Metal ion-conducting graphene oxide-based chemical sensor and method of making the same

Abstract

The application provides a preparation method of a metal ion conductive graphene oxide-based chemical sensor, and comprises the following steps: S1, dispersing graphene oxide into an aqueous solution to obtain a graphene oxide solution through ultrasonic treatment; S2, adding an inorganic metal salt into deionized water to obtain a metal ion precursor solution through dissolution; S3, mixing the metal ion precursor solution with the graphene oxide solution to obtain a conductive active sensitive material; S4, performing surface plasma treatment on a substrate modified with an interdigital electrode, uniformly distributing the conductive active sensitive material on the surface of the substrate, forming a sensitive detection layer, and then performing annealing and solidification to form a metal ion-graphene oxide composite sensing layer on the surface of the substrate, so that the metal ion conductive graphene oxide-based chemical sensor is prepared. The metal ion conductive graphene oxide-based chemical sensor prepared by the application is composed of a substrate, an interdigital electrode and a metal ion-graphene oxide composite sensing layer, and is applied to organic amine sensing and detection.

Description

Technical Field

[0001] This invention belongs to the field of nanomaterials and chemical sensor technology, specifically relating to a metal ion-conductive graphene oxide-based chemical sensor and its preparation method. Background Technology

[0002] Organic amines are nitrogen-containing organic compounds formed by the chemical reaction of organic substances with ammonia. They can typically induce lesions in human tissues or organs, causing irreversible damage to the skin, eyes, and digestive tract, and also possess direct or indirect carcinogenic toxicity. Furthermore, organic amines are important chemical intermediates and raw materials, widely used in the synthesis of fine chemical products such as pesticides, pharmaceuticals, cosmetics, bioactive natural products, and functional materials. Some organic amines are frequently found in human diets; for example, cadaverine is a class of bioactive low-molecular-weight nitrogen compounds, primarily derived from the microbial degradation of lysine. Cadaverine is widely present in various foods, and its content is closely related to food quality, making it a significant cause of food poisoning and thus identified as one of the most important indicators of food spoilage. Short-term exposure to high doses of organic amines can lead to health risks such as respiratory diseases, immune system disorders, and central nervous system damage. Cadaverine is also associated with halitosis and is closely linked to the development of various cancers. Therefore, achieving highly sensitive and selective detection of organic amines is of great significance for food safety, industrial production, environmental remediation, and human health.

[0003] In recent years, numerous analytical methods have been applied to the detection of organic amines. Among them, chromatography is the most commonly used method for determining these substances in food, such as thin-layer chromatography, gas chromatography, and high-performance liquid chromatography. However, these methods often require extensive sample pretreatment, consume large amounts of reagents, are time-consuming, and require large-scale chromatographic equipment, making it impossible to achieve rapid, convenient, environmentally friendly, and low-cost on-site real-time detection of target substances.

[0004] Unlike chromatography, chemical gas sensors circumvent issues such as sample pretreatment and large-scale equipment, offering unprecedented advantages in gas detection. Chemical gas sensors primarily monitor target gas concentrations through changes in the electrical signals of the sensing device (such as capacitance, resistance, and voltage). Currently, electronically conductive sensors are the most widely used. These devices generally have a wide detection range and good stability; however, because their sensing function relies mainly on surface oxidation-reduction reactions and electron migration between the electronically conductive material and the target analyte, their sensitivity and selectivity are often poor. In contrast, ion-conductive materials, which use ions as charge carriers, typically possess richer composition and processability, exhibiting diverse and specific interactions with the target analyte. This can significantly improve the sensitivity and selectivity of sensors; however, the application of these materials in the sensor field remains largely unreported.

[0005] Therefore, developing chemical sensors using ion-conductive materials that can detect the types and concentrations of organic amines with high sensitivity and selectivity, while also possessing advantages such as low cost, ease of preparation, and high reproducibility, has significant application value for human safety in production and food safety. Summary of the Invention

[0006] This invention is made to solve the above-mentioned problems, and aims to provide a metal ion-conductive graphene oxide-based chemical sensor and its preparation method.

[0007] This invention provides a method for preparing a metal ion-conductive graphene oxide-based chemical sensor, characterized by the following steps:

[0008] Step S1: Graphene oxide is dispersed in an aqueous solution and subjected to ultrasonic treatment to obtain a graphene oxide solution.

[0009] Step S2: Add the inorganic metal salt to deionized water and stir continuously until completely dissolved to obtain a metal ion precursor solution.

[0010] Step S3: Mix the metal ion precursor solution with the graphene oxide solution to obtain a conductive active sensitive material.

[0011] Step S4: Perform surface plasma treatment on the substrate modified with interdigitated electrodes, then uniformly distribute conductive active sensitive material on the substrate surface to form a sensitive detection layer, followed by annealing and curing to form a metal ion-graphene oxide composite sensing layer on the upper surface of the substrate, thus preparing a metal ion conductive graphene oxide-based chemical sensor.

[0012] The preparation method of the metal ion-conductive graphene oxide-based chemical sensor provided by the present invention may also have the following characteristics: in step S1, when performing ultrasonic treatment, the ultrasonic treatment is performed at room temperature for 10 min-30 min, the concentration of graphene oxide in the graphene oxide solution is 1 mg / mL-5 mg / mL, and the graphene oxide is a graphene oxide family material with active groups, including aminated graphene oxide, sulfonated graphene oxide, and carboxylated graphene oxide.

[0013] The method for preparing a metal ion-conductive graphene oxide-based chemical sensor provided by this invention may also have the following feature: in step S2, the stirring time is 5 min-10 min, and the inorganic metal salt is one or more of nitrates, chlorides, sulfates, and acetates.

[0014] The metal ions in the metal ion precursor solution are one or more of cobalt ions, magnesium ions, nickel ions, zinc ions, copper ions, silver ions, and iron ions, and the concentration of the metal ions is 0.1 mol / L to 1.0 mol / L.

[0015] The method for preparing a metal ion-conductive graphene oxide-based chemical sensor provided by the present invention may also have the following feature: in step S3, during mixing, the material is continuously stirred at room temperature for 5 min-20 min and then sonicated for 5 min-10 min to obtain a conductive active sensitive material.

[0016] The preparation method of the metal ion-conductive graphene oxide-based chemical sensor provided by the present invention may also have the following feature: in step S4, when annealing and curing, the annealing and curing is carried out in a vacuum oven at 40℃-80℃ for 0.5h-4.0h.

[0017] The method for preparing a metal ion-conductive graphene oxide-based chemical sensor provided by the present invention may also have the following features: in step S4, the substrate is any one of non-conductive inorganic material, organic material or polymer material, and the material of the interdigitated electrode is a metal conductive material, which is any one of gold, silver, copper, cadmium and indium tin oxide.

[0018] The method for preparing a metal ion-conductive graphene oxide-based chemical sensor provided by the present invention may also have the following feature: in step S4, when the conductive active sensitive material is uniformly distributed on the substrate surface, any one of spin coating, drop coating, blade coating, or dip-coating is used.

[0019] The present invention also provides a metal ion-conductive graphene oxide-based chemical sensor, which is prepared by the above-described method for preparing a metal ion-conductive graphene oxide-based chemical sensor and has the following features: a substrate; interdigitated electrodes modified on the surface of the substrate; and a metal ion-graphene oxide composite sensing layer disposed on the surface of the substrate and tightly bonded to the interdigitated electrodes.

[0020] The present invention also provides an application of the above-mentioned metal ion-conducting graphene oxide-based chemical sensor in the sensing and detection of organic amines, as follows: The metal ion-conducting graphene oxide-based chemical sensor is connected to a sensing and detection device. After being connected via an external electrode, the sensor is placed in a test chamber of a certain volume. After the chamber is sealed, a certain concentration of organic amine gas or solution is injected into the test chamber. The device monitors the capacitance change of the sensor to obtain a sensing response signal. The detected organic amine is one or a mixture of common organic amines such as cadaverine, ethanolamine, trimethylamine, formamide, and aniline.

[0021] The role and effect of invention

[0022] According to the present invention, a metal ion-conductive graphene oxide-based chemical sensor and its preparation method are prepared by mixing graphene oxide solution and metal ion precursor solution to obtain a conductive active sensitive material, then uniformly distributing the conductive active sensitive material on the surface of an electrode substrate to form a sensitive detection layer, and then using a vacuum low-temperature curing method to tightly bond the sensitive detection layer with the electrode, thereby preparing a metal ion-conductive graphene oxide-based chemical sensor.

[0023] This invention uses commercially available graphene oxide as a matrix, effectively targeting free metal ions through the hydroxyl and carboxyl groups on the graphene oxide surface. The graphene oxide matrix possesses unique two-dimensional material properties, facilitating assembly and surface functionalization. In composite processes with metals, metal oxides, or polymers, it provides high specific surface area and active sites, and exhibits good dispersibility in water. By suppressing the migration and aggregation of metal components through coordination complexation, the controllable synthesis of ion-conducting semiconductors is achieved. Furthermore, leveraging the good dispersibility and processability of the composite semiconductor, uniform distribution of conductive active sensitive materials on the sensing electrode surface is achieved, overcoming the challenges of sensor consistency and stability.

[0024] Meanwhile, graphene oxide can provide channels for ion migration, enabling the ion conduction properties of metal ion-graphene oxide composite materials. Using graphene oxide as a conductive matrix can effectively improve the scalability and performance uniformity of devices. Furthermore, the highly dispersed metal ion concentration can be adjusted by changing the inorganic metal salt content. Targeted metal ions can chelate with organic amine molecules to form stable coordination complexes, enabling real-time monitoring of trace organic amines with high sensitivity and selectivity, allowing for rapid and accurate identification of organic amines in complex environments.

[0025] Furthermore, the sensing conductivity mechanism of this invention is based on the conduction of doped metal ions. The diversity of metal ions can enhance the response diversity of the device, effectively improving the selectivity of the sensor compared to traditional chemical sensors based on electrons or holes as charge carriers. When the prepared metal ion-conductive graphene oxide-based chemical sensor is used for detection, it directly uses the change in capacitance electrical signal as the output signal, without the need for special additional devices to convert a certain physical or chemical quantity into an electrical signal for measurement. Therefore, the device structure is simple, which is conducive to miniaturization and portability.

[0026] Therefore, the metal ion-conductive graphene oxide-based organic amine chemical sensor involved in this invention is prepared by a highly controllable solution method, which is simple, low-cost, and suitable for large-scale production. Furthermore, the prepared metal ion-conductive graphene oxide-based organic amine chemical sensor has high sensitivity and high selectivity, enabling real-time monitoring of trace amounts of organic amines and rapid and accurate identification of organic amines in complex scenarios. It has good application prospects in fields such as sensing and food safety. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the metal ion-conductive graphene oxide-based chemical sensor in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the chemical structure of the metal ion-graphene oxide composite sensing layer in Embodiment 1 of the present invention;

[0029] Figure 3 This is a graph showing the response results of the metal ion-conductive graphene oxide-based chemical sensor in Example 1 of the present invention for detecting different volumes of cadaverine.

[0030] Figure 4 This is a graph showing the instantaneous response of the metal ion-conductive graphene oxide-based chemical sensor to different volatile organic compounds in Example 1 of the present invention.

[0031] Figure 5 This is a graph showing the long-term response of the metal ion-conductive graphene oxide-based chemical sensor to different volatile organic compounds in Example 1 of the present invention. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the metal ion-conductive graphene oxide-based chemical sensor of this invention and its preparation method.

[0033] <Example 1>

[0034] This embodiment describes a method for preparing a metal ion-conductive graphene oxide-based chemical sensor, comprising the following steps:

[0035] Step S1: Graphene oxide is dispersed in an aqueous solution and subjected to ultrasonic treatment to obtain a graphene oxide solution. The specific process is as follows:

[0036] Commercially available graphene oxide was dispersed in deionized water and sonicated for 10-20 minutes to form a homogeneous solution with a concentration of 3.0 mg / mL, thus obtaining a graphene oxide solution.

[0037] Step S2: Add the inorganic metal salt to deionized water and stir continuously until completely dissolved to obtain a metal ion precursor solution. The specific process is as follows:

[0038] Dissolve Cu(NO3)2·3H2O powder in deionized water and stir continuously for 5-10 minutes to form a homogeneous solution of 0.6 mol / L, thus obtaining the metal ion precursor solution.

[0039] Step S3 involves mixing the metal ion precursor solution with the graphene oxide solution to obtain a conductive and active sensitive material. The specific process is as follows:

[0040] The metal ion precursor solution and the graphene oxide solution were mixed at a volume ratio of 1:1, stirred continuously for 10-20 minutes, and then ultrasonically treated for 5-10 minutes to form a homogeneous mixed solution, thus obtaining a conductive active sensitive material.

[0041] Step S4: Perform surface plasma treatment on the substrate modified with interdigitated electrodes to uniformly distribute the conductive active sensitive material on the substrate surface to form a sensitive detection layer. Then, anneal and cure to form a metal ion-graphene oxide composite sensing layer on the upper surface of the substrate, thus preparing a metal ion-conductive graphene oxide-based chemical sensor. The specific process is as follows:

[0042] Conductive glass with indium tin oxide (ITO) interdigitated electrodes was used as a substrate. The substrate was treated with plasma for 2-5 minutes to remove residual impurities and form a certain surface microstructure without damaging the electrode material. Then, the conductive active sensitive material was uniformly distributed on the treated substrate surface by spin coating at 3000 r / min for 60 seconds to form a sensitive detection layer. Subsequently, the substrate was annealed and cured at 70℃ for 1 hour under vacuum to remove moisture and form a metal ion-graphene oxide composite sensing layer on the upper surface of the substrate, thus preparing a metal ion conductive graphene oxide-based chemical sensor.

[0043] In this embodiment, when performing surface treatment on the substrate, surface treatment techniques such as ozone cleaning can also be used.

[0044] In this embodiment, the prepared metal ion-conductive graphene oxide-based chemical sensor is Cu. 2+ Ion-loaded graphene oxide-based chemical sensor.

[0045] Figure 1 This is a schematic diagram of the structure of the metal ion-conductive graphene oxide-based chemical sensor in Embodiment 1 of the present invention.

[0046] like Figure 1As shown, the metal ion-conductive graphene oxide-based chemical sensor 100 of this embodiment includes a substrate 10, a metal ion-graphene oxide composite sensing layer 20, and interdigitated electrodes 30.

[0047] Interdigitated electrodes 30 are modified on the surface of substrate 10, and metal ion-graphene oxide composite sensing layer 20 is disposed on the surface of substrate 10 and tightly bonded to interdigitated electrodes 30.

[0048] Figure 2 This is a schematic diagram of the chemical structure of the metal ion-graphene oxide composite sensing layer in Embodiment 1 of the present invention.

[0049] like Figure 2 As shown, in the metal ion-graphene oxide composite sensing layer, graphene oxide serves as the matrix. Free metal ions are targeted by the hydroxyl and carboxyl groups on the graphene oxide surface, and ion conduction characteristics are achieved by loading metal ions. Furthermore, metal ions replace traditional electron and hole carriers, and the exposed metal ion carriers can directly interact with specific target gases, achieving high sensitivity and high selectivity detection.

[0050] In this embodiment, the cadaverine detection performance of the prepared metal ion-conductive graphene oxide-based chemical sensor was also tested, as detailed below:

[0051] A metal ion-conductive graphene oxide-based chemical sensor was fixed at the bottom of a 6L sealed chamber and connected to a TH2827C LCR analyzer via wires. After the capacitance signal stabilized, different volumes of cadaverine liquid were injected, and the changes in the sensor's capacitance characteristics were recorded.

[0052] Figure 3 This is a graph showing the response results of the metal ion-conductive graphene oxide-based chemical sensor in Example 1 of the present invention for detecting different volumes of cadaverine.

[0053] like Figure 3 As shown, the metal ion-conductive graphene oxide-based chemical sensor prepared in this embodiment exhibits a fast response rate to various concentrations of cadaverine. For example, when the injected cadaverine volumes are 0.02 μL, 0.06 μL, 0.1 μL, 0.2 μL, 0.4 μL, 0.6 μL, 0.8 μL, and 1 μL, the relative responses are 2.3%, 5.1%, 8.5%, 14.2%, 34.8%, 45.7%, 70.0%, and 84.6%, respectively.

[0054] When the sensor came into contact with the cadaverine atmosphere, its capacitance decreased rapidly, and after a period of time, it reached equilibrium. After air was introduced to dilute the cadaverine, the sensor's capacitance did not recover. Linear fitting of the above response results revealed that the sensor's response to different concentrations of cadaverine exhibited a good linear correlation.

[0055] Furthermore, 1 μL of acetone, dichloromethane, dimethyl carbonate, ethanol, n-hexane, toluene, and cadaverine were injected into the test chamber, and the changes in the capacitance characteristics of the sensor were recorded.

[0056] Figure 4 This is a graph showing the instantaneous response of the metal ion-conductive graphene oxide-based chemical sensor to different volatile organic compounds in Example 1 of the present invention. Figure 5 This is a graph showing the long-term response of the metal ion-conductive graphene oxide-based chemical sensor to different volatile organic compounds in Example 1 of the present invention.

[0057] like Figure 4 and Figure 5 As shown, the sensor exhibits very small responses to volatile organic compounds other than cadaverine, and these responses show a reversible trend. However, it shows a significant and irreversible response to cadaverine. In terms of instantaneous response, the sensor's response to cadaverine is significantly higher than that to other chemical gases. After the response signal stabilizes, in terms of long-term response, the response to other chemical gases is close to zero, while the response to cadaverine remains large and irreversible. This indicates that the metal ion-conductive graphene oxide-based chemical sensor of this embodiment has high sensitivity and selectivity to cadaverine.

[0058] <Example 2>

[0059] This embodiment describes a method for preparing a metal ion-conductive graphene oxide-based chemical sensor, comprising the following steps:

[0060] Step S1: Graphene oxide is dispersed in an aqueous solution and subjected to ultrasonic treatment to obtain a graphene oxide solution. The specific process is as follows:

[0061] Commercially available graphene oxide was dispersed in deionized water and sonicated for 10-15 minutes to form a homogeneous solution with a concentration of 2.0 mg / mL, thus obtaining a graphene oxide solution.

[0062] Step S2: Add the inorganic metal salt to deionized water and stir continuously until completely dissolved to obtain a metal ion precursor solution. The specific process is as follows:

[0063] Dissolve Zn(NO3)2·6H2O powder in deionized water and stir continuously for 5-10 minutes to form a homogeneous solution of 0.6 mol / L, thus obtaining the metal ion precursor solution.

[0064] Step S3 involves mixing the metal ion precursor solution with the graphene oxide solution to obtain a conductive and active sensitive material. The specific process is as follows:

[0065] The metal ion precursor solution and the graphene oxide solution were mixed at a volume ratio of 1:1, stirred continuously for 5 min-20 min, and then ultrasonically treated for 5 min-10 min to form a homogeneous mixed solution, thus obtaining a conductive active sensitive material.

[0066] Step S4: Perform surface plasma treatment on the substrate modified with interdigitated electrodes to uniformly distribute the conductive active sensitive material on the substrate surface to form a sensitive detection layer. Then, anneal and cure to form a metal ion-graphene oxide composite sensing layer on the upper surface of the substrate, thus preparing a metal ion-conductive graphene oxide-based chemical sensor. The specific process is as follows:

[0067] Conductive glass with indium tin oxide (ITO) interdigitated electrodes was used as a substrate. The substrate was treated with plasma for 3-8 minutes and then spin-coated at 2000 r / min for 50 seconds to uniformly distribute the conductive active sensitive material on the treated substrate surface, forming a sensitive detection layer. Subsequently, the substrate was annealed and cured at 50℃ for 1.5 h under vacuum to form a metal ion-graphene oxide composite sensing layer on the upper surface of the substrate, thus preparing a metal ion conductive graphene oxide-based chemical sensor.

[0068] In this embodiment, the prepared metal ion-conductive graphene oxide-based chemical sensor is Zn. 2+ Ion-loaded graphene oxide-based chemical sensor.

[0069] In this embodiment, the cadaverine detection performance of the prepared metal ion-conductive graphene oxide-based chemical sensor was also tested, as detailed below:

[0070] A metal ion-conductive graphene oxide-based chemical sensor was fixed at the bottom of a 6L sealed chamber and connected to a TH2827C LCR analyzer via wires. After the capacitance signal stabilized, different volumes of cadaverine liquid were injected, and the changes in the sensor's capacitance characteristics were recorded.

[0071] The sensing performance of different volumes of cadaverine, such as 0.1 μL and 1 μL, was tested, with corresponding responses of 3.2% and 42.9%, respectively. The metal ion-conductive graphene oxide-based chemical sensor of this embodiment exhibits a fast response speed to all concentrations of cadaverine. When the sensor comes into contact with the cadaverine atmosphere, the capacitance decreases rapidly and reaches equilibrium after a period of time. After dilution with air, the sensor's capacitance does not recover, indicating that the sensor exhibits an irreversible high response to cadaverine.

[0072] The role and effect of the embodiments

[0073] As can be seen from Examples 1 and 2, Cu was prepared in Examples 1 and 2 respectively. 2+-Graphene oxide composite sensing layer and Zn 2+ - A graphene oxide composite sensing layer, using graphene oxide as a matrix, loads copper and zinc ions respectively to achieve ion conduction properties. Metal ions replace traditional electron and hole carriers, and the exposed metal ion carriers can directly interact with specific target gases, thereby achieving high sensitivity and high selectivity detection.

[0074] Furthermore, based on the test results of the metal ion-conductive graphene oxide-based chemical sensor prepared in Examples 1 and 2, it is possible to achieve real-time monitoring of trace amounts of cadaverine, and has high sensitivity and high selectivity. It exhibits an irreversible specific response to cadaverine and can quickly and accurately identify cadaverine in complex environments where common volatile organic compounds are present.

[0075] Furthermore, the metal ion-conductive graphene oxide-based chemical sensors prepared in Examples 1 and 2 directly use changes in capacitance as the output signal, eliminating the need for specialized additional devices to convert a physical or chemical quantity into an electrical signal for measurement. Therefore, their structure is simple, facilitating miniaturization and portability. Simultaneously, the fabrication process is simple, low-cost, easy to use, and readily achievable for large-scale production.

[0076] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A method for preparing a metal ion-conductive graphene oxide-based chemical sensor, characterized in that, Includes the following steps: Step S1: Graphene oxide is dispersed in an aqueous solution and subjected to ultrasonic treatment to obtain a graphene oxide solution, wherein the concentration of graphene oxide in the graphene oxide solution is 1 mg / mL-5 mg / mL. Step S2: Add the inorganic metal salt to deionized water and stir continuously until completely dissolved to obtain a metal ion precursor solution. The inorganic metal salt is one or more of nitrate, chloride, sulfate and acetate. The metal ion in the metal ion precursor solution is one or more of cobalt ion, magnesium ion, nickel ion, zinc ion, copper ion, silver ion and iron ion. The concentration of the metal ion is 0.1 mol / L to 1.0 mol / L. Step S3: Mix the metal ion precursor solution and the graphene oxide solution at a volume ratio of 1:1 to obtain a conductive active sensitive material. Step S4: Perform surface plasma treatment on the substrate modified with interdigitated electrodes, then uniformly distribute the conductive active sensitive material on the substrate surface to form a sensitive detection layer. Subsequently, anneal and cure to form a metal ion-graphene oxide composite sensing layer on the upper surface of the substrate, thus preparing a metal ion-conductive graphene oxide-based chemical sensor. The metal ion-conductive graphene oxide-based chemical sensor exhibits high sensitivity and selectivity for organic amines.

2. The method for preparing the metal ion-conductive graphene oxide-based chemical sensor according to claim 1, characterized in that: in, When performing ultrasonic treatment in step S1, the ultrasound is conducted at room temperature for 10-30 minutes.

3. The method for preparing the metal ion-conductive graphene oxide-based chemical sensor according to claim 1, characterized in that: in, In step S2, the stirring time is 5-10 minutes.

4. The method for preparing the metal ion-conductive graphene oxide-based chemical sensor according to claim 1, characterized in that: in, In step S3, during mixing, the conductive active sensitive material is obtained by continuously stirring for 5 min-20 min at room temperature and then sonicating for 5 min-10 min.

5. The method for preparing a metal ion-conductive graphene oxide-based chemical sensor according to claim 1, characterized in that: in, In step S4, during annealing and curing, the material is annealed and cured in a vacuum oven at 40℃-80℃ for 0.5h-4.0h.

6. The method for preparing the metal ion-conductive graphene oxide-based chemical sensor according to claim 1, characterized in that: in, In step S4, the substrate is any one of non-conductive inorganic material, organic material, or polymer material. The interdigitated electrodes are made of a metallic conductive material.

7. The method for preparing the metal ion-conductive graphene oxide-based chemical sensor according to claim 1, characterized in that: in, In step S4, when uniformly distributing the conductive active sensitive material on the substrate surface, any one of the following methods can be used: spin coating, blade coating, or dip-coating.

8. A metal ion-conducting graphene oxide-based chemical sensor, prepared by the method for preparing the metal ion-conducting graphene oxide-based chemical sensor according to any one of claims 1 to 7, characterized in that, include: Substrate; Interdigitated electrodes are modified on the surface of the substrate; as well as A metal ion-graphene oxide composite sensing layer is disposed on the surface of the substrate and tightly bonded to the interdigitated electrodes.

9. The application of the metal ion-conductive graphene oxide-based chemical sensor as described in claim 8 in the sensing and detection of organic amines.

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