CN112504542B - Application of sensitive material in flexible vacuum pressure sensor - Google Patents
Application of sensitive material in flexible vacuum pressure sensor Download PDFInfo
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- CN112504542B CN112504542B CN202011293898.8A CN202011293898A CN112504542B CN 112504542 B CN112504542 B CN 112504542B CN 202011293898 A CN202011293898 A CN 202011293898A CN 112504542 B CN112504542 B CN 112504542B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Abstract
The invention relates to the technical field of flexible electronic materials, in particular to application of a sensitive material in a flexible vacuum pressure sensor. The sensitive material is highly sensitive to gas, the concentration of oxygen molecules in the atmosphere is positively correlated with the gas pressure, when the sensitive material is exposed to a gas environment, the resistance of the sensitive material is obviously changed along with the change of the gas pressure, and the sensitive material is applied to a flexible vacuum pressure sensor, the sensor responds to different pressure environments through the change of resistance values, the sensitivity is high, the flexible vacuum pressure sensor is good in stability and reliability, the pressure change is circularly applied, the resistivity of a device also shows cyclical change, the hysteresis of the pressure loading and unloading is not obvious, and the sensitive material has good linear characteristics for different vacuum pressures. The conductive nanomaterial of the flexible vacuum pressure sensor has a larger contact angle and shows superhydrophobic performance. Therefore, the flexible pressure sensing device can be used for intelligent clothing and medical equipment and real-time monitoring of vacuum pressure.
Description
Technical Field
The invention relates to the technical field of flexible electronic materials, in particular to application of a sensitive material in a flexible vacuum pressure sensor.
Background
Wearable electronics have attracted a great deal of attention due to their importance in disposable electronics, sensors, and health monitoring systems. Today, these wearable devices are very popular around the world, such as new marketed wrist watches, *** glasses, bracelets and glasses, which are achieved by the miniaturization of current electronic components. In recent years, electronic textiles have attracted tremendous scientific and commercial interest as a new generation of wearable electronics due to their potential applications in flexible electronics, sensors and multifunctional smart apparel. The novel wearable electronic product has the advantages of light weight, low cost, stretchability, foldability and the like, and can be realized to provide convenience for our living service by integrating advanced electronic functions into common and insulating textiles to form the electronic textiles.
In addition, the sensor is required to have high sensitivity to monitor physiological signals of a human body, gas, light, and the like. In practice, the sensor has various configurations, such as piezoresistive sensor, piezoelectric device, capacitive sensor, field effect transistor, etc. And all the information obtained can be analyzed and compared to standard reference data and any abnormal signals sent to the physician for monitoring, alerting and further diagnosis. For different kinds of sensors, there are various sensing materials such as carbon, metal oxide nanowires, conductive elastomer composites, silicon nanowires, and the like. However, no two-dimensional carbon nanotube and MXene materials have been used in vacuum pressure sensors.
Disclosure of Invention
In view of the above, the invention provides an application of a sensitive material in a flexible vacuum pressure sensor, wherein the carbon nano tube and the MXene two-dimensional material in the sensitive material are highly sensitive to gas in the environment, when the sensitive material is exposed to the gas environment, the resistance of the sensitive material is obviously changed, and the sensitive material is applied to the flexible vacuum pressure sensor, and the sensor responds to different pressure environments through the change of the resistance value, so that the sensitivity is high.
The specific technical scheme is as follows:
the invention provides application of a sensitive material in a flexible vacuum pressure sensor, wherein the sensitive material consists of a flexible substrate and a conductive nano material;
the flexible substrate is connected with the conductive nanomaterial by ultrasonic welding;
the flexible substrate is a flexible polymer material with the glass transition temperature less than 81 ℃, and the conductive nano material is a carbon nano tube or an MXene two-dimensional material.
It should be noted that only the flexible polymer material having a glass transition temperature of less than 81 ℃ can be melted during the ultrasonic welding process, so that the flexible polymer material is fused with the conductive material, has good stretchability, is bendable, and is suitable for being used as a substrate of a wearable device.
The sensitive material of the invention shows n-type semiconductor characteristic, when the conductive nano material is carbon nano tube, the carbon nano tube CNTs naturally absorb oxygen from air, and has stronger electron affinity. At atmospheric pressure, a large number of oxygen molecules (O 2 ) Is adsorbed to the exposed surface of CNTs, and electrons (e-) in the conductive band can be trapped as negatively charged oxygen ions (O 2- ) Resulting in a reduction of the number of free electrons in the air of the sensitive material, presenting a high resistance phenomenon. The concentration of oxygen molecules in the atmospheric pressure is constant, and the corresponding O is reduced with the decrease of the atmospheric pressure 2 The amount of free electrons in the air of the sensitive material increases and the resistance value decreases with decreasing pressure. The sensor responds to different pressure environments through the change of the resistance value, the flexible vacuum pressure sensor is high in sensitivity, the stability and reliability are good, the pressure change is circularly applied, the device resistivity also shows cyclical change, hysteresis is not obvious when the pressure is loaded and unloaded, and the sensor has good linear characteristics for different vacuum pressures. The conductive nanomaterial of the flexible vacuum pressure sensor has a larger contact angle and shows superhydrophobic performance. Therefore, the flexible pressure sensing device can be used for intelligent clothing and medical equipment and real-time monitoring of vacuum pressure.
The Mxene two-dimensional material belongs to a novel two-dimensional material, is sensitive to volatile organic compounds, and when molecular gas is adsorbed on the surface layer of the two-dimensional material, the concentration change of charge carriers on the surface layer of the layered nano-sheet of the two-dimensional material is caused, so that the conductivity of the surface layer of the whole two-dimensional material is changed. The conductivity of the two-dimensional material is regulated by the type of gas.
In the invention, the flexible substrate is non-woven fabric, preferably non-woven fabric made of polypropylene and viscose, polypropylene fiber or terylene; the glass transition temperature of the polypropylene is 35 ℃, and the glass transition temperature of the terylene is 67-81 ℃.
The flexible substrate is a pretreated flexible substrate, and the pretreatment specifically comprises:
ultrasonic cleaning the flexible substrate, soaking the flexible substrate in isopropanol saturated solution, and drying the flexible substrate for later use;
the temperature of the drying of the ultrasonic cleaning is 50-80 ℃, preferably 60 ℃, the process parameters of the ultrasonic cleaning are that the maximum power is 150W, and the frequency range is 20-90 kHz; the drying time is 1-6 h, preferably 3h;
the thickness of the flexible substrate is 140 μm to 160 μm, preferably 150 μm.
The conductive nano material is a carbon nano tube or an MXene two-dimensional material, preferably a carbon nano tube, more preferably a carbon nano tube, and further preferably a multi-wall carbon nano tube; the outer diameter of the multi-wall carbon nano tube is 10-15 nm, the length is 0.1-10 mu m, and the purity of the multi-wall carbon nano tube is 98%.
In the invention, the preparation method of the sensitive material comprises the following steps:
immersing the flexible substrate in the dispersion liquid of the conductive nano material, and performing ultrasonic nano welding to obtain the sensitive material.
The flexible substrate is subjected to ultrasonic welding in the conductive nano material dispersion liquid, so that the flexible substrate can be locally softened, the binding force between the conductive nano material and the flexible substrate is enhanced, the conductive nano material is not easy to fall off from the conductive substrate, and the electronic textile with durability and washability is formed.
The ultrasonic welding process used by the invention is simple and has lower cost.
The preparation method of the dispersion liquid of the conductive nano material specifically comprises the following steps:
mixing a conductive nano material, a surfactant and a solvent, and then performing ultrasonic dispersion treatment to obtain a dispersion liquid of the conductive nano material;
the mass ratio of the conductive nano material to the surfactant is (5-10): 1, preferably 10:1, a step of;
the surfactant sodium dodecyl sulfate or polyacrylamide is preferably sodium dodecyl sulfate;
the solvent is aqueous solution of isopropanol or aqueous solution of absolute ethyl alcohol, preferably aqueous solution of isopropanol, and the volume concentration of the solvent is 25% -50%, preferably 25%;
the ultrasonic dispersion time is 15min-30min, preferably 30min;
the concentration of the conductive nanomaterial in the dispersion of the conductive nanomaterial is 0.1-0.5 mg/ml, preferably 0.1mg/ml.
The ultrasonic welding temperature is 0 ℃, the time is 3-30 min, the maximum output power is 2000W, the amplitude is 60%, and the frequency is 20kHz.
In the invention, sensitive materials are also required to be subjected to post-treatment; the post-treatment specifically comprises the following steps: washing with deionized water and isopropanol or absolute ethyl alcohol, ultrasonic cleaning with deionized water, and oven drying.
In the invention, the copper wire is tightly combined with the sensitive material by using the conductive silver adhesive to prepare the flexible vacuum pressure sensor. The preparation of the flexible vacuum pressure sensor belongs to the prior art and is not described in detail here.
From the above technical scheme, the invention has the following advantages:
the invention provides application of a sensitive material in a flexible vacuum pressure sensor, wherein the sensitive material consists of a flexible substrate and a conductive nano material; the flexible substrate is connected with the conductive nanomaterial by ultrasonic welding; the flexible substrate is a flexible polymer material with the glass transition temperature less than 81 ℃, and the conductive nano material is a carbon nano tube or an MXene two-dimensional material.
The sensitive material is highly sensitive to gas, the concentration of oxygen molecules in the atmosphere is positively correlated with the gas pressure, when the sensitive material is exposed to a gas environment, the resistance of the sensitive material is obviously changed along with the change of the gas pressure, and the sensitive material is applied to a flexible vacuum pressure sensor, the sensor responds to different atmospheric pressure environments through the change of resistance values, the sensitivity is high, the flexible vacuum pressure sensor is good in stability and reliability, the pressure change is circularly applied, the resistivity of the device also shows cyclical change, the hysteresis of the pressure loading and unloading is not obvious, and the sensitive material has good linear characteristics for different vacuum pressures. The conductive nanomaterial of the flexible vacuum pressure sensor has a larger contact angle and shows superhydrophobic performance. Therefore, the flexible pressure sensing device can be used for intelligent clothing and medical equipment and real-time monitoring of vacuum pressure.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of the preparation of the carbon nanotube/nonwoven fabric according to example 1 of the present invention;
FIG. 2 is a schematic view of ultrasonic welding of the conductive nanomaterial of carbon nanotubes of the present invention;
FIG. 3 is a scanning electron microscope image of a carbon nanotube/nonwoven fabric according to example 1 of the present invention;
FIG. 4 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to example 1 of the present invention under different strain changes (the inset shows the graph of the maximum uniaxial tensile force and stress-strain of the flexible vacuum pressure sensor device and the original nonwoven fabric);
FIG. 5 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to embodiment 1 of the present invention at different pressures;
FIG. 6 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to embodiment 1 of the present invention during a cyclic pressure test;
FIG. 7 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to example 1 of the present invention at different washing times;
fig. 8 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to example 1 of the present invention at different pressures before and after mechanical washing for 48 hours.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The raw materials and reagents involved in the examples of the present invention are all commercially available.
Example 1
The embodiment is a flexible vacuum pressure sensor, and the specific preparation steps refer to fig. 1:
(1) Pretreatment of nonwoven fabric (made of polypropylene and viscose): in deionized water, ultrasonically cleaning the non-woven fabric for 5min, wherein the frequency is 20kHz; the isopropanol saturated nonwoven fabric was dried at 60℃for 3 hours, and the NWF with a thickness of 150 μm was cut into substrates with dimensions of 3.0 cm. Times.1.5 cm for use.
(2) Ultrasonic nanowelding: firstly, weighing the following components in percentage by mass: 10 sodium dodecyl sulfate and multiwall carbon nanotubes (MWCNTs) (with the outer diameter of 10-15 nm and the length of 0.1-10 mu m) are mixed in a beaker, then deionized water solvent with the volume fraction of 25% isopropanol is injected, and the whole system is subjected to ultrasonic dispersion for 30min to obtain multiwall carbon nanotube dispersion liquid (0.1 mg/ml);
immersing the pretreated non-woven fabric fibers in a multiwall carbon nanotube dispersion liquid, placing a solution system in an ice-water mixture at 0 ℃, then performing ultrasonic nanowelding at 0 ℃ for 15min, washing a sample subjected to ultrasonic nanowelding with deionized water and isopropanol respectively until no black particles fall off, and then placing the sample in deionized water for ultrasonic cleaning for 5min, wherein the frequency is 20kHz; and (5) placing the sample in a drying box at 60 ℃ for drying to obtain a sensitive material (carbon nano tube/non-woven fabric) which is marked as CNTs/NWF. Wherein the maximum output power of the ultrasonic nanowelder is 2000W, the amplitude is 60% and the frequency is 20kHz.
(3) And fixing two copper wires on two sides of the carbon nano tube/non-woven fabric by using conductive silver paste for packaging to obtain the flexible vacuum pressure sensor.
FIG. 2 is a schematic diagram of ultrasonic welding of a conductive nanomaterial of carbon nanotubes in accordance with the present invention, wherein ultrasonic vibration generates a large amount of bubbles in a liquid, and the generated bubbles collapse to generate a large pressure and high temperature, providing sufficient momentum and energy for the carbon nanotubes to be welded to the surface of a substrate and to the internal structure, forming a sensitive material.
Fig. 3 is an electron microscope image with different resolutions according to embodiment 1 of the present invention, in which carbon nanotubes and non-woven fabric fibers in a carbon nanotube/non-woven fabric sample are entangled and bonded, and the carbon nanotubes are randomly and continuously distributed and even penetrate into the fabric to form a conductive network structure. The method for welding the carbon nano tube to the non-woven fabric fiber by the ultrasonic welding technology has strong bonding force between the carbon nano tube and the non-woven fabric fiber, and the multi-wall carbon nano tube can be stably maintained in the non-woven fabric, so that the sensor has washability and durability.
The flexible vacuum pressure sensor of example 1 was subjected to pressure using an Instron electronic universal material tester while the resistance values across the device were measured using a semiconductor parameter analyzer (Keithley 2400). Fig. 4 is a graph showing the change in resistance of the flexible vacuum pressure sensor device according to embodiment 1 of the present invention under different strain changes, and as shown in fig. 4, when the strain is less than 9.4%, the resistance of the carbon nanotube/non-woven fabric is first reduced with the reduction of the strain, and then increased with the increase of the strain, wherein the increase of the resistance is attributable to the unrecoverable fracture of the NWF fiber interconnection network structure. The result shows that the carbon nano tube/non-woven fabric has sensitive response to strain and can be used as a strain sensor; meanwhile, the flexible vacuum pressure sensor prepared by the ultrasonic nanometer welding technology has good conductivity, and the direct-current power supply is used for connecting the carbon nano tube non-woven fabric sensitive material to a complete circuit, so that the light-emitting diode can emit light normally.
The flexible vacuum pressure sensor device of example 1 and the original nonwoven were stress tested using an Instron electronic universal materials tester and data analysis was performed using blue hill 2.0 software. The inset of fig. 4 shows the maximum uniaxial tensile force and stress-strain curve of the flexible vacuum pressure sensor and the original nonwoven, and as shown in the inset of fig. 4, the required stress increases with the increase of the strain of the carbon nanotube-graphene/nonwoven and the original nonwoven within the range of 0-39.8% of the tensile strain; in the range of 39.8-75% tensile strain, the required stress is reduced with the increase of strain, which means that the deformation exceeds 39.8%, and the fiber interconnection network structure in the non-woven fabric is not reversed damaged. In the range of 0-45% of tensile strain, the stress required by the carbon nano tube-graphene/non-woven fabric is larger than that of the original non-woven fabric, and the maximum tensile strain is 39.8%, which indicates that the mechanical properties of the non-woven fabric are not changed by ultrasonic welding, and the tensile strength and Young modulus of the non-woven fabric are almost the same as those of the original non-woven fabric and even slightly higher than those of the original non-woven fabric.
The flexible vacuum pressure sensor of example 1 was placed in a chamber for measuring vacuum pressure sensing characteristics to apply different pressure conditions while measuring the resistance of the sensor in situ using a Keithley 2400Source-Meter SMU instrument. FIG. 5 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to embodiment 1 of the present invention at different pressures, as shown in FIG. 5, at 1000, 100, 10,1,2.4 ×10 -2 ，6.5×10 -3 ，5.2×10 -4 ，7.3×10 -5 At pressures of millibars (mbar), the corresponding resistances are 9766.5 Ω,9717.1 Ω,9579.6 Ω,9536.1 Ω,9501.3 Ω,9467.5 Ω (ohms), respectively, and it can be clearly observed that the flexible vacuum pressure sensor has a sensitive response to different pressure environments, the resistance of which decreases with decreasing vacuum pressure. This is due to the fact that the formation of CNTs/NWF composites exhibits n-type semiconductor properties, natural absorption of oxygen from air, and a strong electron affinity. At atmospheric pressure, a large number of oxygen molecules (O 2 ) Is adsorbed to the exposed surface of CNTs, and electrons (e-) in the conductive band can be trapped as negatively charged oxygen ions (O 2- ) Resulting in a reduced number of free electrons in air for the CNTs/NWF composites, exhibiting high resistance phenomena. The concentration of oxygen molecules in the atmospheric pressure is constant, and the corresponding O is reduced with the decrease of the atmospheric pressure 2 Will decrease, the number of free electrons in air of the CNTs/NWF composite increases, and the resistance thereof is increasedWill decrease with decreasing pressure.
The flexible vacuum pressure sensor of example 1 was placed in a chamber for measuring vacuum pressure sensing characteristics and cycled for the same pressure conditions while measuring the resistance of the sensor in situ using a Keithley 2400Source-Meter SMU instrument. FIG. 6 is a graph showing the resistance change of the flexible vacuum pressure sensor device according to example 1 of the present invention under cyclic pressure, wherein the test method is a CNTs/NWF cyclic application of 7.3X10 -5 And two gas pressures of 1000mbar, and the change of the resistance value is detected simultaneously. As can be seen from fig. 6, the resistance value of CNTs/NWF also shows cyclicity due to the cyclic pressure change, and hysteresis is not significant during pressure loading and unloading, which indicates that the prepared flexible vacuum pressure sensor has higher sensitivity and repeatability on air pressure.
The flexible vacuum pressure sensor of example 1 was placed in DI water with detergent at a rapid stirring rate of 700rpm and then dried. Fig. 7 is a graph showing the resistance change of the flexible vacuum pressure sensor device provided in example 1 of the present invention under different washing times, so as to obtain the changes of the resistance values of the CNTs/NWF electronic textile sensor in DI water and detergent DI along with the washing time, respectively. As shown in fig. 7, after mechanical washing, the resistances of the CNTs/NWF electronic textile sensors with net resistances of 9.7kΩ and 9.9kΩ respectively increase, and the resistances remain substantially unchanged after long-time washing, which is attributed to the strong adhesion of the carbon nanotubes firmly inserted into the fibers, and only a small amount of carbon nanotubes drop off from the device surface under stronger mechanical destruction and chemical action, reflecting the good wash fastness of the CNTs/NWF flexible electronic textile vacuum pressure sensor prepared by the ultrasonic method. In addition, it can be seen from the inset of fig. 7 that the CNTs/NWF flexible electronic textile vacuum pressure sensor exhibits superhydrophobic performance.
Fig. 8 is a graph showing the resistance change of the flexible vacuum pressure sensor provided in embodiment 1 of the present invention under different pressures before and after mechanical washing for 48 hours, as can be seen from fig. 8, the resistivity of the device increases after 48 hours washing, and the resistance increases with the increase of the vacuum pressure. The flexible vacuum pressure sensor has good sensitivity to different air pressures before and after mechanical washing for 48 hours, and generates good linear characteristic response to the pressure, which indicates that the device has good repeatability, washing fastness, durability and high sensitivity performance.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The application of a sensitive material in a flexible vacuum pressure sensor is characterized in that the sensitive material is exposed to an atmospheric pressure environment, the sensitive material consists of a flexible substrate and a conductive nano material, and the sensitive material is an n-type semiconductor;
the flexible substrate is connected with the conductive nanomaterial by ultrasonic welding;
the flexible substrate is a flexible high polymer material with a glass transition temperature of less than 81 ℃, the conductive nano material is an MXene two-dimensional material, the surface layer of the MXene two-dimensional material lamellar nano sheet is provided with charge carriers, and the MXene two-dimensional material is used for adsorbing molecular gas on the surface layer to cause concentration change of the charge carriers of the surface layer to change the conductivity of the surface layer, so that the resistance value change responds to environments with different atmospheric pressures.
2. The use according to claim 1, wherein the flexible substrate is a nonwoven.
3. The use according to claim 1, wherein the flexible substrate has a thickness of 140 μm to 160 μm.
4. The use according to claim 1, wherein the method of preparing the sensitive material comprises the steps of:
immersing the flexible substrate in the dispersion liquid of the conductive nano material, and performing ultrasonic nano welding to obtain the sensitive material.
5. The use according to claim 4, wherein the flexible substrate is a pretreated flexible substrate, the pretreatment being in particular:
and (3) after ultrasonic cleaning of the flexible substrate, soaking the flexible substrate in isopropanol saturated solution, and drying the flexible substrate for later use.
6. The use according to claim 4, wherein the concentration of the conductive nanomaterial in the dispersion of the conductive nanomaterial is between 0.1 and 0.5mg/ml.
7. The use according to claim 4, wherein the preparation method of the dispersion of the conductive nanomaterial comprises:
and mixing the conductive nano material, the surfactant and the solvent, and then performing ultrasonic dispersion treatment to obtain a dispersion liquid of the conductive nano material.
8. The use according to claim 7, wherein the surfactant is sodium dodecyl sulfate or polyacrylamide.
9. The use according to claim 7, wherein the mass ratio of the conductive material to the surfactant is (5-10): 1.
10. the use according to claim 4, wherein the ultrasonic welding is carried out at a temperature of 0 ℃ for a time of 3 to 30 minutes, at a maximum output power of 2000W, at an amplitude of 60% and at a frequency of 20kHz.
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