A flexible olfactory / tactile dual-function sensor and its fabrication method

Abstract

This invention discloses a flexible olfactory / tactile dual-function sensor and its fabrication method. The flexible olfactory / tactile dual-function sensor includes: an upper electrode, a lower electrode, and a pressure-sensitive sensor and a gas-sensitive sensor located between the upper and lower electrodes. The pressure-sensitive sensor includes a flexible cube, and the gas-sensitive sensor includes four flexible side plates. The four flexible side plates are symmetrically fixed in pairs to the four sides of the flexible cube, forming a cubic spatial region that mates with the flexible cube. The upper and lower electrodes are electrically connected to the bottom and top surfaces of the flexible cube and the flexible side plates, respectively. This invention achieves accurate dual-function detection of gas and pressure, solving the problems of existing flexible sensors having single functions, severe signal crosstalk during multi-function integration, and insufficient structural stability in flexible scenarios. It meets the needs of flexible electronic skin, wearable devices, and other applications for lightweight dual-function sensing.

Description

Technical Field

[0001] This invention relates to the field of flexible sensor technology, and in particular to a flexible olfactory / tactile dual-function sensor and its fabrication method. Background Technology

[0002] With continuous breakthroughs in the research of flexible sensors, sensor devices that can only detect a single signal are no longer able to meet the needs of simultaneously sensing multiple stimulus signals in complex situations in the application scenarios of high-performance flexible sensors.

[0003] First, some sensors capable of dual-function signal sensing also suffer from crosstalk between the two signals. Therefore, to meet the demands of simultaneous sensing of multiple signals and improved device integration, lightweight, flexible sensors capable of multimodal signal sensing have become a research hotspot. Currently, there is no design and fabrication method for a dual-function sensor that can achieve both olfactory and tactile sensing while overcoming crosstalk between signals.

[0004] Existing patent CN111998965A discloses "a dual-electrode flexible sensor capable of simultaneously detecting and distinguishing temperature and pressure, its fabrication method and application." Although it is a flexible sensor integrating pressure and temperature, it cannot solve the interference of physical deformation on chemical sensing signals at the circuit and algorithm level. Existing literature "Design and Performance of Flexible Fully Decoupled Temperature-Pressure Dual-Function Sensor" discloses a flexible sensor that achieves "full decoupling" of pressure and temperature signals through a sophisticated physical structure. However, its approach of passively decoupling through purely physical structures also fails to address the severe interference of physical deformation on chemical sensing signals. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, this invention proposes a flexible olfactory / tactile dual-function sensor and its preparation method, which realizes accurate dual-function detection of gas and pressure, solves the problems of single function of existing flexible sensors, serious signal crosstalk when integrating multiple functions, and insufficient structural stability in flexible scenarios, and meets the needs of flexible electronic skin, wearable devices and other applications for lightweight dual-function sensing.

[0006] The present invention proposes a flexible olfactory / tactile dual-function sensor, comprising: an upper electrode, a lower electrode, and a pressure-sensitive sensor and a gas-sensitive sensor located between the upper electrode and the lower electrode;

[0007] The pressure-sensitive sensor includes a flexible cube, and the gas-sensitive sensor includes four flexible side plates; the four flexible side plates are symmetrically fixed in pairs to the four sides of the flexible cube, and together form a cubic space region that mates with the flexible cube.

[0008] The upper and lower electrodes are electrically connected to the top and bottom surfaces of the flexible cube and the flexible side plate, respectively.

[0009] In this invention, by using a specific spatial arrangement of pressure-sensitive and gas-sensitive sensors, combined with the difference in resistance range, the two signals can be independently distinguished without additional decoupling circuitry.

[0010] Preferably, the flexible cube is a porous sponge filled with conductive material;

[0011] Preferably, the conductive material is at least one of carbon nanotubes, graphite, carbon black, or silver nanowires, and the porous sponge is polyurethane sponge or PDMS sponge.

[0012] In this invention, the pressure-sensitive sensor detects pressure by causing a change in resistance due to the compression and deformation of a conductive material under pressure. The pressure-sensitive layer is designed as a tetrahedral structure located in the central region of the sensor, while the gas-sensitive layer is designed as multiple trapezoidal structures arranged around the tetrahedron. This achieves physical isolation between olfactory and tactile signals and ensures the dual functionality of the sensor.

[0013] Preferably, all four flexible side plates are isosceles trapezoidal side plates, and each pair of trapezoidal side plates is adjacent to each other with one hypotenuse of the trapezoidal side plate to form the cubic space region.

[0014] Preferably, the flexible side plate is a porous sponge loaded with quantum dot material;

[0015] Preferably, the quantum dot material is at least one of PbS quantum dots, SnO2 nanowires, WO3 nanowires, polyaniline, polypyrrole, or graphene oxide, and the porous sponge is polyurethane sponge or PDMS sponge.

[0016] In this invention, the gas-sensitive sensor detects gases by adsorbing gases through quantum dot gas-sensitive materials, which causes a change in resistance.

[0017] Preferably, the upper electrode includes a pressure-sensitive signal electrode and four gas-sensitive signal electrodes that are insulated from each other. The pressure-sensitive signal electrode is electrically connected to the flexible cube, and the four gas-sensitive signal electrodes are electrically connected to the four flexible side plates, respectively. The lower electrode includes a full-surface electrode that is electrically connected to both the flexible cube and the flexible side plates.

[0018] Preferably, the upper electrode is a flexible substrate with a patterned conductive metal layer deposited on its surface. The patterned conductive metal layer includes a first region conductive metal layer and four second region conductive metal layers. The four second region conductive metal layers are symmetrically arranged around the first region conductive metal layer and are isolated from each other. The lower electrode is a flexible substrate with a conductive metal layer deposited on its entire surface.

[0019] In this invention, the independent electrode design of the upper electrode can avoid crosstalk between the two signals, enabling precise dual-function perception of smell and touch.

[0020] Preferably, the sensor further includes: an upper flexible encapsulation layer and a lower flexible encapsulation layer;

[0021] The upper flexible encapsulation layer and the lower flexible encapsulation layer are located on the side of the upper electrode and the lower electrode that are far away from the pressure-sensitive sensor and the gas-sensitive sensor, respectively;

[0022] Preferably, the upper flexible encapsulation layer and the lower flexible encapsulation layer are PDMS layers.

[0023] In this invention, the flexible encapsulation structure of the upper and lower flexible encapsulation layers can ensure the structural stability and performance consistency of the sensor under bending, stretching and other deformations, while also providing mechanical protection.

[0024] This invention also proposes a method for fabricating the above-mentioned flexible olfactory / tactile dual-function sensor, comprising the following steps:

[0025] S1. The pressure-sensitive material is made into a flexible cube, and the gas-sensitive material is made into four flexible side plates;

[0026] S2. Fix the four flexible side plates symmetrically to the four sides of the flexible cube in pairs, and enclose a cubic space area that fits and assembles with the flexible cube to obtain the pressure-sensitive sensor and the gas-sensitive sensor.

[0027] S3. After the electrode material is made into upper and lower electrodes, they are attached to the top and bottom surfaces of the flexible cube and flexible side plate in the pressure-sensitive sensor and the gas-sensitive sensor, respectively, to obtain the flexible olfactory / tactile dual-function sensor.

[0028] Preferably, in step S1, the porous sponge is cut and filled with conductive material to form a flexible cube; the porous sponge is cut and loaded with quantum dot material to form four flexible side plates.

[0029] Preferably, it further includes: S4, after the encapsulation material is made into an upper flexible encapsulation layer and a lower flexible encapsulation layer, it is attached to the surface of the upper electrode and the lower electrode away from the pressure-sensitive sensor and the gas-sensitive sensor, respectively.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) In this invention, gas detection is achieved by the resistance change caused by the quantum dots loaded in the trapezoidal porous sponge in the gas-sensitive layer, and pressure detection is achieved by the resistance change caused by the conductive material filled in the tetrahedral porous sponge in the pressure-sensitive layer. At the same time, the spatial layout difference and resistance range difference between the gas-sensitive layer and the pressure-sensitive layer are utilized to effectively avoid crosstalk between olfactory and tactile signals. Through this measure, a dual-function sensor that can simultaneously realize gas (olfactory) and pressure (tactile) sensing is prepared, which can meet the lightweight dual-function sensing requirements of flexible electronic skin, wearable devices and other scenarios.

[0032] (2) In this invention, both gas and pressure signals are characterized by resistance signals. The key to distinguishing the two signals is that the two signals are transmitted through two separate transmission channels, so there will be no problem of the two signals being transmitted through the same transmission line and causing the signals to mix together. Moreover, although the range of resistance change caused by gas and pressure overlaps to a certain extent, the overall resistance change value changes in two different ranges. Therefore, it is relatively easy to distinguish whether it is caused by pressure or gas by the resistance value and the amount of change. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the dual-function sensor described in Embodiment 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of the upper electrode structure in the dual-function sensor described in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the lower electrode structure in the dual-function sensor described in an embodiment of the present invention;

[0036] Figure 4 The image shows the dynamic gas-sensitive response curve of the dual-function sensor described in this embodiment of the invention under a target gas environment.

[0037] Figure 5 This invention describes the gas-sensing response characteristics of a dual-function sensor with different pore densities under different pressure conditions, as described in the embodiments of the present invention.

[0038] Figure 6 The curves showing the displacement of the dual-function sensor described in Embodiment 1 of the present invention as a function of pressure, with or without the gas-sensitive sensing element assembled. Detailed Implementation

[0039] The technical solution of the present invention will be described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0040] Example

[0041] Reference Figure 1 This embodiment proposes a flexible olfactory / tactile dual-function sensor, including: an upper electrode 3, a lower electrode 4, and a pressure-sensitive sensor 1 and a gas-sensitive sensor 2 located between the upper electrode 3 and the lower electrode 4;

[0042] The pressure-sensitive sensor 1 includes a flexible cube 11, and the gas-sensitive sensor 2 includes four flexible side plates 21; the four flexible side plates 21 are symmetrically fixed in pairs to the four sides of the flexible cube 11, and together form a cubic space region that is fitted and assembled with the flexible cube 11.

[0043] The top and bottom surfaces of the flexible cube 11 and the flexible side plate 21 are electrically connected to the upper electrode 3 and the lower electrode 4, respectively.

[0044] In a specific embodiment, the flexible cube 11 is a flexible cuboid block with a length of 10mm, a width of 10mm, and a height of 8mm. Its material is a porous polyurethane sponge filled with carbon nanotubes (CNTs).

[0045] In a specific embodiment, the flexible side plate 21 is an isosceles trapezoidal side plate with an isosceles trapezoidal cross-section. The upper base of the isosceles trapezoid is 10mm, the lower base is 20mm, the thickness is 5mm, and the height is 20mm. The trapezoidal side plates are adjacent to each other with one hypotenuse to form the cubic space region. The material is a porous polyurethane sponge filled with lead sulfide (PbS) quantum dots.

[0046] In a specific embodiment, four flexible side plates 21 are bonded and fixed to the four sides of the flexible cube 11 with insulating adhesive; the insulating adhesive can be epoxy resin, silicone rubber, etc.

[0047] In a specific embodiment, the upper electrode 3 includes a pressure-sensitive signal electrode and four gas-sensitive signal electrodes that are insulated from each other. The pressure-sensitive signal electrode is electrically connected to the flexible cube 11, and the four gas-sensitive signal electrodes are electrically connected to the four flexible side plates 21 respectively. The lower electrode 4 includes a full-surface electrode, which is electrically connected to both the flexible cube 11 and the flexible side plates 21.

[0048] Reference Figure 2 In a specific embodiment, the upper electrode 3 is a polyimide (PI) film with a patterned gold layer (thickness of 200 nm) deposited on its surface. The PI film has a thickness of 125 μm. The patterned gold layer includes a square gold layer (6 mm long and 6 mm wide) and four rectangular gold layers (8 mm long and 4 mm wide) symmetrically distributed around the four sides of the square gold layer. The square gold layer and the rectangular gold layers are isolated from each other, and the square gold layer is a pressure-sensitive signal electrode, while the rectangular gold layers are gas-sensitive signal electrodes.

[0049] Reference Figure 3In a specific embodiment, the lower electrode 4 is a polyimide (PI) film with a gold layer (thickness of 200nm) deposited on its surface. The PI film has a thickness of 125μm, and the gold layer (length of 18mm and width of 18mm) is the entire electrode.

[0050] In a specific embodiment, the sensor further includes an upper flexible encapsulation layer 5 and a lower flexible encapsulation layer 6, which are located on the side surfaces of the upper electrode 3 and the lower electrode 4 away from the pressure-sensitive sensor 1 and the gas-sensitive sensor 2, respectively; both the upper flexible encapsulation layer 5 and the lower flexible encapsulation layer 6 are PDMS thin films with a thickness of 200 μm.

[0051] This embodiment also proposes a method for fabricating a flexible olfactory / tactile dual-function sensor, including the following steps:

[0052] (1) After laser cutting the porous polyurethane sponge (pore size density of 40 PPI or 50 PPI) into a cuboid block with dimensions of 10 mm long × 10 mm wide × 20 mm high, carbon nanotubes (CNT) and polydimethylsiloxane (PDMS) are mixed to form a slurry (CNT mass fraction 3%). The cuboid block is completely immersed in the above slurry for 20 min by impregnation method to allow the carbon nanotubes to fully fill the cuboid block. Then it is taken out and cured at 80°C for 1 h to obtain a flexible cube 11, which is the pressure-sensitive sensing element 1.

[0053] (2) After laser cutting the porous polyurethane sponge (pore density of 40 PPI or 50 PPI) into four isosceles trapezoidal side plates with dimensions of 10 mm at the top, 20 mm at the bottom, 5 mm at the thickness, and 20 mm at the height, bismuth sulfide (Bi2S3) nanocrystals are dispersed in ethanol to form a uniform suspension solution (concentration of 5 mg / mL). The isosceles trapezoidal side plates are completely immersed in the above suspension solution for 20 min by the impregnation method, so that the nanocrystals can fully enter the pores of the sponge and be adsorbed on the surface of the skeleton. Then, they are taken out and dried at 70 °C for 40 min. The impregnation and drying process is repeated three times to obtain four flexible side plates 21, namely gas-sensitive sensing elements 2.

[0054] (3) The flexible cube 11 is used as the pressure-sensitive sensor 1, and the four flexible side plates 21 are used as the gas-sensitive sensor 2. The surfaces of the four flexible side plates 21 are coated with insulating glue and then attached to the four sides of the flexible cube 11 to form a cube space area with the flexible cube 11.

[0055] (4) A patterned gold layer (200 nm thick) and a front gold layer (200 nm thick) are deposited on the surface of a polyimide (PI) film (125 μm thick) by magnetron sputtering to obtain an upper electrode 3 and a lower electrode 4. In the upper electrode 3, the patterned gold layer includes a square gold layer (6 mm long and 6 mm wide) and four rectangular gold layers (8 mm long and 4 mm wide) symmetrically distributed around the four sides of the square gold layer. The square gold layer and the rectangular gold layers are isolated from each other, and the square gold layer is a pressure-sensitive signal electrode and the rectangular gold layer is a gas-sensitive signal electrode. In the lower electrode 4, the whole surface gold layer (18 mm long and 18 mm wide) is a whole surface electrode, and the whole surface electrode is electrically connected to the flexible cube 11 and the flexible side plate 21.

[0056] (5) The upper electrode 3 is aligned with the top surface of the flexible cube 11 and the flexible side plate 21 and pasted thereon to ensure that the pressure-sensitive signal electrode is electrically connected to the flexible cube 11 and the four gas-sensitive signal electrodes are electrically connected to the four flexible side plates 21 respectively; the lower electrode 4 is aligned with the bottom surface of the flexible cube 11 and the flexible side plate 21 and pasted thereon to ensure that its entire electrode is electrically connected to the flexible cube 11 and the flexible side plate 21 at the same time.

[0057] (6) After mixing the polydimethylsiloxane PDMS prepolymer and curing agent at a mass ratio of 10:1, vacuum degassing was performed for 15 min. The PDMS film (thickness of 200 μm) was then prepared on a flat glass plate by casting method, and the upper flexible encapsulation layer 5 and the lower flexible encapsulation layer 6 were obtained respectively.

[0058] (7) The upper flexible encapsulation layer 5 is attached to the surface of the upper electrode 3 away from the pressure-sensitive sensor 1 and the gas-sensitive sensor 2, and the lower flexible encapsulation layer 6 is attached to the surface of the lower electrode 4 away from the pressure-sensitive sensor 1 and the gas-sensitive sensor 2. The resulting whole is hot-pressed and bonded in a hot press at 70°C and 0.2MPa for 45 minutes to obtain the flexible olfactory / tactile dual-function sensor.

[0059] Figure 4 This is the dynamic gas-sensing response curve of the dual-function sensor described in this embodiment of the invention under a target gas environment. (Refer to...) Figure 4 As can be seen, during the test, when a certain concentration of ammonia gas was introduced into the test chamber at t=0s, the sensor resistance value rapidly decreased from an initial value of approximately 4.78MΩ, reaching a minimum value of approximately 4.36MΩ at approximately 12s. This indicates that the gas-sensitive sensor undergoes a rapid adsorption reaction with the target gas molecules, causing a change in the conductive path and resulting in a significant decrease in resistance. Subsequently, when the gas supply was stopped or the gas concentration decreased, the sensor resistance gradually recovered and tended to stabilize, demonstrating good reversible response. In summary, this demonstrates that the described gas-sensitive sensor can effectively sense and output signals to the target gas.

[0060] In this invention, a sponge is used as a flexible substrate, and its internal pores provide a dual channel for pressure deformation and gas diffusion. Gas-sensitive nanomaterials are impregnated on the surface of the sponge through an impregnation coating process to form a gas-sensitive functional layer. The middle sponge substrate serves as a pressure-sensitive matrix, and its pores undergo compression deformation under pressure, triggering changes in electrical signals, thereby achieving dual functions of gas sensing and pressure sensing in the same structure.

[0061] The high specific surface area and interconnected channels of the porous sponge substrate increase the effective contact area between the gas-sensitive material and the target gas molecules, thereby improving the gas adsorption / desorption kinetics. At the same time, its flexible properties enable the sensor to achieve a stable and repeatable resistance response over a wide pressure range (such as 0-40 kPa) with low structural fatigue.

[0062] Simultaneous testing of ammonia and pressure showed that the sensor could still produce significant and distinguishable electrical responses (ΔR / R0 changes by 1.5%-4.5%) to ammonia concentrations of 10-100 ppm under different static pressure backgrounds, proving that pressure sensing and gas sensing functions can coexist and work together effectively, rather than simply being superimposed.

[0063] Figure 5 This describes the gas-sensing response characteristics of the dual-function sensor with different pore densities under different pressure conditions, as described in the embodiments of the present invention. (Refer to...) Figure 5 It can be seen that the sensors corresponding to porous sponges with pore densities of 40 PPI and 50 PPI have gas-sensitive response characteristics under pressure. The horizontal axis represents the applied pressure (0-40 kPa), and the vertical axis represents the normalized resistance change rate (ΔR / R0). The three curves in the figure correspond to the responses under ammonia (NH3) concentrations of 10 ppm, 50 ppm, and 100 ppm, respectively.

[0064] As the applied pressure increases, the overall conductive path of the sensor undergoes compression, and the baseline of each curve decreases overall, indicating that the sensor resistance decreases as the sponge structure is compressed, thus verifying its pressure-sensitive function. Under the same pressure, the ΔR / R0 values ​​corresponding to different gas concentrations show significant differences, indicating that the sensor can still effectively distinguish gas concentrations in a pressure environment, demonstrating the independence of the gas-sensitive function.

[0065] In a 40 PPI pore size density structure, high-concentration gas (100 ppm) consistently causes the maximum resistance change. However, in a 50 PPI pore size density structure, when the pressure exceeds approximately 20 kPa, the response of 50 ppm gas exceeds that of 100 ppm gas. This phenomenon is caused by the regulatory effect of sponge pore size on gas diffusion and surface reaction. For a 50 PPI sponge with a smaller pore size, under higher pressure, high-concentration gas may reach the saturation threshold of the gas-sensitive material's adsorption sites in a localized area due to the reduction in the sponge's effective porosity. This leads to a gradual or even decreasing increase in the response signal, resulting in response saturation or a decrease. This demonstrates that pore size structure affects the gas diffusion path and effective reaction area under high pressure conditions, exhibiting a coupled regulatory effect between pore size, pressure, and concentration, providing a basis for structural parameter optimization.

[0066] Figure 6 This is a curve showing the displacement versus pressure of the dual-function sensor described in this embodiment of the invention, with and without the gas-sensitive sensing element assembled. (Refer to...) Figure 6 As can be seen, the blue curve corresponds to the sensor without a gas-sensitive element, that is, the displacement change with increasing pressure without the installation of four gas-sensitive sponges. In this example, when the pressure reaches about 20 kPa, its ΔX value has reached near the full scale of the vertical axis (10 mm), showing a relatively significant deformation or displacement response. The yellow curve corresponds to the sensor equipped with a gas-sensitive element (the sensor described in the embodiment), that is, the displacement change with increasing pressure with the installation of four gas-sensitive sponges. It can be seen that under the same pressure conditions, the ΔX value of this curve is significantly lower than that of the first curve. When the pressure reaches about 20 kPa, its ΔX value is much lower than 10 mm. When the pressure reaches about 40 kPa, its ΔX value only increases slightly, indicating that its pressure-displacement response characteristics are more moderate.

[0067] The aforementioned changes in displacement deformation indirectly demonstrate that, compared to the state without the gas-sensitive sponge, the device or component equipped with the gas-sensitive sponge described in this invention exhibits a significantly reduced displacement or deformation under the same external pressure. This strongly proves that the gas-sensitive sponge described in this invention has the characteristics of buffering, absorbing, or regulating pressure response, thereby effectively reducing the macroscopic displacement of the pressure-bearing component. Therefore, this structure has significant advantages in expanding the pressure measurement range, flexible sensing, and shock absorption to make signal measurement more stable.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flexible olfactory / tactile dual-function sensor, characterized by, include: Upper electrode (3), lower electrode (4), and pressure-sensitive sensor (1) and gas-sensitive sensor (2) located between the upper electrode (3) and the lower electrode (4); The pressure-sensitive sensor (1) includes a flexible cube (11), and the gas-sensitive sensor (2) includes four flexible side plates (21); the four flexible side plates (21) are symmetrically fixed to the four sides of the flexible cube (11) in pairs, and together form a cubic space area that is fitted and assembled with the flexible cube (11). The upper electrode (3) and the lower electrode (4) are electrically connected to the top and bottom surfaces of the flexible cube (11) and the flexible side plate (21), respectively; The flexible cube (11) is a porous sponge filled with conductive material; the conductive material is at least one of carbon nanotubes, graphite, carbon black or silver nanowires, and the porous sponge is polyurethane sponge or PDMS sponge. The flexible side plate (21) is a porous sponge loaded with quantum dot material; the quantum dot material is at least one of PbS quantum dots, SnO2 nanowires, WO3 nanowires, polyaniline, polypyrrole or graphene oxide, and the porous sponge is polyurethane sponge or PDMS sponge. The upper electrode (3) includes a pressure-sensitive signal electrode and four gas-sensitive signal electrodes that are insulated from each other. The pressure-sensitive signal electrode is electrically connected to the flexible cube (11), and the four gas-sensitive signal electrodes are electrically connected to the four flexible side plates (21) respectively. The lower electrode (4) includes a full-surface electrode that is electrically connected to both the flexible cube (11) and the flexible side plates (21).

2. The flexible olfactory / tactile dual functional sensor according to claim 1, wherein, The four flexible side plates (21) are all isosceles trapezoidal side plates, and each pair of them is adjacent to each other with one hypotenuse of the trapezoidal side plate to form the cubic space region.

3. The flexible olfactory / tactile dual functional sensor according to claim 1, wherein, The upper electrode (3) is a flexible substrate with a patterned conductive metal layer deposited on its surface. The patterned conductive metal layer includes a first region conductive metal layer and four second region conductive metal layers. The four second region conductive metal layers are symmetrically distributed around the first region conductive metal layer and are isolated from each other. The lower electrode (4) is a flexible substrate with a full-surface conductive metal layer deposited on its surface.

4. The flexible olfactory / tactile dual functional sensor according to claim 1, wherein, The sensor also includes an upper flexible encapsulation layer (5) and a lower flexible encapsulation layer (6). The upper flexible encapsulation layer (5) and the lower flexible encapsulation layer (6) are located on the side surfaces of the upper electrode (3) and the lower electrode (4) away from the pressure-sensitive sensor (1) and the gas-sensitive sensor (2), respectively.

5. A method for preparing the flexible olfactory / tactile dual functional sensor according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. The pressure-sensitive material is made into a flexible cube (11), and the gas-sensitive material is made into four flexible side plates (21). S2. Fix the four flexible side plates (21) symmetrically to the four sides of the flexible cube (11) and enclose them to form a cubic space area that is fitted and assembled with the flexible cube (11) to obtain the pressure-sensitive sensor (1) and the gas-sensitive sensor (2). S3. After the electrode material is made into upper electrode (3) and lower electrode (4), it is attached to the top and bottom surfaces of the flexible cube (11) and flexible side plate (21) in the pressure-sensitive sensor (1) and the gas-sensitive sensor (2), respectively, to obtain the flexible olfactory / tactile dual-function sensor.

6. The method of claim 5, wherein the flexible olfactory / tactile dual functional sensor is prepared by the steps of: In step S1, the porous sponge is cut and filled with conductive material to form a flexible cube (11); the porous sponge is cut and loaded with quantum dot material to form four flexible side plates (21).

7. The method of claim 5 or 6, wherein the flexible olfactory / tactile dual functional sensor is prepared by the steps of: Also includes: S4. After the encapsulation material is made into an upper flexible encapsulation layer (5) and a lower flexible encapsulation layer (6), it is attached to the surface of the upper electrode (3) and the lower electrode (4) away from the pressure-sensitive sensor (1) and the gas-sensitive sensor (2), respectively.

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