Gas sensor fabrication method, sampling unit and monitoring system

Abstract

This application discloses a method for fabricating a gas sensor, a sampling unit, and a monitoring system. The fabrication method is characterized by comprising: obtaining a metal oxide nanorod array using an electron beam evaporation vacuum coating machine via a tilted growth method; doping the metal oxide nanorod array with a target metal during or after the growth process to obtain a gas sensor; or coating the outside of each metal oxide nanorod in the metal oxide nanorod array with a metal oxide corresponding to the target metal to obtain the gas sensor. By fabricating a sensor that is sensitive to multiple gases in a wine cellar, the sampling capability of gases in the wine cellar is effectively improved.

Description

Technical Field

[0001] This disclosure generally relates to the field of intelligent monitoring technology, and more particularly to a monitoring system for intelligent wine cellars. Background Technology

[0002] In recent years, the baijiu brewing industry has been transitioning from traditional manual brewing to automated brewing. Baijiu brewing includes steps such as crushing, ingredient mixing, moistening and blending, steaming and preserving the fermentation process, cooling and loosening, adding water and yeast, piling, sealing and fermenting in the cellar, and distilling. Among these steps, the sealed fermentation process in the cellar relies heavily on the experience and judgment of the brewer in traditional manual brewing. Because the process is closed, it is impossible to obtain real-time fermentation information inside the cellar, and the sealed fermentation process is greatly affected by preceding processes and the environment, resulting in unstable quality of the brewed baijiu. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a method for preparing a gas sensor, a sampling unit and a monitoring system, so as to effectively improve the sampling capability of gases in the wine cellar by preparing a sensor that is sensitive to a variety of gases in the wine cellar.

[0004] In a first aspect, this application proposes a method for fabricating a gas sensor, comprising:

[0005] Metal oxide nanorods were obtained by tilting growth using an electron beam evaporation vacuum coating machine.

[0006] During or after growth, the target metal is doped into the metal oxide nanorods to obtain a gas sensor; or

[0007] The gas sensor is obtained by coating the outside of the metal oxide nanorod with the metal oxide corresponding to the target metal.

[0008] In some embodiments, an electron beam evaporation mechanism is added to the electron beam evaporation vacuum coating machine, and the doping of the target metal into the metal oxide nanorods during the growth process includes:

[0009] When the metal oxide nanorods are grown in the electron beam evaporation vacuum coating machine, the electron beam evaporation mechanism is controlled to evaporate the target metal into the region where the metal oxide nanorods are grown.

[0010] In some embodiments, the evaporation rate of the added electron beam evaporation mechanism is less than the evaporation rate of the electron beam evaporation mechanism in the electron beam evaporation vacuum coating machine.

[0011] In some embodiments, doping the metal oxide nanorod with the target metal after growth includes:

[0012] The metal oxide nanorods are immersed in a metal solution containing the target metal for a first time.

[0013] The soaked metal oxide nanorods were then immersed in a reducing solution for a second time.

[0014] In some embodiments, before immersing the soaked metal oxide nanorods in the reducing solution for a second time, the soaked metal oxide nanorods are immersed in deionized water for a third time; and

[0015] After soaking the soaked metal oxide nanorods in the reducing solution for a second time, the soaked metal oxide nanorods are then soaked in the deionized water for a fourth time.

[0016] In some embodiments, the metal oxide nanorods are coated with a metal oxide corresponding to the target metal, including:

[0017] The metal oxide nanorods are placed inside the reaction chamber;

[0018] A first gaseous reactant is injected into the reaction chamber to obtain the metal oxide nanorods coated with the first gaseous reactant, wherein the first gaseous reactant contains the target metal;

[0019] A second gaseous reactant is introduced into the reaction chamber to allow the second gaseous reactant to react chemically with the first gaseous reactant coated on the metal oxide nanorods, thereby obtaining the metal oxide corresponding to the target metal.

[0020] In some embodiments, the metal oxide nanorods are ZnO2 nanorods or In2O3 nanorods, and the target metal is one or more of Pd, Ag, Au, Ti, and Sn.

[0021] Secondly, this application proposes a gas sampling unit, which includes a gas sensor array, wherein multiple gas sensors in the gas sensor array are prepared by the gas sensor preparation method.

[0022] Thirdly, this application proposes a smart monitoring system, including the aforementioned gas sampling unit;

[0023] The gas sampling unit is located in the upper region inside the device under test and is used to sample different gases in the upper region of the device under test.

[0024] In some embodiments, the monitoring system further includes a temperature sensor, a circulating temperature control unit disposed outside the smart wine cellar, and a control unit, wherein the temperature sensor and the circulating temperature control unit are respectively connected to the control unit;

[0025] The control unit is used to receive the current temperature collected by the temperature sensor, and control the circulating temperature control unit to adjust the temperature of the device under test according to the current temperature.

[0026] In some embodiments, the monitoring system includes at least three temperature sensors, which are respectively disposed in the upper, middle, and lower regions of the device under test.

[0027] The control unit controls the circulating temperature control unit located in the corresponding area based on the current temperature collected by the three temperature sensors.

[0028] In some embodiments, the monitoring system further includes a humidity sensor and a humidity adjustment unit, wherein the humidity sensor and the humidity adjustment unit are respectively connected to the control unit;

[0029] The control unit is used to control the humidity adjustment unit to adjust the humidity of the upper area of ​​the device under test according to the current humidity collected by the humidity sensor.

[0030] In some embodiments, the monitoring system further includes a liquid sampling unit connected to the control unit;

[0031] The control unit is used to perform quantitative analysis on the liquid collected by the liquid sampling unit.

[0032] In some embodiments, the device to be tested is a wine cellar.

[0033] The intelligent monitoring system provided in this application embodiment can detect the gas generated in the sealed device under test. By using multiple gas sensors that are sensitive to a variety of gases, the efficiency and comprehensiveness of gas detection in the device under test can be effectively improved, providing a reliable data foundation for monitoring the device under test.

[0034] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0036] Figure 1 This is a flowchart illustrating a method for fabricating a gas sensor according to an embodiment of this application;

[0037] Figure 2This is a schematic diagram of the structure of a gas sensor proposed in an embodiment of this application;

[0038] Figure 3 for Figure 2 Cross-sectional view of nanorods;

[0039] Figure 4 This is a schematic diagram of another gas sensor proposed in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram illustrating the principle of the atomic deposition process proposed in the embodiments of this application;

[0041] Figure 6 This is a schematic diagram of the structure of another gas sensor proposed in the embodiments of this application;

[0042] Figure 7 for Figure 6 Cross-sectional view of nanorods;

[0043] Figure 8 This is a schematic diagram of an implementation environment for an intelligent monitoring system proposed in an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of another implementation environment for an intelligent monitoring system proposed in an embodiment of this application;

[0045] Figure 10 This is a schematic diagram of the array structure of the gas sampling unit proposed in the embodiments of this application. Detailed Implementation

[0046] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] Figure 1 This application provides a method for preparing a gas sensor.

[0049] like Figure 1 As shown, the method for manufacturing this gas sensor includes:

[0050] 101. Metal oxide nanorod arrays were obtained by tilting growth method using an electron beam evaporation vacuum coating machine.

[0051] 102. During or after growth, the target metal is doped into the metal oxide nanorod array to obtain a gas sensor.

[0052] Among them, adding an electron beam evaporation mechanism to the electron beam evaporation vacuum coating machine to dope the target metal into the metal oxide nanorods during the growth process includes: when growing the metal oxide nanorod array in the electron beam evaporation vacuum coating machine, controlling the addition of the electron beam evaporation mechanism to evaporate the target metal into the region where the metal oxide nanorod array is grown.

[0053] Optionally, the evaporation rate of the electron beam evaporation mechanism can be increased to be less than that of the electron beam evaporation mechanism in the electron beam evaporation vacuum coating machine.

[0054] For example, the angle of the substrate stage is controlled to be 80°-88°, and the back vacuum of the vacuum chamber is 5×10⁻⁶. -5 Pa—1×10 -4 Pa, controlling the evaporation rate of the metal oxide to be The evaporation rate of the doped metal is Simultaneous evaporation using dual electron beams is employed, and coating is stopped when the crystal oscillator reading in the vacuum coating machine reaches 500nm-1000nm. In other words, following the... When preparing ZnO2 nanorod arrays at a certain evaporation rate, the electron beam is increased according to... The evaporation rate is used to evaporate one or more of the metals Pd, Ag, and Au to obtain a gas sensor containing the target metal Pd, Ag, or Au, or, according to... When preparing a gas sensor using an In₂O₃ nanorod array, the evaporation rate was increased according to... The evaporation rate is used to evaporate metallic Al to obtain a gas sensor containing the target metallic Al.

[0055] Specifically, when the gas sensor is a ZnO2 gas sensor containing the target metal Pd, the gas sensor is used to detect H2 and alcohol gases, such as ethanol, butanol, pentanol, and other alcohol gases; when the gas sensor is a ZnO2 gas sensor containing the target metal Ag or Au, the gas sensor is used to detect ketones, such as acetone, heptanone, 2-octanone, and other ketone gases.

[0056] For example, a gas sensor obtained by doping a target metal into a metal oxide nanorod array during growth, such as... Figure 2 As shown, the cross-sectional structure of any one of the nanorods is as follows: Figure 3As shown, the target metal is uniformly doped in the nanorods, which can effectively increase the content of the target metal in the gas sensor, thereby improving the sensitivity and detection life of the gas sensor.

[0057] It should be understood that the doping method for preparing gas sensors is generally applicable to metal oxide gas sensors that are composites of the metal itself (e.g., metal atoms). However, since this method is costly, for metals with liquid metal compounds, such as noble metals, a lower-cost method of surface modification can be used to prepare composite metal oxide gas sensors.

[0058] In one feasible embodiment, doping the metal oxide nanorod array with a target metal after growth includes: immersing the metal oxide nanorod array in a metal solution containing the target metal for a first time; and immersing the immersed metal oxide nanorod array in a reducing solution for a second time.

[0059] Optionally, before immersing the soaked metal oxide nanorod array in the reducing solution for a second time, the soaked metal oxide nanorod array is immersed in deionized water for a third time; and after immersing the soaked metal oxide nanorod array in the reducing solution for a second time, the soaked metal oxide nanorod array is immersed in deionized water for a fourth time.

[0060] For example, when preparing metal oxide nanorod arrays using an electron beam evaporation vacuum deposition machine via tilted growth, the angle of the substrate stage is controlled to be 80°-88°, and the background vacuum of the vacuum chamber is 5×10⁻⁶. -5 Pa—1×10 -4 Pa, controlling the evaporation rate of the metal oxide to be When the crystal oscillator reading of the vacuum coating machine reaches 500nm-1000nm, the coating process is stopped, resulting in a substrate for the metal oxide nanorod array. The substrate is then immersed in a metal solution (an acidic solution modifying the metal) for a specific immersion time to allow the metal solution to reach adsorption equilibrium. The substrate is then removed and placed in a deionized solution to remove excess metal solution. Next, the substrate is placed in a reducing solution, where the metal substances originally adsorbed on the substrate react chemically with substances in the reducing solution, achieving metal doping of the metal oxide gas sensor. This process of immersing the substrate in the metal solution and reducing solution is repeated until the target metal doping level on the metal oxide nanorod array reaches the desired level. The target metal doping level can be adjusted by changing the number of cycles and the solution concentration.

[0061] The metal solution can be one of the following: chloroauric acid (HAuCl4) at a concentration of 0.1 mg / mL, chloroplatinic acid (HPt2Cl6) at a concentration of 0.1 mg / mL, or silver nitrate (AgNO3) aqueous solution at a concentration of 0.1 mg / mL. The reducing solution can be sodium borohydride (NaBH4) aqueous solution at a concentration of 1 mg / mL. During the doping process, the substrate is kept in the metal solution and the reducing solution for 1 minute each, and then in deionized water for 30 seconds. This yields a gas sensor doped with metal particles with a diameter of 5-80 nm.

[0062] For example, such as Figure 4 As shown, the left side shows a metal oxide nanorod array prepared using an electron beam evaporation vacuum coating machine, and the right side shows a gas sensor doped with the target metal.

[0063] 103. A gas sensor is obtained by coating the outside of each metal oxide nanorod in the metal oxide nanorod array with the metal oxide corresponding to the target metal.

[0064] In one feasible embodiment, coating the outside of each metal oxide nanorod in the metal oxide nanorod array with a metal oxide corresponding to the target metal includes: placing the metal oxide nanorod array in a reaction chamber; injecting a first gaseous reactant into the reaction chamber to obtain metal oxide nanorods coated with the first gaseous reactant, the first gaseous reactant containing the target metal; and injecting a second gaseous reactant into the reaction chamber to allow the second gaseous reactant to react chemically with the first gaseous reactant coated on the metal oxide nanorods to obtain a metal oxide corresponding to the target metal.

[0065] It should be understood that this method involves using atomic layer deposition equipment to prepare metal oxides for containing the target metal on the outside of metal oxide nanorods.

[0066] For example, the process of preparing oxides using an atomic layer deposition (ALD) device involves using nitrogen as a carrier gas to carry gaseous metal precursors and deionized water vapor. Specifically, nitrogen carries different gaseous reactants at different reaction stages. The amount of gaseous metal precursors and water vapor introduced is controlled by a gas flow meter to achieve nanoscale oxide film deposition on the sensor substrate. Specifically, the gaseous metal precursors and water vapor are alternately introduced for adsorption and alternating layering reactions, resulting in an atomic-layer-scale film after the chemical reaction. Figure 5This is a schematic diagram of the atomic deposition process. A pulsed carrier gas propels a nitrogen-carried gaseous metal precursor into the reaction chamber. During its residence, the gaseous metal precursor gradually undergoes chemical adsorption and adheres to the substrate surface. After a set time, it reaches saturation, and the unadsorbed gas is then pumped away by a mechanical pump. Next, nitrogen-carried deionized water vapor reactants are introduced. Similarly, due to the adsorption principle, they also adhere to the substrate surface. However, since the gaseous metal precursor has already been adsorbed, the water vapor naturally reacts chemically with the gaseous metal precursor attached to the substrate surface. After a complete reaction, the unreacted substances are removed. Through this reaction process, a thin film formed by a single atomic layer of oxide can be obtained. After several alternating cycles, multiple atomic layers are stacked, resulting in a nanoscale metal oxide film coating the outside of the metal oxide gas sensor.

[0067] The thickness of the metal oxide used for coating can be accurately obtained by controlling the temperature and setting the number of deposition cycles.

[0068] For example, when preparing metal oxide nanorod arrays using an electron beam evaporation vacuum deposition machine via a tilted growth method, the angle of the substrate stage is controlled to be 80°-88°, and the background vacuum of the vacuum chamber is 5×10⁻⁶. -5 Pa—1×10 -4 Pa, controlling the evaporation rate of the metal oxide to be When the reading of the crystal oscillator of the vacuum coating machine is between 500nm and 1000nm, the coating is stopped to obtain the substrate of the metal oxide nanorod array.

[0069] Then, using tetra(dimethylamino)tin as the gaseous reactant and deionized water vapor, the reaction temperature was 70℃-100℃, and the number of deposition cycles was 10-100, thus obtaining ZnO2 nanorod arrays coated with SnO2 with a thickness of 5-70 nm. Similarly, ZnO2 nanorods coated with TiO2 with a thickness of 7-70 nm can also be prepared using tetra(dimethylamino)titanium. Among them, the SnO2-coated ZnO2 nanorod arrays have high sensitivity to nitrogen oxides, while the TiO2-coated ZnO2 nanorod arrays have good sensitivity to oxygen, carboxylic acids (such as acetic acid, lactic acid, propionic acid, butyric acid, etc.), and aldehydes (furfural).

[0070] Specifically, the atomic layer deposition reaction equations for SnO2 and TiO2 are as follows:

[0071] Sn(N(CH3)2)4+2H2O→SnO2+4HN(CH3)2↑

[0072] Ti(N(CH3)2)4+2H2O→TiO2+4HN(CH3)2↑

[0073] In other words, in the atomic layer deposition reaction of SnO2 and TiO2, deionized water is water H2O.

[0074] Among them, such as Figure 6 As shown, the left side shows a metal oxide nanorod array prepared using an electron beam evaporation vacuum coating machine, and the right side shows a gas sensor coated with metal oxide. Figure 7 This is a cross-sectional view of any nanorod in the nanorod array, which shows that the internal and external materials of the nanorod are different.

[0075] Therefore, the gas sensor method proposed in this application can prepare a variety of gas sensors that are sensitive to different types of gases, effectively improve the detectable range of the gas sensor, and have a good detection effect within the detectable range.

[0076] Figure 8 This is a schematic diagram of the implementation environment of the intelligent monitoring system proposed in this application embodiment.

[0077] Taking the equipment to be tested as a wine cellar as an example, such as Figure 8 and Figure 9 As shown, the intelligent wine cellar 100 is used for sealed storage of wine for fermentation. The intelligent wine cellar 100 is typically a cylindrical structure. Before sealed fermentation, the wine to be fermented is poured into the intelligent wine cellar 100.

[0078] In one feasible embodiment, the wine is poured to a height less than 2 / 3 of the cellar's height to allow sufficient space for storing gases produced during fermentation. For example, the wine to be fermented is filled to 2 / 3 of the height of the intelligent cellar 100, naturally forming an upper, middle, and lower layer. The upper layer stores gases produced during fermentation, such as alcohols and esters; the middle layer stores the fermenting wine; and the lower layer stores the wine and precipitated solids, such as sediment.

[0079] In one feasible embodiment, the intelligent wine cellar 100 is also equipped with multiple temperature sensors 10, which can be respectively set in the upper, middle and lower areas of the intelligent wine cellar 100 to detect the temperature of different substances contained in the intelligent wine cellar 100.

[0080] For example, the smart wine cellar 100 is equipped with three temperature sensors 10, which are respectively installed on the inner walls of the upper, middle, and lower areas of the smart wine cellar 100. Figure 9As shown, the stability of the temperature sensors can be improved by utilizing the inner wall of the smart wine cellar 100. Alternatively, a hanging arm can be installed from the top cover of the smart wine cellar 100, extending into the interior of the cellar, with three temperature sensors 10 mounted on the arm, such as... Figure 8 This is shown so that when the boom is lowered into the wine cellar, the three temperature sensors 10 are located in the upper, middle and lower areas of the wine cellar, respectively, so that the temperature sensors 10 can be fully integrated into the substance being measured, thereby improving the reliability of temperature sampling.

[0081] In one feasible embodiment, the smart wine cellar 100 is further provided with a control unit 20 connected to the temperature sensors 10. The control unit 20 is communicatively connected to each temperature sensor 10 to receive the current temperature collected by the temperature sensor 10.

[0082] Furthermore, the exterior of the intelligent wine cellar 100 is also covered with a circulating temperature control unit 30, which is communicatively connected to the control unit 20 and is used to receive and execute the temperature adjustment command issued by the control unit 20 based on the current temperature collected by the temperature sensor 10.

[0083] In other words, after the intelligent wine cellar 10 is sealed and working, the temperature sensor 10 collects the current temperature in the wine cellar in real time. The control unit 20 compares the current temperature collected by the temperature sensor 10 with the preset fermentation temperature and controls the circulating temperature control unit 30 according to the comparison result.

[0084] Specifically, when the current temperature is lower than the preset fermentation temperature, the control unit 20 controls the circulating temperature control unit 30 to heat the smart wine cellar 100; when the current temperature is higher than the preset fermentation temperature, the control unit 20 controls the circulating temperature control unit 20 to cool the smart wine cellar 100; and when the current temperature is equal to the preset fermentation temperature, the control unit 20 controls the circulating temperature control unit 30 to shut down.

[0085] Optionally, the medium of the circulating temperature control unit 30 can be a flowing medium, so as to circulate and regulate the temperature of the smart wine cellar 10 through the flow of the flowing medium.

[0086] Optionally, there may be multiple circulating temperature control units 30, and the coverage area may correspond to the temperature sensor 10. For example, the control unit 20 can obtain the current temperature collected by the temperature sensor 10 located in the lower layer of the smart wine cellar 100, and determine that the current temperature collected by the temperature sensor 10 located in the lower layer of the smart wine cellar 100 is less than the preset fermentation temperature. At this time, the control unit 20 can control the circulating temperature control unit 30 covering the lower layer of the smart wine cellar 100 to heat. At the same time, the control unit 20 can obtain the current temperature collected by the temperature sensor 10 located in the middle layer of the smart wine cellar 100, and determine that the current temperature collected by the temperature sensor 10 located in the middle layer of the smart wine cellar 100 is equal to the preset fermentation temperature. At this time, the control unit 20 can control the circulating temperature control unit 30 covering the middle layer of the smart wine cellar 100 to turn off. Similarly, if the control unit 20 determines that the current temperature collected by the temperature sensor 10 located in the upper layer of the smart wine cellar 100 is greater than the preset fermentation temperature, the control unit can control the circulating temperature control unit 30 covering the upper layer of the smart wine cellar 100 to cool down.

[0087] Optionally, the preset fermentation temperature can be a fixed value to allow the wine to ferment in a stable environment, or it can be set according to different regions and different times. The control unit 20 can determine the relationship between the current temperature and the preset fermentation temperature based on the setting position and sampling time of the temperature sensor 10.

[0088] In one feasible embodiment, the upper area of ​​the intelligent wine cellar 100 is further equipped with a humidity sensor 40 and a humidity regulation unit 50. The humidity sensor 40 and the humidity regulation unit 50 are respectively connected to the control unit 20. The humidity sensor 40 is used to detect the current humidity of the upper area of ​​the intelligent wine cellar 100 and send it to the control unit 20. The humidity regulation unit 50 is used to receive and execute the control commands sent by the control unit 20 according to the current humidity, so as to regulate the humidity state of the intelligent wine cellar 100 and ensure the fermentation effect.

[0089] Optionally, the humidity sensor 40 can be installed on the inner wall of the upper area of ​​the smart wine cellar 100 or inside the top cover, or it can be lowered into the wine cellar via a hanging arm, similar to the temperature sensor 10. The humidity adjustment unit 50 can be installed on the inner wall of the upper area of ​​the smart wine cellar 100 or inside the top cover.

[0090] Specifically, when the current humidity is less than the preset fermentation humidity, the control unit 20 controls the humidity regulating unit 50 to humidify the smart wine cellar 100; when the current humidity is greater than the preset fermentation humidity, the control unit 20 controls the humidity regulating unit 50 to dehumidify the smart wine cellar 100; and when the current humidity is equal to the preset fermentation humidity, the control unit 20 controls the humidity regulating unit 50 to turn off.

[0091] Optionally, the preset fermentation humidity can be a fixed value to allow the wine to ferment in a stable environment, or it can be set according to different times. The control unit 20 can determine the relationship between the current humidity and the preset fermentation humidity based on the sampling time of the humidity sensor 10.

[0092] Optionally, in order to reduce the interaction between the smart wine cellar 100 and the external environment, the humidity control unit 50 may be equipped with a liquid storage tank, which is used to store the liquid obtained from the dehumidification operation and to use the stored liquid for humidification.

[0093] In one feasible embodiment, a gas sampling unit 60 is also provided in the upper area of ​​the smart wine cellar 100. The gas sampling unit 60 is located in the upper area of ​​the smart wine cellar 100 and is used to sample the gas in the smart wine cellar 100.

[0094] Among them, such as Figure 10 As shown, the gas sampling unit 60 may include a sensor array composed of multiple gas sensors. The sensor array may be 3×3 or 3×4. The multiple gas sensors in the sensor array may be sensitive to different fermentation gases. The gas sampling unit 60 detects the gas composition and content in the upper area of ​​the smart wine cellar 100 through the gas sensors.

[0095] In one feasible embodiment, the gas sampling unit 60 can also be connected to the control unit 20 to send sensor features to the control unit 20, which then analyzes the gas composition and content to obtain the gas composition and content.

[0096] Optionally, the gas sensors in the gas sampling unit 60 are all composite metal oxide gas sensors, that is, by combining different metals in the metal oxide gas sensor, the sensitivity of the gas sensor to different gases is improved.

[0097] For example, metal oxide gas sensors using palladium (Pd) composites can improve the detection sensitivity of hydrogen (H2) and alcohols; metal oxide gas sensors using silver (Ag) or gold (Au) composites can improve the specific response to ketones; metal oxide gas sensors using titanium (Ti) composites can improve the detection sensitivity of oxygen, carboxylic acids, and aldehydes; metal oxide gas sensors using tin (Sn) oxide (SnO2) composites can improve the response to nitrogen oxides; and metal oxide gas sensors using aluminum (Al) composites can improve the detection sensitivity of esters such as ethyl acetate and ethyl lactate.

[0098] In one possible embodiment, such as Figure 8 and Figure 9As shown, the monitoring system of the intelligent wine cellar also includes a liquid sampling unit 70, which is connected to a control unit 20. The control unit 20 is used to perform quantitative analysis based on the liquid collected by the liquid sampling unit.

[0099] In summary, the intelligent wine cellar monitoring system provided in this application embodiment can detect the gases generated during the fermentation process in a sealed wine cellar. By using multiple gas sensors that are sensitive to various gases, the efficiency and comprehensiveness of wine cellar gas detection can be effectively improved, providing a reliable data foundation for intelligent monitoring of wine cellars.

[0100] This application provides an electronic device, including a memory and a processor, wherein the memory is connected to the processor, and the memory stores a computer program that, when executed by the processor, implements the phase-shifting method described in any one of the above.

[0101] This application also provides a computer-readable storage medium storing instructions that, when the computer-readable storage medium is run on a computer, cause the computer to perform any of the phase-shifting methods described above.

[0102] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the liquid crystal phase shifter, connecting various parts of the carrier via various interfaces and lines.

[0103] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and by calling data stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store the operating system, at least one application program required for a function, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash eEPROM memory device, or other volatile solid-state storage devices.

[0104] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0105] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0106] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Terms such as “setup” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0107] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.

[0108] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the foregoing disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A method for producing a gas sensor, characterized by, The application relates to a gas sensor and a preparation method thereof. The gas sensor comprises a metal oxide nanorod array and a target metal doped in the metal oxide nanorod array, wherein the metal oxide nanorod array is obtained by an electron beam evaporation vacuum coating machine through a tilt growth method. The gas sensor is obtained by doping a target metal into the metal oxide nanorod array during or after growth, or by coating a metal oxide corresponding to the target metal on the outside of each metal oxide nanorod in the metal oxide nanorod array. The method for doping a target metal into the metal oxide nanorod array after growth comprises the following steps: immersing the metal oxide nanorod array in a metal solution containing the target metal for a first time; immersing the metal oxide nanorod array in deionized water for a third time; immersing the metal oxide nanorod array in a reducing solution for a second time; immersing the metal oxide nanorod array in the deionized water for a fourth time; the immersion time in the metal solution and the reducing solution is longer than the immersion time in the deionized water. The method for coating a metal oxide corresponding to the target metal on the outside of each metal oxide nanorod in the metal oxide nanorod array comprises the following steps: placing the metal oxide nanorod array in a reaction cavity; injecting a first gaseous reactant into the reaction cavity to obtain the metal oxide nanorod coated with the first gaseous reactant, wherein the first gaseous reactant contains the target metal; injecting a second gaseous reactant into the reaction cavity to make the second gaseous reactant chemically react with the first gaseous reactant coated on the metal oxide nanorod, thereby obtaining the metal oxide corresponding to the target metal, wherein the first gaseous reactant and the second gaseous reactant are alternately injected into the reaction cavity, and the second gaseous reactant comprises water vapor.

2. The production method according to claim 1, characterized by, The method for doping a target metal into the metal oxide nanorod during growth comprises the following steps: controlling the increased electron beam evaporation mechanism to evaporate the target metal to the region where the metal oxide nanorod array is grown when the metal oxide nanorod array is grown in the electron beam evaporation vacuum coating machine.

3. The production method according to claim 2, characterized by, The evaporation rate of the increased electron beam evaporation mechanism is less than the evaporation rate of the electron beam evaporation mechanism in the electron beam evaporation vacuum coating machine.

4. The production method according to any one of claims 1 to 3, characterized by, The metal oxide nanorod is a ZnO2 nanorod or an In2O3 nanorod, and the target metal is one or more of Pd, Ag, Au, Ti and Sn.

5. A gas sampling unit, characterized by The gas sampling unit comprises a gas sensor array, and each gas sensor in the gas sensor array is prepared by the preparation method of the gas sensor in any one of claims 1-4.

6. An intelligent monitoring system characterized in that, The intelligent monitoring system comprises the gas sampling unit in claim 5. The gas sampling unit is arranged in an upper region inside a device to be detected, and is used for sampling different gases in the upper region of the device to be detected.

7. The monitoring system of claim 6, wherein, The monitoring system further comprises a temperature sensor, a circulating temperature control unit arranged outside the equipment to be detected, and a control unit, the temperature sensor and the circulating temperature control unit being connected to the control unit; the control unit is configured to receive the current temperature collected by the temperature sensor, and control the circulating temperature control unit to adjust the temperature of the equipment to be detected according to the current temperature.

8. The monitoring system of claim 7, wherein, The monitoring system comprises at least three temperature sensors, the three temperature sensors being arranged in the upper region, the middle region and the lower region inside the equipment to be detected respectively, and the control unit is configured to control the circulating temperature control unit arranged in the corresponding region according to the current temperature collected by the three temperature sensors respectively.

9. The monitoring system of claim 6, wherein, The monitoring system further comprises a humidity sensor and a humidity adjusting unit, the humidity sensor and the humidity adjusting unit being connected to the control unit; The control unit is configured to control the humidity adjusting unit to adjust the humidity of the upper region of the equipment to be detected according to the current humidity collected by the humidity sensor.

10. The monitoring system of claim 9, wherein, The monitoring system further comprises a liquid sampling unit, the liquid sampling unit being connected to the control unit; The control unit is configured to perform quantitative analysis according to the liquid collected by the liquid sampling unit.

11. The monitoring system of claim 9, wherein, The equipment to be detected is a wine cellar.

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