A system and method for detecting sensing properties of two-dimensional zinc oxide nanostructures

Abstract

This application provides a sensing characteristic detection system and method for two-dimensional zinc oxide nanostructures. The system uses a mass flow controller to switch the gas in a sealed chamber to an oxidizing gas of a specified concentration. After the oxidizing gas is fully adsorbed, the oxidizing sensing signal generated by the two-dimensional zinc oxide sensor is measured to determine the oxidizing piezoelectric amplitude of the oxidizing gas. The gas in the sealed chamber is then switched to a reducing gas of a specified concentration, and the reducing piezoelectric amplitude of the reducing gas is determined. Based on the oxidizing and reducing piezoelectric amplitudes, a distinction standard for different gas types is established. The response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases is calculated using the distinction standard and the baseline amplitude of the piezoelectric output signal generated by the two-dimensional zinc oxide sensor, thus completing the evaluation of the sensing characteristics of the two-dimensional zinc oxide nanostructure to different gases. Based on the above scheme, the response evaluation of the sensing characteristics of two-dimensional zinc oxide nanostructures to different gases can be achieved.

Description

Technical Field

[0001] This application relates to the field of sensing characteristic detection technology, and more specifically, to a sensing characteristic detection system and method for a two-dimensional zinc oxide nanostructure. Background Technology

[0002] Two-dimensional zinc oxide nanostructures are layered semiconductor materials with thicknesses ranging from atomic to several nanometers and lateral dimensions reaching the micrometer scale. They inherit the wide bandgap, piezoelectric, and photoelectric properties of zinc oxide, while exhibiting superior optical, electrical, catalytic, and sensing performance compared to bulk materials due to quantum confinement effects and a large specific surface area.

[0003] In traditional two-dimensional zinc oxide (ZO) resistive gas sensing, DC or low-frequency AC resistance measurement is relied upon. The contact resistance formed at the interface between the metal electrode and the ZO semiconductor is connected in series with the bulk resistance of the material itself. This instability is directly superimposed on the sensing signal, introducing significant errors. Baseline resistance drift due to environmental fluctuations or material aging is unavoidable during long-term operation. Slow baseline changes severely interfere with the accurate extraction and quantification of instantaneous resistance changes caused by gas adsorption, leading to inaccurate sensor response calculations. This significantly reduces the reliability and repeatability of sensitivity assessment, ultimately rendering performance comparisons between different batches of devices meaningless, and resulting in poor reliability of long-term stability monitoring data for the same device. Therefore, how to achieve response assessment of two-dimensional ZO nanostructures to different gas sensing characteristics, thereby improving the qualitative accuracy and quantitative assessment efficiency of gas sensing detection in ZO nanostructures, has become a challenging problem for the industry. Summary of the Invention

[0004] This application provides a sensing characteristic detection system and method for two-dimensional zinc oxide nanostructures, which can realize the response evaluation of two-dimensional zinc oxide nanostructures to different gas sensing characteristics, thereby improving the qualitative accuracy and quantitative evaluation efficiency of gas sensing detection in two-dimensional zinc oxide nanostructures.

[0005] In a first aspect, this application provides a method for detecting the sensing properties of a two-dimensional zinc oxide nanostructure, comprising:

[0006] The two-dimensional zinc oxide sensor is fixed on the test stage and placed in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline. At the same time, a piezoelectric ceramic actuator applies standardized mechanical stress, and the baseline amplitude of the piezoelectric output signal generated by the sensor is measured.

[0007] The gas in the sealed chamber is switched to an oxidizing gas of a specified concentration by a mass flow controller. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidizing sensing signal generated by the sensor is measured. The adsorption of oxidizing gas will extract electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude.

[0008] The gas in the sealed chamber is switched to a reducing gas of a specified concentration. While maintaining the same mechanical excitation conditions, the reducing sensing signal generated by the sensor is measured. The adsorption of the reducing gas contributes electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude.

[0009] Based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, a distinction standard for different gas types is established. The response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases is calculated by the distinction standard and the baseline amplitude, thus completing the evaluation of the two-dimensional zinc oxide nanostructure to the sensing characteristics of different gases.

[0010] In some embodiments, introducing an inert gas to establish a clean environmental baseline specifically includes:

[0011] Connect the sealed chamber to a gas path system consisting of a mass flow controller and a vacuum pump;

[0012] Start the vacuum pump to evacuate the sealed chamber and effectively remove impurity gases from the chamber;

[0013] Turn off the vacuum pump and introduce high-purity nitrogen into the sealed chamber through the mass flow controller until the pressure inside the chamber returns to atmospheric pressure and maintains a stable flow, thus obtaining a pure environmental baseline.

[0014] In some embodiments, the baseline amplitude of the piezoelectric output signal generated by the measuring sensor specifically includes:

[0015] A sinusoidal electrical signal is applied to the sensor device, thereby generating standardized periodic mechanical stress;

[0016] The open-circuit voltage signal generated by the sensor device is measured under periodic mechanical stress;

[0017] The baseline amplitude of the piezoelectric output signal generated by the sensor is calculated using the open-circuit voltage signal.

[0018] In some embodiments, the adsorption of oxidizing gas draws electrons from two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude. Specifically, this includes:

[0019] After the oxidizing gas adsorbs and extracts electrons from two-dimensional zinc oxide, the amount of reduction in the concentration of free electrons in the conduction band of two-dimensional zinc oxide is determined according to the adsorption chemical expression of the oxidizing gas.

[0020] The amount of reduction in concentration is used to determine the amount of reduction in the shielding effect of free electrons against piezoelectric polarization charge;

[0021] The oxidative piezoelectric amplitude after the signal amplitude increases in the oxidative sensing signal is determined based on the amount of shielding effect attenuation.

[0022] In some embodiments, the adsorption of reducing gas contributes electrons to two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude. Specifically, this includes:

[0023] After reducing gas molecules are adsorbed onto the surface of two-dimensional zinc oxide, the increase in the concentration of free electrons in the conduction band of two-dimensional zinc oxide is determined according to the adsorption chemical expression of the reducing gas.

[0024] The increase in the concentration was used to determine the increase in the shielding effect of the free electrons against the piezoelectric polarization charge.

[0025] The reduced piezoelectric amplitude of the reduced sensing signal is determined based on the increase in the shielding effect.

[0026] In some embodiments, establishing a distinction criterion for different gas types based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude specifically includes:

[0027] The oxidizing and reducing piezoelectric amplitudes of different gases were tested.

[0028] A mapping relationship between each piezoelectric amplitude and gas type is established by using each oxidizing and reducing piezoelectric amplitude;

[0029] The criteria for distinguishing different gas types are determined based on all the mapping relationships.

[0030] In some embodiments, calculating the response value of the two-dimensional zinc oxide nanostructure to different gas discrimination sensitivities using the discrimination criterion and the baseline amplitude specifically includes:

[0031] For each target gas in different gases, the target gas is qualitatively identified based on the distinguishing criteria to obtain the qualitative result of the target gas;

[0032] The response relationship of the target gas is initialized using the qualitative results;

[0033] Based on the aforementioned response relationship, the response value of the two-dimensional zinc oxide nanostructure to the target gas discrimination sensitivity is calculated, thereby obtaining the response value of the two-dimensional zinc oxide nanostructure to different gases discrimination sensitivity.

[0034] Secondly, this application provides a sensing property detection system for two-dimensional zinc oxide nanostructures, including a sensing property evaluation unit, wherein the sensing property evaluation unit includes:

[0035] The measurement module is used to fix the two-dimensional zinc oxide sensor on the test bench and place it in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline, while a piezoelectric ceramic actuator applies standardized mechanical stress to measure the baseline amplitude of the piezoelectric output signal generated by the sensor.

[0036] The processing module is used to switch the gas in the sealed chamber to an oxidizing gas of a specified concentration through a mass flow controller. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidizing sensing signal generated by the sensor is measured. The adsorption of oxidizing gas will extract electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude.

[0037] The processing module is also used to switch the gas in the sealed chamber to a reducing gas of a specified concentration, maintain the same mechanical excitation conditions, and measure the reducing sensing signal generated by the sensor. The adsorption of the reducing gas will contribute electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude.

[0038] The execution module is used to establish a distinction standard for different gas types based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, calculate the response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases through the distinction standard and the baseline amplitude, and complete the evaluation of the two-dimensional zinc oxide nanostructure to the sensing characteristics of different gases.

[0039] Thirdly, this application provides a computer device, the computer device including a memory and a processor, the memory for storing a computer program, and the processor for calling and running the computer program from the memory, so that the computer device performs the above-described method for detecting the sensing characteristics of two-dimensional zinc oxide nanostructures.

[0040] Fourthly, this application provides a computer-readable storage medium storing instructions or code that, when executed on a computer, cause the computer to implement the above-described method for detecting the sensing characteristics of two-dimensional zinc oxide nanostructures.

[0041] The technical solutions provided by the embodiments disclosed in this application have the following beneficial effects:

[0042] This application provides a sensing characteristic detection system and method for a two-dimensional zinc oxide nanostructure. The two-dimensional zinc oxide sensor is fixed on a test stage and placed in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline. Simultaneously, a piezoelectric ceramic actuator applies standardized mechanical stress, and the baseline amplitude of the piezoelectric output signal generated by the sensor is measured. A mass flow controller switches the gas in the sealed chamber to an oxidizing gas of a specified concentration. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidation sensing signal generated by the sensor is measured. The adsorption of the oxidizing gas draws electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and reducing the oxidation... The signal amplitude in the sensing signal is increased to the oxidizing piezoelectric amplitude; the gas in the sealed chamber is switched to a reducing gas of a specified concentration, while maintaining the same mechanical excitation conditions, and the reducing sensing signal generated by the sensor is measured. The adsorption of the reducing gas contributes electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude; a distinction standard for different gas types is established based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, and the response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases is calculated through the distinction standard and the baseline amplitude, thus completing the evaluation of the sensing characteristics of the two-dimensional zinc oxide nanostructure to different gases.

[0043] Therefore, in this application, a distinction standard for different gas types is established based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude. The response value of the two-dimensional zinc oxide nanostructure to the sensitivity of different gases is calculated using the distinction standard and the baseline amplitude, thus completing the evaluation of the sensing characteristics of the two-dimensional zinc oxide nanostructure to different gases. First, determining the oxidizing piezoelectric amplitude provides a positive vectorized benchmark for the oxidizing gas response, thus providing a key basis for qualitative judgment and establishing a scale for quantitative evaluation. By comparing the test results of an unknown gas with the baseline amplitude, if its signal amplitude shows a positive offset characteristic consistent with the oxidizing piezoelectric amplitude, the gas can be qualitatively identified as an oxidizing gas, greatly eliminating the risk of subjective misjudgment and improving the accuracy of qualitative analysis. The oxidizing piezoelectric amplitude, as a benchmark, is the direct input for calculating the sensor's response value to oxidizing gases. The calculation of the response value transforms the sensitivity evaluation from an abstract concept into a concrete value, enabling precise quantitative comparison of the performance between different oxidizing gases and different sensors, significantly improving the efficiency and scientific rigor of quantitative evaluation. Then… Determining the reducing piezoelectric amplitude provides a negative vectorization benchmark for the reducing gas response, thereby improving the completeness of qualitative discrimination and achieving a unified quantitative assessment of all gas types. Determining the reducing piezoelectric amplitude establishes a quantitative benchmark for the negative change in signal amplitude caused by reducing gases, making the distinction standard for gas types based on the direction of signal change complete and reliable. This ensures that the detection method can identify not only oxidizing gases but also reducing gases accurately, thus covering all target gas types in qualitative discrimination and forming a complete logical closed loop. The reducing piezoelectric amplitude also allows for precise quantification of the sensitivity of two-dimensional zinc oxide to reducing gases. Finally, together with the evaluation results for oxidizing gases, this forms a complete and unified sensitivity performance spectrum, achieving a comprehensive and efficient quantitative assessment of the material's sensing characteristics in different gas environments, avoiding the one-sidedness of the evaluation range. In summary, based on the above scheme, the response evaluation of two-dimensional zinc oxide nanostructures to different gas sensing characteristics can be realized, thereby improving the qualitative accuracy and quantitative evaluation efficiency of gas sensing detection in two-dimensional zinc oxide nanostructures. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is an exemplary flowchart of a method for detecting the sensing properties of two-dimensional zinc oxide nanostructures according to some embodiments of this application;

[0046] Figure 2 This is a flowchart illustrating the process of determining the distinguishing criteria according to some embodiments of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a sensing characteristic evaluation unit according to some embodiments of this application;

[0048] Figure 4 This is a schematic diagram of the structure of a computer device for detecting the sensing characteristics of two-dimensional zinc oxide nanostructures according to some embodiments of this application. Detailed Implementation

[0049] To better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] refer to Figure 1 The figure is an exemplary flowchart of a method for detecting the sensing properties of a two-dimensional zinc oxide nanostructure according to some embodiments of this application. The method for detecting the sensing properties of the two-dimensional zinc oxide nanostructure mainly includes the following steps:

[0051] In step 101, the two-dimensional zinc oxide sensor is fixed on the test stage and placed in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline. At the same time, a piezoelectric ceramic actuator applies standardized mechanical stress, and the baseline amplitude of the piezoelectric output signal generated by the sensor is measured.

[0052] In some embodiments, establishing a clean environmental baseline by introducing an inert gas can be achieved through the following steps:

[0053] Connect the sealed chamber to a gas path system consisting of a mass flow controller and a vacuum pump;

[0054] Start the vacuum pump to evacuate the sealed chamber and effectively remove impurity gases from the chamber;

[0055] Turn off the vacuum pump and introduce high-purity nitrogen into the sealed chamber through the mass flow controller until the pressure inside the chamber returns to atmospheric pressure and maintains a stable flow, thus obtaining a pure environmental baseline.

[0056] It should be noted that, in this application, the clean environment baseline refers to the stable reference state reached by the piezoelectric output signal of the two-dimensional zinc oxide sensor device under standardized mechanical stress in an inert environment filled only with high-purity nitrogen; impurity gas refers to all undesirable components of gas present in the sealed chamber; and the gas path system is the collection of all components connected to control and replace the gas environment in the sealed chamber.

[0057] In practice, firstly, pressure-resistant pipes and high-sealing joints are used to connect the inlet and outlet of the sealed chamber to a closed-loop gas system consisting of a mass flow controller and a vacuum pump, ensuring no leaks at any connection. The mass flow controller is connected upstream to a high-purity nitrogen source for precise control of the inlet flow rate and time, while the vacuum pump is connected to the outlet path for evacuating the sealed chamber. Then, after completing the gas system connection and confirming its sealing, the valve connected to the vacuum pump is opened while the inlet valve remains closed, and the vacuum pump is started to continuously evacuate the sealed chamber. The pressure inside the chamber is monitored by the vacuum gauge. When the pressure drops below 10 Pascals, it can be considered that most of the impurity gas in the sealed chamber has been effectively removed. Finally, after the vacuum process is completed, the inlet valve connected to the high-purity nitrogen gas source and mass flow controller is opened. By setting the mass flow controller, high-purity nitrogen gas is introduced into the sealed chamber at a constant flow rate. During this process, the pressure inside the chamber is monitored in real time until the pressure returns to normal pressure. The high-purity nitrogen gas is then kept flowing stably for at least ten minutes to ensure that the gas environment inside the sealed chamber is completely uniform and stable, and finally a pure and stable test environment is obtained as a pure environment baseline.

[0058] In some embodiments, the baseline amplitude of the piezoelectric output signal generated by the measuring sensor can be achieved by the following steps:

[0059] A sinusoidal electrical signal is applied to the sensor device, thereby generating standardized periodic mechanical stress;

[0060] The open-circuit voltage signal generated by the sensor device is measured under periodic mechanical stress;

[0061] The baseline amplitude of the piezoelectric output signal generated by the sensor is calculated using the open-circuit voltage signal.

[0062] It should be noted that, in this application, the baseline amplitude is a quantitative value used to evaluate the changes in different gas sensing signals; periodic mechanical stress refers to an alternating mechanical stimulus whose amplitude, frequency, and waveform are all controlled and can be repeatedly realized in the experiment; and the open-circuit voltage signal refers to the signal that the potential difference generated on the electrodes at both ends of the two-dimensional zinc oxide sensor due to the piezoelectric effect changes over time under the condition that no closed current loop is formed.

[0063] In specific implementation, firstly, a sinusoidal electrical signal with a frequency of 1 Hz and a peak-to-peak voltage of 10 volts is generated using a function generator, and this sinusoidal electrical signal is output to a power amplifier for amplification. The amplified electrical signal is then applied to a piezoelectric ceramic actuator adhered to one end of the substrate of the two-dimensional zinc oxide sensor. The piezoelectric ceramic actuator generates periodic deformation according to the applied electrical signal, thereby applying a standardized periodic mechanical stress with a corresponding frequency and deformation amplitude to the two-dimensional zinc oxide sensor. Then, while the two-dimensional zinc oxide sensor is subjected to the standardized periodic mechanical stress, the electrodes at both ends of the device are connected to the positive and negative input terminals of a high-impedance voltage amplifier, respectively. The input impedance of the high-impedance voltage amplifier is set to be higher than 1 terahertz. This high-impedance voltage amplifier is used to acquire and amplify the weak potential difference generated by the two-dimensional zinc oxide sensor in real time, thereby obtaining an open-circuit voltage signal with the same frequency as the mechanical stress that can be read and recorded by subsequent instruments. Finally, the open-circuit voltage signal output by the high-impedance voltage amplifier is connected to a digital storage oscilloscope to stably trigger and capture stable voltage waveforms for multiple consecutive cycles. The automatic measurement function of the oscilloscope is used to calculate the maximum voltage value (positive peak) and minimum voltage value (negative valley) of the stable voltage waveform in each cycle, and the average of the differences between each positive peak and negative valley is calculated as the baseline amplitude of the piezoelectric output signal generated by the sensor.

[0064] In step 102, the gas in the sealed chamber is switched to an oxidizing gas of a specified concentration by a mass flow controller. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidizing sensing signal generated by the sensor is measured. The adsorption of oxidizing gas will extract electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude.

[0065] It should be noted that, in this application, the oxidizing gas is a standard gas mixture formed by mixing high-purity oxidizing gas and high-purity inert carrier gas in a certain proportion; full adsorption is the state in which the oxidizing gas molecules and the surface of the two-dimensional zinc oxide nanostructure reach an adsorption-desorption dynamic equilibrium; the oxidizing sensing signal is the piezoelectric output signal generated by the sensor under standardized periodic mechanical stress excitation under the condition that the oxidizing gas is fully adsorbed on the surface of the two-dimensional zinc oxide nanostructure.

[0066] In practice, firstly, the operating parameters of the mass flow controller are set via a computer control program, switching the gas source to the sealed chamber from pure inert gas to a pre-configured standard cylinder of oxidizing gas with a specified concentration. The mass flow controller uses the set value to control the flow ratio of the oxidizing gas to the dilution inert carrier gas, and introduces the uniformly mixed oxidizing gas of the specified concentration into the sealed chamber at a constant total flow rate, while maintaining unobstructed access to the chamber outlet, thus completing the switching of the gas environment within the sealed chamber. Then, after the gas switching is completed, the specified concentration of oxidizing gas continues to be introduced into the sealed chamber at a stable flow rate, and timing begins, monitoring the piezoelectric response signal of the sensor in real time. When the piezoelectric response signal is detected... When the rate of change of the signal is lower than a preset threshold (e.g., the change in signal amplitude is less than 2% within one minute), it is determined that the oxidizing gas has reached a sufficient adsorption state on the surface of the two-dimensional zinc oxide nanostructure. Finally, after confirming that the sufficient adsorption state has been reached, it is ensured that the driving parameters (including waveform, frequency, and voltage amplitude) of the function generator and power amplifier for the piezoelectric ceramic actuator are completely consistent with those when the pure environment baseline was established, so as to apply the exact same mechanical excitation conditions. Under these mechanical excitation conditions, the open-circuit voltage signal waveform generated by the sensor device is measured and recorded again by a high-impedance voltage amplifier and a digital storage oscilloscope system as the oxidizing gas sensing signal generated by the sensor device.

[0067] In some embodiments, the adsorption of oxidizing gas draws electrons from two-dimensional zinc oxide, thereby weakening the shielding effect. The increase in the signal amplitude of the oxidizing sensing signal to the oxidizing piezoelectric amplitude can be achieved through the following steps:

[0068] After the oxidizing gas adsorbs and extracts electrons from two-dimensional zinc oxide, the amount of reduction in the concentration of free electrons in the conduction band of two-dimensional zinc oxide is determined according to the adsorption chemical expression of the oxidizing gas.

[0069] The amount of reduction in concentration is used to determine the amount of reduction in the shielding effect of free electrons against piezoelectric polarization charge;

[0070] The oxidative piezoelectric amplitude after the signal amplitude increases in the oxidative sensing signal is determined based on the amount of shielding effect attenuation.

[0071] It should be noted that, in this application, the oxidizing piezoelectric amplitude is the signal amplitude of the piezoelectric potential that is partially shielded under the weakened shielding effect, so that it can be more fully expressed as the external open-circuit voltage; the concentration reduction is the quantitative reduction in the number of free electrons in the conduction band of the two-dimensional zinc oxide material per unit volume; the weakening of the shielding effect indicates the degree of reduction in the ability of free electrons to offset or neutralize the polarization charge electric field generated inside the piezoelectric material through electrostatic interaction due to the reduction in the concentration of free electrons.

[0072] In practice, firstly, after the oxidizing gas adsorbs and extracts electrons from the two-dimensional zinc oxide, the adsorption chemical expression of the oxidizing gas (taking nitrogen dioxide as an example) is obtained. This adsorption chemical expression is that the nitrogen dioxide molecule captures a free electron in the conduction band of the two-dimensional zinc oxide to form an adsorbed nitrite ion. Based on this adsorption chemical expression, the molar flow rate of the oxidizing gas introduced per unit time and the number of maximum adsorption sites are calculated according to the specific surface area of ​​the two-dimensional zinc oxide nanostructure. This number of maximum adsorption sites is then used as the reduction in the concentration of free electrons in the conduction band of the two-dimensional zinc oxide. Then, according to the evaluation model of carrier shielding effect in semiconductor physics, this reduction in the concentration of free electrons is substituted into the Debye shielding length calculation formula in the evaluation model. The decrease in free electron concentration leads to an increase in the Debye shielding length, meaning that the free electron cloud can no longer effectively shield the electric field generated by the piezoelectric polarization charge as before. Therefore, the calculation result of the Debye shielding length calculation formula is used as the amount of reduction in the shielding effect of free electrons on the piezoelectric polarization charge. Finally, a linear relationship is obtained from the standard library of two-dimensional zinc oxide nanostructures, in which the open-circuit voltage (i.e., the amplitude of the piezoelectric output signal) generated by the piezoelectric material is proportional to the amount of effective polarization charge that is not shielded (i.e., the amount of reduction in the shielding effect). According to this linear relationship, the amount of reduction in the shielding effect is converted into a theoretical increase in the amplitude of the piezoelectric output signal. The result of adding the theoretical increase to the baseline piezoelectric amplitude is used as the oxidizing piezoelectric amplitude after the signal amplitude increases after the adsorption of oxidizing gas.

[0073] In step 103, the gas in the sealed chamber is switched to a reducing gas of a specified concentration. While maintaining the same mechanical excitation conditions, the reducing sensing signal generated by the sensor is measured. The adsorption of the reducing gas contributes electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude.

[0074] It should be noted that, in this application, the reducing gas is a standard gas mixture formed by mixing high-purity reducing gas and high-purity inert carrier gas in a precise ratio; the mechanical excitation conditions are all parameters of the mechanical stress applied when measuring the reducing sensing signal; the reducing sensing signal is the piezoelectric output signal generated by the sensor under the same mechanical excitation conditions, provided that the reducing gas is fully adsorbed on the surface of the two-dimensional zinc oxide nanostructure.

[0075] In practice, firstly, the operating parameters of the mass flow controller are set by a computer control program to switch the gas source to the sealed chamber from an oxidizing gas or pure inert gas to a pre-configured standard gas cylinder of a specified concentration of reducing gas. The mass flow controller controls the flow ratio of reducing gas to dilution inert carrier gas according to the set value, and introduces the uniformly mixed reducing gas of the specified concentration into the sealed chamber at a constant total flow rate, while maintaining unobstructed access to the chamber outlet, thus completing the switch of the gas environment in the sealed chamber to a reducing atmosphere. Then, after the gas switching is completed, no settings of the function generator and power amplifier are changed to ensure that the waveform of the drive signal output to the piezoelectric ceramic actuator remains sinusoidal, the frequency remains at one hertz, and the peak-to-peak voltage remains at ten volts, thereby ensuring that the periodic mechanical stress applied to the two-dimensional zinc oxide sensor is exactly the same as the stress conditions in the previous measurement steps. Finally, while maintaining the same mechanical excitation conditions, the open-circuit voltage signal waveform generated across the two-dimensional zinc oxide sensor is measured and recorded as the reducing sensing signal using a high-impedance voltage amplifier and a digital storage oscilloscope system.

[0076] In some embodiments, the adsorption of reducing gas contributes electrons to two-dimensional zinc oxide, thereby enhancing the shielding effect. The reduction of the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude can be achieved through the following steps:

[0077] After reducing gas molecules are adsorbed onto the surface of two-dimensional zinc oxide, the increase in the concentration of free electrons in the conduction band of two-dimensional zinc oxide is determined according to the adsorption chemical expression of the reducing gas.

[0078] The increase in the concentration was used to determine the increase in the shielding effect of the free electrons against the piezoelectric polarization charge.

[0079] The reduced piezoelectric amplitude of the reduced sensing signal is determined based on the increase in the shielding effect.

[0080] It should be noted that, in this application, the reducing piezoelectric amplitude is the signal amplitude under the specific condition of enhanced shielding effect, in which the piezoelectric polarization charge is shielded by free electrons and cannot contribute to the external potential; the concentration increase is the quantitative increase in the number of free electrons in the conduction band of a unit volume of two-dimensional zinc oxide material; the shielding effect increase indicates the degree of enhancement in the ability of free electrons to counteract or neutralize the polarization charge electric field generated inside the piezoelectric material through electrostatic interaction due to the increase in free electron concentration.

[0081] In practice, firstly, after reducing gas molecules are adsorbed onto the surface of two-dimensional zinc oxide, the adsorption chemical expression of the reducing gas (taking hydrogen as an example) is obtained. This expression shows that hydrogen molecules react with pre-adsorbed oxygen ions to generate water and release free electrons to the conduction band of the two-dimensional zinc oxide. Based on this expression, the molar flow rate of the reducing gas introduced per unit time and the number of active sites estimated based on the specific surface area of ​​the two-dimensional zinc oxide nanostructure are used as the increase in the concentration of free electrons in the conduction band of the two-dimensional zinc oxide. Then, according to the evaluation model of carrier shielding effect in semiconductor physics, this increase in concentration is substituted into the Debye shielding length calculation formula in the evaluation model. The increase in free electron concentration leads to a decrease in the Debye shielding length, which means that the free electron cloud can more effectively shield the internal electric field generated by the piezoelectric polarization charge. The calculation results of the model are then evaluated as the improvement in the shielding effect of free electrons on the piezoelectric polarization charge. Finally, a linear relationship is obtained from the standard library of two-dimensional zinc oxide nanostructures, in which the open-circuit voltage (i.e., the reduced piezoelectric amplitude) generated by the piezoelectric material is proportional to the amount of effective polarization charge that is not shielded (i.e., the improvement in shielding effect). According to this linear relationship, the improvement in shielding effect is converted into a theoretical reduction in the amplitude of the piezoelectric output signal. The difference between the baseline piezoelectric amplitude and this theoretical reduction is taken as the reduced piezoelectric amplitude after the signal amplitude is reduced in the reduced sensing signal.

[0082] In step 104, a distinction standard for different gas types is established based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude. The response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases is calculated through the distinction standard and the baseline amplitude, thus completing the evaluation of the two-dimensional zinc oxide nanostructure's sensing characteristics for different gases.

[0083] In some embodiments, a distinction criterion for different gas types is established based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, with reference to... Figure 2 The diagram is a flowchart illustrating the process of determining the distinguishing criteria in some embodiments of this application. In this embodiment, the distinguishing criteria can be determined using the following steps:

[0084] In step 1041, the oxidizing piezoelectric amplitude and reducing piezoelectric amplitude of different gases are tested;

[0085] In step 1042, a mapping relationship between each piezoelectric amplitude and the gas type is established through each oxidizing piezoelectric amplitude and reducing piezoelectric amplitude;

[0086] In step 1043, the criteria for distinguishing different gas types are determined based on all the mapping relationships.

[0087] It should be noted that, in this application, the distinction criterion is a judgment criterion used to identify the gas type to which an unknown gas belongs. In specific implementation, firstly, the gas environment in the sealed chamber is sequentially switched to various specified concentrations of different oxidizing gases (e.g., nitrogen dioxide, ozone) and different reducing gases (e.g., hydrogen, carbon monoxide). For each gas, the process of introducing gas, waiting for sufficient adsorption, and measuring the sensing signal under the same mechanical excitation conditions is repeated to obtain oxidizing and reducing piezoelectric amplitudes covering different gases. Then, the correspondence between each oxidizing and reducing piezoelectric amplitude and different gases is used as the mapping relationship between the corresponding piezoelectric amplitude and gas type, thus obtaining the mapping relationship between each piezoelectric amplitude and gas type. This mapping relationship refers to the correspondence rule between each piezoelectric signal amplitude data point and the gas type. Finally, the set of all mapping relationships is used as the distinction criterion for different gas types.

[0088] In some embodiments, the response values ​​of the two-dimensional zinc oxide nanostructure to different gases, based on the discrimination criteria and the baseline amplitude, can be achieved using the following steps:

[0089] For each target gas in different gases, the target gas is qualitatively identified based on the distinguishing criteria to obtain the qualitative result of the target gas;

[0090] The response relationship of the target gas is initialized using the qualitative results;

[0091] Based on the aforementioned response relationship, the response value of the two-dimensional zinc oxide nanostructure to the target gas discrimination sensitivity is calculated, thereby obtaining the response value of the two-dimensional zinc oxide nanostructure to different gases discrimination sensitivity.

[0092] It should be noted that, in this application, the response value is a dimensionless set of numerical values ​​used to quantify the sensitivity of the two-dimensional zinc oxide nanostructure to the target gas; the qualitative result is the judgment conclusion of the basic properties of the target gas to be tested; and the response relationship is the specific mathematical relationship used to calculate the response value.

[0093] In specific implementation, firstly, for each target gas among different gases, the gas type corresponding to the piezoelectric signal amplitude data point of the target gas is obtained from the differentiation standard, and this gas type is used as the qualitative result of the target gas. If there is no piezoelectric signal amplitude data point corresponding to the target gas in the differentiation standard, then the gas type with the smallest difference between the piezoelectric signal amplitude of the target gas and that of the target gas in the differentiation standard is selected as the qualitative result of the target gas. Then, if the qualitative result indicates that the target gas is an oxidizing gas, the response relationship defined for oxidizing gases is initialized and selected, i.e., response value = (target gas piezoelectric signal amplitude - baseline amplitude) / baseline amplitude. If the qualitative result indicates that the target gas is a reducing gas, the response relationship defined for reducing gases is initialized and selected, i.e., response value = (baseline amplitude - target gas piezoelectric signal amplitude) / baseline amplitude. Finally...

[0094] Furthermore, in another aspect of this application, in some embodiments, this application provides a sensing characteristic detection system for two-dimensional zinc oxide nanostructures. This sensing characteristic detection system includes a sensing characteristic evaluation unit, referencing... Figure 3 The figure is a schematic diagram of the structure of a sensing characteristic evaluation unit according to some embodiments of this application. The sensing characteristic evaluation unit includes: a measurement module 201, a processing module 202, and an execution module 203, which are described below:

[0095] Measurement module 201, in this application, is mainly used to fix the two-dimensional zinc oxide sensor on the test bench and place it in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline, and a piezoelectric ceramic actuator applies standardized mechanical stress to measure the baseline amplitude of the piezoelectric output signal generated by the sensor.

[0096] Processing module 202, in this application, is used to switch the gas in the sealed chamber to an oxidizing gas of a specified concentration through a mass flow controller. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidizing sensing signal generated by the sensor is measured. The adsorption of oxidizing gas will extract electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude.

[0097] It should be noted that the processing module 202 is also used to switch the gas in the sealed chamber to a reducing gas of a specified concentration, maintain the same mechanical excitation conditions, and measure the reducing sensing signal generated by the sensor device. The adsorption of reducing gas will contribute electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude.

[0098] The execution module 203 in this application is mainly used to establish a distinction standard for different gas types based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, calculate the response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases through the distinction standard and the baseline amplitude, and complete the evaluation of the two-dimensional zinc oxide nanostructure to the sensing characteristics of different gases.

[0099] The foregoing has detailed examples of the sensing characteristic detection system and method for two-dimensional zinc oxide nanostructures provided in the embodiments of this application. It is understood that the corresponding apparatus, in order to achieve the above functions, includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0100] In some embodiments, this application also provides a computer device, the computer device including a memory and a processor, the memory for storing a computer program, and the processor for calling and running the computer program from the memory, so that the computer device performs the above-described method for detecting the sensing characteristics of two-dimensional zinc oxide nanostructures.

[0101] In some embodiments, reference Figure 4 The dashed lines in the figure indicate that the unit or module is optional. This figure is a schematic diagram of the structure of a computer device for detecting the sensing characteristics of a two-dimensional zinc oxide nanostructure according to an embodiment of this application. The sensing characteristic detection method for the two-dimensional zinc oxide nanostructure described in the above embodiments can be achieved through… Figure 4 The computer device shown is used to implement this, and the computer device includes at least one processor 301, a memory 302 and at least one communication unit 305. The computer device may be a terminal device, a server or a chip.

[0102] Processor 301 can be a general-purpose processor or a special-purpose processor. For example, processor 301 can be a central processing unit (CPU), which can be used to control computer devices, execute software programs, and process data from software programs. The computer device may also include a communication unit 305 for inputting (receiving) and outputting (transmitting) signals.

[0103] For example, the computer device may be a chip, and the communication unit 305 may be the input and / or output circuit of the chip, or the communication unit 305 may be the communication interface of the chip, which may be a component of a terminal device, network device or other device.

[0104] For example, the computer device may be a terminal device or a server, and the communication unit 305 may be a transceiver of the terminal device or the server, or the communication unit 305 may be a transceiver circuit of the terminal device or the server.

[0105] The computer device may include one or more memories 302 storing a program 304. The program 304 can be executed by a processor 301 to generate instructions 303, causing the processor 301 to execute the method described in the above method embodiments according to the instructions 303. Optionally, the memory 302 may also store data (such as a target audit model). Optionally, the processor 301 may also read data stored in the memory 302, which may be stored at the same storage address as the program 304, or it may be stored at a different storage address than the program 304.

[0106] The processor 301 and memory 302 can be configured separately or integrated together, for example, integrated on the system on chip (SOC) of the terminal device.

[0107] It should be understood that each step of the above method embodiment can be completed by hardware logic circuits or software instructions in the processor 301. The processor 301 can be a CPU, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, such as discrete gate, transistor logic devices, or discrete hardware components.

[0108] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0109] For example, in some embodiments, this application also provides a computer-readable storage medium storing instructions or code that, when executed on a computer, cause the computer to implement the above-described method for detecting the sensing characteristics of two-dimensional zinc oxide nanostructures.

[0110] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0111] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for detecting the sensing properties of a two-dimensional zinc oxide nanostructure, characterized in that, Includes the following steps: The two-dimensional zinc oxide sensor is fixed on the test stage and placed in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline. At the same time, a piezoelectric ceramic actuator applies standardized mechanical stress, and the baseline amplitude of the piezoelectric output signal generated by the sensor is measured. The gas in the sealed chamber is switched to an oxidizing gas of a specified concentration by a mass flow controller. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidizing sensing signal generated by the sensor is measured. The adsorption of oxidizing gas will extract electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude. The gas in the sealed chamber is switched to a reducing gas of a specified concentration. While maintaining the same mechanical excitation conditions, the reducing sensing signal generated by the sensor is measured. The adsorption of the reducing gas contributes electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude. Based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, a distinction standard for different gas types is established. The response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases is calculated by the distinction standard and the baseline amplitude, thus completing the evaluation of the two-dimensional zinc oxide nanostructure to the sensing characteristics of different gases. During oxidizing gas treatment, a mass flow controller switches the gas source in the sealed chamber to a specified concentration of oxidizing gas. This oxidizing gas is a standard gas mixture composed of high-purity oxidizing gas and inert carrier gas in a certain proportion. It is introduced at a constant total flow rate while maintaining unobstructed outlet. Gas is continuously introduced while monitoring the piezoelectric response signal. Sufficient adsorption is determined when the signal change rate is lower than a preset threshold. Mechanical excitation conditions consistent with the baseline stage are maintained, and the open-circuit voltage signal is measured and recorded as the oxidizing sensing signal. The reduction in free electron concentration is calculated based on the adsorption chemical expression, and the reduction in shielding effect is obtained by substituting it into the Debye shielding length calculation formula. The reduction in shielding effect is converted into a theoretical increase in signal amplitude by combining a linear relationship. The theoretical increase in signal amplitude is added to the baseline piezoelectric amplitude to obtain the oxidizing piezoelectric amplitude. In the process of reducing gas treatment, a computer-controlled mass flow controller switches the gas source of the sealed chamber to a reducing gas of a specified concentration. The reducing gas is a standard gas mixture of high-purity reducing gas and inert carrier gas, which is introduced at a constant total flow rate and the outlet is kept clear. The mechanical excitation conditions are kept consistent with the previous ones, and the open-circuit voltage signal is measured and recorded as the reducing gas sensing signal. The increase in free electron concentration is calculated according to the adsorption chemical expression, and the increase in shielding effect is obtained by substituting it into the Debye shielding length calculation formula. The increase in shielding effect is converted into the theoretical decrease in signal amplitude by combining the linear relationship. The theoretical decrease in signal amplitude is obtained by subtracting the baseline piezoelectric amplitude from the theoretical decrease in signal amplitude. The reducing piezoelectric amplitude is obtained by subtracting the theoretical decrease in signal amplitude from the baseline piezoelectric amplitude.

2. The method as described in claim 1, characterized in that, Establishing a clean environmental baseline by introducing inert gas specifically includes: Connect the sealed chamber to a gas path system consisting of a mass flow controller and a vacuum pump; Start the vacuum pump to evacuate the sealed chamber and effectively remove impurity gases from the chamber; Turn off the vacuum pump and introduce high-purity nitrogen into the sealed chamber through the mass flow controller until the pressure inside the chamber returns to atmospheric pressure and maintains a stable flow, thus obtaining a pure environmental baseline.

3. The method as described in claim 1, characterized in that, The baseline amplitude of the piezoelectric output signal generated by the measuring sensor specifically includes: A sinusoidal electrical signal is applied to the sensor device, thereby generating standardized periodic mechanical stress; The open-circuit voltage signal generated by the sensor device is measured under periodic mechanical stress; The baseline amplitude of the piezoelectric output signal generated by the sensor is calculated using the open-circuit voltage signal.

4. The method as described in claim 1, characterized in that, The adsorption of oxidizing gases will draw electrons from two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude, specifically including: After the oxidizing gas adsorbs and extracts electrons from two-dimensional zinc oxide, the amount of reduction in the concentration of free electrons in the conduction band of two-dimensional zinc oxide is determined according to the adsorption chemical expression of the oxidizing gas. The amount of reduction in concentration is used to determine the amount of reduction in the shielding effect of free electrons against piezoelectric polarization charge; The oxidative piezoelectric amplitude after the signal amplitude increases in the oxidative sensing signal is determined based on the amount of shielding effect attenuation.

5. The method as described in claim 1, characterized in that, The adsorption of reducing gases contributes electrons to two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude. Specifically, this includes: After reducing gas molecules are adsorbed onto the surface of two-dimensional zinc oxide, the increase in the concentration of free electrons in the conduction band of two-dimensional zinc oxide is determined according to the adsorption chemical expression of the reducing gas. The increase in the concentration was used to determine the increase in the shielding effect of the free electrons against the piezoelectric polarization charge. The reduced piezoelectric amplitude of the reduced sensing signal is determined based on the increase in the shielding effect.

6. The method as described in claim 1, characterized in that, The criteria for distinguishing different gas types based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude specifically include: The oxidizing and reducing piezoelectric amplitudes of different gases were tested. A mapping relationship between each piezoelectric amplitude and gas type is established by using each oxidizing and reducing piezoelectric amplitude; The criteria for distinguishing different gas types are determined based on all the mapping relationships.

7. The method as described in claim 1, characterized in that, The calculation of the response values ​​of the two-dimensional zinc oxide nanostructure to different gases using the discrimination criteria and the baseline amplitude specifically includes: For each target gas in different gases, the target gas is qualitatively identified based on the distinguishing criteria to obtain the qualitative result of the target gas; The response relationship of the target gas is initialized using the qualitative results; Based on the aforementioned response relationship, the response value of the two-dimensional zinc oxide nanostructure to the target gas discrimination sensitivity is calculated, thereby obtaining the response value of the two-dimensional zinc oxide nanostructure to different gases discrimination sensitivity.

8. A sensing characteristic detection system for a two-dimensional zinc oxide nanostructure, the sensing characteristic detection system comprising a sensing characteristic evaluation unit, wherein the sensing characteristic detection of the two-dimensional zinc oxide nanostructure is performed using the method described in any one of claims 1 to 7, characterized in that, The sensing characteristic evaluation unit includes: The measurement module is used to fix the two-dimensional zinc oxide sensor on the test bench and place it in a sealed chamber with a controlled atmosphere. An inert gas is introduced to establish a pure environmental baseline, while a piezoelectric ceramic actuator applies standardized mechanical stress to measure the baseline amplitude of the piezoelectric output signal generated by the sensor. The processing module is used to switch the gas in the sealed chamber to an oxidizing gas of a specified concentration through a mass flow controller. After the oxidizing gas is fully adsorbed, the same mechanical excitation conditions are maintained, and the oxidizing sensing signal generated by the sensor is measured. The adsorption of oxidizing gas will extract electrons from the two-dimensional zinc oxide, thereby weakening the shielding effect and increasing the signal amplitude in the oxidizing sensing signal to the oxidizing piezoelectric amplitude. The processing module is also used to switch the gas in the sealed chamber to a reducing gas of a specified concentration, maintain the same mechanical excitation conditions, and measure the reducing sensing signal generated by the sensor. The adsorption of the reducing gas will contribute electrons to the two-dimensional zinc oxide, thereby enhancing the shielding effect and reducing the signal amplitude in the reducing sensing signal to the reducing piezoelectric amplitude. The execution module is used to establish a distinction standard for different gas types based on the oxidizing piezoelectric amplitude and the reducing piezoelectric amplitude, calculate the response value of the two-dimensional zinc oxide nanostructure to the distinction sensitivity of different gases through the distinction standard and the baseline amplitude, and complete the evaluation of the two-dimensional zinc oxide nanostructure to the sensing characteristics of different gases.

9. A computer device, characterized in that, The computer device includes a memory and a processor. The memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that the computer device performs the sensing characteristic detection method of the two-dimensional zinc oxide nanostructure according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions or code that, when executed on a computer, cause the computer to implement the sensing characteristic detection method of the two-dimensional zinc oxide nanostructure as described in any one of claims 1 to 7.

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