Preparation Method of a Graphene-Molybdenum Disulfide Composite Sponge Pressure Sensor

Abstract

The present invention relates to a preparation method of a graphene-molybdenum disulfide composite sponge pressure sensor, belonging to the technical field of flexible wearable devices. A preparation method of a graphene-molybdenum disulfide composite sponge pressure sensor comprises the following steps: S1, preparing a PDMS sponge; S2, preparing a graphene-molybdenum disulfide composite sponge; S3, adhering the graphene-molybdenum disulfide composite sponge to electrodes. After the electrodes are pasted on both sides of the graphene-molybdenum disulfide composite sponge, it is dried to obtain a graphene-molybdenum disulfide composite sponge pressure sensor. The graphene-molybdenum disulfide conductive sponge provided by the present invention improves the sensitivity and detection range of the flexible sensor.

Description

Technical Field

[0001] The present invention relates to a preparation method of a graphene-molybdenum disulfide composite sponge pressure sensor, belonging to the field of flexible wearable technology. Background Art

[0002] Due to advantages such as soft texture, comfortable wearing, and seamless fitting with the skin, flexible pressure sensors have broad application prospects in physiological signals such as limb movement, pulse, voice, and respiration, as well as health monitoring. In 2015, Samad et al. reported a two-step process using graphene oxide-coated polyurethane foam for low-strain and high-strain pressure sensors (Small 2015, 11, 2380-2385). In 2020, Li et al. studied highly sensitive, reliable, and flexible piezoresistive pressure sensors characterized by polyurethane sponges coated with MXene flakes. The sensor has a fast response (19 ms), can detect a wide range of deformations from 0% to 85% strain, and realizes a 3D sensor with a sensitivity of 0.015 kPa-1 (ACS Appl. Mater. Interfaces 2020, 12, 13316). However, there are still problems such as low sensitivity, narrow detection range, and complex preparation process, and it still cannot be widely used in health monitoring applications. Summary of the Invention

[0003] In order to overcome the above-mentioned problems of low sensitivity, narrow detection range, and complex preparation process, the present invention provides a preparation method of a graphene-molybdenum disulfide composite sponge pressure sensor.

[0004] A preparation method of a graphene-molybdenum disulfide composite sponge pressure sensor includes the following steps:

[0005] S1. Prepare a PDMS sponge: Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl), and a PDMS curing agent in proportion, stir well, then press into a sheet under a pressure of 300 kPa, heat and cure at 60 °C for 3 h, take it out and put it into water to wash until NaCl is completely dissolved to obtain a PDMS sponge;

[0006] S2. Prepare a graphene-molybdenum disulfide composite sponge: Disperse graphite powder and a dispersant in proportion in 500 mL of deionized water, exfoliate for 10 h, and place it in a freeze dryer for freeze drying (-60 °C, 48 h) to obtain graphene powder;

[0007] Ammonium tetrathiomolybdate powder and graphene powder are dispersed in 200 mL of deionized water in proportion, stirred evenly, and left standing for a period of time to obtain a mixed solution. The PDMS sponge is impregnated into the mixed solution and then hydrothermal reaction is carried out. After the hydrothermal reaction is completed, it is cooled, the reactants are taken out, washed and dried to obtain a graphene-molybdenum disulfide composite sponge;

[0008] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrodes. After the electrodes are pasted on both sides of the graphene-molybdenum disulfide composite sponge, it is dried to prepare a graphene-molybdenum disulfide composite sponge pressure sensor.

[0009] Further, in S1, the mass ratio of the PDMS, the NaCl and the curing agent is 5-10:10-30:1;

[0010] Further, in S2, the dispersant is one or more of methyl cellulose, sodium carboxymethyl cellulose, sodium hexadecyl benzene sulfonate, and poly(diallyldimethylammonium chloride);

[0011] Further, in S2, the mass ratio of the graphite powder to the dispersant is 5-10:1;

[0012] Further, in S2, the mass ratio of the graphene powder to the ammonium tetrathiomolybdate powder is 1-10:1;

[0013] Further, in S2, the temperature condition of the hydrothermal reaction is 150-300 °C, and the time condition is 12-24 h.

[0014] Further, in S3, the drying temperature condition is 60 °C, and the time condition is 1 h.

[0015] A graphene-molybdenum disulfide composite sponge pressure sensor is prepared by the above preparation method.

[0016] The present invention has the following beneficial effects compared with the prior art:

[0017] (1). The graphene-molybdenum disulfide conductive sponge provided by the present invention improves the sensitivity and detection range of the flexible sensor;

[0018] (2). Compared with the vacuum freeze-drying method and the chemical vapor deposition method, the sensor preparation method provided by the present invention uses the hydrothermal and soft template methods in a three-dimensional skeleton structure. This structure increases the surface roughness of the sensor, which is beneficial to improving the sensitivity of the sensor under low-pressure conditions. No additional equipment or chemical reagents are required, and the preparation process is simple and environmentally friendly, which is beneficial to large-scale preparation. Description of the Drawings

[0019] Figure 1 It is the electron microscope image of the pressure sensor prepared in Example 1 of the present invention. Specific implementation plan

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clear, the following will further describe the implementation methods of the present invention in conjunction with the accompanying drawings and examples.

[0021] The present invention provides a method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor, and a graphene-molybdenum disulfide composite sponge pressure sensor prepared by the method, wherein the preparation principle is as follows:

[0022] (1) Graphene has a high carrier mobility and provides high electrical conductivity. Graphene and molybdenum disulfide have two-dimensional piezoelectricity. When pressure is applied, the current generated in the graphene-molybdenum disulfide nanomaterial increases with the applied mechanical strain, thereby improving the sensitivity of the flexible pressure sensor. Molybdenum disulfide has excellent lubricity. During the application of pressure, the molybdenum disulfide nanosheets slip, thereby increasing the detection range of the flexible sensor. Therefore, graphene-molybdenum disulfide is selected as the sensitive material of the flexible sensor.

[0023] (12) PDMS sponge is lightweight, compressible, has excellent resilience, and has a three-dimensional support structure connected to each other through smaller pores. Therefore, we chose PDMS sponge as the flexible sensor substrate.

[0024] It should be noted that the polydimethylsiloxane (PDMS) and polydimethylsiloxane (PDMS) curing agent in the present invention are purchased from Dow Corning DC184 silicone rubber PDMS184 optical glue potting glue.

[0025] <Example 1>

[0026] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl) and polydimethylsiloxane (PDMS) curing agent in a mass ratio of 10:30:1, stir thoroughly, press into sheets at a pressure of 300 kPa, heat and cure at 60°C for 3 h, take out and wash in water until NaCl is completely dissolved, to obtain a PDMS sponge;

[0027] S2, dispersing graphite powder and polydiallyldimethylammonium chloride in 500 mL of deionized water at a mass ratio of 10:1, peeling for 10 h, placing in a freeze dryer for freeze drying (-60 ° C, 48 h), to obtain graphene powder;

[0028] Weigh 0.2 g of graphene powder and 0.2 g of ammonium tetrathiomolybdate powder respectively with a mass ratio of 1:1; dissolve the taken ammonium tetrathiomolybdate powder in 200 mL of deionized water, form the first mixed solution, stir for 1 h at a rotation speed of 500 rpm, and disperse evenly; add the taken graphene powder into the stirred first mixed solution, form the second mixed solution, stir for 1 h at a rotation speed of 500 rpm, and disperse evenly; pour the PDMS sponge and the stirred second mixed solution into a stainless-steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210 °C, 24 h). After the hydrothermal reaction is completed, wait for the solution to cool naturally to room temperature, take out the reactants, then wash the reactants 3 times with deionized water and ethanol, and dry them to obtain the graphene-molybdenum disulfide composite sponge.

[0029] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrodes. After pasting the electrodes on both sides of the graphene-molybdenum disulfide composite sponge, transfer it to a drying oven, dry it at 60 °C for 1 h, and then take it out to obtain the graphene-molybdenum disulfide composite sponge pressure sensor.

[0030] The structure of the pressure sensor prepared in this example is as Figure 1 shown. It can be seen from Figure 1 that the pressure sensor prepared in this example has a corn cob structure with a three-dimensional structure where the graphene-coated sponge skeleton and molybdenum disulfide nanospheres are interspersed between the graphene and the sponge skeleton.

[0031] <Example 2>

[0032] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl), and a PDMS curing agent in a mass ratio of 10:30:1, stir well, then press into tablets under a pressure of 300 kPa, heat and cure at 60 °C for 3 h, take it out and put it into water to wash until NaCl is completely dissolved to obtain the PDMS sponge;

[0033] S2. Disperse graphite powder and poly(diallyldimethylammonium chloride) with a mass ratio of 10:1 in 500 mL of deionized water, exfoliate for 10 h, and place it in a freeze dryer for freeze drying (-60 °C, 48 h) to obtain graphene powder;

[0034] 0.4g of graphene powder and 0.2g of ammonium tetrathiomolybdate powder were weighed at a mass ratio of 2:1; the ammonium tetrathiomolybdate powder was dissolved in 200mL of deionized water, and after forming the first mixed solution, it was stirred at a speed of 500rpm for 1h and dispersed evenly; the graphene powder was added to the first mixed solution after stirring, and after forming the second mixed solution, it was stirred at a speed of 500rpm for 1h and dispersed evenly; the PDMS sponge and the stirred second mixed solution were poured into a stainless steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210℃, 24h). After the hydrothermal reaction, the solution was cooled to room temperature naturally, the reactant was taken out, and then the reactant was washed 3 times with deionized water and ethanol, and then dried to obtain a graphene-molybdenum disulfide composite sponge.

[0035] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrode so that the electrode is attached to both sides of the graphene-molybdenum disulfide composite sponge, transfer it to a drying oven and dry it at 60° C. for 1 hour, then take it out to obtain a graphene-molybdenum disulfide composite sponge pressure sensor.

[0036] <Example 3>

[0037] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl) and polydimethylsiloxane (PDMS) curing agent in a mass ratio of 10:30:1, stir thoroughly, press into sheets at a pressure of 300 kPa, heat and cure at 60° C. for 3 h, take out and wash in water until NaCl is completely dissolved, to obtain a PDMS sponge;

[0038] S2, dispersing graphite powder and polydiallyldimethylammonium chloride in 500 mL of deionized water at a mass ratio of 10:1, peeling for 10 h, placing in a freeze dryer for freeze drying (-60 ° C, 48 h), to obtain graphene powder;

[0039] 1g of graphene powder and 0.2g of ammonium tetrathiomolybdate powder were weighed at a mass ratio of 5:1; the ammonium tetrathiomolybdate powder was dissolved in 200mL of deionized water to form a first mixed solution, and then stirred at a speed of 500rpm for 1h to disperse evenly; the graphene powder was added to the first mixed solution after stirring, and after forming a second mixed solution, it was stirred at a speed of 500rpm for 1h to disperse evenly; the PDMS sponge and the stirred second mixed solution were poured into a stainless steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210℃, 24h). After the hydrothermal reaction, the solution was cooled to room temperature naturally, the reactant was taken out, and then the reactant was washed 3 times with deionized water and ethanol, and then dried to obtain a graphene-molybdenum disulfide composite sponge.

[0040] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrode so that the electrode is attached to both sides of the graphene-molybdenum disulfide composite sponge, transfer it to a drying oven and dry it at 60° C. for 1 hour, then take it out to obtain a graphene-molybdenum disulfide composite sponge pressure sensor.

[0041] <Example 4>

[0042] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl) and polydimethylsiloxane (PDMS) curing agent in a mass ratio of 10:30:1, stir thoroughly, press into sheets at a pressure of 300 kPa, heat and cure at 60° C. for 3 h, take out and wash in water until NaCl is completely dissolved, to obtain a PDMS sponge;

[0043] S2, dispersing graphite powder and polydiallyldimethylammonium chloride in 500 mL of deionized water at a mass ratio of 10:1, peeling for 10 h, placing in a freeze dryer for freeze drying (-60 ° C, 48 h), to obtain graphene powder;

[0044] 2g of graphene powder and 0.2g of ammonium tetrathiomolybdate powder were weighed at a mass ratio of 10:1; the ammonium tetrathiomolybdate powder was dissolved in 200mL of deionized water to form a first mixed solution, and then stirred at a speed of 500rpm for 1h to disperse evenly; the graphene powder was added to the first mixed solution after stirring, and after forming a second mixed solution, it was stirred at a speed of 500rpm for 1h to disperse evenly; the PDMS sponge and the stirred second mixed solution were poured into a stainless steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210℃, 24h). After the hydrothermal reaction, the solution was cooled to room temperature naturally, the reactant was taken out, and then the reactant was washed 3 times with deionized water and ethanol, and then dried to obtain a graphene-molybdenum disulfide composite sponge.

[0045] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrode so that the electrode is attached to both sides of the graphene-molybdenum disulfide composite sponge, transfer it to a drying oven and dry it at 60° C. for 1 hour, then take it out to obtain a graphene-molybdenum disulfide composite sponge pressure sensor.

[0046] <Example 5>

[0047] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl) and polydimethylsiloxane (PDMS) curing agent in a mass ratio of 5:10:1, stir thoroughly, press into sheets at a pressure of 300 kPa, heat and cure at 60° C. for 3 h, take out and wash in water until NaCl is completely dissolved, to obtain a PDMS sponge;

[0048] S2. Disperse graphite powder and poly(diallyldimethylammonium chloride) in 500 mL of deionized water at a mass ratio of 10:1, exfoliate for 10 h, and place it in a freeze dryer for freeze drying (-60 °C, 48 h) to obtain graphene powder;

[0049] Weigh 1 g of graphene powder and 0.2 g of ammonium tetrathiomolybdate powder at a mass ratio of 5:1 respectively; dissolve the weighed ammonium tetrathiomolybdate powder in 200 mL of deionized water to form a first mixed solution, then stir at a speed of 500 rpm for 1 h to disperse evenly; add the weighed graphene powder to the stirred first mixed solution to form a second mixed solution, and then stir at a speed of 500 rpm for 1 h to disperse evenly; pour the PDMS sponge and the stirred second mixed solution into a stainless steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210 °C, 24 h). After the hydrothermal reaction is completed, wait for the solution to cool naturally to room temperature, take out the reactants, then wash the reactants 3 times with deionized water and ethanol, and dry them to obtain a graphene-molybdenum disulfide composite sponge.

[0050] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrodes. After pasting the electrodes on both sides of the graphene-molybdenum disulfide composite sponge, transfer it to a drying oven and dry it at 60 °C for 1 h, and then take it out to obtain a graphene-molybdenum disulfide composite sponge pressure sensor.

[0051] <Example 6>

[0052] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl), and a PDMS curing agent in a mass ratio of 10:30:1, stir well, then press into tablets under a pressure of 300 kPa in sequence, heat and cure at 60 °C for 3 h, take it out and put it in water to wash until NaCl is completely dissolved to obtain a PDMS sponge;

[0053] S2. Disperse graphite powder and poly(diallyldimethylammonium chloride) in 500 mL of deionized water at a mass ratio of 5:1, exfoliate for 10 h, and place it in a freeze dryer for freeze drying (-60 °C, 48 h) to obtain graphene powder;

[0054] Weigh 1 g of graphene powder and 0.2 g of ammonium tetrathiomolybdate powder respectively at a mass ratio of 5:1; dissolve the taken ammonium tetrathiomolybdate powder in 200 mL of deionized water, after forming a first mixed solution, stir it at a rotation speed of 500 rpm for 1 h to disperse evenly; add the taken graphene powder into the stirred first mixed solution, after forming a second mixed solution, stir it at a rotation speed of 500 rpm for 1 h to disperse evenly; pour the PDMS sponge and the stirred second mixed solution into a stainless-steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210 °C, 24 h). After the hydrothermal reaction ends, wait for the solution to cool naturally to room temperature, take out the reactants, then wash the reactants 3 times with deionized water and ethanol, and dry them to obtain a graphene-molybdenum disulfide composite sponge.

[0055] S3. Adhere the graphene-molybdenum disulfide composite sponge to the electrodes. After pasting the electrodes on both sides of the graphene-molybdenum disulfide composite sponge, transfer it to a drying oven and dry it at a temperature of 60 °C for 1 h, then take it out to obtain a graphene-molybdenum disulfide composite sponge pressure sensor.

[0056] <Comparative Example 1>

[0057] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl) and a polydimethylsiloxane (PDMS) curing agent in a mass ratio of 10:30:1, stir well, then press it into tablets under a pressure of 300 kPa in sequence, heat and cure it at 60 °C for 3 h, take it out and put it into water to wash until NaCl is completely dissolved to obtain a PDMS sponge;

[0058] S2. Disperse graphite powder and poly(diallyldimethylammonium chloride) in 500 mL of deionized water at a mass ratio of 10:1, exfoliate for 10 h, and place it in a freeze dryer for freeze drying (-60 °C, 48 h) to obtain graphene powder;

[0059] Weigh 1 g of graphene powder and 0.2 g of carbon nanotube powder respectively at a mass ratio of 5:1; dissolve the taken carbon nanotube powder in 200 mL of deionized water, after forming a first mixed solution, stir it at a rotation speed of 500 rpm for 1 h to disperse evenly; add the taken graphene powder into the stirred first mixed solution, after forming a second mixed solution, stir it at a rotation speed of 500 rpm for 1 h to disperse evenly; pour the PDMS sponge and the stirred second mixed solution into a stainless-steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210 °C, 24 h). After the hydrothermal reaction ends, wait for the solution to cool naturally to room temperature, take out the reactants, then wash the reactants 3 times with deionized water and ethanol, and dry them to obtain a graphene-carbon nanotube composite sponge.

[0060] S3. Adhere the dried graphene-carbon nanotube composite sponge to the electrode so that the electrode is attached to both sides of the graphene-carbon nanotube, transfer it to a drying oven and dry it at 60° C. for 1 hour, then take it out to obtain a graphene-carbon nanotube composite sponge pressure sensor.

[0061] <Comparative Example 2>

[0062] S1. Mix polydimethylsiloxane (PDMS), sodium chloride (NaCl) and polydimethylsiloxane (PDMS) curing agent in a mass ratio of 10:30:1, stir thoroughly, press into sheets at a pressure of 300 kPa, heat and cure at 60° C. for 3 h, take out and wash in water until NaCl is completely dissolved, to obtain a PDMS sponge;

[0063] S2, dispersing graphite powder and polydiallyldimethylammonium chloride in 500 mL of deionized water at a mass ratio of 10:1, peeling for 10 h, placing in a freeze dryer for freeze drying (-60 ° C, 48 h), to obtain graphene powder;

[0064] 1g of graphene powder and 0.2g of MXene powder were weighed at a mass ratio of 5:1; the MXene powder was dissolved in 200mL of deionized water to form a first mixed solution, and then stirred at a speed of 500rpm for 1h to disperse evenly; the graphene powder was added to the stirred first mixed solution to form a second mixed solution, and then stirred at a speed of 500rpm for 1h to disperse evenly; the PDMS sponge and the stirred second mixed solution were poured into a stainless steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction (210℃, 24h). After the hydrothermal reaction, the solution was cooled naturally to room temperature, the reactant was taken out, and then the reactant was washed 3 times with deionized water and ethanol, and then dried to obtain a graphene-MXene composite sponge.

[0065] S3. Adhere the graphene-MXene composite sponge to the electrode so that the electrode is attached to both sides of the graphene-MXene composite sponge, transfer it to a drying oven and dry it at 60° C. for 1 hour, then take it out to obtain a graphene-MXene composite sponge pressure sensor.

[0066] The pressure sensors prepared in Examples 1-6 and Comparative Examples 1-2 were tested for sensitivity, response time, working range, cycle performance, etc. using a TC-DLJ-PC electronic universal testing machine produced by Jinan Taichang Yiqi Co., Ltd. The test results are shown in Table 1. It should be noted that the test methods for testing the performance of sensitivity, response time, working range, cycle performance, etc. in the present invention are all prior art.

[0067] Table 1 Comparison of sensor performance in various embodiments

[0068]

[0069]

[0070] As can be seen from Table 1, the pressure detection capabilities of Examples 1 - 6 are greater than those of the samples of Comparative Examples 1 - 2. Among them, Example 3 has the highest sensitivity under the pressure of 0 - 1500 kPa and can respond quickly to the applied pressure. The best experimental conditions are explored. When the doping amount of molybdenum disulfide is too high, the hardness of the graphene - molybdenum disulfide sponge is too high, reducing the sensor sensitivity, response time, working range, and cycling performance; when the doping amount of molybdenum disulfide is too low, the graphene - molybdenum disulfide does not have two - dimensional piezoelectricity, reducing the sensor sensitivity, response time, working range, and cycling performance. When the mass ratio of PDMS, NaCl, and curing agent is too low, a complete three - dimensional structure cannot be formed, reducing the sensor sensitivity, response time, working range, and cycling performance. When the mass ratio of graphene and dispersant is too low, a large number of highly conductive graphene nanosheets cannot be exfoliated, reducing the sensor sensitivity, response time, working range, and cycling performance. Under the condition of the best mass ratio, the graphene - molybdenum disulfide composite sponge exhibits excellent two - dimensional piezoelectricity, forming a unique millet - rod structure on the three - dimensional structure sponge framework, improving the sensor sensitivity, response time, working range, and cycling performance.

[0071] Without conflict, the features in the above - mentioned embodiments in this article can be combined with each other.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor, It is characterized in that The following steps are involved: S1. Prepare PDMS sponge: mix polydimethylsiloxane, sodium chloride and polydimethylsiloxane curing agent in proportion, stir them thoroughly, press them into sheets and heat and cure them in sequence, then take them out and wash them until the sodium chloride is completely dissolved to obtain a PDMS sponge; S2. preparing a graphene-molybdenum disulfide composite sponge: dispersing graphite powder and a dispersant in deionized water in proportion, peeling, freezing, and drying to obtain graphene powder; The ammonium tetrathiomolybdate powder and the graphene powder are dispersed in deionized water in proportion, stirred evenly, and allowed to stand for a period of time to obtain a mixed solution, and the PDMS sponge is immersed in the mixed solution and subjected to a hydrothermal reaction. After the hydrothermal reaction is completed, the mixture is cooled, the reactant is taken out, the reactant is washed and dried, and a graphene-molybdenum disulfide composite sponge is obtained; S3, adhering the graphene-molybdenum disulfide composite sponge to the electrodes, so that the electrodes are adhered to both sides of the graphene-molybdenum disulfide composite sponge, and then drying to obtain a graphene-molybdenum disulfide composite sponge pressure sensor.

2. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor according to claim 1, It is characterized in that In S1, the mass ratio of the polydimethylsiloxane, the sodium chloride and the polydimethylsiloxane curing agent is 5 to 10:10 to 30:

1.

3. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor according to claim 1, It is characterized in that In S2, the dispersant is one or more of methyl cellulose, sodium carboxymethyl cellulose, sodium hexadecylbenzene sulfonate, and polydiallyldimethylammonium chloride.

4. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor according to claim 1, It is characterized in that In S2, the mass ratio of the graphite powder to the dispersant is 5 to 10:

1.

5. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor according to claim 1, It is characterized in that In S2, the mass ratio of the graphene powder to the ammonium tetrathiomolybdate powder is 1 to 10:

1.

6. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor according to claim 1, It is characterized in that In S2, the temperature condition of the hydrothermal reaction is 150-300°C, and the time condition is 12-24h.

7. A method for preparing a graphene-molybdenum disulfide composite sponge pressure sensor according to claim 1, It is characterized in that In S3, the drying temperature is 60°C and the drying time is 1 hour.

8. A graphene-molybdenum disulfide composite sponge pressure sensor, It is characterized in that Prepared according to any one of claims 1 to 7.

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