39results about How to "High response" patented technology

The invention discloses a micro electro mechanical system semiconductor hydrogen sensor and a preparation method thereof. The sensor comprises SnO2, Au and ZnO layers, a micro heating plate substrate and a ceramic substrate which are arranged from top to bottom, the method comprises the following steps: mounting a target material on a target position; stabilizing the micro heating plate substrate on a heating table; vacuumizing the sputtering chamber to enable the vacuum degree of the sputtering chamber to be below 5 * 10 <-3 > Pa; argon is introduced into the cavity until the pressure in the cavity reaches about 1 Pa; a ZnO film with the thickness of 50-200 nm is formed on the surface of the micro heating plate substrate; an Au film with the thickness of 2-10 nm is formed on the surface of the ZnO film, and a ZnO-Au composite material is obtained; and forming a SnO2 thin film with the thickness of 4-10nm on the surface of the Au thin film to obtain the ZnO-Au-SnO2 sandwich sensitive composite film. The sensor is high in response speed, short in recovery time and high in detection precision, and the hydrogen sensor with the high response value can be prepared through the method.

The invention discloses a SnO2 modified WO3 nanosheet composite gas-sensitive material as well as a preparation method and application thereof, and belongs to the technical field of inorganic composite materials. The preparation method comprises the following steps: dissolving WCl6 in ethanol, adding into a reaction kettle provided with a ceramic tube, carrying out hydrothermal reaction at 170-190 DEG C for 5-8 hours, taking out the ceramic tube, drying, and annealing to obtain a ceramic tube loaded with WO3 nanosheets; the preparation method comprises the following steps: dissolving SnO2, tin chloride and urea in water to obtain a mixed solution, adding the mixed solution into a reaction kettle filled with a ceramic tube loaded with a WO3 nanosheet, carrying out a hydrothermal reaction at 90-100 DEG C for 1-4 hours, taking out the ceramic tube after the reaction is finished, and drying to obtain the SnO2 modified WO3 nanosheet composite gas sensitive material, and enabling the SnO2 modified WO3 nanosheet to grow on the ceramic tube in situ. The preparation method is simple, the product is high in crystallinity and good in stability and is suitable for preparing a gas sensitive sensor material with high economical efficiency, and a sensor prepared from the SnO2 modified WO3 nanosheet composite gas sensitive material can effectively improve the gas sensitive performance of WO3 and shows an extremely high response value to nitrogen dioxide at a low temperature.

The invention belongs to the field of substance content detection, and discloses a method for determining the content of soybean phosphatidylcholine or phosphatidylethanolamine in a soft capsule, which comprises the following steps: (1) preparing a soybean phosphatidylcholine or phosphatidylethanolamine standard solution; (2) preparing a to-be-detected sample solution; (3) performing high performance liquid chromatography analysis; (4) drawing a standard curve; and (5) calculating the content of soybean phosphatidylcholine or phosphatidyl ethanolamine. The method has the advantages of high response value, short retention time and stable base line, and is not interfered by other components in the soft capsule; the method has the advantages of simple operation, high precision and good repeatability, the recovery rate meets the analysis requirement, and the method can efficiently, quickly and accurately detect the content of two components, namely soybean phosphatidylcholine and phosphatidyl ethanolamine, of soybean phospholipid in the soft capsule content.

The present invention relates to the field of drug analysis technology, and specifically to a Da Shanzhao Pill HPLC detection method, Da Shanzhao Pill fingerprint and application; the detection method includes Da Shanzhao Pill fingerprint and main index component quantitative method. A systematic investigation was conducted on different extraction methods, extraction time, extraction solvent, and extraction volume of samples to screen out the optimal extraction conditions; and the measurement data was systematically analyzed using chemometric tools. The results of the method are reliable and highly accurate, and can reflect the overall quality of commercially available Da Shanzhao Pills; the method can effectively monitor the quality status of Da Shanzhao Pills, and provide a scientific evaluation strategy for the control of the quality consistency and effectiveness of the preparation.

This invention relates to a tungsten-doped tin dioxide nanopowder, its preparation method, and its application in semiconductor-type gas-sensitive elements. The method for preparing the tungsten-doped tin dioxide nanopowder includes the following steps: dissolving a soluble tungsten compound and a soluble tin compound in an aqueous solution containing a surfactant, and adding a complexing agent to obtain a homogeneous metal ion mixed solution; adding a precipitant to the mixed solution under stirring conditions to adjust the pH to 2-6, causing a metal hydroxide precursor to precipitate; aging, solid-liquid separation, washing, and drying the precipitate to obtain a precursor powder; adding a dispersant to the precursor powder and mixing evenly; and calcining to obtain the tungsten-doped tin dioxide nanopowder. The tungsten-doped tin dioxide nanopowder of this invention can be used in the preparation of semiconductor-type gas-sensitive sensors, ultraviolet detectors, lithium-ion battery anode materials, catalysts, or transparent conductive films.

The invention provides a gas chromatographic analysis method of maleic anhydride, and belongs to the technical field of maleic anhydride analysis methods. As a maleic anhydride sample to be detected contains acidic substances and has a low response value on an FID (Flame Ionization Detector), according to the method provided by the invention, the BSTFA reagent is adopted for esterification treatment, the response value of the acidic substances in the sample to be detected is increased, a weak-polarity chromatographic column is adopted for gas chromatographic analysis, a hydrogen flame detector is used for detection, and an external standard method is used for quantitative calculation. The method provided by the invention has the advantages of high accuracy of the obtained detection result, good data repeatability and high sensitivity, can accurately analyze the maleic anhydride component concentration, has important guiding significance for quality control of maleic anhydride products produced by a device, and has good popularization and application values.

The invention is suitable for the field of gas sensor detection, and provides a mixed potential type ammonia gas sensor and a preparation method thereof. The mixed potential type ammonia gas sensor comprises a layered nickel silicate sensitive electrode, a reference electrode and a solid electrolyte, the layered nickel silicate sensitive electrode and the reference electrode are positioned on the surface of the solid electrolyte; the layered nickel silicate sensitive electrode is prepared from three kinds of layered nickel silicate electrode slurry with different morphologies. According to the invention, the layered nickel silicate is used as the sensitive electrode, so that the response value to ammonia gas is obviously improved at room temperature; compared with an existing most advanced mixed potential type ammonia gas sensor, the high-temperature mixed potential type ammonia gas sensor has the advantage that the low-concentration response to ammonia gas can be remarkably improved at room temperature compared with other high-temperature mixed potential type ammonia gas sensors.

The invention belongs to the technical field of bioengineering, and particularly relates to a BmoR protein mutant sensitively responding to phenethyl alcohol and application of the BmoR protein mutant in phenethyl alcohol detection or a biosensor. The BmoR protein mutant is obtained by mutation containing S184T on the basis of a wild type BmoR protein as shown in SEQ ID NO. 1 in a sequence table. The S184T mutant sensitively responds to phenethyl alcohol, so that the problem that wild type BmoR protein does not respond to a phenethyl alcohol high-yield strain is solved; meanwhile, the detection range of S184T on phenethyl alcohol reaches 0-30 mM, the response saturation of BmoR protein on phenethyl alcohol is improved, and the S184T can be used for screening and application of strains with higher yield.

The invention discloses a detection method for rapidly tracking a synthesis reaction of 2, 3-dihydrobenzofuran in the technical field of medical analysis, and the 2, 3-dihydrobenzofuran is detected by using a gas chromatography. According to the gas chromatography method, a dimethyl polysiloxane capillary chromatographic column is selected, and the method is suitable for detection of weak-polarity compounds. The gas chromatography method adopts an FID (Flame Ionization Detector). The method is high in response value, the 2, 3-dihydrobenzofuran product and impurities can be rapidly and effectively separated, the detection method is easy to operate, the stop time of the synthetic reaction can be fed back in time, over-reduced impurities are controlled at an extremely low level, the subsequent separation and purification operation is simple, high-purity products can be efficiently obtained, and the method is suitable for industrial production. And the applicability, specificity and sample introduction precision of the system all meet the requirements, and the problem of control of the synthetic reaction of the substance is solved.

The invention discloses a partially zwitterionic polyion liquid material, a humidity sensor with a full humidity sensing characteristic and a preparation method of the humidity sensor, and belongs to the technical field of humidity sensors. A polyion liquid material is prepared by adopting an alkene-sulfydryl click chemical reaction under ultraviolet light excitation, and a zwitterionic polymer chain is formed by grafting a sulfonic acid group on a branched chain of the polyion liquid. The humidity sensor is composed of a ceramic substrate and a sensitive layer, wherein the surface of the ceramic substrate is provided with 2-5 pairs of graphite carbon interdigital electrodes, and the sensitive layer is dispensed on the ceramic substrate and the graphite carbon interdigital electrodes. The sensor has excellent humidity sensitive characteristics in a relative humidity range of 11-95%, including high sensitivity, high stability, small humidity hysteresis and rapid response recovery characteristics, and solves the contradiction between optimization of recovery characteristics and sensitivity of most polyion liquid-based humidity sensors. The sensitivity of the polyion liquid-based humidity sensor is improved, the response recovery time of the polyion liquid-based humidity sensor can be shortened, and the humidity hysteresis of the polyion liquid-based humidity sensor can be reduced.

The invention belongs to the field of nano materials, and particularly relates to a Ga-doped Co3O4 nano flower, a preparation method and application of the Ga-doped Co3O4 nano flower as a gas sensitive material. The Ga-doped Co3O4 nanoflower is in a flower-ball shape, and the diameter of the Ga-doped Co3O4 nanoflower is 10 microns; the doping amount of the metal Ga is 1%-5% of the substance amount of the metal Co; the preparation method of the Ga-doped Co3O4 nanoflower comprises the following steps: synthesizing a multi-metal Co (OH) 2 nanoflower by a wet impregnation and freeze drying method, taking the multi-metal Co (OH) 2 nanoflower as a template, and roasting in an air atmosphere to prepare a Ga-Co3O4 gas sensitive material with a nanoflower morphology; the Ga-Co3O4 nanoflower gas sensitive material prepared by the preparation method disclosed by the invention has a good sensitive characteristic on CO; according to the invention, the heterogeneous element is used for replacing and preparing the bimetallic MOS to improve the gas-sensitive performance of the metal oxide, and the cost is low; the method is low in raw material cost, wide in source, simple in step, environmentally friendly, free of pollution, free of impurity ion introduction, capable of achieving mass production and convenient to achieve large-scale industrial production.

The present invention discloses a carbon dioxide gas-sensitive material based on platinum-modified neodymium iron magnesium oxide, a preparation method and an application thereof, and relates to the technical field of carbon dioxide gas detection. The chemical formula of the carbon dioxide gas-sensitive material based on platinum-modified neodymium iron magnesium oxide is Xwt%Pt-NdFe 1‑y Mg y O3, where 0

The invention discloses an Ag monatomic modified In2O3 single crystal film prepared based on pulse voltage discharge, a method thereof and a gas sensitive sensor, and the method comprises the following steps: 1) placing a substrate in a vacuum cavity of magnetron sputtering equipment, taking an indium oxide target as an In source, and growing on the substrate through a magnetron sputtering technology to obtain an indium oxide single crystal film; the substrate is yttrium oxide stabilized zirconia (YSZ); (2) placing the indium oxide single crystal thin film obtained in the step (1) on a vacuum chamber sample table which is internally provided with a pulse voltage discharge electrode and an Ag target material, evaporating Ag particles based on a pulse voltage discharge process, and depositing the Ag particles on the surface of the indium oxide single crystal thin film material to form dispersed clusters; and annealing to obtain the Ag single atom modified In2O3 single crystal thin film. The synthesis of a sensitive material with a high atom utilization rate and a stable structure is realized, and an advanced NO2 gas sensing device with high sensitivity and high selectivity is obtained.

The application discloses a kind of Ni doped nano SnO2 semiconductor HCHO sensing materials and preparation method and application thereof, and the preparation method of sensing material includes the following steps: step one, Sn salt-Ni salt solution is configured;Step two, using supercritical hydrothermal synthesis (CSHS) reaction device, Sn salt-Ni salt solution is contacted with supercritical water and crystallization is generated nano doped oxide, and reaction liquid is discharged and collected after cooling, and the crystalline material is separated, i.e. the Ni doped nano SnO2 semiconductor HCHO sensing material of the application.The Ni doped nano SnO2 semiconductor HCHO sensing material prepared by the method of the application has good structural consistency and excellent sensing performance.

The invention relates to a preparation method of Ag nanoparticle modified WO3 nanospheres for high-sensitivity detection of H2S gas. The preparation method comprises the following steps: 1) preparing a mixed solution; 2) preparing a precursor solution; 3) hydrothermal reaction; 4) centrifugal precipitation; and (5) preparing the Ag-WO3 nanospheres. According to the invention, a simple solvothermal and sodium borohydride (NaBH4) reduction method is adopted to synthesize the noble metal Ag nanoparticle (NPs) modified WO3 nanosphere gas sensor with controllable morphology and size. According to the AgNPs modified WO3 nanosphere disclosed by the invention, H2S gas can be detected at room temperature (25 DEG C), and the response value of the AgNPs modified WO3 nanosphere to 10ppm H2S gas reaches up to 2849 and is about 235 times that of pure WO3 (Ra / Rg is equal to 12.14); meanwhile, the sensor also has quick response capability (6s), low detection lower limit (10ppb), wide detection range (10ppb-40ppm) and excellent selectivity.

This invention belongs to the technical field of bactericide residue analysis and determination in plant-derived foods, specifically relating to a method for detecting isobutylethoxyquinoline and its metabolites in plant-derived foods. The method includes extraction with acetonitrile under citrate conditions, followed by purification with C18 (25 mg), PAX (25 mg), and XFM64 (nitrogen-doped multi-walled carbon nanotubes, 10 mg) adsorbents. Chromatographic separation is performed using a C18 column with methanol-2 mmol / L ammonium acetate (containing 0.1% formic acid) as the mobile phase, isocratic elution at a flow rate of 0.40 mL / min, electrospray ionization (ESI+), and detection in multiple reaction monitoring (MRM) mode. This invention is simple to operate, has high pretreatment efficiency, and its precision and recovery rate meet the regulatory residue limit monitoring requirements. It is suitable for the simultaneous determination of isobutylethoxyquinoline and its metabolites in plant-derived foods.

The invention discloses a preparation method of a high-performance NiO-based acetone gas-sensitive sensing element. The preparation method comprises the following steps: S1, mixing lithium fluoride and hydrochloric acid, adding titanium aluminum carbide, and carrying out ultrasonic treatment to obtain a few-layer Ti3C2Tx suspension; s2, dispersing nickel nitrate hexahydrate, hexadecyl trimethyl ammonium bromide and the few-layer Ti < 3 > C < 2 > T < x > turbid liquid into a methanol solution to perform hydrothermal reaction, washing, freeze-drying and performing heat treatment to obtain NiO / TiO2 powder; and S3, mixing the NiO / TiO2 powder with terpilenol, coating the mixture on the surfaces of an Al2O3 ceramic tube and an annular Au electrode, and carrying out high-temperature calcination to obtain the high-performance NiO-based acetone gas sensitive element. According to the preparation method of the high-performance NiO-based acetone gas-sensitive sensing element provided by the invention, a p-n TiO2 / NiO composite gas-sensitive material with high specific surface area and small substrate mass fraction is prepared, and the problem that a gas-sensitive sensor prepared by a traditional method loses excellent moisture resistance and selectivity is solved.

The invention provides a palladium sulfide composite molybdenum disulfide hierarchical nanostructure based nitrogen dioxide sensor and a preparation method thereof, and belongs to the technical field of sensors and composite nanomaterials. The sensor comprises a substrate and a gas sensitive layer loaded on the substrate, the gas sensitive layer is a palladium sulfide-molybdenum disulfide composite nanomaterial, PdS nanoparticle clusters in the palladium sulfide-molybdenum disulfide composite nanomaterial are embedded in the surface of MoS2 nanoflowers, and PdS and MoS2 form a heterojunction, so that the separation and transmission rate of current carriers is increased, and the performance of the gas sensor is improved. Therefore, the gas-sensitive performance of the nitrogen dioxide sensor is improved, and the nitrogen dioxide sensor has a high response value and fast response recovery time for NO2 with ppm-level concentration.

The present invention belongs to the technical field of drug intermediate analysis and detection, and provides an analysis and detection method for a hydrochloric acid cefuroxime intermediate cefuroxime precursor acid. The mobile phase of the analysis and detection method of the present invention is mainly composed of methanol and water, and tetrapentyl ammonium bromide and sodium dihydrogen phosphate are added, which can not only improve the solution stability of cefuroxime precursor acid, but also ensure the accuracy of the analysis and detection method results; and, the peak type, tailing factor, separation degree and theoretical plate number of the main component are significantly improved; and, impurity A, impurity B, impurity C and impurity D all have higher response values ​​and separation effects, and more unknown impurity peaks can be separated and detected. At the same time, the operation process of the analysis and detection method of the present invention is simple and convenient, the running time is short (within 30min), and it is suitable for rapid detection of industrial production; and the equipment requirements are not high, and the brand of the chromatographic column is not limited.

The invention discloses a video SAR (Synthetic Aperture Radar) target tracking method and system based on a spatio-temporal extension-accumulation strategy. The method comprises the following steps: dividing a video SAR image data set into N batch processing packets; extracting features of the initial position through a background perception correlation filter, obtaining initialization parameters and an initial filter template of the background perception correlation filter, and generating an initial candidate box; delimiting a target search area of a second frame based on the candidate frame of the first frame to obtain a plurality of test samples, calculating similarity and obtaining a response matrix; selecting S target prediction positions corresponding to the maximum response values from the response matrix; extracting features of each prediction position and updating a corresponding template to generate S candidate frames; performing repeated iteration to obtain # imgabs0 # candidate frames, and forming a multi-frame tree structure; the estimated position of the target in each frame of the tree structure is searched reversely, and candidate paths of # imgabs1 # target tracks are obtained; and selecting the candidate path with the maximum value function as the path of the target in one batch processing packet, and outputting the estimation state of the target in each frame.

The invention relates to a silver oxide / tungsten trioxide hollow microsphere composite material as well as a preparation method and application thereof, and belongs to the field of gas sensors. The microstructure of the silver oxide / tungsten trioxide hollow microsphere composite gas-sensitive material is that silver adheres to and grows on the surfaces of tungsten trioxide hollow microspheres in the form of silver oxide nanoparticles, silver oxide is of a cubic crystal system structure, tungsten trioxide is of a monoclinic crystal system structure, and the particle size of the silver oxide / tungsten trioxide hollow microsphere composite gas-sensitive material is 1-5 microns. And an interface region formed by the contact of the silver oxide and the tungsten trioxide is a p-n heterojunction. The three-dimensional graded hollow microsphere silver oxide / tungsten trioxide p-n heterojunction material is prepared by a simple hydrothermal method, has a biological olfactory sensing characteristic, reduces the preparation cost of a sensitive layer material of a bionic olfactory gas sensor, and has huge production and application prospects. The bionic olfactory sensor prepared by using the material as a sensitive layer material has the advantages of ultrahigh sensitivity, quick response capability, low detection lower limit, high selectivity and reliable stability.

The invention discloses a preparation method of a samarium vanadate powder material and a potential type carbon monoxide sensor taking samarium vanadate as a sensitive material. The sensor comprises a YSZ substrate, a zinc ferrite sensitive electrode, a reference electrode, an Ag point and an Ag lead, the sensitive material and the reference electrode are stacked and distributed on the surfaces of the two sides of the YSZ substrate, and the sensitive electrode is composed of platinum on the lower layer and samarium vanadate on the upper layer; the sensitive material has good electrocatalytic activity on carbon monoxide, and has high carbon monoxide sensitivity, selectivity and response rate. The sensor can detect the concentration of low-concentration carbon monoxide in real time, and the response of the sensor to detected gas is further improved.

The invention belongs to the field of nano materials, and particularly relates to a CeO2 composite Co3O4 nano flower, a preparation method and application of the CeO2 composite Co3O4 nano flower as a gas sensitive material. The CeO2 composite Co3O4 nanoflower is composed of a Co3O4 nanoflower and CeO2 nanoparticles uniformly dispersed on the surface of the Co3O4 nanoflower, the metal Ce is in a tetravalent state, and the doping amount of the metal Ce is 3-7% of the amount of the metal Co; the invention also provides a preparation method of the CeO2 composite Co3O4 nanoflower, and an application of the CeO2 composite Co3O4 nanoflower as a gas sensitive material in carbon monoxide detection, and the CeO2 composite Co3O4 nanoflower can be used for detecting 0.3-500ppm of CO at 0-500 DEG C. The invention also provides a preparation method of the CeO2 composite Co3O4 nanoflower. The preparation method of the CeO2 composite Co3O4 nanoflower is simple to operate, a three-dimensional polyhedral MOF is converted into a two-dimensional MOF through simple ionic heat assistance, the two-dimensional MOF is reassembled into a 3D nanoflower, further annealing is performed to obtain the bimetallic MOS nanoflower, the synthesis method is simple, environment-friendly and low in cost, and large-scale industrial production is convenient to realize; and the prepared CeO2 composite Co3O4 nanoflower gas sensitive material has a good sensitive characteristic on CO (carbon monoxide) of 0.3 to 500 ppm.

The invention discloses a reversed-phase liquid chromatography method for detecting related substances of lacosamide dry syrup, and belongs to the technical field of liquid chromatography analysis. The method comprises the following steps: injecting a test solution and a contrast solution into a liquid chromatograph, recording a chromatogram, and calculating the impurity content by peak area according to a self-contrast method. The method solves the problem that a certain impurity appears late or cannot be detected in the prior art, meanwhile, the response value is high, the separation degree meets the requirement, the blank of detection of the related substances of the lacosamide dry syrup is filled, the specificity is high, the sensitivity is high, and the requirements for purity detection of the substances and quantitative detection of the related substances can be met.

The invention relates to the technical field of detection, and provides a detection method for simultaneously detecting 11 terpene compounds in health care wine, which comprises the following steps: removing non-volatile components such as sugar, pigment and the like in the health care wine by solvent-assisted evaporation extraction, performing liquid-liquid micro-extraction on terpene target objects by using a polar and non-polar mixed extraction agent, and determining the content of the terpene compounds in the health care wine. After nitrogen blowing concentration, a gas chromatograph-mass spectrometer is matched with polar and non-polar chromatographic columns to measure the sample. According to the method, interference of irrelevant matrixes is reduced, pollution to a chromatographic column and a detector is reduced, the extraction efficiency of the mixed extraction agent on a target compound is improved, volatile components in a wine sample can be effectively extracted only with a small amount of organic solvent, the use amount of the organic solvent is greatly reduced, and the cost is reduced. Compared with the prior art, the method has the advantages that the cost is reduced, the pollution to the environment is reduced, the response value of a target compound is improved, the detection range is expanded, the method has the advantages of less interference, low detection limit, high response value, wide detection range and high accuracy, and the detection limit is 0.1387 mu g / L to 1.9695 mu g / L.

The invention provides UPLC-MS (Ultra Performance Liquid Chromatography-Mass Spectrometry) chemical components of Zhuang medicine embelia parviflora and a fingerprint spectrum analysis method thereof, and belongs to the technical field of medicine analysis. The method comprises the following steps: step 1, setting detection conditions of a quadrupole electrostatic field orbitrap high-resolution mass spectrometry method; 2, setting fingerprint conditions; 3, chemical component identification result analysis; and 4, establishing the UPLC fingerprint chromatography of the embelia parviflora. According to the method, chemical components of embelia parviflora are analyzed by adopting a UPLC-Q-Exactive HRMS (High Resolution Mass Spectrometry-Quantitative Exactive High Resolution Mass Spectrometry) technology, and in consideration of serious interference of ion fragments, a spectrum library matching result can be seriously influenced, and the deduction of a mass spectrum splitting decomposition process can be interfered, so that only 10 components with the matching degree being greater than 85% are screened in an experiment, and the deduction of the mass spectrum splitting decomposition process is carried out.

The invention provides a method for detecting N-nitrosomeropenem as an impurity in meropenem, and belongs to the field of pharmaceutical analytical chemistry. According to the detection method, an LC-MS method is adopted, and the chromatographic conditions are as follows: a Waters Atlants HILIC Silica liquid chromatographic column (150mm * 4.6 mm, 5 [mu] m) is adopted as a chromatographic column; a mobile phase A is ammonia water with the volume concentration of 0.04%-0.06%, and a mobile phase B is formic acid acetonitrile with the volume concentration of 0.05%-0.2%; and gradient elution. According to the method, the N-nitrosomeropenem impurity and meropenem can be effectively separated, the meropenem impurity N-nitrosomeropenem can be effectively detected, and the method is high in specificity and applicability, high in detection sensitivity, good in linear relation and high in precision and accuracy.

The invention relates to the technical field of medicine quality detection methods, in particular to a method for detecting fluorine impurities in a mosapride citrate intermediate. The detection method comprises the following steps: a test solution containing 2-aminomethyl-4-(4-fluorobenzyl)-morpholine is detected by liquid chromatography, and a mobile phase is a monopotassium phosphate-phosphoric acid-acetonitrile buffer solution. The detection method provided by the invention has good separation degree, high response value and good sensitivity on related substances, can realize separation of the four fluorine impurities, and effectively controls the related substances of the intermediate 2-aminomethyl-4-(4-fluorobenzyl)-morpholine, so that the product quality of mosapride citrate can be effectively ensured, and the detection method is suitable for industrial production. Meanwhile, the subsequent impurity removal treatment process can be simplified, and the use amount of an impurity removal separation solvent is further reduced.

This invention discloses a method and application for in-situ growth of Ti3C2Tx-titanium dioxide heterostructure material, belonging to the field of two-dimensional composite materials and gas sensor technology. The invention uses a hydrochloric acid solution containing fluorine compounds as the etching solvent and employs a hydrothermal method to etch Ti3AlC2 to prepare Ti3C2Tx material (Tx = -F, -OH, and -O). The Ti3C2Tx material is then subjected to oxygen microwave plasma treatment at low power, while controlling the oxygen volume fraction to 10-30%. This partially oxidizes the Ti3C2Tx material into two-dimensional sheet-like TiO2 oxides. These two-dimensional sheet-like TiO2 oxides tightly coat the surface of Ti3C2Tx, forming a Ti3C2Tx-TiO2 heterostructure material. Gas sensors prepared using this Ti3C2Tx-TiO2 heterostructure material exhibit excellent responsiveness and selectivity to hydrogen.

The invention relates to a preparation method of a three-dimensional multi-channel gas sensor for H2S gas detection, an Ag-doped WO3 material is prepared by a hydrothermal method, and the prepared Ag-coated WO3 is in a three-dimensional nanoflower shape self-assembled by nanosheets. According to the three-dimensional hierarchical structure, the high sensitivity of the sensitive layer to H2S gas can be promoted by the electronic and chemical sensitization effects of noble metal Ag and the sulfuration reaction of Ag and H2S, rapid response, high-sensitivity and high-selectivity detection of H2S gas can be realized at room temperature, and the practical application in atmospheric pollution detection is met.