Humidity-sensitive material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of humidity-sensitive materials, in particular to a humidity-sensitive material and a preparation method and application thereof. Imidazole ionic liquid is diffused into the perfluorosulfonic acid diaphragm structure material to form an ionic conduction network, and single-walled carbon nanotube electrodes communicated with the ionic conduction network are formed on the surfaces of the two sides of the modified perfluorosulfonic acid diaphragm structure material. The humidity-sensitive material has high sensitivity to humidity change by utilizing good conductivity and relatively high specific surface area of the single-walled carbon nanotubes and relatively good conductivity of the ionic conduction network and the perfluorosulfonic acid, so that the humidity-sensitive material has relatively good sensitivity. And the humidity-sensitive material is a flexible material and has good mechanical properties, so that the humidity-sensitive material is suitable for different application environments and has good service life, and therefore, the humidity-sensitive material can work in a high-humidity environment for a long time and has good stability, and the technical problem that the existing humidity-sensitive material is poor in sensitivity and stability is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of humidity-sensitive materials, and in particular to a humidity-sensitive material and a preparation method and application thereof. Background Art

[0002] Humidity-sensitive materials are materials that can respond to changes in ambient humidity and convert humidity changes into electrical signals, changes in resistance, changes in capacitance, or other measurable physical quantity changes. Humidity-sensitive materials are used in many fields such as the medical industry, warehousing and logistics, the automotive industry, and aerospace, and are mainly used for humidity measurement and control.

[0003] Disabled people refer to people whose ability to carry out daily activities is lost or restricted, and who are unable to carry out daily activities independently. If the excrement of disabled people cannot be handled in time, the disabled people will be in a high humidity environment for a long time, which will increase the possibility of disabled people suffering from bedsores. In daily life, the excrement of this group of people needs to be monitored in real time and handled in time to reduce the possibility of disabled people suffering from bedsores. The prior art proposes a monitoring system that uses a humidity sensor to monitor the excrement of disabled people to monitor the excretion of disabled people in real time.

[0004] The humidity-sensitive materials used to make humidity sensors are usually ceramic materials and electrolyte materials. Ceramic materials include alumina ceramics, which have the problem of poor sensitivity. Electrolyte materials include lithium chloride, which are easily polluted by the use environment, resulting in poor stability. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a humidity-sensitive material and a preparation method and application thereof, and solve the technical problems of poor sensitivity and stability of the existing humidity-sensitive materials.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The invention provides a method for preparing a humidity-sensitive material, which is characterized in that it comprises the following steps: immersing a perfluorosulfonic acid diaphragm structural material in an imidazole ionic liquid so that the imidazole ionic liquid diffuses into the perfluorosulfonic acid diaphragm structural material to form an ion conduction network, thereby obtaining a modified perfluorosulfonic acid diaphragm structural material; and forming single-walled carbon nanotube electrodes connected to the ion conduction network on both side surfaces of the modified perfluorosulfonic acid diaphragm structural material by a spraying method, thereby obtaining the humidity-sensitive material.

[0008] The present invention utilizes imidazole ionic liquid to diffuse into the perfluorosulfonic acid diaphragm structural material to form an ion conduction network, and forms single-walled carbon nanotube electrodes connected to the ion conduction network on both sides of the modified perfluorosulfonic acid diaphragm structural material. The good electrical conductivity and high specific surface area of ​​the single-walled carbon nanotubes, as well as the good electrical conductivity of the ion conduction network and perfluorosulfonic acid itself, make the humidity-sensitive material have a high degree of sensitivity to humidity changes, so that the humidity-sensitive material has good sensitivity. And because the humidity-sensitive material is a flexible material and has good mechanical properties, the humidity-sensitive material is suitable for different application environments and has a good service life, so that the humidity-sensitive material can work for a long time in a high humidity environment and has good stability, and then the humidity-sensitive material prepared by the present invention can solve the technical problems of poor sensitivity and stability of existing humidity-sensitive materials. In addition, the characteristic of the humidity-sensitive material generating an electrical response due to humidity changes does not require a complicated control circuit.

[0009] Optionally, the imidazolium ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate.

[0010] Optionally, the preparation method of the perfluorosulfonic acid diaphragm structural material includes the following steps: mixing perfluorosulfonic acid with a solvent, stirring evenly to obtain a membrane solution; placing the membrane solution in a mold, removing bubbles, and performing heat treatment and annealing to obtain a perfluorosulfonic acid diaphragm structural material; wherein the mass proportion of perfluorosulfonic acid in the membrane solution is 15% to 25%, and the thickness of the perfluorosulfonic acid diaphragm structural material is 60μm to 80μm.

[0011] Optionally, the specific operation method of the heat treatment is as follows: first heat to 65°C-75°C and keep warm for 9h-11h, then heat to 75°C-85°C and keep warm for 11h-13h, and finally heat to 115°C-125°C and keep warm for 1h-3h.

[0012] The above heat treatment operation method has the following advantages:

[0013] 1. Avoid bubble formation: If the temperature rises too quickly, the gas dissolved in the solvent will be released quickly to form bubbles, which will affect the uniformity and performance of the perfluorosulfonic acid diaphragm structural material.

[0014] 2. Controlling crystallinity: The performance of perfluorosulfonic acid diaphragm structural materials depends largely on their crystallinity. The above heat treatment operation method can help control the crystallization process of perfluorosulfonic acid diaphragm structural materials, thereby obtaining an ideal crystallinity, which is crucial for the mechanical strength and chemical stability of perfluorosulfonic acid diaphragm structural materials.

[0015] 3. Reduce thermal stress: Rapid temperature rise may generate thermal stress in the perfluorosulfonic acid diaphragm structural material, which may cause the perfluorosulfonic acid diaphragm structural material to crack or deform. The above heat treatment operation method can reduce this risk and make the perfluorosulfonic acid diaphragm structural material more stable during the heating process.

[0016] 4. Optimizing the microstructure of the perfluorosulfonic acid membrane structural material: The above-mentioned heat treatment operation method is helpful to optimize the microstructure of the perfluorosulfonic acid membrane structural material, such as pore size and distribution, which is very important for the ion conductivity and mechanical properties of the perfluorosulfonic acid membrane structural material.

[0017] Optionally, the method for forming single-walled carbon nanotube electrodes connected to the ion conduction network on both side surfaces of the modified perfluorosulfonic acid membrane structure material includes the following steps: mixing single-walled carbon nanotubes with ethanol, ultrasonically treating them in an ice-water bath to obtain a single-walled carbon nanotube dispersion; spraying the membrane solution on both side surfaces of the modified perfluorosulfonic acid membrane structure material, heating to remove the solvent, and forming an interface layer on both side surfaces of the modified perfluorosulfonic acid membrane structure material; spraying the single-walled carbon nanotube dispersion on the surface of the interface layer, heating to remove the solvent, and forming single-walled carbon nanotube electrodes connected to the ion conduction network on both side surfaces of the modified perfluorosulfonic acid membrane structure material to obtain a humidity-sensitive material; wherein the mass proportion of the single-walled carbon nanotubes in the single-walled carbon nanotube dispersion is 0.01% to 0.1%.

[0018] Among them, the purpose of the ice water bath is to provide a low temperature environment to reduce the risk of thermal damage to single-walled carbon nanotubes, reduce the degree of oxidation of single-walled carbon nanotubes, and make the single-walled carbon nanotubes uniformly dispersed in the single-walled carbon nanotube dispersion. First, single-walled carbon nanotubes may undergo thermal degradation or structural changes at high temperatures. The low temperature environment provided by the ice water bath can reduce the risk of thermal damage to single-walled carbon nanotubes caused by high temperatures. Secondly, single-walled carbon nanotubes may break and expose new surfaces during ultrasonic treatment. These surfaces are easily oxidized in the air. The low temperature ring provided by the ice water bath can inhibit the rate of oxidation reaction to reduce the degree of oxidation of single-walled carbon nanotubes. Finally, single-walled carbon nanotubes may aggregate due to van der Waals forces during ultrasonic treatment. The low temperature environment can reduce this aggregation and help obtain a more uniformly dispersed single-walled carbon nanotube dispersion.

[0019] Among them, before spraying the single-walled carbon nanotube dispersion, the purpose of spraying the membrane solution on the surfaces of both sides of the modified perfluorosulfonic acid diaphragm structural material is to form an interface layer between the single-walled carbon nanotube electrode and the modified perfluorosulfonic acid diaphragm structural material, so as to enhance the connection strength between the single-walled carbon nanotube electrode and the modified perfluorosulfonic acid diaphragm structural material.

[0020] Optionally, the solvent is dimethylacetamide and water.

[0021] Optionally, the annealing treatment conditions are: temperature of 140° C. to 160° C., and time of 25 min to 35 min.

[0022] The invention provides a humidity-sensitive material, which is prepared by the above-mentioned preparation method.

[0023] The present invention provides an application of the above-mentioned humidity sensitive material in preparing a humidity sensing unit or a device containing a humidity sensing unit.

[0024] The beneficial effect of the present invention is that, compared with the prior art, the present invention utilizes imidazole ionic liquid to diffuse into the perfluorosulfonic acid diaphragm structural material to form an ion conduction network, and forms single-walled carbon nanotube electrodes connected to the ion conduction network on both sides of the modified perfluorosulfonic acid diaphragm structural material. By utilizing the good electrical conductivity and high specific surface area of ​​the single-walled carbon nanotubes, as well as the good electrical conductivity of the ion conduction network and perfluorosulfonic acid itself, the hygroscopic material has a high sensitivity to humidity changes, so that the hygroscopic material has good sensitivity. And because the hygroscopic material is a flexible material and has good mechanical properties, the hygroscopic material is suitable for different application environments and has a good service life, so that the hygroscopic material can work for a long time in a high humidity environment and has good stability, thereby enabling the hygroscopic material prepared by the present invention to solve the technical problems of poor sensitivity and stability of existing hygroscopic materials. In addition, the characteristic of the hygroscopic material generating an electrical response due to humidity changes does not require a complicated control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a moisture-sensitive material provided by the present invention.

[0026] Figure 2 This is a scanning electron microscope image of a humidity-sensitive material provided by the present invention.

[0027] Figure 3 This is a scanning electron microscope image of a single-walled carbon nanotube electrode provided by the present invention.

[0028] Figure 4 A schematic diagram of the working state change of a testing device when a humidity-sensitive signal is generated in a humidity-sensitive performance test provided by the present invention.

[0029] Figure 5 A schematic diagram of the working state change of a test device when no humidity-sensitive signal is generated in a humidity-sensitive performance test provided by the present invention.

[0030] Figure 6 A circuit design diagram of a customized circuit board provided by the present invention.

[0031] Figure 7A diagram showing changes in working status during testing of an excrement monitoring system provided by the present invention. DETAILED DESCRIPTION

[0032] In order to solve the above technical problems, the present invention provides a humidity-sensitive material and a preparation method and application thereof. The technical scheme and embodiments of the present invention are now described in detail in conjunction with the accompanying drawings.

[0033] The present invention is described in detail below through specific examples. The examples are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] Figure 1 This is a structural schematic diagram of a humidity-sensitive material provided by the present invention, in which Nafion refers to perfluorosulfonic acid, Nafion layer refers to a modified perfluorosulfonic acid diaphragm structural material, SWCNTs refers to single-walled carbon nanotubes, and SWCNTelstriode refers to a single-walled carbon nanotube electrode.

[0035] like Figure 1 As shown, the humidity sensitive material of the present application has black parts on both sides as electrode layers, which are made by spraying single-walled carbon nanotubes, and the middle layer is a modified perfluorosulfonic acid diaphragm structure material doped with 1-ethyl-3-methylimidazole tetrafluoroborate.

[0036] The 1-ethyl-3-methylimidazolium tetrafluoroborate used in the specific examples is an ionic liquid with a purity of 99%, and the manufacturer is Shanghai Chengjie Chemical Co., Ltd.

[0037] Example 1

[0038] This embodiment provides a humidity-sensitive material, and the preparation method is as follows:

[0039] Step 1: Preparation of perfluorosulfonic acid diaphragm structural materials.

[0040] 1.25 g of perfluorosulfonic acid solution, 9.25 g of dimethylacetamide and 3.75 g of deionized water were mixed and stirred evenly to prepare a membrane solution, wherein the stirring time was 4 hours, and the mass proportion of perfluorosulfonic acid in the perfluorosulfonic acid solution was 20%.

[0041] 7.85g of the membrane solution was placed in a polytetrafluoroethylene mold of 5cm×5cm in size, and after defoaming in a vacuum defoaming tank, heat treatment and annealing were performed to obtain a perfluorosulfonic acid diaphragm structural material. The specific operation method of the heat treatment is as follows: first heat to 70°C and keep warm for 10h, then heat to 80°C and keep warm for 12h, and finally heat to 120°C and keep warm for 1h to 3h. The conditions for annealing treatment are: temperature of 150°C and time of 30min. The thickness of the perfluorosulfonic acid diaphragm structural material is 70μm.

[0042] Step 2: Preparation of modified perfluorosulfonic acid diaphragm structural materials.

[0043] The perfluorosulfonic acid diaphragm structural material is immersed in 0.25 g of 1-ethyl-3-methylimidazolium tetrafluoroborate, so that the 1-ethyl-3-methylimidazolium tetrafluoroborate diffuses into the perfluorosulfonic acid diaphragm structural material to form an ion conduction network, thereby obtaining a modified perfluorosulfonic acid diaphragm structural material.

[0044] By combining 1-ethyl-3-methylimidazolium tetrafluoroborate with a perfluorosulfonic acid diaphragm structural material, a modified perfluorosulfonic acid diaphragm structural material can be prepared. This method not only maintains the original excellent electrochemical properties of the perfluorosulfonic acid diaphragm structural material, but also improves the proton conductivity due to the addition of ionic liquids.

[0045] Step three: preparation of moisture-sensitive materials.

[0046] 8 mg of single-walled carbon nanotubes were mixed with 16 mL of ethanol and ultrasonically treated in an ice-water bath for 45 min to prepare a single-walled carbon nanotube dispersion.

[0047] 0.1 mL of the membrane solution was sprayed on both sides of the surface of the modified perfluorosulfonic acid diaphragm structural material with a size of 2 cm×1.5 cm, and heated to 120° C. to completely remove solvents such as dimethylacetamide, and to form an interface layer on both sides of the surface of the modified perfluorosulfonic acid diaphragm structural material.

[0048] The single-walled carbon nanotube dispersion is sprayed on the surface of the interface layer, heated to 80°C to remove ethanol, and single-walled carbon nanotube electrodes connected to the ion conduction network are formed on both sides of the modified perfluorosulfonic acid diaphragm structure material to obtain a humidity sensitive material.

[0049] Example 2

[0050] This embodiment provides a humidity-sensitive material, and the preparation method is as follows:

[0051] The preparation method of Example 1 is referred to, except that the mass proportion of perfluorosulfonic acid in the perfluorosulfonic acid solution in step 1 is changed to 15%.

[0052] Example 3

[0053] This embodiment provides a humidity-sensitive material, and the preparation method is as follows:

[0054] The preparation method of Example 1 is referred to, except that the mass proportion of perfluorosulfonic acid in the perfluorosulfonic acid solution in step 1 is changed to 25%.

[0055] Example 4

[0056] This embodiment provides a humidity-sensitive material, and the preparation method is as follows:

[0057] The preparation method of Example 1 is referred to, except that the thickness of the perfluorosulfonic acid diaphragm structural material in step 1 is changed to 60 μm.

[0058] Example 5

[0059] This embodiment provides a humidity-sensitive material, and the preparation method is as follows:

[0060] The preparation method of Example 1 is referred to, except that the thickness of the perfluorosulfonic acid diaphragm structural material in step 1 is changed to 80 μm.

[0061] Example 6

[0062] This embodiment provides a humidity-sensitive material, and the preparation method is as follows:

[0063] The preparation method of Example 1 is referred to, except that the thickness of the perfluorosulfonic acid diaphragm structural material in step 1 is changed to 80 μm.

[0064] Compared with the humidity sensitive material prepared in Example 1, the humidity sensitive properties of the humidity sensitive materials prepared in Examples 2 to 6 have no significant difference.

[0065] The present invention conducted the following tests on the prepared humidity-sensitive material:

[0066] Scanning electron microscope test:

[0067] Figure 2 This is a structural scanning electron microscope image of the humidity-sensitive material. The scanning electron microscope image of the material cross-section shows that the sandwich structure of electrode layer-modified perfluorosulfonic acid diaphragm structural material-electrode layer has an ideal composite effect. The electrode layer and the modified perfluorosulfonic acid diaphragm structural material are very tightly combined together, indicating that the single-walled carbon nanotube electrode and the modified perfluorosulfonic acid diaphragm structural material have excellent compatibility.

[0068] Figure 3 The SEM image of the network structure of the single-walled carbon nanotube electrode: The SEM image shows that the single-walled carbon nanotubes form an interconnected network structure, in which the individual nanotubes are closely arranged to form a conductive path. Specifically, the SEM image network structure of the single-walled carbon nanotube electrode has the following characteristics:

[0069] Tubular morphology: Each single-walled carbon nanotube appears as a slender tubular structure in the SEM image, with a diameter of usually around 1 to 2 nanometers and a length ranging from a few hundred nanometers to several micrometers. Smooth wall: The wall of a single-walled carbon nanotube is relatively smooth, with no obvious defects or impurities, showing good crystallinity.

[0070] Uniform distribution: In the SEM images, single-walled carbon nanotubes are evenly distributed throughout the electrode film, forming a uniform conductive layer.

[0071] Entanglement and crossing: Due to the flexibility of SWNTs, they may appear entangled and crossed with each other in SEM images, which helps to increase the overall mechanical strength of the electrode film.

[0072] No obvious aggregation: High-quality single-walled carbon nanotube electrode films usually do not have large aggregates in scanning electron microscope images, and the nanotubes are evenly dispersed, which is beneficial to improving the electrochemical performance of the electrode.

[0073] Surface roughness: Due to the stacking and arrangement of single-walled carbon nanotubes, the surface of the electrode film may have a certain degree of roughness, which helps to increase the contact area between the electrode and the electrolyte.

[0074] Junctions: In some cases, SEM images revealed junctions between single-walled carbon nanotubes, which are essential for forming a continuous conductive network.

[0075] Size consistency: High-quality SWNT electrode films show uniformly sized nanotubes in SEM images, which helps maintain consistent electrode performance.

[0076] No obvious damage: SEM images of single-walled carbon nanotube electrode films prepared under mild processing conditions usually do not show obvious damage or broken nanotubes.

[0077] Moisture sensitivity test:

[0078] like Figure 4 and Figure 5 As shown in the figure, the black part is the battery pack, the green part is the customized circuit board, and the cyan part is the test board for placing the test material. Figure 6 Circuit design diagram for custom circuit boards.

[0079] As shown in the figure, a test device is built using a battery pack, a custom circuit board and a test board, wherein the battery pack and the test board are electrically connected to the custom circuit board through wires, the battery pack provides power to the custom circuit board, the custom circuit board is provided with a control switch, a green indicator light, a red indicator light and a buzzer, and the test board is provided with a test area for placing test materials. When the test device is in normal standby mode, the green indicator light is always on, and the red indicator light and the buzzer are not working.

[0080] A blank control group, a moisture-sensitive material group, and a modified perfluorosulfonic acid diaphragm structure material group were set up respectively. Among them, no test material was placed in the test area of ​​the blank control group, the moisture-sensitive material prepared in Example 1 was placed in the test area of ​​the moisture-sensitive material group, and the modified perfluorosulfonic acid diaphragm structure material prepared in Example 1 was placed in the test area of ​​the modified perfluorosulfonic acid diaphragm structure material.

[0081] During the test, place the test material on the test area of ​​the test board, turn on the control switch, and observe the status of the green indicator light, red indicator light, and buzzer. If the green indicator light is always on and the red indicator light and buzzer are not working, it means that the test device is in standby mode and working normally. Use a dropper to add deionized water drop by drop to the surface of the test material or the test area. After each drop of deionized water, observe the status of the red indicator light and buzzer. When the test board generates a voltage change, the red indicator light and buzzer will work immediately, which is considered to be a successful generation of a moisture-sensitive signal. Otherwise, it is considered that the moisture-sensitive signal cannot be generated.

[0082] The test results are shown in Table 1:

[0083] Table 1 - Humidity Sensitivity Test Statistical Results

[0084] Green light status Red indicator light status Buzzer status Blank control group Always on Not working Not working Moisture Sensitive Materials Group Always on Work Work Modified perfluorosulfonic acid diaphragm structural material group Always on Not working Not working

[0085] The test results of the blank control group showed that no voltage signal could be generated when the humidity-sensitive material was not added to the test device, proving that the humidity-sensitive material played a necessary role in the test device. The test results of the humidity-sensitive material group showed that the humidity-sensitive material could generate a voltage signal when stimulated by a humidity signal, proving that the humidity-sensitive material had good humidity-sensitive properties. The experimental results of the modified perfluorosulfonic acid diaphragm structure material group showed that the modified perfluorosulfonic acid diaphragm structure material without the addition of single-walled carbon nanotubes could not be used as a humidity-sensitive material.

[0086] Fecal Monitoring System Test:

[0087] like Figure 7 As shown, an excrement monitoring system is improved and constructed based on the above-mentioned moisture-sensitive performance testing device, the test plate in the above-mentioned moisture-sensitive performance testing device is replaced with a commercially available diaper, and the moisture-sensitive material is embedded in the diaper.

[0088] The experimental results are as follows:

[0089] Description: Turn on the switch, the green indicator light comes on, and the circuit works normally. When a certain amount of deionized water is poured into the diaper implanted with ionic electroactive polymer, the moisture-sensitive material senses the humidity change, and the red indicator light and buzzer start to work. The demonstration effect shows that the system can achieve the effect of real-time monitoring of the excrement of disabled people.

[0090] In summary, the humidity sensitive material prepared by the present invention has good humidity sensitive performance, can solve the technical problems of poor sensitivity and stability of existing humidity sensitive materials, and can be successfully used in the preparation of humidity sensing units or devices containing humidity sensing units.

[0091] The above description is only a preferred embodiment of the present invention, and the above specific embodiment is not intended to limit the present invention. Various deformations and modifications may occur within the scope of the technical concept of the present invention, and any modification, modification or equivalent replacement made by a person of ordinary skill in the art based on the above description shall fall within the scope of protection of the present invention.

Claims

1. A method for preparing a humidity-sensitive material, characterized in that: The following steps are involved: The perfluorosulfonic acid diaphragm structural material is immersed in an imidazole ionic liquid, so that the imidazole ionic liquid diffuses into the perfluorosulfonic acid diaphragm structural material to form an ion conduction network, thereby obtaining a modified perfluorosulfonic acid diaphragm structural material; A single-walled carbon nanotube electrode connected to an ion conduction network is formed on both sides of a modified perfluorosulfonic acid diaphragm structural material by a spray coating method to obtain a humidity sensitive material.

2. The method for preparing a humidity-sensitive material according to claim 1, characterized in that: The imidazole ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate.

3. The method for preparing a humidity sensitive material according to claim 1 or 2, characterized in that: The preparation method of the perfluorosulfonic acid diaphragm structural material comprises the following steps: The perfluorosulfonic acid and the solvent are mixed and stirred uniformly to prepare a membrane solution; The membrane solution is placed in a mold, after degassing, heat treatment and annealing are performed to obtain a perfluorosulfonic acid diaphragm structural material; The mass proportion of perfluorosulfonic acid in the membrane solution is 15% to 25%, and the thickness of the perfluorosulfonic acid diaphragm structural material is 60 μm to 80 μm.

4. The method for preparing a humidity-sensitive material according to claim 3, characterized in that: The specific operation method of the heat treatment is as follows: First heat to 65℃~75℃ and keep warm for 9h~11h, then heat to 75℃~85℃ and keep warm for 11h~13h, and finally heat to 115℃~125℃ and keep warm for 1h~3h.

5. The method for preparing a humidity-sensitive material according to claim 3, characterized in that: The solvents are dimethylacetamide and water.

6. The method for preparing a humidity-sensitive material according to claim 3, characterized in that: The method for forming single-walled carbon nanotube electrodes connected to an ion conduction network on both sides of a modified perfluorosulfonic acid diaphragm structural material comprises the following steps: The single-walled carbon nanotubes are mixed with ethanol and subjected to ultrasonic treatment in an ice-water bath to prepare a single-walled carbon nanotube dispersion; The membrane solution is sprayed on both sides of the surface of the modified perfluorosulfonic acid diaphragm structural material, and after heating to remove the solvent, an interface layer is formed on both sides of the surface of the modified perfluorosulfonic acid diaphragm structural material; Spraying a single-walled carbon nanotube dispersion on the surface of the interface layer, heating to remove the solvent, and forming single-walled carbon nanotube electrodes connected to the ion conduction network on both sides of the modified perfluorosulfonic acid diaphragm structural material to obtain a humidity sensitive material; The mass proportion of the single-walled carbon nanotubes in the single-walled carbon nanotube dispersion is 0.01% to 0.1%.

7. The method for preparing a humidity-sensitive material according to claim 3, characterized in that: The conditions of the annealing treatment are: The temperature is 140℃~160℃, and the time is 25min~35min.

8. A moisture-sensitive material, characterized in that: The method is prepared according to any one of claims 1 to 7.

9. Use of the humidity sensitive material according to claim 8 in preparing a humidity sensing unit or a device containing a humidity sensing unit.

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