Sensitive material for detecting gastric cancer interference gas acetone, sensor and preparation method

Abstract

The invention relates to a sensitive material for detecting gastric cancer interference gas acetone, a sensor and a preparation method, the preparation method of the sensitive material for detecting gastric cancer interference gas acetone comprises the following steps: S1, weighing gadolinium nitrate hexahydrate, ferric nitrate nonahydrate and salicylic acid, and dispersing and dissolving in a mixed solvent to form a mixed solution; s2, transferring the mixed solution into a high-pressure kettle, heating the high-pressure kettle in a drying oven for a period of time, and obtaining a reaction product after the reaction of the mixed solution is completed; s3, cleaning and drying the reaction product to obtain a dried product; and S4, annealing and calcining the dried product in an air environment to obtain the GdFeO3 / Fe3O4 sensitive material, and the GdFeO3 / Fe3O4 sensitive material is used for detecting the gastric cancer interference gas acetone. According to the embodiment of the invention, the sensor prepared from the GdFeO3 / Fe3O4 sensitive material can be used for detecting acetone at high sensitivity, low detection lower limit, high stability and high humidity.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensors, and particularly relates to a sensitive material, a sensor and a preparation method for detecting acetone, an interfering gas of gastric cancer. Background Art

[0002] In the detection of human breath markers for gastric cancer, there are many interfering gases. As an exhaled breath marker for diabetes patients, acetone is one of the important interfering gases, and efficient detection and elimination are required to ensure the accurate detection of gastric cancer markers.

[0003] Existing technical methods for acetone detection include solid-phase microextraction-gas chromatography / mass spectrometry, infrared spectroscopy, and high-performance liquid chromatography. Solid-phase microextraction-gas chromatography / mass spectrometry is a technical method based on chemical separation and sensitive detection. This method has the advantages of improving detection speed, improving detection accuracy, and reducing detection costs. At the same time, it can also detect the content of harmful substances in acetone. Infrared spectroscopy is a detection method based on the principle of molecular vibration, which can detect the molecular structure and chemical bond information of acetone; compared with gas chromatography / mass spectrometry, infrared spectroscopy has the advantages of fast detection speed and simple sample preparation, and is suitable for technical detection in the field of acetone management. High-performance liquid chromatography is a commonly used separation technology and detection method, which can detect additives and impurities in acetone, etc.

[0004] However, existing acetone detection has the defects of high cost, large size, and difficulty in being integrated on mobile devices. At the same time, the detection accuracy is relatively low under high humidity, the working temperature is relatively high, and the energy consumption is relatively high, which has certain limitations on the secondary development of sensors. Therefore, it is necessary to develop a gas sensor that has good selectivity for acetone at a relatively low working temperature, and at the same time has good stability for acetone detection under high humidity. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a sensitive material, a sensor and a preparation method for detecting acetone, an interfering gas of gastric cancer. The technical problems to be solved by the present invention are realized through the following technical solutions:

[0006] The embodiment of the present invention provides a preparation method for a sensitive material for detecting acetone, an interfering gas of gastric cancer, including the steps of:

[0007] S1. Weigh gadolinium nitrate hexahydrate, ferric nitrate nonahydrate and salicylic acid and disperse and dissolve them in a mixed solvent to form a mixed solution;

[0008] S2. Transfer the mixed solution to an autoclave, and heat the autoclave in an oven for a period of time. After the reaction of the mixed solution is completed, a reaction product is obtained;

[0009] S3. Wash and dry the reaction product to obtain a dried product;

[0010] S4. Anneal and calcine the dried product in an air environment to obtain a GdFeO 3 / Fe 3 O 4 sensitive material, and the GdFeO 3 / Fe 3 O 4 sensitive material is used to detect acetone, an interfering gas for gastric cancer.

[0011] In one embodiment of the present invention, step S1 includes:

[0012] Weigh the gadolinium nitrate hexahydrate, iron nitrate nonahydrate, and salicylic acid with a molar ratio of 1:3:3 and disperse them in a mixed solvent of glycerol and isopropanol with a mass ratio of 1:2.2, and stir at room temperature until completely dissolved to form the mixed solution.

[0013] In one embodiment of the present invention, step S2 includes:

[0014] Transfer the mixed solution to a Teflon-lined stainless steel autoclave, and heat the autoclave in an oven at 170 - 190 °C for 10 - 14 hours. Wait until the reaction of the mixed solution is completed to obtain the reaction product.

[0015] In one embodiment of the present invention, step S3 includes:

[0016] Wash the reaction product alternately with deionized water and ethanol, and dry it in a vacuum drying oven to obtain the dried product.

[0017] In one embodiment of the present invention, step S4 includes:

[0018] Put the dried product into a muffle furnace, heat the muffle furnace to 850 - 950 °C at a heating rate of 1 - 5 °C / min, and then anneal and calcine the dried product at 850 - 950 °C in an air environment for 60 - 120 min to obtain the GdFeO 3 / Fe 3 O 4 sensitive material.

[0019] Another embodiment of the present invention provides a sensitive material for detecting acetone, an interfering gas for gastric cancer, which is prepared by the preparation method described in the above embodiment, and the sensitive material is GdFeO 3 / Fe 3 O 4 sensitive material.

[0020] Another embodiment of the present invention provides a method for preparing a sensor for detecting acetone, an interfering gas in gastric cancer, comprising the steps:

[0021] S1. Grind and mix the sensitive material described in the above embodiment with water to form a paste-like slurry;

[0022] S2. Coat the paste-like slurry on the outer surface of a ceramic tube to form a gas-sensitive material film;

[0023] S3. Bake the coated ceramic tube for a period of time. After the gas-sensitive material film is dried, put the ceramic tube into a muffle furnace for calcination to obtain a gas sensor.

[0024] In one embodiment of the present invention, the mass ratio of the sensitive material to the water in step S1 is 2:1 to 5:1;

[0025] The thickness of the gas-sensitive material film in step S2 is 15 to 30 μm;

[0026] The baking time of the coated ceramic tube in step S3 is 10 to 20 min, the calcination temperature of the ceramic tube is 120 to 350 °C, and the calcination time is 30 to 50 min.

[0027] Another embodiment of the present invention provides a sensor for detecting acetone, an interfering gas in gastric cancer, which is prepared by the preparation method described in the above embodiment.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] By means of the hydrothermal method, the present invention uses gadolinium nitrate hexahydrate, iron nitrate nonahydrate and salicylic acid to prepare a GdFeO 3 / Fe 3 O 4 sensitive material. The work functions of GdFeO 3 and Fe 3 O 4 are different. During the contact process of the two substances, a hole transfer phenomenon will occur, thus forming a p-n heterojunction. The formation of the heterojunction promotes the electron transport of the material itself, effectively enhancing the electron transport ability, and at the same time changing the work function of the material to a certain extent, which is beneficial to the performance improvement. In addition, the addition of the rare earth element Gd has a great influence on the sensitive material itself, changing the content of oxygen vacancies in the material itself, increasing the adsorbed oxygen content of the sensitive material, further improving the gas-sensitive performance of the sensor under high humidity, and improving the response degree and selectivity of the sensor at a lower working temperature. Therefore, the sensor prepared with this sensitive material can achieve high sensitivity, low detection limit, high stability and detection under high humidity for acetone. Description of the Drawings

[0030] Figure 1 Schematic flow chart of a preparation method of a sensitive material for detecting acetone, an interfering gas of gastric cancer, provided by an embodiment of the present invention;

[0031] Figure 2 Schematic flow chart of a preparation method of a sensor for detecting acetone, an interfering gas of gastric cancer, provided by an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the sensor provided by an embodiment of the present invention;

[0033] Figure 4 X-ray diffraction pattern of the sensitive material prepared according to an embodiment of the present invention;

[0034] Figure 5 Scanning electron microscope image of the sensitive material prepared according to an embodiment of the present invention;

[0035] Figure 6 Transmission electron microscope image of the sensitive material prepared according to an embodiment of the present invention;

[0036] Figure 7 Response curve graph of the sensitive material prepared according to an embodiment of the present invention to 100 ppm acetone at different temperatures;

[0037] Figure 8 Response and recovery curve graph of the sensor provided by an embodiment of the present invention to 100 ppm acetone at 200 °C;

[0038] Figure 9 Response and recovery curve graph of the sensor provided by an embodiment of the present invention to acetone at different concentrations at 200 °C;

[0039] Figure 10 Fitting curve graph of the response of the sensor provided by an embodiment of the present invention to acetone at different concentrations at 200 °C;

[0040] Figure 11 Graph of ten-cycle test of the sensor provided by an embodiment of the present invention to 100 ppm acetone at 200 °C;

[0041] Figure 12 Bar graph of response values of the sensor provided by an embodiment of the present invention to 100 ppm of different types of detection gases at 200 °C;

[0042] Figure 13 Stability response comparison graph of the sensor provided by an embodiment of the present invention to 100 ppm acetone within 60 days at 200 °C;

[0043] Figure 14 Resistance and response curve graph of the sensor provided by an embodiment of the present invention at 200 °C and different humidities. Detailed implementation manners

[0044] The present invention will be further described in detail below in conjunction with specific embodiments, but the implementation manners of the present invention are not limited thereto.

[0045] Embodiment 1

[0046] Please refer to Figure 1 , Figure 1 , which is a schematic flow chart of a preparation method of a sensitive material for detecting acetone, an interfering gas of gastric cancer, provided by an embodiment of the present invention. The preparation method of the sensitive material for detecting acetone, an interfering gas of gastric cancer, includes the following steps:

[0047] S1. Weigh gadolinium nitrate hexahydrate, ferric nitrate nonahydrate and salicylic acid and disperse and dissolve them in a mixed solvent to form a mixed solution.

[0048] Specifically, weigh gadolinium nitrate hexahydrate Gd(NO 3 ) 3 ·6H 2 O, ferric nitrate nonahydrate Fe(NO 3 ) 3 ·9H 2 O and salicylic acid C 7 H 6 O 3 and disperse them in a mixed solvent of glycerol and isopropanol. The mass ratio of glycerol to isopropanol is 1:2.2. Stir at room temperature until completely dissolved to form a uniform mixed solution.

[0049] S2. Transfer the mixed solution to an autoclave and heat the autoclave in an oven for a period of time. After the mixed solution reacts completely, a reaction product is obtained.

[0050] Specifically, transfer the mixed solution to a Teflon-lined stainless steel autoclave and heat the autoclave in an oven at 170 - 190 °C for 10 - 14 hours for hydrothermal reaction. After the mixed solution completely reacts, a reaction product is obtained.

[0051] S3. Wash and dry the reaction product to obtain a dried product.

[0052] Specifically, wash the reaction product three times alternately with deionized water and ethanol, and dry it in a vacuum drying oven. The drying temperature is 60 °C and the drying time is 12 h to obtain a dried product.

[0053] S4. Anneal and calcine the dried product in an air environment to obtain a GdFeO 3 / Fe 3 O 4 sensitive material, GdFeO 3 / Fe 3 O 4The sensitive material is used to detect the interfering gas acetone for gastric cancer.

[0054] Specifically, the dried product is placed in a muffle furnace, and the temperature of the muffle furnace is raised to 850 - 950 °C at a heating rate of 1 - 5 °C / min, and then annealed in an air environment at 850 - 950 °C for 60 - 120 min to calcine the dried product. After the calcination is completed, GdFeO 3 / Fe 3 O 4 sensitive material is obtained.

[0055] This embodiment also provides a sensitive material for detecting the interfering gas acetone for gastric cancer. This material is GdFeO 3 / Fe 3 O 4 sensitive material, which is prepared by the above preparation method. It can be understood that this sensitive material is a mixture of GdFeO 3 and Fe 3 O 4 mixture.

[0056] In this embodiment, through the hydrothermal method, GdFeO 3 / Fe 3 O 4 sensitive material is prepared by using gadolinium nitrate hexahydrate, iron nitrate nonahydrate and salicylic acid. The work functions of GdFeO 3 and Fe 3 O 4 are different. During the contact process of the two substances, the phenomenon of hole transfer will occur, thus forming a p-n heterojunction. The formation of the heterojunction promotes the electron transport of the material itself, effectively enhances the electron transport ability, and also changes the work function of the material to a certain extent, which is beneficial to the performance improvement; in addition, the addition of rare earth element Gd has a huge impact on the sensitive material itself, changes the content of oxygen vacancies in the material itself, increases the adsorbed oxygen content of the sensitive material, further improves the gas-sensing performance of the sensor at high humidity, and improves the response and selectivity of the sensor at a lower working temperature; therefore, the sensor prepared with this sensitive material can achieve high sensitivity, low detection limit, high stability and detection under high humidity for acetone.

[0057] Embodiment 2

[0058] Based on Embodiment 1, this embodiment provides a sensor for detecting the interfering gas acetone for gastric cancer and its preparation method.

[0059] Please refer to Figure 2 , Figure 2 which is a schematic flow chart of the preparation method of a sensor for detecting the interfering gas acetone for gastric cancer provided by an embodiment of the present invention. This preparation method includes the steps:

[0060] S1. Mix the sensitive material of Example 1 with water by grinding to form a paste-like slurry.

[0061] Specifically, place the sensitive material powder in a mortar, add an appropriate amount of deionized water, grind for 30 s to mix, and form a paste-like slurry; the mass ratio of the sensitive material powder to deionized water is 2:1 to 5:1.

[0062] S2. Coat the outer surface of the ceramic tube with the paste-like slurry to form a gas-sensitive material film.

[0063] Specifically, take the ground paste-like slurry and evenly coat it on the outer surface of the ceramic tube with a brush to form a gas-sensitive material film with a thickness of 15 - 30 μm. Among them, the ceramic tube is provided with a pair of gold electrodes and four platinum leads; the length of the ceramic tube is 3.9 - 4.2 mm, the inner diameter is 0.7 - 1.1 μm, and the outer diameter is 1.1 - 1.4 μm.

[0064] S3. Bake the coated ceramic tube for a period of time. After the gas-sensitive material film is dried, put the ceramic tube into a muffle furnace for calcination to obtain a gas sensor.

[0065] Specifically, bake the coated ceramic tube for 10 - 20 min. After the gas-sensitive material film is completely dried, put the ceramic tube into a muffle furnace at 120 - 350 °C for calcination for 30 - 50 min.

[0066] This embodiment also provides a sensor for detecting acetone, an interfering gas in gastric cancer. Please refer to Figure 3 , Figure 3 which is a schematic diagram of the sensor provided by the embodiment of the present invention. The sensor includes a ceramic tube and a hexagonal base. Among them, the ceramic tube is provided with a pair of gold electrodes and four Pt wire pins, and a Ni-Cr heater is arranged inside. The surface of the ceramic tube is evenly coated with GdFeO 3 / Fe 3 O 4 sensitive material to form a gas-sensitive material film; pass the resistance wire through the ceramic tube and weld it to two pins in the middle of the hexagonal base, and finally weld the four Pt wire pins of the ceramic tube to the hexagonal base to complete the production of the sensor.

[0067] This embodiment uses a tubular device to prepare an acetone gas sensor. The sensor uses GdFeO 3 / Fe 3 O 4 sensitive material, which has strong electron transport ability, improves the gas-sensitive performance of the sensor at high humidity, and improves the response and selectivity of the sensor at a lower working temperature, and can achieve high sensitivity, low detection limit, high stability and detection under high humidity for acetone.

[0068] It should be noted that for acetone gas sensors, the detection of acetone can be achieved through other device structures. For example: planar devices, flexible devices, and MEMS devices can all use GdFeO 3 / Fe 3 O 4 gas-sensitive materials to prepare gas sensors and achieve high-performance detection of acetone.

[0069] Example 3

[0070] Based on Example 1 and Example 2, this example further illustrates the sensitive materials and sensors for detecting the interfering gas acetone in gastric cancer through the following experiments.

[0071] 1. Preparation of sensitive materials.

[0072] S1. Weigh 1 mol of gadolinium nitrate hexahydrate Gd(NO 3 ) 3 ·6H 2 O, 3 mol of iron nitrate nonahydrate Fe(NO 3 ) 3 ·9H 2 O and 3 mol of salicylic acid C 7 H 6 O 3 and disperse them in a mixed solvent of glycerol and isopropanol. The mass of glycerol in the mixed solvent is 10 g, and the mass of isopropanol is 22 g. Stir at room temperature until fully dissolved to obtain a homogeneous mixed solution.

[0073] S2. Transfer the homogeneous solution to a 50 ml Teflon-lined stainless steel autoclave and heat it in an oven at 180 °C for 12 hours.

[0074] S3. After all the solution has reacted, wash the reaction product three times alternately with deionized water and ethanol, and finally dry it in a vacuum drying oven at 60 °C for 12 h.

[0075] S4. Place the dried product in a muffle furnace and heat the muffle furnace at a heating rate of 5 °C / min to 900 °C, then anneal it in an air environment at 900 °C for 120 min. After calcination, the GdFeO 3 / Fe 3 O 4 sensitive material is obtained.

[0076] 2. Preparation of sensors.

[0077] S1. Put the GdFeO 3 / Fe 3 O 4 sensitive material powder in a mortar, add an appropriate amount of deionized water, and grind for 30 s to mix and form a paste-like slurry; SGdFeO 3 / Fe 3 O 4 The mass ratio of the sensitive material powder to deionized water is 3:1.

[0078] S2. Take the ground paste-like slurry and evenly coat it on the outer surface of the ceramic tube with a brush to form a gas-sensitive material film with a thickness of 30 μm. Among them, the ceramic tube is equipped with a pair of gold electrodes and four platinum leads; the length of the ceramic tube is 4 mm, the inner diameter is 1 μm, and the outer diameter is 1.2 μm.

[0079] S3. Bake the coated ceramic tube for 20 min. After the gas-sensitive material film is completely dried, put the ceramic tube into a muffle furnace at 350 °C and calcine it for 50 min.

[0080] Please refer to Figure 4 , Figure 4 which is the X-ray diffraction pattern of the sensitive material prepared in the embodiment of the present invention. It can be seen from the spectrum that the XRD diffraction peaks of the sample correspond to GdFeO 3 (#47-67), Gd 3 Fe 5 O 12 (#48-77) and Fe 3 O 4 (#88-315), and there are no other impurity peaks, which can prove the successful synthesis of Gd / Fe.

[0081] Please refer to Figure 5 , Figure 5 which is the scanning electron microscope image of the sensitive material prepared in the embodiment of the present invention. It can be seen from the figure that the spherical nanospheres are successfully synthesized.

[0082] Please refer to Figure 6 , Figure 6 which is the transmission electron microscope image of the sensitive material prepared in the embodiment of the present invention. It can be seen from the figure that the internal structure of the sample is a core-shell structure, and both the core structure and the shell structure contain GdFeO 3 / Fe 3 O 4 gas-sensitive material.

[0083] Please refer to Figure 7 , Figure 7 which is the response curve graph of the sensitive material prepared in the embodiment of the present invention to 100 ppm acetone at different temperatures. The sensor is transferred to the background gas of air to maintain stability and the resistance at this time is marked as R a ; the sensor is transferred to 100 ppm acetone gas, and the resistance is marked as R g when it is stable; the sensor is transferred to air and the resistance gradually recovers to R a ; the response value of the sensor to acetone is calculated according to the formula S = R g / R aIt is calculated that according to the test analysis, the optimal working temperature of the sensor is 200 °C and the highest response is 20.

[0084] Please refer to Figure 8 , Figure 8 which is the response and recovery curve of the sensor provided by the embodiment of the present invention to 100 ppm acetone at 200 °C. The response time (t res ) and the recovery time (t rec ) are calculated according to the time required for the sensor to reach 90% of the resistance change during the response and recovery stages to acetone. According to the calculation, the response of the sensor to acetone is only 90 s and the recovery time is 55 s, which indicates that the sensor can achieve fast response and recovery to acetone.

[0085] Please refer to Figure 9 , Figure 9 which is the response and recovery curve of the sensor provided by the embodiment of the present invention to acetone with different concentrations at 200 °C. It can be seen from the figure that the sensor has good linear growth in a large range.

[0086] Please refer to Figure 10 , Figure 10 which is the fitting curve of the sensor provided by the embodiment of the present invention to acetone with different concentrations at 200 °C. It can be seen from the figure that it maintains good linear growth in a large range and has a low detection limit at the same time.

[0087] Please refer to Figure 11 , Figure 11 which is the ten-cycle test curve of the sensor provided by the embodiment of the present invention to 100 ppm acetone at 200 °C. The sensors are all tested in 100 ppm acetone gas at 200 °C. After each response / recovery, the sensors can repeat the response / recovery process, and the response values to acetone show consistency. At the end of the test, the device resistance can return to the initial state. This indicates that the device has good repeatability during the test.

[0088] Please refer to Figure 12 , Figure 12 which is the bar chart of the response values of the sensor provided by the embodiment of the present invention to 100 ppm different types of detection gases at 200 °C. There may be various gases in the actual exhaled breath detection by the sensor. Therefore, ammonia, ethylbenzene, acetaldehyde, acetic acid, nitric oxide, hydrogen, methane and isoprene gases are also selected according to the application environment to analyze the selectivity of the sensor. It can be seen that the sensor has the highest response value to acetone, indicating that the sensor has unique selectivity to acetone gas.

[0089] Please refer to Figure 13 , Figure 13The stability response comparison chart of the sensor provided in the embodiment of the present invention to 100ppm acetone at 200℃ within 60 days. In order to evaluate the time stability of the gas sensor, the gas sensing performance test of the sensor was carried out for 60 days. It can be seen that during the 60-day test, the response value of the sensor to 100ppm acetone at 200℃ was maintained at about 20, and the fluctuation range was <5%, indicating that the sensor has good time stability.

[0090] See also Figure 14 , Figure 14 The resistance and response curves of the sensor provided in the embodiment of the present invention at 200°C and different humidity levels are shown. It can be seen that when the humidity increases from 40% RH to 90% RH, the water molecules will occupy some active sites and capture the electrons on the surface, thereby increasing the resistance. Then, some active sites are occupied, affecting the redox reaction of acetone gas, so that the response of the sensor decreases to a certain extent, down to 85% of the original, and still maintains good gas sensing performance.

[0091] In summary, the sensor of this embodiment can reach a response of 20 at a relatively low operating temperature (200°C), and the selectivity can reach more than 7 times that of other gases; it maintains good stability during the 60-day test; and finally, it can still reach 85% of the original response at a relatively high humidity (90%RH). The sensor of this embodiment achieves high sensitivity, low detection limit, high stability and detection under high humidity for acetone.

[0092] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for preparing a sensitive material for detecting gastric cancer interfering gas acetone, characterized in that: Includes steps: S1. Weigh gadolinium nitrate hexahydrate, ferric nitrate nonahydrate and salicylic acid and disperse and dissolve them in a mixed solvent to form a mixed solution; S2, transferring the mixed solution into an autoclave, and heating the autoclave in an oven for a period of time, until the mixed solution reacts completely, to obtain a reaction product; S3, washing and drying the reaction product to obtain a dry product; S4. Annealing and calcining the dried product in an air environment to obtain a GdFeO3 / Fe3O4 sensitive material, wherein the GdFeO3 / Fe3O4 sensitive material is used to detect acetone, a gas interfering gas for gastric cancer.

2. The method for preparing a sensitive material for detecting gastric cancer interfering gas acetone according to claim 1, characterized in that: Step S1 includes: The gadolinium nitrate hexahydrate, the ferric nitrate nonahydrate and the salicylic acid in a molar ratio of 1:3:3 are weighed and dispersed in a mixed solvent of glycerol and isopropanol in a mass ratio of 1:2.2, and stirred at room temperature until fully dissolved to form the mixed solution.

3. The method for preparing a sensitive material for detecting gastric cancer interfering gas acetone according to claim 1, characterized in that: Step S2 includes: The mixed solution is transferred to a Teflon-lined stainless steel autoclave, and the autoclave is heated in an oven at 170 to 190° C. for 10 to 14 hours, and the reaction of the mixed solution is completed to obtain the reaction product.

4. The method for preparing a sensitive material for detecting gastric cancer interfering gas acetone according to claim 1, characterized in that: Step S3 includes: The reaction product is washed alternately with deionized water and ethanol, and dried in a vacuum drying oven to obtain the dried product.

5. The method for preparing a sensitive material for detecting gastric cancer interfering gas acetone according to claim 1, characterized in that: Step S4 includes: The dried product is placed in a muffle furnace, and the temperature of the muffle furnace is increased to 850-950° C. at a heating rate of 1-5° C. / min, and then annealed at 850-950° C. for 60-120 min in an air environment to calcine the dried product to obtain the GdFeO3 / Fe3O4 sensitive material.

6. A sensitive material for detecting acetone, a gas interfering gas for gastric cancer, characterized in that: The sensitive material is prepared by the preparation method described in any one of claims 1 to 5, and the sensitive material is a GdFeO3 / Fe3O4 sensitive material.

7. A method for preparing a sensor for detecting gastric cancer interfering gas acetone, characterized in that: Includes steps: S1. Grind and mix the sensitive material according to claim 6 with water to form a paste-like slurry; S2, applying the paste slurry on the outer surface of the ceramic tube to form a gas-sensitive material film; S3, baking the coated ceramic tube for a period of time, and after the gas-sensitive material film is dried, placing the ceramic tube in a muffle furnace for calcination to obtain a gas sensor.

8. The method for preparing a sensor for detecting gastric cancer interfering gas acetone according to claim 7, characterized in that: In step S1, the mass ratio of the sensitive material to the water is 2:1 to 5:1; The thickness of the gas-sensitive material film in step S2 is 15 to 30 μm; The baking time of the coated ceramic tube in step S3 is 10 to 20 minutes, the calcination temperature of the ceramic tube is 120 to 350° C., and the calcination time is 30 to 50 minutes.

9. A sensor for detecting acetone, a gas interfering gas for gastric cancer, characterized in that: The compound is prepared by the preparation method according to any one of claims 7 to 8.

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