Moisture self-powered multi-gas detection flexible sensing array and preparation method thereof

Abstract

The invention relates to the technical field of sensors, and discloses a moisture self-energized multi-gas detection flexible sensing array and a preparation method thereof, the moisture self-energized multi-gas detection flexible sensing array comprises a flexible substrate, and the flexible substrate is provided with a moisture self-energized array. According to the moisture self-energized multi-gas detection flexible sensing array and the preparation method thereof, the moisture self-energized array, the supercapacitor energy storage unit and the gas detection flexible sensing array are arranged, moisture is adopted to supply energy to the device, the moisture is everywhere in a normal environment, and when the moisture is in contact with an energy supply material, the energy supply material can supply energy to the supercapacitor energy storage unit. The gas sensor can continuously generate voltage of hundreds of millivolts, so that the device has high environmental adaptability, electric energy is collected for power supply through the supercapacitor energy storage unit, a voltage signal is output through the divider resistor, and voltage signals of different magnitudes are generated when the gas acts on the sensor. A gas sensitive material in the gas detection flexible sensing array adopts a polyaniline composite material, and different composite materials can selectively detect different gases.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and particularly to a humidity self-powered multi-gas detection flexible sensing array and a preparation method thereof. Background Art

[0002] Toxic gases include NH3, NO2, HCHO, ethylenediamine, etc. After these gases enter the human body through the respiratory system, they may cause harm to internal organs, inhibit the metabolic capacity of tissues or cells, lead to hypoxia and asphyxiating poisoning. In addition, colorless, odorless, flammable and explosive gases such as hydrogen are difficult to detect when leaking. Therefore, it is crucial to develop portable sensors to monitor these toxic and harmful gases in real time.

[0003] However, there are many problems with current portable multi-gas sensors. For the power supply system: battery power supply is simple, but it will increase the volume and weight of the sensor. Solar power supply depends on light conditions. Piezoelectric power supply requires continuous pressure application. Thermoelectric power supply requires heating on a small area. For the gas detection unit, there are problems such as poor selectivity and high working temperature, which are not suitable for the integration of planar array sensors. Therefore, a humidity self-powered multi-gas detection flexible sensing array and a preparation method thereof are proposed to solve the above problems. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a humidity self-powered multi-gas detection flexible sensing array and a preparation method thereof, which have the advantages of not requiring batteries, light or heat as energy sources and having strong environmental adaptability, and solve the problems that there are many problems with current portable multi-gas sensors. For the power supply system: battery power supply is simple, but it will increase the volume and weight of the sensor. Solar power supply depends on light conditions. Piezoelectric power supply requires continuous pressure application. Thermoelectric power supply requires heating on a small area. For the gas detection unit, there are problems such as poor selectivity and high working temperature, which are not suitable for the integration of planar array sensors.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions: A humidity self-powered multi-gas detection flexible sensing array, including a flexible substrate, a humidity self-powered array is arranged on the flexible substrate, a supercapacitor energy storage unit is arranged on the flexible substrate, a gas detection flexible sensing array is arranged on the flexible substrate, a printed wire is arranged on the flexible substrate, and a voltage dividing resistor is arranged on the printed wire.

[0008] Preferably, the flexible substrate is made of one of PDMS film, TPU film or PET film.

[0009] Preferably, the functional materials of the moisture self-powered array include graphene, graphene oxide, reduced graphene oxide, carbon nanotubes, and carbon fibers.

[0010] Preferably, the moisture self-powered array is fabricated by screen printing and the active metal reduction method, i.e., one end of the functional material is in contact with the active metal to construct a heterostructure.

[0011] Preferably, the active metals include magnesium, aluminum, zinc, copper, and nickel.

[0012] Preferably, the gas detection flexible sensing array is fabricated by screen printing to form interdigital electrodes.

[0013] Preferably, the gas-sensitive material in the gas detection flexible sensing array is a polyaniline composite material, and the polyaniline composite materials include polyaniline / WS2 material, polyaniline / Pt, polyaniline / In2S3, polyaniline / ZnO, polyaniline / SnO2, and polyaniline / rGO.

[0014] A preparation method of a moisture self-powered multi-gas detection flexible sensing array includes the following steps:

[0015] S1. Select a suitable flexible substrate, clean and perform surface treatment to ensure subsequent material adhesion and sensor performance;

[0016] S2. Use printing technology to print printed wires on the flexible substrate for transmitting electrical signals;

[0017] S3. Prepare a voltage dividing resistor structure on the flexible substrate for voltage division and processing of sensor signals;

[0018] S4. Through screen printing, prepare a moisture self-powered array on the flexible substrate, including a heterostructure constructed by the contact of functional materials and active metals;

[0019] S5. Prepare a supercapacitor energy storage unit on the flexible substrate for storing energy to supply power for the sensor to work;

[0020] S6. Assemble the above-prepared components together to form a complete gas detection flexible sensing array, and test and debug the prepared sensor to ensure its stable performance and excellent sensitivity.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, the present invention provides a moisture self-powered multi-gas detection flexible sensing array and a preparation method thereof, having the following beneficial effects:

[0023] The humidity self-powered multi-gas detection flexible sensing array and its preparation method, by setting a humidity self-powered array, a supercapacitor energy storage unit, and a gas detection flexible sensing array, uses humidity to supply energy for the device itself. Humidity is ubiquitous in the normal environment. When humidity comes into contact with the energy supply material, it will continuously generate a voltage of up to hundreds of millivolts, so that the overall device can achieve the purpose of having strong environmental adaptability. The supercapacitor energy storage unit collects electrical energy for power supply, and the voltage signal is output through a voltage-dividing resistor. When gas acts on the sensor, voltage signals of different magnitudes will be generated. At the same time, the gas-sensitive material in the gas detection flexible sensing array uses a polyaniline composite material. The addition of polyaniline can make the sensor work stably at room temperature, and different composite materials can selectively detect different gases. Brief Description of the Drawings

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a humidity self-powered multi-gas detection flexible sensing array of the present invention;

[0025] Figure 2 It is a process schematic diagram of a preparation method of a humidity self-powered multi-gas detection flexible sensing array of the present invention.

[0026] In the figure: 1 flexible substrate, 2 humidity self-powered array, 3 supercapacitor energy storage unit, 4 gas detection flexible sensing array, 5 printed wire, 6 voltage-dividing resistor. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1-2 , a humidity self-powered multi-gas detection flexible sensing array, including a flexible substrate 1, a humidity self-powered array 2 is arranged on the flexible substrate 1, a supercapacitor energy storage unit 3 is arranged on the flexible substrate 1, a gas detection flexible sensing array 4 is arranged on the flexible substrate 1, a printed wire 5 is arranged on the flexible substrate 1, and a voltage-dividing resistor 6 is arranged on the printed wire 5.

[0029] Furthermore, the overall size of the flexible sensor device is 50mm×100mm.

[0030] Furthermore, the moisture self-powered array 2 constructs a heterostructure using the active metal reduction method, which can generate a weak current by absorbing moisture in the surrounding environment to provide energy for the sensor. The gas detection flexible sensing array 4 enhances sensitivity and stability through the interdigital electrode design and can detect changes in the concentration of surrounding gases. The supercapacitor energy storage unit 3 is used to store the weak current energy generated by the moisture self-powered array to ensure the continuous and stable operation of the sensor.

[0031] Furthermore, when the moisture self-powered array 2 absorbs moisture and generates a weak current, the supercapacitor energy storage unit 3 stores the energy. The sensor is connected to the moisture self-powered array 2 and the supercapacitor energy storage unit 3 through the printed wire 5 and the voltage dividing resistor 6 to achieve the functions of energy collection and gas detection. When the gas concentration changes, the interdigital electrodes of the sensor will respond and generate signals, and through cooperation with the gas detection flexible sensing array 4, the function of multi-gas detection is achieved.

[0032] Specifically, the flexible substrate 1 is made of one of PDMS film, TPU film or PET film.

[0033] Furthermore, the PDMS in the PDMS film (polydimethylsiloxane) has excellent flexibility, wear resistance and chemical stability, which is very suitable for sensor applications that require high flexibility and durability.

[0034] Furthermore, the TPU in the TPU film (thermoplastic polyurethane) has excellent elasticity and wear resistance, and is suitable for sensor applications that require high tensile properties and wear resistance.

[0035] Furthermore, the PET in the PET film (polyethylene terephthalate) has excellent mechanical strength, heat resistance and chemical stability, and is suitable for sensor applications that require high mechanical strength and heat resistance.

[0036] Specifically, the functional materials of the moisture self-powered array 2 include graphene, graphene oxide, reduced graphene oxide, carbon nanotubes and carbon fibers.

[0037] Furthermore, graphene has extremely high electrical conductivity, which can effectively enhance the conduction of current and improve the sensitivity of the sensor. Moreover, it has extremely high strength and flexibility, enabling it to withstand deformation without damage in flexible sensors. At the same time, graphene has a large specific surface area, which helps to improve the gas adsorption capacity, thereby enhancing the response speed and sensitivity of the sensor.

[0038] Furthermore, graphene oxide is easily dispersed in water and other solvents, facilitating the preparation of uniform composites. Different functional groups can be introduced through chemical modification to enhance its interaction with target gases. Moreover, the conductivity of graphene oxide can be adjusted through the reduction process, which is suitable for different sensor requirements.

[0039] Furthermore, compared with graphene oxide, reduced graphene oxide has higher conductivity, exhibits good sensitivity and selectivity in gas sensors, and has good gas detection capabilities.

[0040] Furthermore, carbon nanotubes have high electrical conductivity and strength, which can effectively enhance the overall performance of the sensor. The high specific surface area of ​​carbon nanotubes can improve the gas adsorption capacity and enhance the response ability of the sensor. At the same time, the flexibility of carbon nanotubes makes them suitable for use in flexible electronic devices.

[0041] Furthermore, carbon fiber has extremely high strength and lightweight properties, making it suitable for applications that require strength and lightness. It also has certain conductivity and can be used as a conductive additive in composite materials. It can also maintain stability in high-temperature environments and is suitable for certain high-temperature gas detection applications.

[0042] Specifically, the moisture self-powered array 2 is manufactured by screen printing and adopts an active metal reduction method, that is, one end of the functional material is in contact with the active metal to construct a heterostructure, wherein the active metals include magnesium, aluminum, zinc, copper and nickel. The heterostructure constructed by the active metal reduction method can improve the conductivity of the functional material and further enhance the current conduction efficiency of the sensor. The design of the heterostructure may increase the specific surface area of ​​the functional material and improve its gas adsorption performance, thereby improving the detection sensitivity of the sensor to gases such as moisture. Moreover, the construction of the heterostructure can change the surface properties of the functional material, which may lead to faster gas adsorption and desorption processes, thereby improving the response speed of the sensor. At the same time, the heterostructure constructed by the active metal reduction method may improve the bonding strength between the functional material and the metal, and increase the stability and durability of the sensor.

[0043] Specifically, the gas detection flexible sensor array 4 uses a screen printing method to manufacture interdigitated electrodes.

[0044] Furthermore, manufacturing interdigitated electrodes through screen printing can improve the sensitivity of the sensor, making it easier to detect small changes in gas concentration. The design of the interdigitated electrodes can increase the surface area of ​​the sensor in contact with the detected gas, improve stability and repeatability, and make the sensor more reliable. Moreover, screen printing is a simple and low-cost manufacturing method that can reduce production costs and improve the competitiveness of the sensor.

[0045] Specifically, the gas-sensitive material in the gas detection flexible sensing array 4 is a polyaniline composite material, and the polyaniline composite material includes polyaniline / WS2 material, polyaniline / Pt, polyaniline / In2S3, polyaniline / ZnO, polyaniline / SnO2 and polyaniline / rGO.

[0046] Furthermore, the addition of polyaniline enables the sensor to work stably at room temperature. Different composite materials can selectively detect different gases. Among them, the polyaniline / WS2 material is responsible for detecting NH3, the polyaniline / Pt is responsible for detecting H2, the polyaniline / In2S3 is responsible for detecting NO2, the polyaniline / ZnO is responsible for detecting HCHO, the polyaniline / SnO2 is responsible for detecting ethylenediamine, and the polyaniline / rGO is responsible for detecting humidity.

[0047] A preparation method of a moisture self-powered multi-gas detection flexible sensing array includes the following steps:

[0048] S1. Select a suitable flexible substrate 1, and perform cleaning and surface treatment to ensure subsequent material adhesion and sensor performance;

[0049] S2. Use printing technology to print printed wires 5 on the flexible substrate 1 for transmitting electrical signals;

[0050] S3. Prepare a voltage-dividing resistor 6 structure on the flexible substrate 1 for voltage division and processing of sensor signals;

[0051] S4. By means of screen printing, prepare a moisture self-powered array 2 on the flexible substrate 1, including a heterostructure constructed by a functional material and an active metal contact;

[0052] S5. Prepare a supercapacitor energy storage unit 3 on the flexible substrate 1 for storing energy for the sensor to work;

[0053] S6. Assemble the above-prepared components together to form a complete gas detection flexible sensing array, and test and debug the prepared sensor to ensure its stable performance and excellent sensitivity.

[0054] In summary, for the moisture self-powered multi-gas detection flexible sensing array and its preparation method, by setting the moisture self-powered array 2, the supercapacitor energy storage unit 3, and the gas detection flexible sensing array 4, moisture is used to power the device itself. Moisture is ubiquitous in the normal environment. When moisture comes into contact with the energy supply material, a voltage of up to hundreds of millivolts will be continuously generated, so that the overall device achieves the purpose of having strong environmental adaptability. The electric energy is collected and supplied through the supercapacitor energy storage unit 3, and the voltage signal is output through the voltage dividing resistor 6. When the gas acts on the sensor, voltage signals of different magnitudes will be generated. At the same time, the gas-sensitive material in the gas detection flexible sensing array 4 uses a polyaniline composite material. The addition of polyaniline enables the sensor to work stably at room temperature, and different composite materials can selectively detect different gases, solving many problems existing in current portable multi-gas sensors. For the energy supply system: battery power supply is simple, but it will increase the volume and weight of the sensor. Solar power supply depends on light conditions, piezoelectric power supply requires continuous pressure application, and thermoelectric power supply requires heating on a small area. For the gas detection unit, there are problems such as poor selectivity and high working temperature, which are not suitable for the integration of planar array sensors.

[0055] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A moisture self-powered multi-gas detection flexible sensor array, comprising a flexible substrate (1), characterized in that: A moisture self-powered array (2) is arranged on the flexible substrate (1), a supercapacitor energy storage unit (3) is arranged on the flexible substrate (1), a gas detection flexible sensor array (4) is arranged on the flexible substrate (1), a printed conductor (5) is arranged on the flexible substrate (1), and a voltage divider resistor (6) is arranged on the printed conductor (5).

2. The moisture self-powered multi-gas detection flexible sensor array according to claim 1, characterized in that: The flexible substrate (1) is one of a PDMS film, a TPU film or a PET film.

3. The moisture self-powered multi-gas detection flexible sensor array according to claim 1, characterized in that: The functional materials of the moisture self-powered array (2) include graphene, graphene oxide, reduced graphene oxide, carbon nanotubes and carbon fibers.

4. The moisture self-powered multi-gas detection flexible sensor array according to claim 1, characterized in that: The moisture self-powered array (2) is manufactured by a screen printing method and an active metal reduction method, that is, one end of the functional material is in contact with the active metal to construct a heterogeneous structure.

5. The moisture self-powered multi-gas detection flexible sensor array according to claim 4, characterized in that: The active metals include magnesium, aluminum, zinc, copper and nickel.

6. The moisture self-powered multi-gas detection flexible sensor array according to claim 1, characterized in that: The gas detection flexible sensor array (4) adopts a screen printing method to manufacture interdigitated electrodes.

7. The moisture self-powered multi-gas detection flexible sensor array according to claim 1, characterized in that: The gas-sensitive material in the gas detection flexible sensor array (4) is a polyaniline composite material, and the polyaniline composite material includes polyaniline / WS2 material, polyaniline / Pt, polyaniline / In2S3, polyaniline / ZnO, polyaniline / SnO2 and polyaniline / rGO.

8. The method for preparing a moisture self-powered multi-gas detection flexible sensor array according to claim 1 is applicable to a moisture self-powered multi-gas detection flexible sensor array according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Select a suitable flexible substrate (1), clean it and perform surface treatment to ensure subsequent material adhesion and sensor performance; S2, using printing technology to print a printed conductor (5) on the flexible substrate (1) for transmitting electrical signals; S3, preparing a voltage divider resistor (6) structure on the flexible substrate (1) for voltage division and processing of sensor signals; S4. Preparing a moisture self-powered array (2) on a flexible substrate (1) by screen printing, including a heterostructure constructed of functional materials and active metal contacts; S5, preparing a supercapacitor energy storage unit (3) on the flexible substrate (1) for storing energy for the sensor to work; S6. Assemble the above-prepared components together to form a complete gas detection flexible sensor array, and test and debug the prepared sensors to ensure their stable performance and excellent sensitivity.

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