixed liquid. And mixing and stirring the graphene/n-heptane dispersion liquid and the PDMS mixed liquid for 20 minutes to obtain the graphene/PDMS suspension.
The graphene/PDMS suspension was heated and stirred at 60 ℃ for 2h until viscous. Pouring the graphene/PDMS suspension into a snake-shaped mask plate, and putting the snake-shaped mask plate into an oven to be heated and cured for 4 hours at 60 ℃ to obtain a snake-shaped graphene/PDMS heat-sensitive material layer 101, wherein the length of the graphene/PDMS heat-sensitive material layer 101 is 2.1cm, and the width of the graphene/PDMS heat-sensitive material layer is 1.4cm, as shown in FIG. 3.
Example 2
Weighing 0.5g of graphene, placing the graphene in a beaker, adding a certain amount of n-heptane, stirring, just enabling the n-heptane to submerge the graphene, and placing the graphene in an ultrasonic cleaner for ultrasonic dispersion for 1 hour to obtain a graphene/n-heptane dispersion liquid. 9.5g of Dow Corning 184A glue and 9.5g of Dow Corning B glue are weighed according to the mass ratio of the glue A to the glue B of 10:1, and the mixture is uniformly stirred to obtain PDMS mixed liquid. And mixing and stirring the graphene/n-heptane dispersion liquid and the PDMS mixed liquid for 20 minutes to obtain the graphene/PDMS suspension.
The graphene/PDMS suspension was heated and stirred at 60 ℃ for 2h until viscous. Pouring the graphene/PDMS suspension into a snake-shaped mask plate, and putting the snake-shaped mask plate into an oven to be heated and cured for 3h at 80 ℃ to obtain a snake-shaped graphene/PDMS heat-sensitive material layer, wherein the length of the graphene/PDMS heat-sensitive material layer 101 is 2.1cm, and the width of the graphene/PDMS heat-sensitive material layer is 1.4cm, as shown in FIG. 3.
Example 3
Weighing 1g of graphene, placing the graphene in a beaker, adding a certain amount of n-heptane, stirring, and placing the n-heptane in an ultrasonic cleaner for ultrasonic dispersion for 1h to obtain a graphene/n-heptane dispersion liquid. Weighing 9g of Dow Corning 184A glue and 9g of Dow Corning B glue according to the mass ratio of the glue A to the glue B of 10:1, and uniformly stirring to obtain PDMS mixed liquid. And mixing and stirring the graphene/n-heptane dispersion liquid and the PDMS mixed liquid for 20 minutes to obtain the graphene/PDMS suspension.
The graphene/PDMS suspension was heated and stirred at 60 ℃ for 2h until viscous. And pouring the graphene/PDMS suspension into a snake-shaped mask plate, and putting the snake-shaped mask plate into an oven for heating and curing at 100 ℃ for 2.5h to obtain a snake-shaped graphene/PDMS heat-sensitive material layer, wherein the length of the graphene/PDMS heat-sensitive material layer 101 is 2.1cm, and the width of the graphene/PDMS heat-sensitive material layer is 1.4cm, as shown in FIG. 3.
To better illustrate the preparation method of the PDMS film encapsulation layer 102 and the flexible temperature sensor, four specific embodiments of fabricating the PDMS film encapsulation layer 102 and the flexible temperature sensor 1 with the serpentine sandwich structure are provided below.
Example 4
Weighing 10g of Dow Corning 184A glue and 10g of Dow Corning B glue according to the mass ratio of the glue A to the glue B to be 8:1, uniformly stirring to obtain PDMS mixed liquid, coating a proper amount of PDMS mixed liquid in a culture dish, and placing the culture dish in an oven to be heated and cured for 4h at the temperature of 60 ℃ to obtain a PDMS film packaging layer 102, wherein the thickness of the film is 0.6 mm. One surface of the serpentine graphene/PDMS sensitive material layer 101 is attached to the PDMS film packaging layer 102, and two ends of the graphene/PDMS sensitive material layer 101 are led out by copper wires 103. Coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer 101, placing the mixture in an oven for heating and curing at 60 ℃ for 4h to obtain an upper PDMS film encapsulation layer 102 and a lower PDMS film encapsulation layer 102, wherein the sandwich structure flexible temperature sensor 1 is provided with the snakelike graphene/PDMS sensitive material layer 101 as an intermediate layer, as shown in FIG. 2.
Example 5
Weighing 10g of Dow Corning 184A glue and 10g of Dow Corning B glue according to the mass ratio of the glue A to the glue B to be 10:1, uniformly stirring to obtain PDMS mixed liquid, coating a proper amount of PDMS mixed liquid in a culture dish, and placing the culture dish in an oven to be heated and cured for 3h at the temperature of 80 ℃ to obtain a PDMS film with the thickness of 0.8 mm. One surface of the serpentine graphene/PDMS sensitive material layer 101 is attached to the PDMS film packaging layer 102, and two ends of the graphene/PDMS sensitive material layer 101 are led out by copper wires 103. Coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer 101, placing the mixture in an oven for heating and curing at 80 ℃ for 3h to obtain an upper PDMS film encapsulation layer 102 and a lower PDMS film encapsulation layer 102, wherein the sandwich structure flexible temperature sensor 1 is provided with the snakelike graphene/PDMS sensitive material layer 101 as the middle layer, as shown in FIG. 2.
Example 6
Weighing 10g of Dow Corning 184A glue and 10g of Dow Corning B glue according to the mass ratio of the glue A to the glue B of 11:1, uniformly stirring to obtain PDMS mixed liquid, coating a proper amount of PDMS mixed liquid in a culture dish, and placing the culture dish in an oven for heating and curing at 80 ℃ for 4h to obtain a PDMS film with the thickness of 0.8 mm. One surface of the serpentine graphene/PDMS sensitive material layer 101 is attached to the PDMS film packaging layer 102, and two ends of the graphene/PDMS sensitive material layer 101 are led out by copper wires 103. Coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer 101, placing the mixture in an oven for heating and curing at 80 ℃ for 3h to obtain an upper PDMS film encapsulation layer 102 and a lower PDMS film encapsulation layer 102, wherein the sandwich structure flexible temperature sensor 1 is provided with the snakelike graphene/PDMS sensitive material layer 101 as the middle layer, as shown in FIG. 2.
Example 7
Weighing 10g of Dow Corning 184A glue and 10g of Dow Corning B glue according to the mass ratio of the glue A to the glue B of 11:1, uniformly stirring to obtain PDMS mixed liquid, coating a proper amount of PDMS mixed liquid in a culture dish, and placing the culture dish in an oven for heating and curing at 100 ℃ for 2.5h to obtain a PDMS film with the thickness of 1.2 mm.
One surface of the serpentine graphene/PDMS sensitive material layer 101 is attached to the PDMS film packaging layer 102, and two ends of the graphene/PDMS sensitive material layer 101 are led out by copper wires 103. Coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer 101, placing the mixture in an oven for heating and curing at 100 ℃ for 2.5h to obtain an upper PDMS film encapsulation layer 102 and a lower PDMS film encapsulation layer 102, wherein the sandwich structure flexible temperature sensor 1 is provided with the snakelike graphene/PDMS sensitive material layer 101 as the middle layer, as shown in FIG. 2.
Fig. 4 is a schematic structural view of a body temperature monitoring system provided by the present invention. After the flexible temperature sensor 1 is obtained by adopting the preparation method, the flexible temperature sensor 1 is combined with the system circuit 2, and the body temperature data is read, processed and transmitted to the mobile terminal application 3. In the present invention, the system circuit 2 includes a power module 201, a data reading and processing circuit module 202, and a bluetooth module 203. Because flexible temperature sensor 1 is resistance-type temperature sensor, adopts bleeder circuit to read temperature signal with the voltage form, spreads voltage signal into data processing circuit and carries out processing such as enlargiing, filtering, AD conversion, transmits data information to bluetooth module 203 again, and bluetooth module 203 transmits data information wireless to removal end and uses 3. After the mobile application 3 acquires the information transmitted by the bluetooth module 203, the body temperature data is displayed in real time in a graph, curve or other mode.
Therefore, as shown in fig. 4, the present invention provides a body temperature monitoring system, comprising: a flexible temperature sensor 1, a system circuit 2 and a mobile end application 3.
Specifically, the flexible temperature sensor 1 is connected to the system circuit 2 through a copper wire 103, and the mobile terminal application 3 is wirelessly connected to the system circuit 2. Wherein the flexible temperature sensor 1 is used for collecting temperature signals and transmitting the temperature signals to the system circuit 2 through the copper wire 103. The system circuit 2 performs data processing on the temperature signal to obtain body temperature data, and transmits the body temperature data to the mobile terminal application 3 in a wireless manner. The mobile terminal application 3 visualizes the obtained body temperature data.
Specifically, the system circuit 2 includes: a power module 201, a data reading and processing circuit module 202 and a bluetooth module 203. The data reading and processing circuit module 202 is respectively connected with the power module 201 and the bluetooth module 203, and meanwhile, the power module 201 is connected with the bluetooth module 203. The power module 201 is configured to supply power to the data reading and processing circuit module 202 and the bluetooth module 203.
Specifically, the data reading and processing circuit module 202 includes a voltage divider circuit and a data processing circuit. The voltage division circuit is used for reading the temperature signal in a voltage form and transmitting a voltage signal to the data processing circuit. The data processing circuit is used for amplifying, filtering and A/D converting the voltage signal to obtain the body temperature data and transmitting the body temperature data to the Bluetooth module 203. The bluetooth module 203 is configured to wirelessly transmit the body temperature data to the mobile application 3. That is, since the flexible temperature sensor 1 is a resistance-type temperature sensor, the temperature signal is read in a voltage form by using a voltage dividing circuit, and the voltage signal is transmitted to a data processing circuit, and the temperature data is obtained by processing the voltage signal such as amplification, filtering, a/D conversion, and the like. And then transmits the body temperature data information to the bluetooth module 203, and the bluetooth module 203 wirelessly transmits the body temperature data information to the mobile terminal application 3. After the mobile terminal application 3 acquires the information transmitted by the bluetooth module 203, the body temperature data is displayed in real time in a graph, curve or other mode.
In practical application, the design of the system circuit PCB can be completed by using the Altium Designer; the Android Studio is used for developing the mobile terminal, compiling the application of the mobile terminal,
the flexible temperature sensor adopts the snake-shaped graphene/PDMS heat-sensitive material layer, can quickly respond to body temperature change, effectively reduces the influence of strain signals generated by material stretching and improves the accuracy of body temperature detection. Simultaneously, PDMS film encapsulation layer can effectively laminate skin, when promoting the wearing travelling comfort, can reduce ambient temperature's influence.
Compared with the prior art, the invention also constructs the body temperature monitoring system based on the snake-shaped sandwich structure flexible temperature sensor in a mode of simple process and low cost. According to the body temperature monitoring system provided by the invention, the body temperature data is acquired through the flexible temperature sensor, and is displayed in real time through the mobile terminal application, so that the real-time monitoring of the body temperature is realized, and the problems that the current temperature measurement mode is low in efficiency, the temperature sensor is easily influenced by the ambient temperature and strain signals and the like are solved. The mobile terminal application can display the body temperature data in real time through graphs, curves and the like, and user experience is greatly improved. The body temperature monitoring system based on the flexible temperature sensor with the snake-shaped sandwich structure can be attached to different parts to monitor the body temperature, and further the health condition of a user can be reflected by body temperature data.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A flexible temperature sensor of a serpentine sandwich structure, comprising: the graphene/polydimethylsiloxane PDMS thermal sensitive material layer, the PDMS film packaging layer and the copper wire; the graphene/PDMS thermal sensitive material layer is snake-shaped; two sides of the graphene/PDMS thermal sensitive material layer are packaged through the PDMS film packaging layer; and two ends of the graphene/PDMS thermal sensitive material layer are led out through the copper wires.
2. The flexible temperature sensor of claim 1, wherein the graphene/PDMS thermal sensitive material layer is made of graphene and PDMS.
3. The flexible temperature sensor according to claim 2, wherein the graphene/PDMS thermal sensitive material layer has a mass ratio of graphene to PDMS of 1:9 to 1: 24.
4. The flexible temperature sensor of claim 1, wherein the PDMS film encapsulation layer has a thickness of 0.6mm to 1.2 mm.
5. A preparation method of a flexible temperature sensor with a snake-shaped sandwich structure is characterized by comprising the following steps:
ultrasonically dispersing graphene through n-heptane, adding polydimethylsiloxane PDMS (polydimethylsiloxane) and fully stirring to obtain a graphene/PDMS suspension;
heating and stirring the graphene/PDMS suspension until the graphene/PDMS suspension is viscous, pouring the mixture into a snake-shaped mold, and putting the snake-shaped mold into a drying oven for heating and curing to obtain a snake-shaped graphene/PDMS heat-sensitive material layer;
and leading out two ends of the serpentine graphene/PDMS heat-sensitive material layer by using copper wires, and packaging two surfaces of the serpentine graphene/PDMS heat-sensitive material layer by using PDMS films to obtain the flexible temperature sensor.
6. The preparation method according to claim 5, wherein the graphene is ultrasonically dispersed in n-heptane, PDMS is added and the mixture is fully stirred to obtain the graphene/PDMS suspension, and the preparation method specifically comprises the following steps:
weighing a preset amount of graphene, and adding n-heptane to form a graphene/n-heptane mixed solution;
placing the graphene/n-heptane mixed solution into an ultrasonic cleaner for ultrasonic dispersion to obtain a graphene/n-heptane dispersion solution;
mixing the glue A and the glue B of the SYLGARD 184 of the Dow Corning uniformly to obtain PDMS mixed liquor;
and mixing the PDMS mixed solution and the graphene/n-heptane dispersion liquid to obtain the graphene/PDMS suspension.
7. The preparation method according to claim 5, wherein the graphene/PDMS suspension is heated and stirred to be viscous, then poured into a snake-shaped mold, and placed into an oven for heating and curing to obtain the snake-shaped graphene/PDMS thermal sensitive material layer, and the preparation method specifically comprises the following steps:
heating and stirring the graphene/PDMS suspension until the graphene/PDMS suspension is viscous, pouring the mixture into a snake-shaped mold, and putting the snake-shaped mold into a drying oven for heating and curing to obtain the snake-shaped graphene/PDMS heat-sensitive material layer; the mass ratio of graphene to PDMS in the graphene/PDMS heat-sensitive material layer is 1: 9-1: 24; the heating and stirring temperature is 50-70 ℃; the temperature of heating and curing is 60-100 ℃; the heating and curing time is 2.5-4 h.
8. The preparation method according to claim 5, wherein the flexible temperature sensor is obtained by leading out two ends of the serpentine graphene/PDMS thermal sensitive material layer by copper wires and packaging two surfaces of the serpentine graphene/PDMS thermal sensitive material layer by PDMS films, and specifically comprises:
mixing glue A and glue B of Dow Corning SYLGARD 184 to obtain PDMS mixed liquor;
pouring the PDMS mixed solution into a mold, and heating and curing to obtain a PDMS film packaging layer; the thickness of the PDMS film packaging layer is 0.6 mm-1.2 mm;
leading out two ends of the graphene/PDMS sensitive material layer by using copper wires, and attaching one surface of the graphene/PDMS sensitive material layer to the PDMS film packaging layer;
and coating a layer of PDMS mixed solution on the other surface of the graphene/PDMS sensitive material layer, and putting the mixture into an oven for heating and curing to obtain the flexible temperature sensor.
9. A body temperature monitoring system, comprising: the flexible temperature sensor, system circuitry and mobile-end application of claim 1;
the flexible temperature sensor is connected with the system circuit through a copper wire; the mobile terminal application is wirelessly connected with the system circuit;
the flexible temperature sensor is used for acquiring a temperature signal and transmitting the temperature signal to the system circuit through the copper wire;
the system circuit is used for carrying out data processing on the temperature signal to obtain body temperature data and transmitting the body temperature data to the mobile terminal in a wireless mode for application;
the mobile end application visualizes the body temperature data.
10. The body temperature monitoring system of claim 9, wherein the system circuitry comprises: the Bluetooth module comprises a power module, a data reading and processing circuit module and a Bluetooth module; the data reading and processing circuit module is respectively connected with the power module and the Bluetooth module; the power supply module is connected with the Bluetooth module;
the power module is used for supplying power to the data reading and processing circuit module and the Bluetooth module;
the data reading and processing circuit module comprises a voltage division circuit and a data processing circuit; the voltage division circuit is used for reading the temperature signal in a voltage form and transmitting a voltage signal to the data processing circuit; the data processing circuit is used for amplifying, filtering and A/D converting the voltage signal to obtain the body temperature data and transmitting the body temperature data to the Bluetooth module;
the Bluetooth module is used for wirelessly transmitting the body temperature data to the mobile terminal application.
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