Carrier gas type multi-dimensional in-situ gas-sensitive mechanism research device

Abstract

The utility model relates to the technical field of in-situ detection of gas-sensitive materials, in particular to a carrier gas type multi-dimensional in-situ gas-sensitive mechanism research device which comprises a gas extraction assembly, a first switch and a gas supply assembly, the gas extraction assembly comprises a sample tube and a vacuum pump, a first connecting port of the first switch is connected with the sample tube, and a second connecting port of the first switch is connected with the gas supply assembly. A second connecting port of the first switch is connected with the vacuum pump, the gas supply assembly comprises a gas input end, a second switch, a gas filter, a third switch, a mass flow controller, a fourth switch and a fifth switch which are connected in sequence, and the fifth switch is connected with a third connecting port of the first switch. By accurately controlling and simulating various gas environments, in-situ detection of the gas-sensitive material is realized under different gas partial pressures, so that the accuracy and the reliability of an experimental result are remarkably improved, and powerful technical support is provided for deeply researching a gas-sensitive mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of in-situ detection of gas-sensitive materials, in particular to a gas-carrying multi-dimensional in-situ gas-sensitive mechanism research device. Background Art

[0002] High-performance gas sensors are a crucial component of intelligent sensing systems and are widely used in sensor-based Internet of Things systems. They are closely related to applications such as public health, environmental protection, and national security. A gas sensor's gas-sensing materials, device structure, and detection mode not only determine its sensing performance but also directly impact key performance indicators such as power consumption, sensitivity, and stability. Therefore, developing gas sensors with low detection limits, high selectivity, and low power consumption requires research on gas-sensing materials, optimization of device structure, and design of detection modes. The development of gas-sensing materials is crucial, as is in-depth research on gas-sensing mechanisms.

[0003] At present, the research on the gas-sensing mechanism of gas-sensitive materials mainly stays at the stage of qualitative description, lacking quantitative mechanism research at the atomic level. As a result, no mechanism and theory with guiding significance for material design has been formed, resulting in the current research and development of gas-sensitive materials still being mainly based on a lot of trial and error, and there is still a large gap from the "demand-oriented-precise controllable" requirements of the new generation of smart materials. The research on related gas-sensing mechanisms is mainly limited by the high disorder of gas molecules and the high discreteness in the material. Conventional characterization methods are difficult to accurately capture the steady-state and transient processes of the interaction between gas and materials, resulting in the difficulty of understanding the gas-sensing mechanism at the atomic level. Therefore, how to establish a reliable, high-precision, multi-dimensional gas-sensing mechanism research method, systematically reveal the structural evolution process of functional groups and adsorption sites in gas-sensitive materials under static, dynamic and in-situ conditions, and provide a theoretical basis for the subsequent precise design of demand-oriented gas-sensitive materials, is a key scientific issue in the field of intelligent gas sensors.

[0004] Currently, in-situ techniques such as in-situ Raman spectroscopy, in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFT), and in-situ infrared emission spectroscopy (IRES) have facilitated research on gas-sensing mechanisms to a certain extent, but they still have limitations. While they can enable qualitative and quantitative analysis of surface groups in gas-sensitive materials, they are still insufficient in precisely controlling the reaction gas pressure and studying the in-situ structural evolution of adsorption sites. Furthermore, in-situ experiments based on synchrotron radiation technology, while capable of testing at room temperature and pressure, cannot yet cover the complex conditions of varying partial pressures and carrier gas concentrations. Utility Model Content

[0005] To this end, the technical problem to be solved by the present invention is to overcome the lack of in-depth research on the dynamic evolution of surface groups and crystal structures of gas-sensitive materials under different gas partial pressures and the understanding of gas-sensitive mechanisms at the atomic level in the existing technology, and at the same time, it is difficult to accurately capture the steady-state and transient processes of the interaction between gas and materials.

[0006] In order to solve the above technical problems, the utility model provides a gas-carrying multi-dimensional in-situ gas-sensing mechanism research device, comprising:

[0007] A vacuum pump assembly, comprising a sample tube and a vacuum pump;

[0008] a first switch, wherein a first connection port of the first switch is connected to the sample tube, and a second connection port of the first switch is connected to the vacuum pump;

[0009] A gas supply component includes a gas input end, a second switch, a gas filter, a third switch, a mass flow controller, a fourth switch and a fifth switch connected in sequence, wherein the fifth switch is connected to the third connection port of the first switch.

[0010] In one embodiment of the present invention, the gas extraction component further includes a first pressure measuring gauge, which is disposed on a connection passage between the sample tube and the first connection port.

[0011] In one embodiment of the present invention, the gas supply assembly further includes a second pressure measuring gauge, and the second pressure measuring gauge is provided on the connection path between the gas input end and the second switch.

[0012] In one embodiment of the present invention, the gas supply component further includes a third pressure measuring gauge, and the third pressure measuring gauge is provided on the connection path between the second switch and the gas filter.

[0013] In one embodiment of the present invention, the first switch is a three-way ball valve.

[0014] In one embodiment of the present invention, the second switch is a pressure reducing valve.

[0015] In one embodiment of the present invention, the third switch is a needle valve.

[0016] In one embodiment of the present invention, the fourth switch is a needle valve.

[0017] In one embodiment of the present invention, the fifth switch is a one-way valve, an input end of the fifth switch is connected to the fourth switch, and an output end of the fifth switch is connected to the third connection port of the first switch.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] 1. Versatility and adaptability: This utility model is not only limited to the characterization of synchrotron radiation in-situ scattering and diffraction, but is also compatible with solid-state nuclear magnetic in-situ detection. This versatility greatly broadens its application areas and research methods, and meets the experimental requirements under different scientific research needs.

[0020] 2. Low-vacuum in-situ activation capability: The unique design of the device allows for in-situ activation of gas-sensitive materials under low-vacuum conditions. This feature is crucial for a deep understanding of the performance changes of gas-sensitive materials under conditions close to their actual working environments, and provides a testing platform closer to actual conditions for optimizing the performance of gas-sensitive materials.

[0021] 3. Precise control of test gas: Through the integrated gas supply components, including pressure reducing valves, mass flow controllers and precision switches, this device can achieve precise control of test gas, including gas type, flow rate, partial pressure and other parameters, ensuring the accuracy and repeatability of experimental results.

[0022] 4. In-situ characterization testing under different gas pressures: The device can cover a variety of test conditions from low vacuum to atmospheric pressure and even higher pressures, realizing in-situ characterization testing of gas-sensitive materials under different gas pressures. This capability plays an irreplaceable role in fully revealing the gas-sensing mechanism and evaluating material performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on the specific embodiments of the utility model and in conjunction with the accompanying drawings, wherein

[0024] Figure 1 This is a schematic structural diagram of a gas-carrying multi-dimensional in-situ gas-sensing mechanism research device provided in an embodiment of the present utility model;

[0025] Description of the accompanying drawings:

[0026] 1. Vacuum assembly; 11. Sample tube; 12. Vacuum pump; 13. First pressure gauge; 2. First switch; 3. Gas supply assembly; 31. Gas input terminal; 32. Second switch; 33. Gas filter; 34. Third switch; 35. Mass flow controller; 36. Fourth switch; 37. Fifth switch; 38. Second pressure gauge; 39. Third pressure gauge. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0028] Reference Figure 1 As shown, the utility model provides a carrier gas multi-dimensional in-situ gas-sensing mechanism research device that integrates multifunctionality, adaptability, low vacuum in-situ activation capability and precise control of test gas, including:

[0029] The vacuum assembly 1 includes a sample tube 11 and a vacuum pump 12.

[0030] a first switch 2 , wherein a first connection port of the first switch 2 is connected to the sample tube 11 , and a second connection port of the first switch 2 is connected to the vacuum pump 12 ;

[0031] The gas supply component 3 includes a gas input end 31, a second switch 32, a gas filter 33, a third switch 34, a mass flow controller 35, a fourth switch 36 and a fifth switch 37 connected in sequence, and the fifth switch 37 is connected to the third connection port of the first switch 2.

[0032] In this embodiment, the vacuum assembly 1 further includes a first pressure gauge 13 with an accuracy of up to 0.1 Pa, disposed in the path connecting the sample tube 11 and the first connection port. The sample tube 11 and vacuum pump 12 work in conjunction with each other, enabling rapid vacuuming within the sample tube through precise control of the first switch 2. The presence of the first pressure gauge 13, with an accuracy of up to 0.1 Pa, ensures precise and measurable vacuum levels, meeting stringent experimental requirements.

[0033] Furthermore, the gas supply component 3 also includes a second pressure measuring gauge 38 and a third pressure measuring gauge 39 that can be read on site. The second pressure measuring gauge 38 is arranged on the connecting path between the gas input end 31 and the second switch 32, and the third pressure measuring gauge 39 is arranged on the connecting path between the second switch 32 and the gas filter 33.

[0034] Furthermore, the first switch 2 is a three-way ball valve, the second switch 32 is a pressure reducing valve, and the third switch 34 and the fourth switch 36 are both needle valves.

[0035] Furthermore, the fifth switch 37 is a one-way valve, the input end of the fifth switch 37 is connected to the fourth switch, and the output end is connected to the third connection port of the first switch 2. The fifth switch 37 prevents gas backflow and protects the system from reverse pressure or contamination.

[0036] This device cleverly incorporates a gas replenishment assembly 3, which follows a precisely designed process: starting from the gas input 31, the pressure is precisely reduced by a pressure-reducing valve 32, and then deeply purified by a gas filter 33 to remove impurities and maintain gas purity. Subsequently, through the dual regulation of a needle valve 34 and a mass flow controller 35, extremely precise control of gas flow and partial pressure is achieved. Finally, a one-way valve 37 ensures unidirectional gas flow, preventing backflow and protecting system safety. This gas replenishment assembly 3 not only supports flexible switching between multiple test gases but also allows for free adjustment from low vacuum to high pressure, providing environmental conditions for in-situ characterization testing of gas-sensitive materials under varying pressure environments.

[0037] In addition, a second pressure gauge 38 and a third pressure gauge 39 are added to the gas supply component 3, which are respectively located before and after the gas input end 31 and the pressure reducing valve 32, to achieve full pressure monitoring and ensure the accuracy and repeatability of the experimental data.

[0038] The working principle of the gas-carrying multi-dimensional in-situ gas-sensing mechanism research device provided by the utility model is described below:

[0039] During the testing process, the first switch 2 is first set to vacuum mode, and then the vacuum pump 12 is activated to rigorously draw vacuum from the sample tube 11. During this process, the air pressure reading within the sample tube 11 is monitored and verified in real time using the first pressure gauge 13 to ensure that the predetermined vacuum level is met. Subsequently, the sample undergoes heat activation to mitigate the effects of uncontrolled variables caused by ex situ activation during the sample's secondary transfer process, which may result from contact with air.

[0040] After completing the above preparations, in-situ testing can be performed to carefully observe the changes in the sample's physical and chemical properties under vacuum or specific conditions. Next, the first switch 2 is switched to the gas supply state, and high-pressure gas A enters the pipeline system of the gas supply component 3 through the gas input port 31. To ensure the safe operation of subsequent equipment and the accuracy of the experiment, the second switch 32 is used to adjust the pressure of gas A to within the system's required safety range.

[0041] The depressurized gas A then enters the gas filter 33 to effectively remove impurities in the gas A, including but not limited to dust, particles, or moisture, ensuring that the gas entering the system reaches a high degree of purity. Next, the third switch 34 is used to perform preliminary flow control on the filtered gas A, while the precision mass flow controller 35 further accurately controls the mass flow rate of gas A. In addition, a fourth switch 36 is provided as a flow fine-tuning and backup control method, greatly improving the flexibility and accuracy of experimental operations. The precisely regulated gas A is stably delivered to the sample tube 11 through the fifth switch 37, providing a reliable gas environment for subsequent in-depth research.

[0042] The multi-dimensional, carrier-gas-based in-situ gas-sensing mechanism research device provided by this utility model can precisely introduce target detection gases and interfering gases, and precisely control key environmental parameters such as their concentration gradient, flow rate, and relative humidity to closely simulate the gas environment in actual operating scenarios. Under these conditions, the gas-sensing material sample dynamically interacts with specific gas molecules, providing a solid experimental foundation for in-depth analysis of the microscopic mechanisms of the gas-sensing effect.

[0043] This device can be used for real-time monitoring and analysis of the in-situ scattering and diffraction properties of materials under the action of gas, providing intuitive evidence for revealing the intrinsic connection between material structure and performance changes. In addition, this device is also compatible with solid-state nuclear magnetic resonance in-situ detection, and by integrating multi-dimensional characterization, it can further enhance the comprehensiveness and depth of the experiment.

[0044] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A gas-carrying multi-dimensional in-situ gas-sensing mechanism research device, characterized in that: include: A vacuum assembly (1), comprising a sample tube (11) and a vacuum pump (12), a first switch (2), wherein a first connection port of the first switch (2) is connected to the sample tube (11), and a second connection port of the first switch (2) is connected to the vacuum pump (12); A gas supply component (3), the gas supply component (3) comprising a gas input end (31), a second switch (32), a gas filter (33), a third switch (34), a mass flow controller (35), a fourth switch (36) and a fifth switch (37) connected in sequence, the fifth switch (37) being connected to the third connection port of the first switch (2).

2. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 1, characterized in that: The gas extraction component (1) further comprises a first pressure measuring gauge (13), and the first pressure measuring gauge (13) is arranged on a connection passage between the sample tube (11) and the first connection port.

3. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 2, characterized in that: The gas supply component (3) further includes a second pressure measuring gauge (38), which is arranged on the connection path between the gas input end (31) and the second switch (32).

4. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 3, characterized in that: The gas supply component (3) further comprises a third pressure measuring gauge (39), and the third pressure measuring gauge (39) is arranged on the connection path between the second switch (32) and the gas filter (33).

5. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 1, characterized in that: The first switch (2) is a three-way ball valve.

6. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 1, characterized in that: The second switch (32) is a pressure reducing valve.

7. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 1, characterized in that: The third switch (34) is a needle valve.

8. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 1, characterized in that: The fourth switch (36) is a needle valve.

9. The gas-carrying multi-dimensional in-situ gas-sensing mechanism research device according to claim 1, characterized in that: The fifth switch (37) is a one-way valve, the input end of the fifth switch (37) is connected to the fourth switch (36), and the output end is connected to the third connection port of the first switch (2).

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