Preparation method and application of intelligent skin substrate

Abstract

The invention relates to the technical field of microelectronics, in particular to a preparation method and application of an intelligent skin substrate. The method comprises the following steps: preparing a first biological protein solution and a second biological protein solution; the film strength corresponding to the first biological protein solution is greater than the film strength corresponding to the second biological protein solution; mixing the first biological protein solution with the second biological protein solution; adding protease, and uniformly mixing to obtain a mixed solution; and the mixed solution is placed in a mold for curing forming, and the intelligent skin substrate is obtained. The intelligent skin substrate has both degradability and safety.

Description

Technical Field

[0001] The invention relates to the field of microelectronic technology, and in particular to a preparation method and application of an intelligent skin substrate. Background Art

[0002] The concept of smart skin was first proposed by the U.S. Air Force in the 1980s. It integrates various sensors and processors on the aircraft skin in a way that will not damage the aircraft skin structure or reduce the aerodynamic performance of the aircraft skin, giving the aircraft the ability to perceive its own status and environment, thereby improving the comprehensive flight capability of the aircraft.

[0003] Flexible electronics technology has made great progress in recent years. With its bendable, conformal, lightweight and mass-producible advantages, flexible electronics provides new opportunities for the development of intelligent skins for aircraft. Various sensors and processors are integrated on a flexible substrate and then conformally attached to the surface of the aircraft, giving the aircraft similar perception capabilities to flying creatures, enabling it to achieve "fly-by-feel" to a certain extent. Placing intelligent skins on flapping-wing drones can help further explore the mechanism of flapping-wing flight in academic terms, and can also monitor flight attitude and flight environment in practical applications, helping to control flapping-wing aircraft according to actual conditions.

[0004] In military reconnaissance, more and more electronic equipment is abandoned due to accidents. On the one hand, this will cause electronic pollution, and on the other hand, it will be exploited by the enemy and cause safety problems. Therefore, how to provide a degradable and highly safe flexible intelligent sensing skin base has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above technical problems, the present application discloses, on one hand, a method for preparing a smart skin substrate, which at least comprises the following steps:

[0006] Prepare a first biological protein solution and a second biological protein solution; the film strength corresponding to the first biological protein solution is greater than the film strength corresponding to the second biological protein solution;

[0007] Mixing the first biological protein solution and the second biological protein solution;

[0008] adding protease and mixing evenly to obtain a mixed solution;

[0009] The mixed solution is placed in a mold for curing and forming to obtain a smart skin substrate.

[0010] In some feasible embodiments, the first biological protein solution is a silk fibroin solution;

[0011] The second biological protein solution includes a gelatin solution.

[0012] In some feasible embodiments, the mass fraction of the silk fibroin solution is 4 wt % to 7 wt %;

[0013] The mass fraction of the gelatin solution is 9wt% to 11wt%.

[0014] In some feasible embodiments, the preparation process of the second biological protein solution includes:

[0015] The gelatin particles and deionized water are mixed in a preset mass ratio, and heated while stirring until the gelatin particles are completely dissolved to obtain the second biological protein solution; the preset mass ratio is 1:8 to 1:10.

[0016] In some feasible embodiments, the mass ratio of the first biological protein solution and the second biological protein solution when mixed is 3:1 to 1:1.

[0017] In some feasible embodiments, before adding the protease, the method further comprises:

[0018] Antifreeze is added; the antifreeze includes glycerol; the mass fraction of the antifreeze in the mixed solution is 5wt% to 10wt%.

[0019] In some feasible embodiments, the concentration of the protease in the mixed solution is 0.05 mg / ml to 0.1 mg / ml.

[0020] The present application further discloses a smart skin device in another aspect, which includes a heating coil, a sensing layer and a smart skin substrate prepared based on the above preparation method;

[0021] The sensing layer is provided on the upper surface of the smart skin substrate; the sensing layer comprises a metal wiring layer and a sensitive material for modifying the electrodes of the metal wiring layer; the sensitive material comprises a temperature sensitive material, a humidity sensitive material and / or a gas sensitive material;

[0022] The heating coil is provided in a preset area of ​​the lower surface of the smart skin substrate; the heating coil is used to heat the preset area to activate the protease to destroy the preset area.

[0023] In another aspect, the present application also discloses a method for preparing the above-mentioned smart skin device, which comprises the following steps:

[0024] forming the metal wiring layer on the smart skin substrate;

[0025] The electrodes of the metal wiring layer are modified by using sensitive materials; the sensitive materials include temperature sensitive materials, humidity sensitive materials and / or gas sensitive materials;

[0026] The heating coil is prepared, and after being dipped into a mixed solution of the first biological protein solution and the second biological protein solution, it is attached to a preset area on the lower surface of the smart skin substrate to obtain a smart skin device.

[0027] The present application further discloses a wing in another aspect, on which the above-mentioned intelligent skin device is provided.

[0028] In the embodiment of the present application, a first biological protein solution and a second biological protein solution are first prepared; the film strength corresponding to the first biological protein solution is greater than the film strength corresponding to the second biological protein solution; the first biological protein solution and the second biological protein solution are mixed; protease is added and mixed evenly to obtain a mixed solution; the mixed solution is placed in a mold for curing and molding to obtain a smart skin substrate. In this way, the smart skin substrate is both degradable and safe, and the flexibility and strength of the smart skin substrate can be adjusted by mixing biological protein solutions with different properties, so that it can be better applied to aircraft equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of a process for preparing a smart skin substrate provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of a smart skin substrate provided in an embodiment of the present application;

[0032] Figure 3 An exploded diagram of an intelligent skin device provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a perception layer provided in an embodiment of the present application;

[0034] Figure 5 A resistance-temperature curve of a smart skin device provided in an embodiment of the present application;

[0035] Figure 6A current-relative humidity curve of a smart skin device provided in an embodiment of the present application;

[0036] Figure 7 A voltage-time curve of a smart skin device provided in an embodiment of the present application;

[0037] Figure 8 The voltage value of the smart skin device on the wing at different flapping frequencies provided in an embodiment of the present application.

[0038] The following is a supplementary description of the attached drawings:

[0039] 1- Smart skin substrate; 2- Metal wiring layer; 3- Sensitive material; 4- Heating coil. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely 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 are within the scope of protection of this application.

[0041] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0042] For the purpose of the following detailed description, it should be understood that the present invention may adopt various alternative changes and step sequences, unless expressly specified to the contrary. In addition, except in any operating examples or otherwise indicated, all numerals representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary according to the desired performance to be obtained by the present invention. At least it is not intended to limit the application of the doctrine of equivalents to the scope of the claims, and each numerical parameter should at least be interpreted according to the number of reported significant figures and by applying ordinary rounding techniques.

[0043] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0044] When a numerical range is disclosed herein, the above range is deemed to be continuous and includes the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges included therein. For example, a specified range from "1 to 10" should be deemed to include any and all sub-ranges between a minimum of 1 and a maximum of 10. Exemplary sub-ranges of ranges 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0045] See also Figure 1 , which is a schematic flow chart of a method for preparing a smart skin substrate provided in an embodiment of the present application. The method for preparing a smart skin substrate comprises at least the following steps:

[0046] S101: preparing a first biological protein solution and a second biological protein solution; the film strength corresponding to the first biological protein solution is greater than the film strength corresponding to the second biological protein solution;

[0047] In some feasible embodiments, the first biological protein solution is a silk fibroin solution; the second biological protein solution includes a gelatin solution, and gelatin is derived from animal collagen. In fact, the second biological protein solution can also be other biological protein solutions, as long as the corresponding film strength is less than the film strength corresponding to the silk fibroin solution. In order to facilitate the understanding of this application, the following will be specifically described with the first biological protein solution being a silk fibroin solution and the second biological protein solution being a gelatin solution.

[0048] The silk fibroin solution can be prepared by cutting the silk cocoons, degumming, washing, drying, dissolving, dialysis, centrifugation and other steps. Specifically, the preparation process of the silk fibroin solution includes:

[0049] Weighing dry and clean silk cocoons, placing them in a sodium carbonate solution, and performing a heating treatment to remove sericin from the cocoons, thereby completing degumming and forming silk.

[0050] For example, the silk cocoons can be cut into pieces and placed in a sodium carbonate solution for heating and stirring. The silk cocoons are silk cocoons after the pupae are removed. The sodium carbonate solution can be heated by an electric furnace or a pressure cooker, with a heating temperature of 60 to 100° C., a heating pressure of 0.5 to 1 MPa, and a heating time of 1 second to 1000 hours.

[0051] The silk is placed in deionized water and washed multiple times.

[0052] Exemplarily, the silk is washed by stirring washing or static soaking, wherein the stirring method of the stirring washing is mechanical stirring or magnetic stirring, and the magnetic stirring speed is 1 to 2000 r / min; during a single washing process, the mass ratio of the silk to the ultrapure water is 1:20 to 1:50, the unit is g / L, and the time is 60s to 5h; after each washing, the silk is taken out and squeezed dry, and the washing is repeated 1 to 50 times.

[0053] The washed silk is dried, and the dried silk is stirred and mixed with a lithium salt aqueous solution, and kept warm for a period of time to obtain a silk fibroin lithium salt aqueous solution.

[0054] Exemplarily, the drying treatment method is natural air drying or heated ventilation drying, the temperature of the heated ventilation drying is 50 to 70° C., and the drying time is 1 to 20 hours.

[0055] Exemplarily, the lithium salt aqueous solution is a lithium thiocyanate solution or a lithium bromide solution, and the concentration of the lithium salt aqueous solution is 0.01 to 2 g / ml; the insulation temperature is 30 to 80° C., and the insulation time is 0.5 to 5 h.

[0056] The use of lithium salt aqueous solution can break the hydrogen bond network within silk fibers, thereby dissolving the silk fibroin into a silk fibroin solution to generate new materials.

[0057] The silk fibroin lithium salt aqueous solution is poured into a dialysis bag and dialyzed in ultrapure water.

[0058] Exemplarily, the dialysis method is static dialysis or magnetic stirring dialysis. Optionally, the specification of the dialysis bag is 10-1000000Da, and the dialysis method is static dialysis or magnetic stirring dialysis; the stirring speed of the magnetic stirring dialysis is 1-2000r / min, the time interval for changing water during the dialysis process is 0.1-100h, and the volume of ultrapure water required for each dialysis is 1mL-1000L. After dialysis, the dissolved lithium bromide can be removed to prevent subsequent ion residues from causing harm to people.

[0059] Exemplarily, the stirring speed is 60 to 300 r / min, and the time interval for changing water during dialysis is 1 to 24 h.

[0060] The dialyzed silk fibroin lithium salt aqueous solution is centrifuged, and the supernatant after centrifugation is collected to obtain the silk fibroin solution.

[0061] Exemplarily, the rotation speed of the centrifugal treatment is 10 to 20,000 r / min, the time is 6 s to 2 h, and the temperature is -3 to 5°C.

[0062] In some feasible implementations, the mass fraction of the silk fibroin solution is 4 wt % to 7 wt %. Specifically, the mass fraction of the silk fibroin solution may be 4 wt %, 5 wt %, 6 wt % or 7 wt %.

[0063] In some feasible embodiments, the mass fraction of the gelatin solution is 9wt% to 11wt%, specifically, the mass fraction of the gelatin solution can be 9wt%, 9.5wt%, 10wt%, 10.5wt% or 11wt%. In other embodiments, the second biological protein solution can also be other biological protein solutions, and the Young's modulus of the film formed by the second biological protein solution is less than the Young's modulus of the film formed by the silk fibroin.

[0064] The preparation process of the second biological protein solution may include: mixing biological protein particles and deionized water according to a preset ratio, and heating while stirring until the biological protein particles are completely dissolved, and the heating temperature may be 90° C. to 120° C.

[0065] In the embodiment of the present application, the second biological protein solution can be a gelatin solution, which can be obtained by mixing polyvinyl alcohol particles and deionized water in a mass ratio of 1:8 to 1:10 to obtain a gelatin solution with a mass fraction of 9wt% to 11wt%. Specifically, the mass ratio of gelatin particles and deionized water when mixed can be 1:8, 1:9 or 1:10.

[0066] S103: Mixing the first biological protein solution and the second biological protein solution.

[0067] In some feasible embodiments, the mass ratio of the first protein solution and the second biological protein solution when mixed is 3:1 to 1:1. Specifically, the mass ratio of the first protein solution to the second biological protein solution can be 3:1, 2:1 or 1:1. In an embodiment of the present application, the first biological protein solution can be a silk fibroin solution, and the second biological protein solution can be a gelatin solution. The mass ratio of the silk fibroin solution to the gelatin solution can be 3:1, 2:1 or 1:1. By adjusting the mass ratio of the silk fibroin solution to the gelatin solution, the Young's modulus and elongation at break of the smart skin substrate can be adjusted. Exemplarily, by increasing the mass of the first biological protein solution in the mixed solution, the Young's modulus of the smart skin substrate can be improved; conversely, by increasing the mass of the second biological protein solution in the mixed solution, the elongation at break of the smart skin substrate can be improved.

[0068] S105: Add protease and mix evenly to obtain a mixed solution.

[0069] In some feasible embodiments, the degradability of the composite protein material is adjusted by adding a protease to the mixed solution. Specifically, a protease can be added in step S105. Since the hydrogel contains silk fibroin and gelatin, the degradation of the composite protein material can be triggered by incorporating a protease and activating the activity of the enzyme at high temperature. Optionally, the protease can be proteinase K, and the concentration of the protease can be 0.05 mg / ml to 0.1 mg / ml. Specifically, the concentration of the protease can be 0.05 mg / ml, 0.06 mg / ml, 0.07 mg / ml, 0.08 mg / ml, 0.09 mg / ml or 0.1 mg / ml. The protease can be activated at a temperature of 50 to 60°C, thereby decomposing the biological protein and achieving self-destruction of a preset area of ​​the substrate.

[0070] In some feasible embodiments, before adding the protease, the method further comprises: adding an antifreeze; the antifreeze comprises glycerol; the mass fraction of the antifreeze in the mixed solution is 5wt% to 10wt%. Exemplarily, the mass fraction of the antifreeze in the mixed solution is 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt%.

[0071] S107: placing the mixed solution in a mold for curing and forming to obtain a smart skin substrate.

[0072] In the embodiment of the present application, the required volume of the mixed solution can be cast on the mold, and when the mixed solution is solidified, a Figure 2 The flexible smart skin substrate shown. Optionally, the curing conditions may be 20°C to 25°C and 35% to 50% relative humidity.

[0073] The embodiment of the present application comprises the following steps: mixing a first bioprotein solution and a second bioprotein solution; the film strength corresponding to the first bioprotein solution is greater than the film strength corresponding to the second bioprotein solution; adding protease and mixing evenly to obtain a mixed solution; placing the mixed solution in a mold for curing and forming to obtain a smart skin base, so that the smart skin base is both degradable and safe, and by mixing bioprotein solutions with different properties, the flexibility and strength of the smart skin base can be adjusted, so that it can be better applied to aircraft equipment.

[0074] In another aspect, the present application also discloses an intelligent skin device, see Figure 3 , which shows an exploded view of an intelligent skin device provided in an embodiment of the present application. The intelligent skin device includes a heating coil 4, a sensing layer and an intelligent skin substrate 1 prepared based on the above-mentioned preparation method; the upper surface of the intelligent skin substrate 1 is provided with the sensing layer; the sensing layer includes a metal wiring layer 2 and a sensitive material 3 for modifying the electrode of the metal wiring layer 2; the sensitive material 3 includes a temperature sensitive material 3, a humidity sensitive material 3 and / or a gas sensitive material 3; the preset area of ​​the lower surface of the intelligent skin substrate 1 is provided with the heating coil 4; the heating coil 4 is used to heat the preset area to activate the protease to destroy the preset area.

[0075] Exemplarily, the metal wiring layer includes electrodes and metal wires connecting the electrodes, and a sensor device capable of detecting and sensing the required performance is formed by coating sensitive materials (such as sensitive ink) on the electrodes. Figure 4 Figure (a) in FIG. 1 shows metal wires in the metal wiring layer for connecting each electrode to an external control unit. Figure 4 Figure (b) shows multiple electrodes in the metal wiring layer. Figure 4 Figure (c) in the figure shows an electrode coated with a sensitive material. For example, temperature-sensitive ink, humidity-sensitive ink or gas-sensitive ink are coated to form corresponding temperature, humidity or gas detection sensor devices, and the corresponding sensitive ink can be selected as needed. Optionally, the sensitive material can be a temperature-sensitive material, a humidity-sensitive material, or a gas-sensitive material. According to needs, the sensitive material can also be two or more of the above-mentioned sensitive materials. The smart skin device can also integrate a strain gauge, which can monitor the motion state of the wing machine itself. The temperature, humidity and gas sensor devices can be used to monitor the temperature, humidity and corresponding gas conditions in the surrounding environment. Applying it to the wing of a bionic flapping-wing drone can realize the perception of its own posture and environmental parameters. Optionally, the strain gauge can also be formed based on biological protein materials, which further simplifies the structure of the device and improves the reliability of the attachment of the device to the wing.

[0076] The above-mentioned heating coil and metal wiring layer can both be connected to an external control unit, so that the control unit can realize the collection of sensing signals and the on-off control of the heating coil.

[0077] The smart skin device provided in the embodiment of the present application is simple to manufacture, wherein the substrate is prepared by simply mixing two biological protein solutions of different properties and adding protease, and the substrate is made based on biological protein, which is a renewable material and has the advantages of energy saving and environmental protection. Various sensing devices can be integrated on the smart skin device and arranged on the wing, which can give flying equipment (such as airplanes, drones, etc.) similar sensing capabilities to flying organisms without causing damage to the structure and aerodynamic performance of the aircraft. The setting of the heating coil can activate the protease by high temperature, thereby achieving self-destruction of the preset area of ​​the smart skin device, improving the safety performance of the device, and enabling it to be applied to the field of military reconnaissance.

[0078] On the other hand, the present application also discloses a method for preparing the above-mentioned smart skin device, which includes the following steps: forming the metal wiring layer on the smart skin substrate; modifying the electrodes of the metal wiring layer with sensitive materials; the sensitive materials include temperature sensitive materials, humidity sensitive materials and / or gas sensitive materials; preparing the heating coil, and immersing the heating coil in a mixed solution of the first biological protein solution and the second biological protein solution, and then attaching it to a preset area on the lower surface of the smart skin substrate to obtain a smart skin device.

[0079] Exemplarily, the metal wiring layer can be prepared using a metal patterning method, which is specifically described as follows: a mask is provided, the mask is provided with a hollow pattern, the mask is covered on the smart skin substrate, and metal is deposited through the mask using electron beam evaporation technology to form a metal layer (including metal wiring and electrodes) in the metal wiring layer. In other embodiments, printed electronics methods (including screen printing, gravure printing, inkjet printing, etc.) can also be used to form wires and electrodes.

[0080] For example, the sensitive ink may be coated on the electrode of the metal wiring layer and then cured under preset conditions. Optionally, the sensitive ink may be heated at 120°C for 30 minutes to be fixed. Depending on the selected material, the temperature and time corresponding to the above preset conditions are also different, and the time required at different temperatures is also different. The above is only an example.

[0081] Exemplarily, the heating coil can be prepared by using micro-nano processing technology, and the adhesion strength between the heating coil and the smart skin substrate can be improved by dipping the heating coil into a mixed solution of the first bioprotein solution and the second bioprotein solution.

[0082] Specifically, the intelligent skin device prepared by the above method is subjected to relevant performance tests, and the following results can be obtained: Figure 5-8 The test results shown are Figure 5 It can be seen that within the range of 25 to 125°C, as the temperature increases, the resistance of the device also increases linearly, and the linear fitting formula is R = 0.010T + 6.163, R 2 =0.994, where R represents resistance and T represents temperature, indicating that the device provided by the present application has a high sensitivity to temperature. Figure 6 It can be seen that when the relative humidity changes, the current of the device will also change accordingly, so that accurate detection of humidity can be achieved. Figure 7 It can be seen that the device has good repeatability for gas detection. Figure 8 , which shows the voltage value of the smart skin device on the wing at different flapping frequencies provided by an embodiment of the present application. It can be seen that when the flapping frequency of the wing is low frequency, the maximum amplitude of the output voltage of the smart skin device is about 1.9V; when the flapping frequency of the wing is medium frequency, the maximum amplitude of the output voltage of the smart skin device is about 2V; when the flapping frequency of the wing is high frequency, the maximum amplitude of the output voltage of the smart skin device is about 2.2V, that is, the flapping frequency of the wing is proportional to the amplitude of the output voltage of the smart skin device.

[0083] The present application further discloses a wing in another aspect, on which the above-mentioned intelligent skin device is provided.

[0084] In summary, the technical solution of the present application provides a composite film formed by two biological proteins of different properties as a substrate, interconnecting wires through electron beam evaporation, modifying the interdigital electrodes with sensitive ink to achieve the sensing function, and activating the protease incorporated in the substrate through a heating coil to achieve a controllable self-destructive intelligent skin device. The intelligent skin device is conformally attached to the wings of a bionic flapping-wing aircraft to achieve state monitoring of the flapping-wing aircraft itself and perception of the surrounding environmental parameters, as well as self-destruction under specific conditions. It provides a new way for flapping-wing UAVs to achieve the "fly-by-feel" flight mode. By carrying various sensors, it can be used in some detection and rescue fields. Its self-destruction function also provides new ideas for military reconnaissance and security electronics.

[0085] When used in some special military reconnaissance missions, the intelligent skin device can receive external commands through radio communications to achieve controllable self-destruction according to the situation.

[0086] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing a smart skin substrate, characterized in that: At least the following steps are included: Prepare a first biological protein solution and a second biological protein solution; the film strength corresponding to the first biological protein solution is greater than the film strength corresponding to the second biological protein solution; Mixing the first biological protein solution and the second biological protein solution; adding protease and mixing evenly to obtain a mixed solution; The mixed solution is placed in a mold for curing and forming to obtain a smart skin substrate.

2. The preparation method according to claim 1, characterized in that: The first biological protein solution is a silk fibroin solution; The second biological protein solution includes a gelatin solution.

3. The preparation method according to claim 2, characterized in that: The mass fraction of the silk fibroin solution is 4wt% to 7wt%; The mass fraction of the gelatin solution is 9wt% to 11wt%.

4. The preparation method according to claim 2, characterized in that: The preparation process of the second biological protein solution includes: The gelatin particles and deionized water are mixed in a preset mass ratio, and heated while stirring until the gelatin particles are completely dissolved to obtain the second biological protein solution; the preset mass ratio is 1:8 to 1:

10.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The mass ratio of the first biological protein solution and the second biological protein solution when mixed is 3:1 to 1:

1.

6. The preparation method according to any one of claims 1 to 4, characterized in that: Prior to adding the protease, the method further comprises: Antifreeze is added; the antifreeze includes glycerol; the mass fraction of the antifreeze in the mixed solution is 5wt% to 10wt%.

7. The preparation method according to any one of claims 1 to 4, characterized in that: The concentration of the protease in the mixed solution is 0.05 mg / ml to 0.1 mg / ml.

8. An intelligent skin device, characterized in that: It comprises a heating coil, a sensing layer and a smart skin substrate prepared by the preparation method according to any one of claims 1 to 7; The sensing layer is provided on the upper surface of the smart skin substrate; the sensing layer comprises a metal wiring layer and a sensitive material for modifying the electrodes of the metal wiring layer; the sensitive material comprises a temperature sensitive material, a humidity sensitive material and / or a gas sensitive material; The heating coil is provided in a preset area of ​​the lower surface of the smart skin substrate; the heating coil is used to heat the preset area to activate the protease to destroy the preset area.

9. A method for preparing the smart skin device according to claim 8, characterized in that: The following steps are involved: forming the metal wiring layer on the smart skin substrate; The electrodes of the metal wiring layer are modified by using sensitive materials; the sensitive materials include temperature sensitive materials, humidity sensitive materials and / or gas sensitive materials; The heating coil is prepared, and after being dipped into a mixed solution of the first biological protein solution and the second biological protein solution, it is attached to a preset area on the lower surface of the smart skin substrate to obtain a smart skin device.

10. A wing, characterized in that: The wing is provided with the intelligent skin device as claimed in claim 8.

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