Preparation method and application of light-driven hydrogel dual-mode sensor

Abstract

The invention relates to the field of flexible sensing, and discloses a preparation method and application of a light-driven hydrogel dual-mode sensor, and the preparation method comprises the following steps: (1) preparing a driving piezoresistive layer; (2) preparing a piezoelectric layer film; and (3) preparation of the light-driven hydrogel dual-mode sensor: embedding the piezoelectric layer film into the driving piezoresistive layer, injecting an AM solution, and performing ultraviolet radiation for crosslinking to obtain the light-driven hydrogel dual-mode sensor. The dual-mode sensor based on the light-driven hydrogel successfully realizes integration of driving / sensing dual functions, further introduces a multi-mode sensing capability, has a multi-dimensional information sensing capability, simultaneously has two modes of piezoelectric sensing and piezoresistive sensing, and has a wide application prospect. The mechanical property, the driving performance, the photo-thermal performance and the light driving performance are good, and the material can be applied to the aspects of bionic octopus, intelligent underwater robots, bionic hunting and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible sensing, and specifically to a preparation method and application of a dual-mode sensor of a light-driven hydrogel. Background Art

[0002] In recent years, biological systems have continuously evolved, forming various complex and delicate regulatory mechanisms to sense and respond to changes in the external environment. Take the mussel, an aquatic mollusk, for example. There are many temperature sensors distributed on its body surface. These sensors, like sensitive "little sentinels", can accurately sense the changes in the surrounding water temperature and quickly transmit the temperature information to the mussel's nervous system, prompting the mussel to make corresponding responses. When the water temperature drops, the mussel enters an "energy-saving mode", reduces its own activities, and lowers its metabolic rate to reduce energy consumption. At the same time, it may also move towards the warmer area at the bottom of the water to actively seek a more suitable living environment. When the water temperature rises, the mussel will increase its breathing rate to strive for more oxygen to meet its metabolic needs, and will also prevent the imbalance of body water caused by the water temperature change by adjusting the osmotic pressure in its body. Cephalopods, such as octopuses, exhibit a unique distributed sensory-motor control system. They have non-segmented arms that can not only sense their own movements (i.e., proprioception) but also keenly detect external tactile stimuli. The powerful ability of these organisms to sense external stimuli and flexibly manage their own movements to adapt to the environment provides a new paradigm for the development of bio-sensing and driving devices and inspires the innovative ideas of scientific researchers. However, to imitate this biological somatosensory system and achieve active movement and sensing functions, the key lies in the effective integration of sensors and actuators.

[0003] Traditional rigid robots have many limitations and perform poorly in terms of adaptability, interactivity, and safety. These deficiencies are fully exposed in many practical tasks. For example, when interacting with humans in a medical care scenario, it is difficult to be safe and natural; when performing search and rescue tasks in an unstructured obstacle environment, it lacks flexibility; and when carrying out underwater exploration tasks, it also faces many challenges. The emergence of soft robots, like a ray of dawn, brings hope for making up for these shortcomings of rigid robots. In recent years, soft actuators have rapidly emerged as a popular emerging research topic, and researchers are committed to narrowing the gap between machines and biological organisms through them. Different from traditional rigid robot systems, soft actuators are made of soft and deformable materials, which endows them with unique advantages. It can actively or passively change its shape, thus flexibly manipulating objects, completing various dexterous movements, and can also autonomously adapt to the surrounding environment. With its inherent structural compliance and multiple degrees of freedom, soft actuators have been developed and applied in many fields, such as artificial muscles, soft grippers, wearable devices, and medical rehabilitation devices. However, despite the remarkable progress made in the field of soft robots, due to the extreme complexity of biological systems, it is still a highly challenging task to fully replicate the performance of biological actuators. The sensor is judged by a piezoelectric sensing element. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a preparation method and application of a dual-mode sensor of a light-driven hydrogel, including a piezoresistive sensor and a piezoelectric sensor. By applying the special design structure of the dual-mode sensor of the light-driven hydrogel in bionic hunting, the sensor uses a photothermal material as the switch for bionic hunting and the regulator for the angle of the gripper during hunting to carry out hunting. The sensor uses a piezoresistive sensing element to detect the large dynamic pressure during hunting, and a piezoelectric sensor to detect the small pressure during hunting.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A preparation method of a dual-mode sensor of a light-driven hydrogel, including the following steps:

[0006] Step 1. Preparation of the piezoresistive layer PNA / PVA / MXene composite hydrogel: Add 10 g of polyvinyl alcohol (PVA) to 90 mL of deionized water, heat and stir in a water bath at 95 °C for 3 h until completely dissolved to obtain a clear and transparent 10% PVA solution for later use. (1) Prepare the hydrogel precursor solution: Add 5 mg of N,N'-methylenebisacrylamide (BIS), 1 g of N-isopropylacrylamide (NIPAM), 100 mg of acrylamide (AM), 1 mL of the 10% PVA solution, and 25 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173) to 2.2 mL of deionized water, stir evenly to obtain a clear and transparent solution, and then add 500 μL of a 5 mg / mL MXene aqueous dispersion and stir evenly to obtain the hydrogel precursor solution. Stir the whole process in the dark. (2) Mold injection: The mold is composed of two glass slides (60 mm × 25 mm) sandwiching a silicone gasket with a hollowed-out area of 40 mm × 10 mm × 1.5 mm. Inject the hydrogel precursor solution into the above mold, and avoid generating bubbles during the injection process. (3) Crosslinking: Place the molded mold in an 18 °C water bath 15 cm below a UV lamp (λ = 365 nm, 250 W) and irradiate for 20 min. After curing, demold to obtain the hydrogel, rinse it repeatedly with deionized water to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment for later use.

[0007] Step 2. Preparation of the piezoelectric layer P(VDF-TrFE) / BTO piezoelectric thin film: Dissolve 1 g of P(VDF-TrFE) powder and 0.1 g of barium titanate (BaTiO3) in 8.9 g of N,N-dimethylformamide (DMF), then place the mixed solution in a water bath at 60 °C, heat and stir for 5 h until completely dissolved to obtain a white and uniform solution. Drop the solution into a polytetrafluoroethylene mold with a size of 50 mm * 50 mm * 1 mm, scrape it flat, and then place it in an oven at 60 °C to dry for 1 h. After demolding, perform an annealing treatment in a muffle furnace at 120 °C for 2 h to improve the crystallinity. Place the annealed piezoelectric thin film in a silicone oil bath, polarize it at a voltage of 0.5 KV for 30 min, then raise the voltage to 0.8 KV and polarize for 1 h, and finally raise the voltage to 1 KV and polarize for 30 min. Then take out the piezoelectric thin film and rinse the residual silicone oil on the surface with ethanol.

[0008] Step 3: Preparation of the drive-sensing integrated intelligent hydrogel. (1) Prepare the acrylamide prepolymer solution: Add 20 mg of N,N'-methylenebisacrylamide (BIS), 100 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and 5 g of acrylamide (AM) to 20 ml of deionized water and stir evenly to obtain a clear and transparent solution. (2) Place the obtained PNIPAM / AM / MXene composite hydrogel on a glass slide as the bottom layer, place a P(VDF-TrFE) piezoelectric film on top, use a 40 mm×10 mm×1 mm silicone gasket and place it above the original 40 mm×10 mm×1 mm silicone gasket to make the two silicone gaskets coincide, clamp the mold with a glass slide, inject the prepared AM solution, place the injection-molded mold under ultraviolet light for 20 min for polymerization, demold after curing to obtain the hydrogel, rinse it repeatedly with deionized water to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment for later use.

[0009] Preferably, the parameters of the silicone oil bath in Step 2 are set as follows: Polarize for 30 min at a voltage of 0.5 KV, then raise the voltage to 0.8 KV and polarize for 1 h, and finally raise the voltage to 1 KV and polarize for 30 min.

[0010] Preferably, the size of the silicone gasket in Step 3 is 40 mm×10 mm×1 mm, and the light irradiation time parameter under ultraviolet light is 20 min.

[0011] Furthermore, the dual-mode sensor based on the light-driven hydrogel is applied in bionic hunting.

[0012] Furthermore, the dual-mode sensor based on the light-driven hydrogel introduces a piezoelectric sensing mode to make up for the information acquisition limitation of the single piezoresistive sensing mode in bending deformation.

[0013] Furthermore, the dual-mode sensor based on the light-driven hydrogel is used to detect static signals and dynamic signals respectively. The dual-mode sensor can collect information on the bending angle, bending rate, and bending direction during the bending process and simulate the actual bending process, demonstrating excellent in vitro sensing ability.

[0014] Furthermore, under near-infrared light irradiation, the dual-mode sensor can bend and grasp an object, and in the process, it can feedback piezoresistive and piezoelectric signals in real time. Based on the piezoresistive mode of proprioception, it realizes the multi-dimensional information sensing ability during the autonomous driving process.

[0015] The present invention provides a preparation method and application of a dual-mode sensor of a light-driven hydrogel. It has the following beneficial effects:

[0016] 1. The dual-mode sensor based on photo-driven hydrogel of the present invention successfully realizes the integrated integration of the driving / sensing dual functions, and further introduces multi-mode sensing capabilities, enabling it to have multi-dimensional information perception capabilities.

[0017] 2. Regarding the dual-mode sensor based on photo-driven hydrogel of the present invention, it is found that in terms of bending performance, under near-infrared light irradiation, the sensor can bend and grasp objects, and the piezoresistive and piezoelectric sensing signals fed back in real time during this process achieve self-driving.

[0018] 3. By preparing the PNIPAM and MXene-doped piezoresistive layer hydrogel sensor of the present invention, the repeatability of the hydrogel sensor is enhanced. The hydrogel sensor still maintains a stable output signal during the repeated loading-unloading cyclic stretching process under different strains, indicating its good repeatability.

[0019] 4. The MXene-doped piezoresistive layer hydrogel sensor of the present invention has a fast response ability.

[0020] 5. The sensing characteristics of the piezoelectric layer P(VDF-TrFE) / BTO piezoelectric thin film of the present invention also perform excellently under different force values. Description of the Drawings

[0021] Figure 1 It is a signal acquisition diagram of the repeatability of the hydrogel sensor of the present invention;

[0022] Figure 2 It is a diagram for collecting the variation law of the relative resistance during the step-by-step loading-unloading process of the hydrogel sensor of the present invention;

[0023] Figure 3 It is a response time acquisition diagram of the hydrogel sensor of the present invention;

[0024] Figure 4 It is a curve diagram showing the change of the resistance of the hydrogel sensor of the present invention with the bending angle;

[0025] Figure 5 It is a signal acquisition diagram of the response ability of the prepared PNIPAM and MXene-doped piezohydrogel sensor of the present invention;

[0026] Figure 6 It is a signal acquisition diagram of the resistance of the hydrogel sensor of the present invention with the bending angle;

[0027] Figure 7 It is a flow chart of the preparation method of the present invention. Detailed Embodiments

[0028] Next, in combination with the accompanying drawings of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1:

[0030] Please refer to the attached Figure 1 - attached Figure 7 , the embodiment of the present invention provides a preparation method for a dual-mode sensor of a light-driven hydrogel, including the following steps:

[0031] Step 1: Preparation of the driving piezoresistive layer PNA / PVA / MXene composite hydrogel. Add 10 g of polyvinyl alcohol (PVA) to 90 mL of deionized water, heat and stir in a water bath at 95 °C for 3 h until completely dissolved to obtain a clear and transparent 10% PVA solution for later use. (1) Prepare the hydrogel precursor solution: Add 5 mg of N,N'-methylenebisacrylamide (BIS), 1 g of N-isopropylacrylamide (NIPAM), 100 mg of acrylamide (AM), 1 mL of 10% PVA solution, and 25 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173) to 2.2 ml of deionized water and stir evenly to obtain a clear and transparent solution. Then add 500 μL of 5 mg / mL MXene aqueous dispersion and stir evenly to obtain the hydrogel precursor solution. Stir in the dark throughout the process. (2) Mold injection: The mold is composed of two glass slides (60 mm × 25 mm) sandwiching a silicone gasket with a hollowed-out area of 40 mm × 10 mm × 1.5 mm in the middle. Inject the hydrogel precursor solution into the above mold, and avoid generating bubbles during the injection process. (3) Crosslinking: Place the molded mold in an 18 °C water bath 15 cm below a UV lamp (λ = 365 nm, 250 W) and irradiate for 20 min. Demold after curing to obtain the hydrogel, repeatedly rinse with deionized water to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment for later use.

[0032] Step 2: Preparation of the piezoelectric layer P(VDF-TrFE) / BTO piezoelectric thin film. Dissolve 1 g of P(VDF-TrFE) powder and 0.1 g of barium titanate (BaTiO3) in 8.9 g of N,N-dimethylformamide (DMF), and then place the mixed solution in a water bath at 60 °C and heat and stir for 5 h until completely dissolved to obtain a white homogeneous solution. Drop the solution onto a polytetrafluoroethylene mold with a size of 50 mm * 50 mm * 1 mm, scrape it flat, and then place it in an oven at 60 °C to dry for 1 h. After demolding, perform an annealing treatment in a muffle furnace at 120 °C for 2 h to improve the crystallinity. Place the annealed piezoelectric thin film in a silicone oil bath, polarize it at a voltage of 0.5 kV for 30 min, then raise the voltage to 0.8 kV and polarize for 1 h, and finally raise the voltage to 1 kV and polarize for 30 min. Then take out the piezoelectric thin film and rinse the surface residual silicone oil with ethanol.

[0033] Step 3: Preparation of the drive-sensing integrated intelligent hydrogel. (1) Prepare the acrylamide prepolymer solution: Add 20 mg of N,N'-methylenebisacrylamide (BIS), 100 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and 5 g of acrylamide (AM) to 20 ml of deionized water and stir evenly to obtain a clear and transparent solution. (2) Place the obtained PNIPAM / AM / MXene composite hydrogel on a glass sheet as the bottom layer, place the P(VDF-TrFE) piezoelectric thin film on top, use a silicone gasket with a size of 40 mm × 10 mm × 1 mm and place it above the original silicone gasket with the same size, so that the two silicone gaskets overlap, clamp the mold with a glass sheet, inject the prepared AM solution, place the injection-molded mold under ultraviolet light for 20 min for polymerization, demold after curing to obtain the hydrogel, rinse it repeatedly with deionized water to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment for later use.

[0034] Beneficial effects of Example 1: In this example, by combining the piezoresistive layer (PNA / PVA / MXene) with the piezoelectric layer (P(VDF-TrFE) / BTO thin film), an intelligent hydrogel sensor with dual response to pressure signals is constructed, which has the dual-signal output ability of both piezoresistive resistance change and piezoelectric charge output. Its advantages are as follows: High-sensitivity piezoresistive detection (static pressure sensing) is achieved through the conductive network of MXene, combined with the dynamic stress response of the BTO-doped piezoelectric thin film (high-frequency vibration sensing), covering a wide detection range from 0.1 Pa to 50 kPa; In addition, the low-temperature ultraviolet curing and gradient polarization processes respectively ensure the integrity of the MXene conductive network (inhibiting oxidation) and the high-performance orientation of the piezoelectric thin film (charge output increased by 40%), and the double-layer gel interface enhances the stability through chemical bonding (peel strength > 5 N / m), which is suitable for scenarios such as medical monitoring and robot tactile systems that require synchronous acquisition of multi-modal signals.

[0035] Example Two

[0036] A preparation method of a piezoresistive sensor based on a light-driven hydrogel, characterized by comprising the following steps:

[0037] Step 1: Preparation of the piezoresistive sensor PNA / PVA / MXene of the light-driven hydrogel. Add 10 g of polyvinyl alcohol (PVA) to 90 mL of deionized water, heat and stir in a water bath at 95 °C for 3 h until completely dissolved to obtain a clear and transparent 10% PVA solution for use.

[0038] Step 2: Prepare the hydrogel precursor solution: Add 5 mg of N,N'-methylenebisacrylamide (BIS), 1 g of N-isopropylacrylamide (NIPAM), 100 mg of acrylamide (AM), 1 mL of 10% PVA solution, and 25 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173) to 2.2 ml of deionized water and stir evenly to obtain a clear and transparent solution. Then add 500 μL of 5 mg / mL MXene aqueous dispersion and stir evenly to obtain the hydrogel precursor solution. Stir the whole process in the dark.

[0039] Step 3: Mold injection: The mold is composed of two glass slides (60 mm × 25 mm) sandwiching a silicone gasket with a hollowed-out area in the middle of 40 mm × 10 mm × 1.5 mm. Inject the hydrogel precursor solution into the above mold, and avoid generating bubbles during the injection process.

[0040] Step 4: Crosslinking: Place the molded mold in an 18 °C water bath 15 cm below a UV lamp (λ = 365 nm, 250 W) and irradiate for 20 min. Demold after curing to obtain the hydrogel, rinse it repeatedly with deionized water to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment.

[0041] Beneficial effects of Example Two: This example focuses on optimizing the piezoresistive performance of the MXene composite hydrogel, and adopts a simplified process of ultraviolet rapid curing, which significantly reduces the preparation cost and complexity. The nano-network structure of MXene as a conductive filler endows the hydrogel with a piezoresistive sensitivity coefficient (GF value) of 0.9, showing excellent linear response in the strain range of 0% - 100%; at the same time, the hydrophilic characteristics of the PVA matrix and MXene ensure the long-term moisturizing ability of the hydrogel at room temperature. The preparation process of this sensor does not require complex equipment, is suitable for large-scale production, and can be widely applied to flexible sensing fields with high sensitivity and low-cost requirements such as wearable electronic skin and micro-mechanical contact detection.

[0042] Example Three:

[0043] A preparation method of a hydrogel-based piezoelectric sensor, comprising the following steps:

[0044] Step 1: Dissolve 1 g of P(VDF-TrFE) powder and 0.1 g of barium titanate (BaTiO3) in 8.9 g of N,N-dimethylformamide (DMF), and then place the mixed solution in a water bath at 60 °C and heat and stir for 5 h until completely dissolved to obtain a white homogeneous solution.

[0045] Step 2: Drop the solution into a polytetrafluoroethylene mold with a size of 50 mm * 50 mm * 1 mm, scrape it flat, and then place it in an oven at 60 °C and dry for 1 h. After demolding, perform an annealing treatment at 120 °C in a muffle furnace for 2 h to improve the crystallinity.

[0046] Step 3: Place the annealed piezoelectric film in a silicone oil bath, polarize it at a voltage of 0.5 kV for 30 min, then raise the voltage to 0.8 kV and polarize for 1 h, and finally raise the voltage to 1 kV and polarize for 30 min. Then take out the piezoelectric film and rinse the residual silicone oil on the surface with ethanol.

[0047] Beneficial effects of Example 3: This example is based on a BTO nanoparticle-reinforced P(VDF-TrFE) piezoelectric film, and uses a multi-stage polarization process to improve the dynamic stress detection performance. Through BTO doping and annealing treatment at 120 °C, the piezoelectric coefficient (d33) of the film is improved, and the high-temperature stability is significantly better than that of traditional PVDF (temperature tolerance range -20 to 120 °C); the gradient polarization strategy (0.5 → 1 kV) optimizes the domain arrangement, improves the signal-to-noise ratio (SNR) of charge output, and shows a fast response to high-frequency transient mechanical vibrations or impacts. This sensor has significant advantages in high-frequency dynamic signal detection scenarios such as industrial equipment vibration monitoring and triboelectric energy harvesting.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Preparation method of a dual-mode sensor of a light-driven hydrogel Comprising, characterized in that, comprising the following steps: S1. Preparation of the driving piezoresistive layer PNA / PVA / MXene composite hydrogel: Add 10 g of polyvinyl alcohol (PVA) to 90 mL of deionized water, heat and stir in a water bath at 95 °C for 3 h until completely dissolved to obtain a clear and transparent 10% PVA solution for use; (1) Prepare the hydrogel precursor solution: Add 5 mg of N,N'-methylenebisacrylamide (BIS), 1 g of N-isopropylacrylamide (NIPAM), 100 mg of acrylamide (AM), 1 mL of 10% PVA solution, and 25 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173) to 2.2 ml of deionized water and stir evenly to obtain a clear and transparent solution. Then add 500 μL of 5 mg / mL MXene aqueous dispersion and stir evenly to obtain the hydrogel precursor solution. Stir the whole process in the dark; (2) Mold injection: The mold is composed of two glass slides (60 mm × 25 mm) sandwiching a silicone gasket with a hollowed-out area of 40 mm × 10 mm × 1.5 mm. Inject the hydrogel precursor solution into the above mold, and avoid generating bubbles during the injection process; (3) Crosslinking: Place the molded mold in an 18 °C water bath 15 cm below a UV lamp (λ = 365 nm, 250 W) and irradiate for 20 min. After curing, demold to obtain the hydrogel, rinse the surface of the hydrogel with deionized water repeatedly to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment for use; S2. Preparation of the piezoelectric layer P(VDF-TrFE) / BTO piezoelectric thin film: Dissolve 1 g of P(VDF-TrFE) powder and 0.1 g of barium titanate (BaTiO3) in 8.9 g of N,N-dimethylformamide (DMF). Then place the mixed solution in a water bath at 60 °C and heat and stir for 5 h until completely dissolved to obtain a white and uniform solution. Drop the solution into a polytetrafluoroethylene mold with a size of 50 mm * 50 mm * 1 mm, scrape it flat, and then place it in an oven at 60 °C to dry for 1 h. After demolding, perform an annealing treatment in a muffle furnace at 120 °C for 2 h to improve the crystallinity. Place the annealed piezoelectric thin film in a silicone oil bath, polarize it at a voltage of 0.5 KV for 30 min, then raise the voltage to 0.8 KV and polarize for 1 h, and finally raise the voltage to 1 KV and polarize for 30 min. Then take out the piezoelectric thin film and rinse the surface residual silicone oil with ethanol; S3. Preparation of the drive-sensing integrated intelligent hydrogel: (1) Prepare the acrylamide prepolymer solution: Add 20 mg of N,N'-methylenebisacrylamide (BIS), 100 μL of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and 5 g of acrylamide (AM) to 20 ml of deionized water and stir evenly to obtain a clear and transparent solution; (2) Mold injection: Place the PNIPAM / AM / MXene composite hydrogel obtained above on a glass slide as the bottom layer, place the P(VDF-TrFE) piezoelectric film on top, use a silicone gasket with dimensions of 40 mm × 10 mm × 1 mm and place it above the original silicone gasket with the same dimensions, so that the two silicone gaskets overlap, clamp the mold with a glass slide, and inject the prepared AM solution. (3) Crosslinking: Place the molded mold under ultraviolet light for 20 min for polymerization. After curing, demold to obtain the hydrogel, rinse it repeatedly with deionized water to remove the residual solution on the surface of the hydrogel, and then store it in a humid environment for later use.

2. The preparation method of a dual-mode sensor of a light-driven hydrogel according to claim 1, wherein, The hollowed area in the middle of the silicone gasket selected in Step 1 is 40 mm × 10 mm × 1.5 mm, and the area of the glass slide is 60 mm × 25 mm.

3. The preparation method of a dual-mode sensor of a light-driven hydrogel according to claim 1, characterized in that, The parameters of the silicone oil bath in Step 2 are set as follows: polarize for 30 min at a voltage of 0.5 KV, then increase the voltage to 0.8 KV and polarize for 1 h, and finally increase the voltage to 1 KV and polarize for 30 min.

4. The preparation method of a dual-mode sensor of a light-driven hydrogel according to claim 1, wherein, The size of the silicone gasket in Step 3 is 40 mm × 10 mm × 1 mm, and the parameter of the illumination time under ultraviolet light is 20 min.

5. Use of a dual-mode sensor based on a light-driven hydrogel according to any one of claims 1-4 in detection during a bionic hunting process, characterized in that: The dual-mode sensor based on the light-driven hydrogel is mainly used for detection in the process of bionic hunting. By applying the dual-mode sensor of the light-driven hydrogel in bionic hunting, the advantages of the two sensors are effectively combined, and the disadvantages of the two sensors are complemented. The piezoresistive sensor has higher accuracy when measuring large pressures, but it will cause problems such as non-linearity under small pressures; the piezoelectric sensor performs better in measuring dynamic small pressures, etc. The combination of the two is responsible for achieving high-precision measurement in a wider pressure range during the detection of bionic hunting; when combined, the accuracy and reliability of the measurement are improved. The piezoresistive sensor has a faster response speed, but there are deficiencies in the response to some ultra-high-frequency dynamic signals; the piezoelectric sensor has a faster response speed, especially when measuring rapidly changing physical quantities such as high-frequency vibrations, and it performs excellently in the detection of bionic hunting. The combination of the two is responsible for improving the ability to capture rapidly changing signals.

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