阅读说明：本技术 基于离子热电材料的柔性温度传感器及其制备方法 (Flexible temperature sensor based on ionic thermoelectric material and preparation method thereof ) 是由 林强 李德钊 王煜猛 史胜南 阮杨涛 严勇 祁云峰 于 2020-10-28 设计创作，主要内容包括：本发明公开了基于离子热电材料的柔性温度传感器及其制备方法。本发明的传感器由上至下依次包括上电信号采集层、上电极层、电解质层、下电极层、下电信号采集层、柔性基底。电解质层整体为矩形平板,平板上下两面为对称的沟槽结构,上电极层和下电极层的一面分别附着在电解质层的上、下两面,并具有与电解质层对应的沟槽结构。上电信号采集层和下电信号采集层分别附着在上电极层和下电极层的一另面,下电信号采集层的引脚位于柔性基底上,上电信号采集层的引脚延伸至柔性基底上。本发明具有能够被动工作、能耗低的特点,并具有柔性可弯曲特点。(The invention discloses a flexible temperature sensor based on an ionic thermoelectric material and a preparation method thereof. The sensor comprises an upper electric signal acquisition layer, an upper electrode layer, an electrolyte layer, a lower electrode layer, a lower electric signal acquisition layer and a flexible substrate from top to bottom in sequence. The electrolyte layer is a rectangular flat plate as a whole, the upper surface and the lower surface of the flat plate are of symmetrical groove structures, one surface of the upper electrode layer and one surface of the lower electrode layer are respectively attached to the upper surface and the lower surface of the electrolyte layer, and the electrolyte layer is provided with a groove structure corresponding to the electrolyte layer. The upper electric signal acquisition layer and the lower electric signal acquisition layer are respectively attached to the other surfaces of the upper electrode layer and the lower electrode layer, pins of the lower electric signal acquisition layer are positioned on the flexible substrate, and the pins of the upper electric signal acquisition layer extend to the flexible substrate. The invention has the characteristics of passive work, low energy consumption and flexibility.)

1. Flexible temperature sensor based on ionic thermoelectric material, characterized in that: the flexible substrate comprises an upper electric signal acquisition layer, an upper electrode layer, an electrolyte layer, a lower electrode layer, a lower electric signal acquisition layer and a flexible substrate from top to bottom in sequence;

the electrolyte layer is integrally a rectangular flat plate, the upper surface and the lower surface of the flat plate are of symmetrical groove structures, and a plurality of grooves which are arranged in parallel penetrate through two side edges of the flat plate;

one surface of the upper electrode layer and one surface of the lower electrode layer are respectively attached to the upper surface and the lower surface of the electrolyte layer and are provided with groove structures corresponding to the electrolyte layer;

the upper electric signal acquisition layer comprises an upper layer integral part and an upper electric signal acquisition pin, the lower electric signal acquisition layer comprises a lower layer integral part and a lower electric signal acquisition pin, and the upper layer integral part and the lower layer integral part are respectively attached to the other surface of the upper electrode layer and the other surface of the lower electrode layer; the lower electric signal acquisition pin is positioned on the flexible substrate, and the upper electric signal acquisition pin extends to the flexible substrate from the upper layer integral part and is separated from the lower electric signal acquisition pin.

2. The flexible ionic thermoelectric material-based temperature sensor of claim 1, wherein: the thickness H of the electrolyte layer flat plate is 0.1-2 mm, the width l of the groove is 0.5-3 μm, and the depth H is 0.3-2 μm; the distance s between two adjacent grooves is 0.5-3 μm.

3. The flexible ionic thermoelectric material-based temperature sensor of claim 1, wherein: the thickness of the upper electric signal acquisition layer and the lower electric signal acquisition layer is 0.1-0.5 mu m.

4. The method for preparing the flexible temperature sensor is characterized by comprising the following steps:

step (1), preparing an electrolyte layer:

(1-1) adding the solid polyvinylidene fluoride-hexafluoropropylene copolymer into an N, N-dimethylformamide aqueous solution for full dissolution to form a dissolved solution;

(1-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at the temperature of 60-80 ℃ for 6-10 hours, then adding 1-ethyl, 3-methylimidazole bis (trifluoromethanesulfonimide) salt ionic liquid, and uniformly stirring to form an electrolyte solution;

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure;

step (2) preparing an electrode solution:

(2-1) adding the solid polyvinylidene fluoride-hexafluoropropylene copolymer into an N, N-dimethylformamide aqueous solution for full dissolution to form a dissolved solution;

(2-2) magnetically stirring the dissolved solution in a water bath environment at the constant temperature of 60-80 ℃ for 6-10 hours to obtain a prepared solution with uniform content; then adding carbon nano tubes and graphene oxide to form a homogeneous electrode solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

5. The method of making a flexible temperature sensor of claim 4, wherein: in the step (1-1), the concentration of the N, N-dimethylformamide aqueous solution is 0.1-0.2 g/ml, and the amount of the solid polyvinylidene fluoride-hexafluoropropylene copolymer added to each liter of the N, N-dimethylformamide aqueous solution is 150-250 g.

6. The method of making a flexible temperature sensor of claim 4, wherein: the mass ratio of the 3-methylimidazole bistrifluoromethanesulfonylimide ionic liquid added in the step (1-2) to the solid polyvinylidene fluoride-hexafluoropropylene copolymer added in the step (1-1) is 1: 0.5 to 1.5.

7. The method of making a flexible temperature sensor of claim 4, wherein: (1-4) the thickness H of the electrolyte layer flat plate with the groove structure formed after drying is 0.1-2 mm, the width l of the groove is 0.5-3 mu m, and the depth H is 0.3-2 mu m; the distance s between two adjacent grooves is 0.5-3 μm.

8. The method of making a flexible temperature sensor of claim 4, wherein: in the step (2-1), the concentration of the N, N-dimethylformamide aqueous solution is 0.1-0.2 g/ml, and the amount of the solid polyvinylidene fluoride-hexafluoropropylene copolymer added to each liter of the N, N-dimethylformamide aqueous solution is 200-300 g.

9. The method of making a flexible temperature sensor of claim 4, wherein: (2-2) adding 250-500 g of carbon nano tube and 50-100 g of graphene oxide into each liter of the preparation solution.

10. The method of making a flexible temperature sensor of claim 4, wherein: the flexible substrate is a polytetrafluoroethylene substrate.

Technical Field

The invention belongs to the technical field of sensors, and particularly relates to a flexible temperature sensor based on an ionic thermoelectric material and a preparation method of the temperature sensor.

Background

In view of the fact that temperature sensors can measure the temperature of objects, they are widely used in various aspects of human life. With the progress of the technology, the flexible temperature sensor is expected to acquire the body temperature signal of a human body in real time in a wearable mode, and has important application potential in various aspects such as medical monitoring, physiological health sensing, human-computer interaction and the like.

The flexible temperature sensor has the characteristics of flexibility, small volume and portability, and is concerned about. Traditional temperature sensors are mostly prepared based on inorganic materials, and the use in the field of wearable equipment is limited. The current flexible temperature sensor is limited by the limitations of flexible materials and structures, and has problems in measurement sensitivity and energy consumption control.

Disclosure of Invention

It is an object of the present invention to provide a flexible temperature sensor based on ionic pyroelectric materials, which can monitor the temperature of the measured object without external power supply.

The invention comprises an upper electric signal acquisition layer, an upper electrode layer, an electrolyte layer, a lower electrode layer, a lower electric signal acquisition layer and a flexible substrate from top to bottom in sequence.

The electrolyte layer is a rectangular flat plate as a whole, the upper surface and the lower surface of the flat plate are of symmetrical groove structures, and a plurality of grooves which are arranged in parallel penetrate through two side edges of the flat plate.

One surface of the upper electrode layer and one surface of the lower electrode layer are respectively attached to the upper surface and the lower surface of the electrolyte layer, and the groove structure corresponding to the electrolyte layer is formed.

The upper electric signal acquisition layer comprises an upper layer integral part and an upper electric signal acquisition pin, the lower electric signal acquisition layer comprises a lower layer integral part and a lower electric signal acquisition pin, and the upper layer integral part and the lower layer integral part are respectively attached to the other surface of the upper electrode layer and the other surface of the lower electrode layer; the lower electric signal acquisition pin is positioned on the flexible substrate, and the upper electric signal acquisition pin extends to the flexible substrate from the upper layer integral part and is separated from the lower electric signal acquisition pin.

Furthermore, the thickness H of the electrolyte layer flat plate is 0.1-2 mm, the width l of the groove is 0.5-3 μm, and the depth H is 0.3-2 μm; the distance s between two adjacent grooves is 0.5-3 μm.

Further, the thickness of the upper electric signal acquisition layer and the lower electric signal acquisition layer is 0.1-0.5 μm.

Another object of the present invention is to provide a method for manufacturing the flexible temperature sensor.

The preparation method specifically comprises the following steps:

step (1), preparing an electrolyte layer:

(1-1) adding the solid polyvinylidene fluoride-hexafluoropropylene copolymer into an N, N-dimethylformamide aqueous solution for full dissolution to form a dissolved solution;

(1-2) stirring the dissolved solution in a water bath environment at the constant temperature of 60-80 ℃ for 6-10 hours by magnetic force, then adding 1-ethyl, 3-methylimidazole bis (trifluoromethanesulfonimide) salt ionic liquid, and stirring uniformly to form an electrolyte solution

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure;

step (2) preparing an electrode solution:

(2-1) adding the solid polyvinylidene fluoride-hexafluoropropylene copolymer into an N, N-dimethylformamide aqueous solution for full dissolution to form a dissolved solution;

(2-2) magnetically stirring the dissolved solution in a water bath environment at the constant temperature of 60-80 ℃ for 6-10 hours to obtain a prepared solution with uniform content; then adding carbon nano tubes and graphene oxide to form a homogeneous electrode solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

Further, in the step (1-1), the concentration of the N, N-dimethylformamide aqueous solution is 0.1-0.2 g/ml, and the amount of the solid polyvinylidene fluoride-hexafluoropropylene copolymer added to each liter of the N, N-dimethylformamide aqueous solution is 150-250 g.

Further, the mass ratio of the 3-methylimidazole bistrifluoromethanesulfonylimide ionic liquid added in the step (1-2) to the solid polyvinylidene fluoride-hexafluoropropylene copolymer added in the step (1-1) is 1: 0.5 to 1.5.

Further, the thickness H of the electrolyte layer flat plate with the groove structure formed in the step (1-4) after drying is 0.1-2 mm, the width l of the groove is 0.5-3 μm, and the depth H is 0.3-2 μm; the distance s between two adjacent grooves is 0.5-3 μm.

Further, in the step (2-1), the concentration of the N, N-dimethylformamide aqueous solution is 0.1-0.2 g/ml, and the amount of the solid polyvinylidene fluoride-hexafluoropropylene copolymer added to each liter of the N, N-dimethylformamide aqueous solution is 200-300 g.

Further, 250-500 g of carbon nano tube and 50-100 g of graphene oxide are added into each liter of the preparation solution in the step (2-2).

Further, the flexible substrate is a polytetrafluoroethylene substrate.

The sensor is based on the basic characteristics of the ionic thermoelectric material, namely different voltages can be output under the condition that different temperature differences exist at two ends of the material, so that the sensor has the characteristics of passive work and low energy consumption, and meanwhile, the application potential of the sensor in the wearable field is ensured because the material is a flexible and bendable substrate.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

fig. 3 is a schematic structural view of the electrolyte layer.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples. It should be noted that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.

As shown in fig. 1 and 2, the flexible temperature sensor based on the ionic thermoelectric material comprises an upper electric signal acquisition layer 1, an upper electrode layer 2, an electrolyte layer 3, a lower electrode layer 4, a lower electric signal acquisition layer 5 and a flexible substrate 6 from top to bottom.

As shown in fig. 3, the electrolyte layer 3 is a rectangular flat plate, and the upper and lower surfaces of the flat plate are symmetrical groove structures; a plurality of parallel arranged grooves penetrate through both side edges of the flat plate. The thickness H of the electrolyte layer flat plate is 0.1-2 mm, the width l of the groove is 0.5-3 μm, and the depth H is 0.3-2 μm; the distance s between two adjacent grooves is 0.5-3 μm.

One surface of the upper electrode layer 2 and one surface of the lower electrode layer 4 are attached to the upper and lower surfaces of the electrolyte layer 3, respectively, and have a trench structure corresponding to the electrolyte layer 3.

The upper electric signal acquisition layer 1 comprises an upper layer integral part and an upper electric signal acquisition pin, the lower electric signal acquisition layer 5 comprises a lower layer integral part and a lower electric signal acquisition pin, and the upper layer integral part and the lower layer integral part are respectively attached to the other surface of the upper electrode layer and the other surface of the lower electrode layer; the lower electric signal acquisition pin is positioned on the flexible substrate 6, and the upper electric signal acquisition pin extends to the flexible substrate from the upper layer integral part and is separated from the lower electric signal acquisition pin. The thickness of the upper layer integral part and the lower layer integral part is 0.1-0.5 μm.

The specific preparation method of the flexible temperature sensor comprises the following steps:

example 1.

Step (1), preparing an electrolyte layer:

(1-1) adding 150g of solid polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) into 1 liter of N, N-Dimethylformamide (DMF) water solution with the concentration of 0.1g/ml for fully dissolving to form a dissolved solution;

(1-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at 70 ℃ for 8 hours, then adding 100g of 1-ethyl, 3-methylimidazole bis (trifluoromethanesulfonimide) salt (EMIMT-TFSI) ionic liquid, and uniformly stirring to form an electrolyte solution;

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure, wherein the thickness H of the electrolyte layer is 2mm, the width l of each groove is 3 micrometers, the depth H of each groove is 2 micrometers, and the distance s between every two adjacent grooves is 3 micrometers;

step (2) preparing an electrode solution:

(2-1) adding 200g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.1g/ml for sufficient dissolution to form a dissolved solution;

(2-2) carrying out constant-temperature magnetic stirring on the dissolved solution in a water bath environment at 65 ℃ for 9 hours to obtain a prepared solution with uniform content; then adding Carbon Nanotubes (CNTs) and Graphene Oxide (GO) to form a homogeneous electrode solution; adding 250g of CNTs and 50g of GO into each liter of the prepared solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film with the thickness of 0.5 mu m on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin; the flexible substrate can be a polytetrafluoroethylene substrate;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

Example 2.

Step (1), preparing an electrolyte layer:

(1-1) adding 200g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.15g/ml for sufficient dissolution to form a dissolved solution;

(1-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at 60 ℃ for 10 hours, then adding 400g of EMIMT-TFSI ionic liquid, and uniformly stirring to form an electrolyte solution;

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure, wherein the thickness H of the electrolyte layer is 1mm, the width l of each groove is 1.5 mu m, the depth H of each groove is 1 mu m, and the distance s between every two adjacent grooves is 1.5 mu m;

step (2) preparing an electrode solution:

(2-1) adding 250g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.15g/ml for sufficient dissolution to form a dissolved solution;

(2-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at 80 ℃ for 6 hours to obtain a prepared solution with uniform content; then adding CNTs and graphene oxide GO to form a homogeneous electrode solution; adding 350g of CNTs and 100g of GO into each liter of the prepared solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film with the thickness of 0.3 mu m on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

Example 3.

Step (1), preparing an electrolyte layer:

(1-1) adding 250g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.2g/ml for sufficient dissolution to form a dissolved solution;

(1-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at 80 ℃ for 6 hours, then adding 250g of EMIMT-TFSI ionic liquid, and uniformly stirring to form an electrolyte solution;

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure, wherein the thickness H of the electrolyte layer is 0.1mm, the width l of each groove is 0.5 mu m, the depth H of each groove is 0.3 mu m, and the distance s between every two adjacent grooves is 0.5 mu m;

step (2) preparing an electrode solution:

(2-1) adding 300g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.2g/ml for sufficient dissolution to form a dissolved solution;

(2-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at 60 ℃ for 10 hours to obtain a prepared solution with uniform content; then adding CNTs and graphene oxide GO to form a homogeneous electrode solution; adding 500g of CNTs and 80g of GO into each liter of the prepared solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film with the thickness of 0.1 mu m on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

Example 4.

Step (1), preparing an electrolyte layer:

(1-1) adding 180g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.16g/ml for sufficient dissolution to form a dissolved solution;

(1-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment at 75 ℃ for 7 hours, then adding 100g of EMIMT-TFSI ionic liquid, and uniformly stirring to form an electrolyte solution;

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure, wherein the thickness H of the electrolyte layer is 0.5mm, the width l of each groove is 1.5 mu m, the depth H of each groove is 0.5 mu m, and the distance s between every two adjacent grooves is 1.5 mu m;

step (2) preparing an electrode solution:

(2-1) adding 240g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.18g/ml for sufficient dissolution to form a dissolved solution;

(2-2) carrying out constant-temperature magnetic stirring on the dissolved solution in a water bath environment at the temperature of 75 ℃ for 7 hours to obtain a prepared solution with uniform content; then adding CNTs and graphene oxide GO to form a homogeneous electrode solution; adding CNTs (400 g) and GO (60 g) into each liter of the prepared solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film with the thickness of 0.2 mu m on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

Example 5.

Step (1), preparing an electrolyte layer:

(1-1) adding 220g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.18g/ml for sufficient dissolution to form a dissolved solution;

(1-2) magnetically stirring the dissolved solution at a constant temperature in a water bath environment of 65 ℃ for 9 hours, then adding 120g of EMIMT-TFSI ionic liquid, and uniformly stirring to form an electrolyte solution;

(1-3) standing the electrolyte solution to a gel state in a vacuum environment to form electrolyte gel;

(1-4) extruding the electrolyte gel into a flat plate with grooves on the upper and lower surfaces through a die; drying in an inert gas environment to form an electrolyte layer with a groove structure, wherein the thickness H of the electrolyte layer is 1.5mm, the width l of each groove is 2 micrometers, the depth H of each groove is 1 micrometer, and the distance s between every two adjacent grooves is 2 micrometers;

step (2) preparing an electrode solution:

(2-1) adding 250g of solid PVDF-HFP into 1 liter of DMF aqueous solution with the concentration of 0.18g/ml for sufficient dissolution to form a dissolved solution;

(2-2) carrying out constant-temperature magnetic stirring on the dissolved solution in a water bath environment at the temperature of 75 ℃ for 7 hours to obtain a prepared solution with uniform content; then adding CNTs and graphene oxide GO to form a homogeneous electrode solution; adding 300g of CNTs and 90g of GO into each liter of the prepared solution;

step (3) preparing an electrode layer:

(3-1) adhering a metal film with the thickness of 0.4 mu m on a flexible substrate, and exposing and etching to obtain a lower electric signal acquisition layer; the lower electric signal acquisition layer comprises a lower integral part and a lower electric signal acquisition pin; the flexible substrate is a polytetrafluoroethylene substrate;

(3-2) placing the electrode solution on the whole part of the lower electric signal acquisition layer, and standing to a gel state to form a gelatinous electrode film;

(3-3) placing an electrolyte layer on the electrode film, placing another electrode film on the electrolyte layer, and performing hot-pressing combination to form a lower electrode layer and an upper electrode layer; the upper electrode layer and the lower electrode layer are provided with groove structures corresponding to the electrolyte layer;

step (4), attaching a metal film on the upper electrode layer by a magnetic co-sputtering method to obtain an electrified signal acquisition layer; the power-on signal acquisition layer extends to the flexible substrate to serve as a power-on signal acquisition pin.

Under the working state, when the temperatures of the upper surface and the lower surface of the flexible sensor are different, due to the thermionic effect, anions and cations in the flexible electrolyte diffuse and move to the upper electrode layer and the lower electrode layer under the action of the temperature gradient force. Due to the fact that the enrichment degree of the anions and the cations of the upper electrode and the lower electrode is different, the voltage difference between the two ends of the sensor is different, and the magnitude of the voltage difference depends on the temperature difference between the two ends of the sensor.

Use scheme 1: the sensor is worn on the skin surface during patient monitoring. Because the environmental temperature of the ward is basically unchanged, when the temperature of the human body changes, the voltage of the sensor changes, and the real-time monitoring of the body temperature of the patient can be realized.

Use scheme 2: ordinary people wear this sensor, because normal human temperature change is not big, when the environment takes place great temperature change, great voltage can be produced at the sensor both ends, reminds the people suitably to increase and decrease the clothes, ensures that the user's is healthy.