A resistive strain sensor based on organic microgel particles and its preparation method

Abstract

The present invention application discloses a resistive strain sensor based on organic microgel particles and a preparation method thereof. The resistive strain sensor based on organic microgel particles is provided with a microgel particle layer on one side of a first Ecoflex film provided with an electrode layer. When the sensor is stretched, the size of the microgel particle layer changes, wherein the microgel particle layer is in a loose state, so that cracks can be generated under a small strain between the microgel particles and the size of the cracks changes with the strain, thereby changing the migration path of electrons in the microgel particle layer, which is converted into parameter changes of an equivalent resistance model of the sensor, thereby realizing high-sensitivity monitoring of various strains; by providing a second Ecoflex film on the side of the microgel particle layer away from the first Ecoflex film, the sensor has strong stretchability and moisture retention, thereby solving the water loss problem of traditional hydrogel-based sensors and improving the performance stability of the sensor.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, in particular to a resistive strain sensor based on organic microgel particles and a preparation method thereof. Background Art

[0002] In recent years, wearable electronic devices have become a research hotspot. In wearable electronic device systems, sensors have the functions of information collection and exchange. Since wearable electronic devices have high requirements for stability, flexibility and comfort, the research on high-performance flexible and stretchable electronic sensors has attracted more and more attention. Flexible electronic sensors can be divided into strain sensors, temperature sensors and gas sensors according to their properties. Flexible strain sensors are one of the most commonly used sensors.

[0003] Hydrogels have high tensile properties and good biocompatibility, and are very promising substrate materials in the development of flexible strain sensors. However, hydrogel-based strain sensors generally have low sensitivity, especially under small strains. For wearable electronic devices, many functions require high-sensitivity sensors to capture small changes in human-related information, analyze them, and give results and guidance. At present, the sensitivity of hydrogel-based sensors under small strains is mainly improved by changing the morphology and structure of hydrogels, such as making hydrogels into membranes or fibers, making hydrogels porous, and artificially creating cracks on hydrogels. However, while these methods improve the sensitivity of hydrogel-based sensors, the water loss problem of hydrogel-based sensors becomes serious due to the reduction in hydrogel volume and the increase in contact area, which in turn affects the performance stability of hydrogel-based sensors and greatly reduces the service life of hydrogel-based sensors. Summary of the invention

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a resistive strain sensor based on organic microgel particles and a preparation method thereof.

[0005] The technical solution adopted in one aspect of the embodiment of the present invention is:

[0006] A resistive strain sensor based on organic microgel particles, comprising:

[0007] The first Ecoflex membrane;

[0008] An electrode layer, disposed on one side of the first Ecoflex membrane;

[0009] A microgel particle layer is provided on a side of the first Ecoflex film where the electrode layer is provided, and the microgel particle layer wraps the electrode layer;

[0010] The second Ecoflex film is arranged on a side of the microgel particle layer away from the first Ecoflex film, and the second Ecoflex film wraps the microgel particle layer.

[0011] As an optional implementation, the microgel particles in the microgel particle layer are prepared by polymerizing water-soluble monomers or by copolymerizing multiple water-soluble monomers.

[0012] As an optional implementation, the water-soluble monomer includes acrylamide, acrylic acid and N-isopropylacrylamide.

[0013] As an optional embodiment, the microgel particles in the microgel particle layer are evenly spread on the side of the first Ecoflex membrane where the electrode layer is provided, and the spreading area of ​​the microgel particles is smaller than the area of ​​the side of the first Ecoflex membrane where the electrode layer is provided.

[0014] As an optional implementation, the edge area of ​​the first Ecoflex film and the edge area of ​​the second Ecoflex film are laminated.

[0015] As an optional implementation, the electrode layer includes copper foil and silver wire.

[0016] Another aspect of the technical solution adopted by the embodiment of the present invention is:

[0017] A method for preparing a resistive strain sensor based on organic microgel particles comprises the following steps:

[0018] Microgel particles were prepared by inverse emulsion polymerization;

[0019] preparing a first Ecoflex film and a second Ecoflex film by spin coating;

[0020] preparing an electrode layer on one side of the first Ecoflex membrane;

[0021] Laying the microgel particles on the side of the first Ecoflex film where the electrode layer is provided to form a microgel particle layer, wherein the microgel particle layer wraps the electrode layer;

[0022] The second Ecoflex film is disposed on a side of the microgel particle layer away from the first Ecoflex film, and the second Ecoflex film wraps the microgel particle layer.

[0023] As an optional embodiment, the preparation of microgel particles by inverse emulsion polymerization comprises:

[0024] The microgel particles are prepared by polymerizing water-soluble monomers through inverse emulsion polymerization, or by copolymerizing multiple water-soluble monomers through inverse emulsion polymerization;

[0025] treating the microgel particles with a mixed solution containing salt and a humectant;

[0026] The water-soluble monomers include acrylamide, acrylic acid and N-isopropylacrylamide.

[0027] As an optional embodiment, the first Ecoflex film and the second Ecoflex film are prepared by spin coating, comprising:

[0028] Set the spin coating speed and spin coating time;

[0029] According to the spin coating speed and the spin coating time, using Ecoflex to form an Ecoflex film on the aluminum sheet;

[0030] The Ecoflex film is peeled off from the aluminum sheet, and the Ecoflex film is subjected to a hydrophilic treatment by a plasma process to obtain the first Ecoflex film and the second Ecoflex film.

[0031] As an optional embodiment, the step of preparing an electrode layer on one side of the first Ecoflex membrane comprises:

[0032] The electrode layer is prepared by winding a silver wire on a copper foil;

[0033] The electrode layer is adhered to one side of the first Ecoflex film.

[0034] The resistive strain sensor based on organic microgel particles and the preparation method thereof of the embodiment of the present invention are characterized in that a microgel particle layer is arranged on one side of a first Ecoflex film on which an electrode layer is arranged. When the sensor is stretched, the size of the microgel particle layer changes, wherein the microgel particle layer is in a loose state and is not cross-linked, so that cracks can be generated between the microgel particles under a small strain and the size of the cracks changes with the strain, thereby causing the migration path of electrons in the electrode layer through the microgel particle layer to change, which is converted into a parameter change of the equivalent resistance model of the sensor, thereby achieving high-sensitivity monitoring of various strains; by arranging a second Ecoflex film on the side of the microgel particle layer away from the first Ecoflex film, the sensor has strong stretchability and moisture retention, thereby solving the water loss problem of traditional hydrogel-based sensors and improving the performance stability of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a resistive strain sensor based on organic microgel particles according to an embodiment of the present invention;

[0036] Figure 2 This is a flow chart of a method for preparing a resistive strain sensor based on organic microgel particles according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the preparation process of a resistive strain sensor based on organic microgel particles according to an embodiment of the present invention;

[0038] Figure 4 This is a test diagram of the antifreeze performance of the resistive strain sensor based on organic microgel particles according to an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the crack generation and change mechanism and effect of the microgel particle layer of the resistive strain sensor based on organic microgel particles in an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of resistance change of a resistive strain sensor based on organic microgel particles in a strain range of 0-90% according to an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the resistance change of the resistive strain sensor based on organic microgel particles under small strain in an embodiment of the present invention;

[0042] Figure 8 This is a test diagram of the tensile sensitivity of the resistive strain sensor based on organic microgel particles according to an embodiment of the present invention;

[0043] Fig. 9 This is a stability test diagram of a resistive strain sensor based on organic microgel particles according to an embodiment of the present invention;

[0044] Fig.10 This is a resistance response diagram of underwater bending of a resistive strain sensor based on organic microgel particles according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0046] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In recent years, wearable electronic devices have become a research hotspot. In wearable electronic device systems, sensors have the functions of information collection and exchange. Since wearable electronic devices have high requirements for stability, flexibility and comfort, the research on high-performance flexible and stretchable electronic sensors has attracted more and more attention. Flexible electronic sensors can be divided into strain sensors, temperature sensors and gas sensors according to their properties. Flexible strain sensors are one of the most commonly used sensors.

[0049] Hydrogels have high tensile properties and good biocompatibility, and are very promising substrate materials in the development of flexible strain sensors. However, hydrogel-based strain sensors generally have low sensitivity, especially under small strains. For wearable electronic devices, many functions require high-sensitivity sensors to capture small changes in human-related information, analyze them, and give results and guidance. At present, the sensitivity of hydrogel-based sensors under small strains is mainly improved by changing the morphology and structure of hydrogels, such as making hydrogels into membranes or fibers, making hydrogels porous, and artificially creating cracks on hydrogels. However, while these methods improve the sensitivity of hydrogel-based sensors, the water loss problem of hydrogel-based sensors becomes serious due to the reduction of hydrogel volume and the increase of contact area, which in turn affects the performance stability of hydrogel-based sensors and greatly reduces the service life of hydrogel-based sensors. In addition, hydrogels themselves are not conductive and cannot be used directly to prepare sensors.

[0050] To this end, an embodiment of the present invention proposes a resistive strain sensor based on organic microgel particles and a preparation method thereof, wherein a microgel particle layer is arranged on one side of a first Ecoflex membrane on which an electrode layer is arranged, and the size of the microgel particle layer changes when the sensor is stretched, wherein the microgel particle layer is in a loose state and is not cross-linked, so that cracks can be generated between the microgel particles under a small strain and the size of the cracks changes with the strain, thereby causing the migration path of electrons in the electrode layer through the microgel particle layer to change, which is converted into a parameter change of the equivalent resistance model of the sensor, thereby achieving high-sensitivity monitoring of various strains; by arranging a second Ecoflex membrane on the side of the microgel particle layer away from the first Ecoflex membrane, the sensor has strong stretchability and moisture retention, thereby solving the water loss problem of traditional hydrogel-based sensors and improving the performance stability of the sensor.

[0051] like Figure 1 As shown, an embodiment of the present invention proposes a resistive strain sensor based on organic microgel particles, and the resistive strain sensor based on organic microgel particles includes:

[0052] A first Ecoflex membrane 101;

[0053] The electrode layer 102 is disposed on one side of the first Ecoflex film 101;

[0054] The microgel particle layer 103 is disposed on one side of the first Ecoflex film 101 where the electrode layer 102 is disposed, and the microgel particle layer 103 wraps the electrode layer 102;

[0055] The second Ecoflex film 104 is disposed on a side of the microgel particle layer 103 away from the first Ecoflex film 101 , and the second Ecoflex film 104 wraps the microgel particle layer 103 .

[0056] As an optional implementation, the microgel particles in the microgel particle layer 103 are prepared by polymerizing a water-soluble monomer or by copolymerizing a plurality of water-soluble monomers.

[0057] As an optional embodiment, the water-soluble monomer includes acrylamide, acrylic acid and N-isopropylacrylamide.

[0058] Optionally, in the embodiment of the present invention, acrylamide is used as a water-soluble monomer for preparing microgel particles.

[0059] As an optional embodiment, the microgel particles in the microgel particle layer 103 are evenly spread on the side of the first Ecoflex membrane 101 where the electrode layer 102 is provided, so that the microgel particles are in full contact with the electrode layer 102, and the laying area of ​​the microgel particles is smaller than the area of ​​the side of the first Ecoflex membrane 101 where the electrode layer 102 is provided, so that the edge area of ​​the first Ecoflex membrane 101 is not covered by the microgel particle layer 103, making it easier for the second Ecoflex membrane 104 to completely wrap the microgel particle layer 103.

[0060] As an optional implementation, the edge area of ​​the first Ecoflex film 101 and the edge area of ​​the second Ecoflex film 104 are attached to each other.

[0061] Optionally, in the embodiment of the present invention, the edge region of the first Ecoflex film 101 and the edge region of the second Ecoflex film 104 are bonded together using Ecoflex precursor liquid.

[0062] As an optional implementation, the electrode layer 102 includes copper foil and silver wire.

[0063] Among them, the copper foil has a larger pasting area, so that the electrode layer 102 has a better pasting effect on the first Ecoflex film 101 and is not easy to fall off; optionally, one end of the silver wire is wrapped around the copper foil, and the other end is led to the outside of the resistive strain sensor based on organic microgel particles, so as to facilitate the connection of the resistive strain sensor based on organic microgel particles to the test circuit.

[0064] Optionally, the electrode layer 102 includes two electrodes consisting of copper foil and silver wire.

[0065] Optionally, the embodiment of the present invention may also use other materials to prepare the electrode layer 102 .

[0066] based on Figure 1 The resistive strain sensor based on organic microgel particles, the embodiment of the present invention provides a method for preparing a resistive strain sensor based on organic microgel particles, such as Figure 2 and Figure 3 As shown, the preparation method includes the following steps S101-S104:

[0067] S101, preparing microgel particles by inverse emulsion polymerization;

[0068] In the embodiments of the present invention, the microgel particles are prepared by polymerizing water-soluble monomers through inverse emulsion polymerization, or the microgel particles are prepared by copolymerizing multiple water-soluble monomers through inverse emulsion polymerization.

[0069] In the embodiments of the present invention, the sensitivity and strain range of the resistive strain sensor based on organic microgel particles can be adjusted by adjusting the thickness and width of the microgel particle layer.

[0070] In an embodiment of the present invention, a mixed solution containing salt and a humectant is used to treat the microgel particles. Optionally, the salt is potassium chloride and the humectant is glycerol (glycerol). In an embodiment of the present invention, the generation and size of cracks between the microgel particles are controlled by changing the salt / water and glycerol content in the microgel particles.

[0071] S102, preparing a first Ecoflex film and a second Ecoflex film by spin coating;

[0072] Among them, in the embodiment of the present invention, the first Ecoflex film and the second Ecoflex film have high elasticity, good water-proofing and insulation properties, which improve the stretchability and stability of the sensor.

[0073] Specifically, preparing the first Ecoflex film and the second Ecoflex film comprises the following steps:

[0074] 1) Set the spin coating speed and spin coating time;

[0075] 2) using Ecoflex to form an Ecoflex film on the aluminum sheet according to the spin coating speed and the spin coating time;

[0076] 3) peeling the Ecoflex film from the aluminum sheet, and performing a hydrophilic treatment on the Ecoflex film by a plasma process to obtain the first Ecoflex film and the second Ecoflex film.

[0077] Optionally, the spin coating speed is set to 400 rpm and the spin coating time is set to 20 s.

[0078] S103, preparing an electrode layer on one side of the first Ecoflex membrane;

[0079] Specifically, the steps include:

[0080] 1) The electrode layer is made by winding silver wire on copper foil;

[0081] 2) Paste the electrode layer on one side of the first Ecoflex film.

[0082] S104, laying the microgel particles on a side of the first Ecoflex film where the electrode layer is provided to form a microgel particle layer, wherein the microgel particle layer wraps the electrode layer;

[0083] Among them, the microgel particles in the microgel particle layer are evenly spread on the side of the first Ecoflex membrane where the electrode layer is provided, so that the microgel particles are in full contact with the electrode layer, and the laying area of ​​the microgel particles is smaller than the area of ​​the side of the first Ecoflex membrane where the electrode layer is provided, so that the edge area of ​​the first Ecoflex membrane is not covered by the microgel particle layer, which facilitates the second Ecoflex membrane to completely wrap the microgel particle layer.

[0084] S105 , disposing the second Ecoflex film on a side of the microgel particle layer away from the first Ecoflex film, so that the second Ecoflex film wraps the microgel particle layer.

[0085] Specifically, the edge region of the first Ecoflex film and the edge region of the second Ecoflex film are attached to each other, thereby completely enveloping the microgel particle layer, thereby producing a resistive strain sensor based on organic microgel particles.

[0086] Optionally, in the embodiment of the present invention, an Ecoflex precursor liquid is used to bond the edge area of ​​the first Ecoflex film and the edge area of ​​the second Ecoflex film.

[0087] Figure 4 The results of the differential scanning calorimetry test of the resistive strain sensor based on organic microgel particles according to the embodiment of the present invention are shown. The resistive strain sensor based on organic microgel particles according to the embodiment of the present invention was immersed in 0.1M KCl solution and in a mixture of 0.1M KCl and 50% propylene glycol / water, and the peak value was the freezing point of the microgel particles of the material. Figure 4 It can be seen that the freezing point of the microgel particles in the embodiment of the present invention is lower than -120°C after the introduction of glycerol, which effectively improves the antifreeze property of the resistive strain sensor based on the organic microgel particles.

[0088] Figure 5 The schematic diagram shows the mechanism and effect of the organic microgel particle resistive strain sensor according to the embodiment of the present invention, in which cracks appear in the microgel particle layer as the strain degree increases, and the cracks increase with the increase of strain. Figure 5 It can be seen that the resistive strain sensor based on organic microgel particles in the embodiment of the present invention produces cracks in the microgel particle layer under small strain (such as 10% strain), and the cracks increase with the increase of strain, so that the conductive cross-section in the microgel particle layer decreases and the conductivity decreases.

[0089] Figure 6 The figure shows the variation of the resistance of the resistive strain sensor based on organic microgel particles according to the embodiment of the present invention within the strain range of 0-90%. Figure 6It can be seen that the resistive strain sensor based on organic microgel particles in the embodiment of the present invention has a larger strain response range.

[0090] Figure 7 The figure shows the variation of the resistance of the resistive strain sensor based on organic microgel particles according to the embodiment of the present invention within the strain range of 0-1%. Figure 7 It can be seen that the resistive strain sensor based on organic microgel particles in the embodiment of the present invention can produce resistance changes under small strains, and can capture subtle activity signals in practical applications.

[0091] Figure 8 The tensile sensitivity (Gauge Factor, GF) of the resistive strain sensor based on organic microgel particles in the embodiment of the present invention in the strain range of 0-90% is shown. Figure 8 It can be seen that the resistive strain sensor based on organic microgel particles in the embodiment of the present invention has high sensitivity. Compared with the common hydrogel-based strain sensor with a GF value of only a few tenths to tens, the GF of the resistive strain sensor based on organic microgel particles in the embodiment of the present invention is as high as 1275 (when the strain range is 40%-90%). In addition, within the 0-90% strain range, it can be divided into three stages, each stage corresponding to three different processes of crack generation and change of the microgel particle layer during stretching (which can be clearly observed through an optical microscope).

[0092] Fig. 9 The figure shows the change in relative resistance of the resistive strain sensor based on organic microgel particles according to an embodiment of the present invention when it is cyclically stretched 150 times at a strain level of 10%. Fig. 9 It can be seen that the resistive strain sensor based on organic microgel particles according to the embodiment of the present invention has high stability.

[0093] Fig.10 The figure shows the resistance response of the resistive strain sensor based on organic microgel particles according to an embodiment of the present invention when it is bent underwater. Fig.10 It can be seen that the resistive strain sensor based on organic microgel particles in the embodiment of the present invention has good waterproofness and can meet the needs of underwater motion monitoring in practical applications.

[0094] Combination Figure 1-10As can be seen from steps S101-S105, in an embodiment of the present invention, a microgel particle layer is provided on one side of the first Ecoflex membrane on which an electrode layer is provided, and the size of the microgel particle layer changes when the sensor is stretched, wherein the microgel particle layer is in a loose state and is not cross-linked, so that cracks can be generated between the microgel particles under a small strain and the size of the cracks changes with the strain, thereby causing the migration path of electrons in the electrode layer through the microgel particle layer to change, which is converted into a parameter change of the equivalent resistance model of the sensor, thereby achieving high-sensitivity monitoring of various strains; by providing a second Ecoflex membrane on the side of the microgel particle layer away from the first Ecoflex membrane, the sensor has strong stretchability and moisture retention, thereby solving the water loss problem of traditional hydrogel-based sensors and improving the performance stability of the sensor.

[0095] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A resistive strain sensor based on organic microgel particles, characterized in that: include: The first Ecoflex membrane; An electrode layer, disposed on one side of the first Ecoflex membrane; A microgel particle layer is provided on a side of the first Ecoflex film where the electrode layer is provided, and the microgel particle layer wraps the electrode layer; a second Ecoflex film, disposed on a side of the microgel particle layer away from the first Ecoflex film, the second Ecoflex film wrapping the microgel particle layer; The microgel particles in the microgel particle layer are prepared by polymerizing water-soluble monomers; Among them, the size of the microgel particle layer of the sensor changes when it is stretched, and the microgel particle layer is in a loose state and not cross-linked, so that cracks can be generated between the microgel particles under a small strain and the size of the cracks changes with the strain, thereby changing the migration path of electrons in the electrode layer through the microgel particle layer, which is converted into a parameter change of the equivalent resistance model of the sensor.

2. The resistive strain sensor based on organic microgel particles according to claim 1, characterized in that: The water-soluble monomers include acrylamide, acrylic acid and N-isopropylacrylamide.

3. The resistive strain sensor based on organic microgel particles according to claim 1, characterized in that: The microgel particles in the microgel particle layer are evenly spread on the side of the first Ecoflex film where the electrode layer is provided, and the spreading area of ​​the microgel particles is smaller than the area of ​​the side of the first Ecoflex film where the electrode layer is provided.

4. The resistive strain sensor based on organic microgel particles according to claim 3, characterized in that: The edge area of ​​the first Ecoflex film and the edge area of ​​the second Ecoflex film are attached.

5. The resistive strain sensor based on organic microgel particles according to claim 4, characterized in that: The electrode layer includes copper foil and silver wire.

6. A method for preparing a resistive strain sensor based on organic microgel particles, characterized in that: The following steps are involved: Microgel particles were prepared by inverse emulsion polymerization; preparing a first Ecoflex film and a second Ecoflex film by spin coating; preparing an electrode layer on one side of the first Ecoflex membrane; Laying the microgel particles on the side of the first Ecoflex film where the electrode layer is provided to form a microgel particle layer, wherein the microgel particle layer wraps the electrode layer; Disposing the second Ecoflex film on a side of the microgel particle layer away from the first Ecoflex film, the second Ecoflex film wrapping the microgel particle layer; The method for preparing microgel particles by inverse emulsion polymerization comprises: The microgel particles are prepared by polymerizing water-soluble monomers through inverse emulsion polymerization; treating the microgel particles with a mixed solution containing salt and a humectant; The water-soluble monomers include acrylamide, acrylic acid and N-isopropylacrylamide; Among them, the size of the microgel particle layer of the sensor changes when it is stretched, and the microgel particle layer is in a loose state and not cross-linked, so that cracks can be generated between the microgel particles under a small strain and the size of the cracks changes with the strain, thereby changing the migration path of electrons in the electrode layer through the microgel particle layer, which is converted into a parameter change of the equivalent resistance model of the sensor.

7. The method for preparing a resistive strain sensor based on organic microgel particles according to claim 6, characterized in that: The method of preparing the first Ecoflex film and the second Ecoflex film by spin coating comprises: Set the spin coating speed and spin coating time; According to the spin coating speed and the spin coating time, using Ecoflex to form an Ecoflex film on the aluminum sheet; The Ecoflex film is peeled off from the aluminum sheet, and the Ecoflex film is subjected to a hydrophilic treatment by a plasma process to obtain the first Ecoflex film and the second Ecoflex film.

8. The method for preparing a resistive strain sensor based on organic microgel particles according to claim 6, characterized in that: The step of preparing an electrode layer on one side of the first Ecoflex film comprises: The electrode layer is prepared by winding a silver wire on a copper foil; The electrode layer is adhered to one side of the first Ecoflex film.

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