Aromatic molecule-imprinted sensor array, detection device, electronic nose and application

Abstract

The embodiment of the specification provides an aromatic molecule imprinting electrochemical sensor array, an aromatic molecule detection device, an electronic nose system and application thereof in detection of dangerous solid waste aromatic molecules. A composite film gas sensor array modified by a molecular imprinting polymer and a semiconductor material is used as a detection device, and imprinting cavities capable of selectively adsorbing aromatic molecules exist in the surface film of the device. When different target molecules reach the surface of the molecular imprinting material, the response values of the sensors composed of different materials to the target gas are different, so that the conductive properties of the semiconductor material are changed, and the resistance of the sensor is changed differently. Compared with the current aromatic molecule detection method which is complex to prepare and needs high-temperature conditions, the gas sensor array prepared by the application is small in size, low in manufacturing cost, simple and efficient in detection method and wide in detection range, is a new high-selectivity detection method and has a wide application prospect.

Description

Technical Field

[0001] This application relates to the field of gas detection technology, and in particular to an aromatic molecule imprinted electrochemical sensor array, an aromatic molecule detection device, an electronic nose system, and their application in detecting aromatic molecules in hazardous solid waste. Background Technology

[0002] Aromatic hydrocarbons and aromatic-like compounds, such as toluene, p-xylene, and nitrobenzene, pose a significant threat to our health and safety. How to quickly and accurately identify these gases in complex gaseous environments has long been a focus of scientific attention. Compared to traditional GC-FID detectors or GC-MS methods, which suffer from drawbacks such as expensive equipment, slow analysis processes, and inconvenience for real-time on-site analysis, resistive sensors have enormous application potential in the field of gas detection due to their simple fabrication process, low cost, and ease of integration.

[0003] Molecularly imprinted polymers (MIPs) are novel, highly selective recognition materials developed by mimicking the antibody-receptor interaction in nature. Specifically, a target molecule is used as a template, and it binds to a functional monomer through covalent or non-covalent interactions. The polymer then forms a polymer of the functional monomer. After removing the template, a molecularly imprinted cavity is left on the imprinted polymer that matches the spatial structure, size, and shape of the target molecule and has effective action sites. This results in a specific recognition ability for the template molecule and offers advantages such as low cost, high availability, high stability, long lifespan, and the potential for large-scale production. Summary of the Invention

[0004] MIPs (Measuring Injectors) have great potential for improving selectivity and are widely used in various fields. Combining highly selective MIPs with resistive sensors to construct aromatic and aromatic-like gas sensors will help improve their selectivity.

[0005] The present invention provides a method for preparing an aromatic hydrocarbon molecular imprinted electrochemical sensor array, which belongs to the research field of aromatic hydrocarbon molecular gas sensors for hazardous and solid waste. It can achieve high-efficiency qualitative identification of carcinogenic and teratogenic aromatic hydrocarbon gas molecules at room temperature.

[0006] In one or more embodiments of this specification, an aromatic molecularly imprinted electrochemical sensor array is provided, the sensor array comprising multiple molecularly imprinted electrochemical sensors and one non-imprinted electrochemical sensor; the molecularly imprinted electrochemical sensor is prepared using aromatic molecularly imprinted material as functional material and conductive ink as basic material; the aromatic molecularly imprinted material is obtained by removing the template molecule after reaction using a molecule selected from toluene, ethylbenzene, xylene, or chlorobenzene as a template molecule and porogen, 4-vinylpyridine as a functional monomer, ethylene glycol dimethacrylate as a crosslinking agent, and azobisisobutyronitrile as an initiator.

[0007] Optionally, the test gas concentration of the aromatic molecularly imprinted electrochemical sensor array is from 0.2 ppm to 10 ppm.

[0008] Optionally, the plurality of molecularly imprinted electrochemical sensors include three different types of aromatic molecularly imprinted electrochemical sensors selected from toluene-imprinted electrochemical sensors, ethylbenzene-imprinted electrochemical sensors, xylene-imprinted electrochemical sensors, or chlorobenzene-imprinted electrochemical sensors.

[0009] Optionally, the preparation method of the aromatic molecular imprinted material includes: the template molecule, the porogen, the functional monomer, the crosslinking agent and the initiator are mixed uniformly by ultrasonication, an inert gas is introduced to remove oxygen, a thermally initiated polymerization reaction is carried out in an inert gas environment, and the aromatic molecular imprinted material is obtained after elution.

[0010] Optionally, the reaction conditions for the thermally initiated polymerization reaction include: oil bath at 80 to 110°C, rotation speed at 40 to 70 r / min, and reaction time at 12 to 36 h.

[0011] Optionally, the crosslinking agent and the functional monomer are subjected to vacuum distillation to remove the polymerization inhibitor before use.

[0012] Optionally, the initiator is purified by recrystallization from methanol before use.

[0013] Optionally, the method for preparing the molecularly imprinted electrochemical sensor includes: mixing and grinding aromatic molecularly imprinted materials, conductive ink and organic molecular binder to obtain a uniformly mixed slurry; coating the slurry onto interdigitated electrodes by spin coating or screen printing to prepare an aromatic molecule highly selective electrochemical sensor.

[0014] Optionally, the mass ratio of the aromatic molecular imprint material, the conductive ink, and the organic molecular binder is 1:(5-60):(10-100).

[0015] Optionally, the organic molecular binder includes ethyl cellulose and terpineol.

[0016] Optionally, the mass ratio of ethyl cellulose to terpineol in the organic molecular binder is from 5:95 to 3:97.

[0017] Optionally, the interdigitated electrodes are fabricated on a flexible PET substrate using a vacuum thermal deposition method with a mask.

[0018] Optionally, the overall size of the interdigitated electrode is (5-10) × (10-20) mm, comprising 5-10 pairs of electrodes, each pair having a width of 0.1-0.15 mm and a spacing of 0.1-0.15 mm between each pair of electrodes. A higher number of electrode pairs results in a more stable gas response value.

[0019] Optionally, the electrode material of the interdigitated electrode can be chromium or gold.

[0020] Optionally, the area spin-coated or screen-printed is the same size as the interdigitated electrode area.

[0021] In one or more embodiments of this specification, an aromatic hydrocarbon molecule detection device is provided, comprising: an aromatic hydrocarbon molecularly imprinted electrochemical sensor array prepared as described in the embodiments of this specification, for generating an electrical signal of a gas to be tested; a signal preprocessing unit for converting the electrical signal obtained by the aromatic hydrocarbon molecularly imprinted electrochemical sensor array into a digital signal recognizable by a computer system; and a data analysis unit for analyzing the digital signal output by the signal preprocessing unit to obtain a qualitative analysis result of the gas to be tested.

[0022] Optionally, the signal preprocessing unit can also be used to perform data processing operations including noise reduction, amplification of the original signal, extraction of signal features, and data normalization.

[0023] Optionally, the data analysis unit employs a neural network algorithm.

[0024] Optionally, the signal preprocessing unit can be a six-and-a-half-bit multi-channel data acquisition unit.

[0025] In one or more embodiments of this specification, an electronic nose system is provided, comprising: a sample introduction device for providing a test gas to an aromatic molecule detection device; an aromatic molecule detection device prepared as described in the embodiments of this specification for detecting the test gas obtained from the sample introduction device and generating a digital signal corresponding to the test gas; and a display device for receiving the digital signal from the detection device and displaying the qualitative analysis result of the test gas based on the digital signal.

[0026] In one or more embodiments of this specification, an aromatic molecularly imprinted electrochemical sensor array prepared according to the embodiments of this specification is provided for the detection of aromatic molecules (C4H4H4H4H4H4H4H4H4H4H4H4H4H4H4H5 ... nH 2n+2 Applications in ).

[0027] Optionally, the hazardous solid waste aromatic molecules may include aromatic molecules that are liquid at room temperature.

[0028] Optionally, the hazardous solid waste aromatic molecules may include monocyclic or polycyclic aromatic molecules lacking a recognition site, wherein the recognition site includes a hydroxyl, carboxyl, or amino group.

[0029] Optionally, the hazardous solid waste aromatic molecules may include toluene, ethylbenzene, xylene, chlorobenzene, nitrobenzene, or naphthalene.

[0030] This invention discloses a method for preparing an aromatic hydrocarbon molecularly imprinted electrochemical sensor array. The sensor is prepared by spin-coating or screen-printing different molecularly imprinted sensitive materials on interdigitated electrodes, and a 4-channel sensor array is constructed using different molecularly imprinted sensors to achieve efficient and accurate identification of aromatic hydrocarbon molecules.

[0031] This invention discloses a sensor fabricated using molecularly imprinted materials as functional materials and conductive ink as the base material. This sensor enables the selective identification of aromatic hydrocarbon molecules in hazardous solid waste. Furthermore, a sensor array is constructed to achieve high-accuracy qualitative identification of different aromatic hydrocarbon molecules. Compared to the complex fabrication processes currently used for volatile organic compounds (VOCs) sensors, this invention is simpler, more convenient, and lower in cost. The process used can detect a wider range of aromatic hydrocarbon molecules, achieving efficient detection and reducing environmental pollution. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 The real-time response curve of the single aromatic molecule-imprinted electrochemical sensor provided in the embodiments of this specification to the target gas is shown. Detailed Implementation

[0034] For the qualitative identification of gases in the field of research on aromatic molecular gases in hazardous solid waste, traditional gas detection methods are mostly aimed at volatile organic compounds (VOCs) with functional groups such as hydroxyl and carboxyl groups, and the detection temperature is above 150℃, which is complicated, energy-intensive and costly.

[0035] In the embodiments of this specification, a molecularly imprinted material is added to conductive ink and organic molecular binders (e.g., ethyl cellulose and terpineol) and ground in an agate mortar to obtain a uniformly mixed slurry. Sensors are prepared by screen printing different molecularly imprinted sensitive materials on interdigital electrodes, and a 4-channel sensor array is constructed using different molecularly imprinted sensors to achieve efficient and accurate identification of aromatic molecules.

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described with reference to the following embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0037] The embodiments in this specification relate to a method for detecting aromatic gas molecules in hazardous solid waste. Molecularly imprinted materials are prepared using a precipitation polymerization method, and these materials are used as functional materials to prepare an electrochemical sensor, thereby achieving highly selective identification of aromatic molecules in hazardous solid waste.

[0038] Example 1: Preparation of aromatic molecularly imprinted materials

[0039] 4-Vinylpyridine (4-VP), ethylene glycol dimethacrylate (EGDMA), azobisisobutyronitrile (AIBN), and liquid aromatic molecules are added to a reaction vessel, and ultrasonication is used to ensure uniform mixing of the substances. Then, nitrogen is used to degas the system to remove oxygen, ensuring that free radical-initiated polymerization can proceed smoothly. Finally, under nitrogen protection, thermally initiated polymerization is carried out to obtain aromatic molecularly imprinted materials, also known as molecularly imprinted polymers (MIPs).

[0040] The liquid aromatic molecule can be one of toluene, ethylbenzene, xylene, or chlorobenzene. The xylene can be p-xylene, o-xylene, or m-xylene. Alternatively, the liquid aromatic molecule can be one of toluene, ethylbenzene, p-xylene, o-xylene, m-xylene, or chlorobenzene.

[0041] In this embodiment, 4-VP serves as the functional monomer, EGDMA as the crosslinking agent, AIBN as the initiator, and the liquid aromatic molecule as both the template molecule and the porogen. In the embodiments described herein, the liquid aromatic molecule simultaneously functions as both a template and a porogen.

[0042] Optionally, when the amount of liquid aromatic molecule used as template molecule and porogen is 20 mL, the amount of functional monomer 4-VP can be 1-4 mmol (e.g., 1 mmol), the amount of crosslinking agent EGDMA can be 1-4 mmol (e.g., 2 mmol), and the amount of initiator AIBN can be 3.3 mg. In this case, the reaction vessel can be a 100 mL round-bottom flask.

[0043] Optionally, the crosslinking agent EGDMA and the functional monomer 4-VP are subjected to vacuum distillation to remove the polymerization inhibitor before use.

[0044] Optionally, the initiator AIBN is purified by recrystallization from methanol before use.

[0045] Optionally, the duration of the mixed ultrasound can be, for example, about 15 minutes, and the duration of nitrogen degassing can be, for example, about 15 minutes.

[0046] Optionally, the reaction conditions for thermally initiated polymerization can be: oil bath at 80 to 110°C (e.g., 100°C), rotation speed at 40 to 70 r / min (e.g., 50 r / min), and reaction time at 12 to 36 h (e.g., 24 h).

[0047] It is understood that when the liquid aromatic molecule is toluene, toluene MIP is obtained; when the liquid aromatic molecule is ethylbenzene, ethylbenzene MIP is obtained; when the liquid aromatic molecule is p-xylene, p-xylene MIP is obtained; when the liquid aromatic molecule is m-xylene, m-xylene MIP is obtained; when the liquid aromatic molecule is o-xylene, o-xylene MIP is obtained; and when the liquid aromatic molecule is chlorobenzene, chlorobenzene MIP is obtained. The range of liquid aromatic molecules in the embodiments of this specification is not limited to the examples given herein.

[0048] The preparation process of the corresponding non-imprinting polymer (NIP) is completely consistent with that of MIP, except that the components that play the role of template molecules and porogens are replaced by acetonitrile solvent.

[0049] Example 2: Fabrication of interdigitated electrodes

[0050] In the embodiments of this specification, interdigitated electrodes are fabricated using vapor deposition. Specifically, the interdigitated electrodes are fabricated by depositing electrode material onto a flexible PET substrate using a vacuum thermal deposition method via a mask.

[0051] The overall size of the interdigital electrodes is controlled by a photomask. The overall size of the interdigital electrodes is 10×10mm, consisting of 8 pairs of electrodes, each pair being 7mm wide, with a spacing of 0.15mm between each pair.

[0052] The electrode materials are 10nm Cr and 100nm gold. The use of Cr helps to increase the adhesion of Au.

[0053] Example 3: Preparation of a highly selective electrochemical sensor for aromatic hydrocarbon molecules

[0054] The MIP prepared in Example 1 was mixed and ground with conductive ink and organic molecular binder (e.g., in an agate mortar) to obtain a uniformly mixed slurry; the slurry was then coated onto the interdigitated electrode prepared in Example 2 by screen printing to obtain a highly selective electrochemical sensor for aromatic molecules.

[0055] MIP serves as a functional material, while conductive ink serves as both a basic material and a conductive agent.

[0056] The organic molecular binder may include a mixture of ethyl cellulose and terpineol. Optionally, the mass ratio of ethyl cellulose to terpineol may be 5:95.

[0057] Optionally, the mass ratio of MIP, conductive ink, and organic molecular binder can be 1:(5-60):(10-100), preferably 1:13:20. For example, 15mg of MIP, 0.2g of conductive ink, and 0.3g of organic molecular binder can be used.

[0058] In Example 3, the prepared highly selective electrochemical sensor for aromatic molecules can detect aromatic molecule gases at room temperature.

[0059] Example 4: Gas detection of aromatic hydrocarbon molecules in hazardous solid waste using a sensor array

[0060] In this specification, the electrochemical sensor device constructed in Example 3 is used to test for aromatic molecules in hazardous solid waste (e.g., gases such as toluene, ethylbenzene, or xylene).

[0061] Specifically, the static injection method can be used to conduct tests within the designed test chamber. This allows for the detection of lower concentration gases by using smaller gas sources. As an example, the test chamber is made of steel with a volume of 200×200×200mm. There is a vent on the left side of the chamber, and a sample inlet and a well-sealed, wired circuit on the right side. An electric fan and a heating device are placed inside the chamber.

[0062] For device response characteristic testing, an example of the test procedure can be as follows: First, measure the baseline for 1 minute. After the device stabilizes, inject liquid solid aromatic hydrocarbon molecules (e.g., toluene, ethylbenzene, or p-xylene liquid) at a gas concentration equivalent to 10 ppm, and simultaneously record the device resistance change. When the resistance change tends to stabilize, open the chamber door to allow the gas to evaporate. The response magnitude is obtained according to the formula ΔR / R0×100 (ΔR=R-R0, where R0 is the device resistance at the end of the baseline, and R is the response value after 30 seconds).

[0063] Figure 1 The real-time response curve of the single aromatic molecule-imprinted electrochemical sensor provided in the embodiments of this specification to the target gas is shown.

[0064] like Figure 1 According to the real-time response curve of the device to the target gas, it can be seen that the aromatic molecularly imprinted electrochemical sensor provided in the embodiments of this specification can recover to 90% of the response value within 10 seconds.

[0065] Experiments show that, based on the device provided in the embodiments of this specification, the gas response to aromatic molecules takes only 30 seconds, and the sensor can recover to its original state within 10 seconds.

[0066] Array testing method: The array is configured as a 4-channel array test, using sensors made of NIP and molecularly imprinted materials such as toluene, xylene, ethylbenzene, or chlorobenzene. The concentration of all tested gases is fixed at 10 ppm, converted to the corresponding liquid volume, and injected into the chamber. The response time is fixed at 30 seconds. The change in resistance over time is recorded, and the response at 30 seconds is calculated for comparison. Note that after measuring one substance, the device must be restored to its original resistance value to avoid affecting subsequent measurements of other substances.

[0067] As an example, a four-array electrochemical sensor was constructed using NIP, toluene MIP, xylene MIP and chlorobenzene MIP, and tests were performed on gases of different concentrations. Some test results are shown in Table 1 and Table 2.

[0068] Table 1. Partial test data of the array electrochemical sensor for toluene, xylene, or chlorobenzene.

[0069]

[0070] Table 2. Partial test data of the array electrochemical sensor for other gases.

[0071]

[0072] In Tables 1 and 2, the test data specifically refers to the dataset of response values ​​during the test process, which is ΔR / R0×100.

[0073] In the embodiments of this specification, a composite membrane gas sensor array modified with molecularly imprinted polymers and semiconductor materials is used as the detection device. The surface membrane contains imprinted cavities capable of selectively adsorbing aromatic hydrocarbon molecules. When different target molecules arrive at the surface of the molecularly imprinted material, the sensors composed of different materials exhibit different response values ​​to the target gas, thereby altering the conductivity of the semiconductor material and causing different changes in the sensor's resistance.

[0074] Furthermore, by using an aromatic molecule electrical sensor array with molecularly imprinted materials as functional materials, a highly sensitive electronic nose can be constructed. Compared to the complex preparation and high-temperature detection of aromatic molecules currently available, the gas sensor array prepared in this invention is small in size, low in manufacturing cost, simple and efficient in detection method, and has a wide detection range. It is a new method for highly selective detection

[10] and has broad application prospects.

[0075] Example 5: Construction of an Aromatic Hydrocarbon Molecule Detection Device Based on Sensor Array

[0076] In the embodiments of this specification, the aromatic hydrocarbon molecule detection device may consist of a sensor array sensing system, a data acquisition system, and an artificial intelligence data analysis system. The sensor array sensing system is a sensor constructed from molecularly imprinted materials with specific recognition properties for target molecules. The data acquisition system is a six-and-a-half-bit data acquisition system, and the data analysis system uses a neural network algorithm for processing, enabling qualitative analysis of aromatic hydrocarbon molecules in hazardous solid waste.

[0077] Specifically, an aromatic hydrocarbon molecule detection device can be constructed that includes at least an aromatic hydrocarbon molecularly imprinted electrochemical sensor array, a signal preprocessing unit, and a data analysis unit. The aromatic hydrocarbon molecularly imprinted electrochemical sensor array receives the physical information of the gas to be tested and generates an electrical signal for the gas. The signal preprocessing unit converts the electrical signal obtained from the aromatic hydrocarbon molecularly imprinted electrochemical sensor array into a digital signal recognizable by a computer system. The data analysis unit analyzes the digital signal output by the signal preprocessing unit to obtain a qualitative analysis result of the gas to be tested.

[0078] In the embodiments of this specification, the data analysis unit employs a BP neural network algorithm.

[0079] Optionally, the BP neural network can be designed with three layers. The number of nodes in each layer of the BP neural network can be set as needed, for example, the input layer has 5 nodes, the hidden layer has 7 nodes, and the output layer has 3 nodes.

[0080] Optionally, during the training of the BP neural network, the learning rate can be set to 0.7 and the standard deviation can be set to 0.02. Optionally, iterative training stops when the output error of the neural network is less than the standard deviation. Alternatively, a maximum number of iterations can be set, and training stops when the preset maximum number of iterations is reached.

[0081] Optionally, the training process of the BP neural network can be carried out by using 2 / 3 of the total training sample data for network training and the remaining 1 / 3 as test data.

[0082] Alternatively, the above-mentioned BP neural network design can be implemented using C++.

[0083] In the embodiments of this specification, the BP neural network trained as described above can be used to analyze the results output by the sensor array.

[0084] The aromatic molecular imprinted electrochemical sensor array or device prepared using the examples in this specification was used to test the aromatic molecules in hazardous solid waste. The test results are shown in Table 3.

[0085] Table 3 Test Results of Neural Network Algorithms

[0086]

[0087] As shown in Table 3, the aromatic molecule imprinted electrochemical sensor array or device provided in the embodiments of this specification can achieve specific recognition of aromatic molecules such as toluene, xylene, and chlorobenzene.

[0088] Specifically, when multiple aromatic hydrocarbon molecules (e.g., toluene, xylene, and chlorobenzene) are present in the presence of other gases, the accuracy of qualitative identification of aromatic hydrocarbon molecules can reach 94%.

[0089] When a single aromatic molecule (e.g., toluene, xylene, or chlorobenzene) is present in the presence of other gases, the accuracy of qualitative identification of aromatic molecules can reach 100%.

[0090] The other gases may include, but are not limited to, ethanol, methanol, isopropanol, acetonitrile, chloroform, cyclohexane, n-hexane, ethyl acetate, etc.

[0091] Based on one or more embodiments of this specification, the detectable hazardous solid waste aromatic molecules are a class of environmental pollutants with "three-fold" toxicity (carcinogenic, mutagenic, and teratogenic) that are widely present in nature. These mainly include monocyclic or polycyclic hazardous solid waste aromatic molecules, and may be molecules lacking a recognition site. The hazardous solid waste aromatic molecules include, but are not limited to, toluene, ethylbenzene, xylene, chlorobenzene, nitrobenzene, or naphthalene. The recognition site may include hydroxyl, carboxyl, or amino groups.

[0092] Based on one or more embodiments of this specification, highly selective and sensitive detection of aromatic molecules in hazardous solid waste is achieved at room temperature, and different signal changes can be collected in 30 seconds, enabling rapid detection of aromatic molecules. Furthermore, the construction of a 4-array electrochemical sensor enables highly accurate qualitative identification of aromatic molecules.

[0093] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than those shown in the embodiments and may still achieve the desired results.

[0094] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An array of arene molecularly imprinted electrochemical sensors, characterized in that, The sensor array consists of multiple molecularly imprinted electrochemical sensors and one non-imprinted electrochemical sensor. The molecularly imprinted electrochemical sensor is prepared using aromatic molecularly imprinted material as the functional material, conductive ink as the basic material, and conductive agent. Specifically, the molecularly imprinted electrochemical sensor is prepared by mixing and grinding the aromatic molecularly imprinted material with conductive ink and organic molecular binder into a slurry, and then coating it onto the electrode. The aromatic molecular imprinted material is prepared by precipitation polymerization, specifically by using a molecule selected from toluene, ethylbenzene, xylene, or chlorobenzene as a template molecule and a porogen, 4-vinylpyridine as a functional monomer, ethylene glycol dimethacrylate as a crosslinking agent, and azobisisobutyronitrile as an initiator, and then removing the template molecule after the reaction to obtain the material. The sensor array is used to detect aromatic molecules in hazardous solid waste, including monocyclic or polycyclic aromatic molecules lacking recognition sites, which include hydroxyl, carboxyl, or amino groups.

2. The aromatic molecularly imprinted electrochemical sensor array as described in claim 1, characterized in that, The plurality of molecularly imprinted electrochemical sensors include three different types of sensors selected from toluene-imprinted electrochemical sensors, ethylbenzene-imprinted electrochemical sensors, xylene-imprinted electrochemical sensors, or chlorobenzene-imprinted electrochemical sensors.

3. The aromatic molecularly imprinted electrochemical sensor array as described in claim 1, characterized in that, The preparation method of the aromatic molecular imprinted material includes: The template molecule, porogen, functional monomer, crosslinking agent, and initiator are mixed uniformly by ultrasonication, and an inert gas is introduced to remove oxygen. The polymerization reaction is thermally initiated in an inert gas environment, and the aromatic molecular imprinted material is obtained after elution.

4. The aromatic molecularly imprinted electrochemical sensor array as described in claim 3, characterized in that, The reaction conditions for the thermally initiated polymerization reaction include: oil bath 80 to 110°C, rotation speed 40 to 70 r / min, and reaction time 12 to 36 h. Alternatively, the crosslinking agent and the functional monomer are subjected to vacuum distillation to remove the polymerization inhibitor before use; Alternatively, the initiator may be purified by recrystallization from methanol before use.

5. The aromatic molecularly imprinted electrochemical sensor array as described in claim 1, characterized in that, The method for preparing the molecularly imprinted electrochemical sensor includes: Aromatic molecular imprinting material, conductive ink and organic molecular binder are mixed and ground to obtain a uniformly mixed slurry; The slurry was coated onto the interdigitated electrodes by spin coating or screen printing to prepare a highly selective electrochemical sensor for aromatic molecules.

6. The aromatic molecularly imprinted electrochemical sensor array as described in claim 5, characterized in that, The mass ratio of the aromatic molecular imprint material, the conductive ink, and the organic molecular binder is 1: (5-60): (10-100); the organic molecular binder includes ethyl cellulose and terpineol.

7. An aromatic hydrocarbon molecule detection device, characterized in that, include: The aromatic molecularly imprinted electrochemical sensor array according to any one of claims 1 to 6 is used to generate an electrical signal of the gas to be measured; The signal preprocessing unit is used to convert the electrical signals obtained from the aromatic molecularly imprinted electrochemical sensor array into digital signals that can be recognized by the computer system. The data analysis unit is used to analyze the digital signal output by the signal preprocessing unit to obtain the qualitative analysis results of the gas to be tested.

8. The apparatus as claimed in claim 7, characterized in that, The data analysis unit employs a neural network algorithm.

9. An electronic nose system, characterized in that, Include: The sample introduction device is used to provide the target gas for the aromatic molecule detection device; The aromatic molecule detection device as described in claim 7 is used to detect the gas to be tested obtained from the sample introduction device and generate a digital signal corresponding to the gas to be tested. as well as The display device receives the digital signal from the detection device and displays the qualitative analysis results of the gas to be tested based on the digital signal.

10. The application of the aromatic molecular imprinted electrochemical sensor array as described in any one of claims 1 to 6 in the detection of aromatic molecules in hazardous solid waste.

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