35results about How to "High sensitivity response" patented technology

The invented optical-fibre grating vibration sensor is characterized by that it utilizes a demodutation grating and a sensing grating and makes them be series-connected together, and respectively makes them be stuck on a main beam and an auxiliary beam, two beams are made of identical material and have identical heat expansion coefficient, so that their central wavelengths can be synchronously shifted with temperature, therefore they have automatic temperature compensation function so as to implement matching filter demodutation. Said invention utilizes the detection of light intensity change of sensing grating reflecting light to monitor the parameters of vibration frequency and vibration amplitude of monitored body, finally utilizes computer or single-chip computer to make analysis and processing of body vibration frequency spectrum.

The invention relates to a method for preparing flake porous ZnO nano powder, which comprises the following steps: adding ammonia into solution of zinc nitrate dropwise, and adjusting the pH of the solution to between 6 and 8; under the condition of stirring by magnetic force at the rotating speed of 0 to 180r / m, performing reaction at the temperature of between 0 and 80DEG C for 0.5 to 3 hours; separating, washing and drying the obtained cloudy solution to obtain a crosslinked flake and dispersed flake basic zinc nitrate precursor; and calcinating the basic zinc nitrate precursor with the two appearances at the temperature of between 220 and 500DEG C for 0.5 and 3 hours to obtain the flake porous ZnO nano powder. The nano ZnO product prepared by the method is white powder, belongs to a hexagonal system, has large specific surface area, high purity and good product quality, and responds to gas such as ethanol and acetone sensitively.

The invention relates to a preparation method of a graphite oxide phase carbon nitride modified electrode. The preparation method comprises the following steps: (1) preparing graphite oxide phase carbon nitride; and (2) preparing a graphite oxide phase carbon nitride sensor. The electrode is applied to detecting heavy metal ions. Graphite oxide phase carbon is of a three-dimensional hole structure which is large in specific surface area and contains hydrophilic groups such as hydroxyl, carboxyl, and epoxy groups. The graphite oxide phase carbon is applied to an electrochemical sensor. The heavy metal ions Cu<2+> are detected by virtue of a different pulse stripping voltammetry, and influence of factors such as enriching time, enriching potential, the pH value of a solution, and modification amount on stripping peak current can be optimized. Under an experimental condition that the enriching time is 300s, the enriching potential is -0.6V, the pH value of the solution is 4.68 and the modification amount is 12 microliters, a standard curve represents a good linear relationship, wherein the linear range is (1.60*10<-15>-6.31*10<-15>mol / L, the linear equation is ip(microA)=1.2533C(micro mol / L)+6.2232, the correlation coefficient (R) is 0.9989, and the limit of detection (S / N=3) reaches 1*10<-16>mol / l. The electrode has ultrahigh sensitivity to heavy metal ion detection.

The invention discloses a preparation method of porous nickel oxide / tin dioxide micro / nano spheres, which comprises the following steps: stirring tin tetrachloride pentahydrate, nickel sulfate hexahydrate, sodium hydroxide and ammonia water which are used as raw materials, heating, separating, washing, drying and the like to obtain micro / nano spherical hydroxy nickel stannate; and roasting a micro / nano spherical NiSn(OH)6 precursor at high temperature, and cooling to respectively obtain porous micro / nano spherical NiO / SnO2 powder. The micro / nano spherical NiO / SnO2 product prepared by the method disclosed by the invention is light green powder, and has the advantages of large specific area and good product quality. The impedance gas sensing element prepared from the micro / nano spherical NiO / SnO2 powder has high sensitivity, and the sensitivity S value for 100ppm methylbenzene and formaldehyde gases is respectively up to 19.8 and 27.6.

The invention provides a method for preparing a hydrogen sensitive element based on a quadrature-phase molybdenum oxide nano-belt. The method comprises the following steps: A, a quadrature-phase molybdenum oxide nano-belt powder by a hydrothermal method; B, preparing an interdigital electrode by a photolithographic mask method; and C assembling a hydrogen sensitive element, namely molybdenum oxide powder and an absolute ethyl alcohol mixed liquid, carrying out ultrasonic treatment, dropwise adding the mixed liquid into the center position of the interdigital electrode, and annealing. According to the method, Na2MoO4.2H20 is used as a raw material, the quadrature-phase molybdenum oxide nano-belt with uniform appearance is prepared by adopting the simple hydrothermal method, the using process is simple, the preparation cycle is short, the sample yield is high, and the cost is low; the nano-belt dispersed by ultrasonics is coated to the interdigital electrode to obtain the hydrogen sensitive element with excellent performance; at room temperature, the element has the characteristics of high sensitivity and quick response on low-concentration hydrogen, has excellent repeatability and selectivity on hydrogen, and can meet the requirement of quickly detecting low-concentration hydrogen.

The invention relates to a preparation method of an alpha-oxoglutarate fluorescent / ultraviolet molecular probe and application of the alpha-oxoglutarate fluorescent / ultraviolet molecular probe to biological samples. The preparation method includes the steps that NBD-Cl is dissolved in chloroform, the dissolution concentration is 0002-0.012 g / ml, then a hydrazine hydrate-methanol solution with the volume concentration being 0.2-1.2% is added in and uniformly mixed, brown precipitate is obtained through stirring at room temperature and filtered, a filter cake is washed through ethyl acetate and dried, and the brown product alpha-oxoglutarate fluorescent / ultraviolet molecular probe is obtained. The alpha-oxoglutarate fluorescent / ultraviolet molecular probe is applicable to qualitatively and quantitatively analyzing alpha-oxoglutarate in the biological samples, and detection is sensitive, accurate and fast. The biological samples mainly comprise serum, living cells, muscle tissue and the like. The alpha-oxoglutarate fluorescent / ultraviolet molecular probe can be applied to analytical chemistry, life organic analysis, disease pre-diagnosis, medical clinical inspection and other related fields. The alpha-oxoglutarate fluorescent / ultraviolet molecular probe has the advantages of being good in response performance and high in data accuracy, repeatability and precision, equipment is convenient, fast and easy to operate, operability is high, and the alpha-oxoglutarate fluorescent / ultraviolet molecular probe is particularly suitable for large-batch sample combined screening and other large-data research.

The invention provides a ratio-type fluorescence probe for detecting alanine aminopeptidase as well as a preparation method and application thereof. The fluorescence probe is a compound shown as a formula I. The fluorescence probe disclosed by the invention can be applied to detecting and imaging of the alanine aminopeptidase in a biological sample. The probe serves as a specific probe of the alanine aminopeptidase, alanine in the probe can be removed by hydrolysis under the condition of the presence of the alanine aminopeptidase only, a fluorescent substance with a novel fluorescence signal is generated, the fluorescence signal can be enhanced and can also have ratio change, and the alanine aminopeptidase can be measured and imaged. The structural formula is as shown in the specification.

The present invention relates to a preparation method and an application of a dual-response fluorescent molecular probe for detecting ClO<-> / H2S based on hydrogen ion activation. The method comprises the steps of dissolving NBD-Cl in chloroform, adding a hydrazine hydrate-methanol solution, and performing uniform mixing to obtain a product 1; dissolving the product 1 in ethanol, adding benzaldehyde and glacial acetic acid, and conducting refluxing, cooling, precipitation, etc. to obtain the final product. The fluorescent molecular probe is applicable to qualitative analysis and quantitative analysis of ClO<-> / H2S in biological samples, and detection is sensitive, accurate and fast; the biological samples mainly include gastric juice, gastric mucosa, cells, and so on. The fluorescent molecular probe can be used in the related fields of analytical chemistry, life organic analysis, disease pre-diagnosis and clinical examination.

The invention discloses a temperature-sensitive-type terahertz detector based on phase change material and a preparation method. The detector is composed of an alumina substrate, an indium antimonide-sensitive element, a vanadium dioxide grating structure layer, a half-wave antenna and a device socket. According to the temperature-sensitive-type terahertz detector prepared according to the invention, the vanadium dioxide grating structure layer is introduced on the basis of a traditional metal-semiconductor-metal structure, the phase change transition characteristic of vanadium dioxide at an ambient temperature of 68 DEG C is used, thus a drastic change of conductivity of the grating structure layer is caused, then field enhancement effects caused by local plasmons of the whole device areenabled to be different, and a modulation purpose of terahertz wave detection is achieved; and a new function of sensing the ambient temperature is added while fast highly-sensitive response of a widewave band of 0.01- 3THZ is realized. The detector has very important significance for both device structure design optimization and device function perfection, and can play important roles in the fields of science, technology and the like.

The invention discloses an application of a two-dimensional palladium selenide nano film for detection of broadband polarized light signals. The application is characterized in that the two-dimensional palladium selenide nano film is taken as a light sensitive layer to make a polarization-sensitive photoelectric detector, and detection of the broadband polarized light signals is realized. The application is advantaged in that the polarization-sensitive photoelectric detector made based on the two-dimensional palladium selenide nano film has significant response to the polarized light signals,and thereby accurate and stable detection of the wavelength-covered ultraviolet, visible and infrared polarized light signals in the complex electromagnetic environment can be performed.

The invention belongs to the photonics device field and relates to a supporting column-supported echo wall mode photonics device, a preparation method thereof and the use of the device. In particular,the present invention provides a supporting column-supported micro disk. The supporting column of the supporting column-supported micro disk comprises a first electron beam resist; the micro disk comprises a second electron beam resist; and the molecular weight of the first electron beam resist is lower than that of the second electron beam resist. The supporting column-supported micro disk, a micro disk array structure, an echo wall mode optical resonant micro-cavity and a photonics device of the invention have the advantages of simple preparation process, convenient operation and low cost,and can be prepared on a large scale, have high quality factors and spectral modulation functions. With the preparation method adopted, a problem that a substrate needs to be separately etched in a traditional high-quality micro-cavity preparation process can be solved; and the coupling effect of a plurality of micro-cavities can be realized. The method has high practicability, and is especially suitable for the design and application of photonics integrated components.

The invention discloses zinc tungstate / zinc oxide heterogeneous nanofiber as well as a preparation method and application thereof. The preparation method comprises the steps that the molar weight of zinc nitrate is fixed in an electrostatic spinning precursor solution, the molar weight of phosphotungstic acid is regulated and controlled, the precursor solution is mixed and stirred to be uniform, then electrostatic spinning is conducted, and calcination is conducted in air, so that the zinc tungstate / zinc oxide heterogeneous nanofiber synthesized with the assistance of polyoxometallate is obtained. The one-dimensional heterogeneous nanofiber is composed of zinc tungstate and zinc oxide compounded with the zinc tungstate, and has an n-n type heterogeneous nanofiber structure. When the heterogeneous nanofiber is used as a gas sensitive sensor, a gas sensitive test result shows that the gas sensitive sensor has the characteristic of high-sensitivity quick response to triethylamine. In combination with excellent electron transfer performance and large specific surface area of the zinc tungstate / zinc oxide heterogeneous nanofiber, the gas sensitive sensor can realize high-selectivity, high-sensitivity and long-term stable detection of the triethylamine.

The invention discloses a licker-in micro-current leveling device of an automatic cotton carding machine. The device comprises an independent motor and a micro-current inductor; the independent motoris installed on the automatic cotton carding machine, any power supply line of the independent motor is connected with the input end of the micro-current inductor, the output end of the micro-currentinductor is connected with the input end of a main control board, the input end of the main control board is connected with the input end of a frequency converter, and the output end of the frequencyconverter is connected with the input end of a speed reduction motor of a cotton feed roller. The cotton supply roller can directly enter the licker-in through the cotton feed procedure, the licker-incan directly send cotton feed changes, and therefore the cotton feed roller speed can be accurately adjusted in time.

The invention discloses a preparation method of porous nano tin dioxide. The method comprises the following steps: firstly, carrying out steps such as stirring, heating, separating, washing and drying on tin tetrachloride pentahydrate, sodium hydroxide and copper chloride dehydrate which are used as raw materials, so as to obtain a nano rod and micron cube-shaped hydroxyl copper stannate; and roasting CuSn(OH)6 precursors with two morphologies at high temperature and carrying out acidic washing after cooling, so as to respectively obtain a porous nano rod and micron cube-shaped SnO2 nano powder. The porous nano rod and micron cube-shaped SnO2 nano powder products prepared by the method are while powder, and are large in specific surface area and good in product quality. A resistive air-sensitive sensing element made of the SnO2 nano powder prepared by the method is high in sensitivity, and the sensitivity S value of the element on 100ppm toluene gas is up to 18.2.

The invention relates to a preparation method of an alpha-oxoglutarate fluorescent / ultraviolet molecular probe and application of the alpha-oxoglutarate fluorescent / ultraviolet molecular probe to biological samples. The preparation method includes the steps that NBD-Cl is dissolved in chloroform, the dissolution concentration is 0002-0.012 g / ml, then a hydrazine hydrate-methanol solution with the volume concentration being 0.2-1.2% is added in and uniformly mixed, brown precipitate is obtained through stirring at room temperature and filtered, a filter cake is washed through ethyl acetate and dried, and the brown product alpha-oxoglutarate fluorescent / ultraviolet molecular probe is obtained. The alpha-oxoglutarate fluorescent / ultraviolet molecular probe is applicable to qualitatively and quantitatively analyzing alpha-oxoglutarate in the biological samples, and detection is sensitive, accurate and fast. The biological samples mainly comprise serum, living cells, muscle tissue and the like. The alpha-oxoglutarate fluorescent / ultraviolet molecular probe can be applied to analytical chemistry, life organic analysis, disease pre-diagnosis, medical clinical inspection and other related fields. The alpha-oxoglutarate fluorescent / ultraviolet molecular probe has the advantages of being good in response performance and high in data accuracy, repeatability and precision, equipment is convenient, fast and easy to operate, operability is high, and the alpha-oxoglutarate fluorescent / ultraviolet molecular probe is particularly suitable for large-batch sample combined screening and other large-data research.

Belonging to the technical field of inorganic material synthesis and application, the invention provides preparation and application of N-(2-hydroxy-5-chlorobenzene)ylrhodamine B hydrazide. The invention adopts liquid-phase synthesis method. The method includes: firstly adding excess hydrazine hydrate into a rhodamine B ethanol solution, carrying out heating reflux reaction to obtain an initial product, then employing concentrated hydrochloric acid and a sodium hydroxide solution respectively to adjust the reaction system to neutral, thus obtaining a reduced intermediate product rhodamine B hydrazine; then further reacting the rhodamine B hydrazine with 5-chlorosalicylaldehyde in methanol, and conducting recrystallization to obtain N-(2-hydroxy-5-chlorobenzene)ylrhodamine B hydrazide for rapid, sensitive and highly selective recognition or even trace detection of zinc ions. The compound has the advantages of simple synthesis process, mild reaction conditions, small reagent dosage, lowmaking cost, little environmental pollution, and good optical properties and biocompatibility, and can be developed as a brand new fluorescent probe for zinc ion recognition in organisms.

The invention provides preparation method for a graphene-modified visible abrasion-resistant coating. The method comprises the steps that firstly, a certain amount of strontium carbonate (SrCO3), aluminum oxide (Al2O3) and a certain amount of ethyl alcohol are weighed and mixed; secondly, a certain amount of graphene oxide is weighed and dispersed in absolute ethyl alcohol to be subjected to ultrasonic concussion; thirdly, europium oxide (Eu2O3) and dysprosium oxide (Dy2O3) are dissolved with diluted hydrochloric acid; fourthly, modification and composition regulation of Dy3+ / Eu3+ are achieved through graphene; fifthly, graphene-modified SrAl2O4:Eu3+, Dy3+ powder with the powder particle size being 1-3 microns is obtained through screening; and sixthly, a graphene codoped Dy3+ / Eu3+ WC-Co powder material with a certain grain is obtained, and the graphene-modified SrAl2O4:Eu3+, Dy3+ codoped WC-Co visible abrasion-resistant coating is prepared through a thermal spraying technology. By adopting the technical scheme, the spray material is even in grain and high in purity, the graphene content in powder is high, and the visual abrasion-resistant coating can be prepared through the thermal spraying technology.

The invention provides a zigbee-based wireless slip ring device and a nucleic acid detection method thereof. The zigbee-based wireless slip ring device comprises a dynamic sending platform, a power driving mechanism and a static receiving platform, a longitudinal and transverse servo motor and a system receiving plate are arranged on the static receiving platform, and the bottom of the static receiving platform is connected with a driving lifting assembly and a driven telescopic arm; and a triangular supporting frame is arranged at the bottom of the active lifting assembly, the dynamic sending platform is connected to the lower portion of the triangular supporting frame and provided with a lithium battery and a system sending plate, and a fluorescent quantitative PCR amplification instrument is installed on the bottom face of the dynamic platform and comprises exposed probes, a built-in fluorescent lamp, a photoelectric conversion module and a thermoelectric cooler. The zigbee-based wireless slip ring device has the beneficial effects that in the process of transmitting digital and analog signals of the dynamic platform to the static platform, a motor drives master and slave arms and linkages a holding and clamping device to keep the telescopic range, the problems that wiring cannot be conducted on an automatic intelligent slip ring device for the cold-chain food and signals at certain distances are interconnected are solved, and the effects that when the signals are not delayed, the data transmission is fast is achieved.

The invention relates to a method for preparing flake porous ZnO nano powder, which comprises the following steps: adding ammonia into solution of zinc nitrate dropwise, and adjusting the pH of the solution to between 6 and 8; under the condition of stirring by magnetic force at the rotating speed of 0 to 180r / m, performing reaction at the temperature of between 0 and 80DEG C for 0.5 to 3 hours; separating, washing and drying the obtained cloudy solution to obtain a crosslinked flake and dispersed flake basic zinc nitrate precursor; and calcinating the basic zinc nitrate precursor with the two appearances at the temperature of between 220 and 500DEG C for 0.5 and 3 hours to obtain the flake porous ZnO nano powder. The nano ZnO product prepared by the method is white powder, belongs to a hexagonal system, has large specific surface area, high purity and good product quality, and responds to gas such as ethanol and acetone sensitively.

The invention discloses a G-quadruplex fluorescent dye based on the G-quadruplex structure of the highly conserved region of the HCV genome, the structure of which is shown in formula (I). Based on the topological structure of the functional nucleic acid in the highly conserved region of the HCV genome, that is, the G-quadruplex structure, the present invention proposes a novel HCV detection idea, that is, the synthesized novel G-quadruplex dye can quickly enter cells and interact with cells The G-quadruplex structure in the HCV genome specifically binds to generate a highly sensitive fluorescent signal, and realizes the detection of HCV infection in living cells.

The invention discloses a receiving transducer with adjustable working frequency which comprises a plurality of coupled Helmholtz resonant cavity structure units which are arranged together. Each coupling Helmholtz resonant cavity structure unit comprises a thin-wall circular tube extension neck, a piezoelectric material and two coupled Helmholtz resonant cavities. Each Helmholtz resonant cavity comprises a perforated top wall, a non-perforated bottom wall, a side wall, a front panel and a rear panel. Each side wall is located between the two coupled Helmholtz resonant cavity structure units,and each front panel and each rear panel are used for forming a closed cavity; openings in the top walls of the two Helmholtz resonant cavities are the same or different in size, thin-wall circular tube extension necks are arranged in the openings in the top walls in a penetrating mode, piezoelectric materials are arranged between the two Helmholtz resonant cavities, and the piezoelectric materials are formed by pressing piezoelectric ceramic pieces and electrode pieces. The whole structure and the manufacturing process are simple, array processing is easy to achieve to improve the sensitivity, series-parallel connection processing can be conducted according to needs, and the cost is low.

The present invention relates to a preparation method and an application of a dual-response fluorescent molecular probe for detecting ClO<-> / H2S based on hydrogen ion activation. The method comprises the steps of dissolving NBD-Cl in chloroform, adding a hydrazine hydrate-methanol solution, and performing uniform mixing to obtain a product 1; dissolving the product 1 in ethanol, adding benzaldehyde and glacial acetic acid, and conducting refluxing, cooling, precipitation, etc. to obtain the final product. The fluorescent molecular probe is applicable to qualitative analysis and quantitative analysis of ClO<-> / H2S in biological samples, and detection is sensitive, accurate and fast; the biological samples mainly include gastric juice, gastric mucosa, cells, and so on. The fluorescent molecular probe can be used in the related fields of analytical chemistry, life organic analysis, disease pre-diagnosis and clinical examination.

The invention discloses preparation and application of 6-chloro-3-[(2-hydroxy-4-diethylin benzylidene)amino]coumarin, and belongs to the technical fields of inorganic material synthesis and application. The 6-chloro-3-[(2-hydroxy-4-diethylin benzylidene)amino]coumarin is prepared by firstly synthesizing 3-amino-6-chlorocoumarin from 5-chloro salicylaldehyde, acetoglycocoll and anhydrous sodium acetate, and then reacting with 4-diethylin salicylaldehyde. The 6-chloro-3-[(2-hydroxy-4-diethylin benzylidene)amino]coumarin synthesized in the invention is a novel cobalt ions colorimetric recognition molecular probe, and is stable in structure, simple in preparation method, mild in reaction conditions, green, non-pollution and high in yield; and moreover, the 6-chloro-3-[(2-hydroxy-4-diethylin benzylidene)amino]coumarin has a good naked eye recognition effect for cobalt ions, is high in sensitivity and high in special selectivity, can be used for trace detection of cobalt ions, and is an ion colorimetric sensing material with important application values.

The invention discloses a receiving transducer with adjustable working frequency, which comprises a plurality of coupled Helmholtz resonant cavity structural units arranged together, and the coupled Helmholtz resonant cavity structural unit includes a thin-walled circular tube extension neck, A piezoelectric material and two coupled Helmholtz resonant cavities, the Helmholtz resonant cavity includes a top wall with openings, a bottom wall without openings, side walls, and a front panel and a rear panel, the The side wall is located between the two coupled Helmholtz resonant cavity structural units, and the front panel and the rear panel are used to form a closed cavity; the openings of the top walls of the two Helmholtz resonant cavities have the same or different sizes, In addition, an extension neck of a thin-walled circular tube is interspersed in the opening of the top wall, and a piezoelectric material is arranged between the two Helmholtz resonant cavities, and the piezoelectric material is formed by pressing piezoelectric ceramic sheets and electrode sheets. The overall structure and manufacturing process of the present invention are simple, easy to be processed in an array to improve sensitivity, and can also be processed in series and parallel according to needs, and the cost is low.

The invention discloses an anti-dispersion structure of an electron multiplying charge-coupled device(EMCCD). According to the structure, an anti-dispersion channel is arranged in an imaging unit in an imaging area of the EMCCD; signal channels in the imaging unit in the imaging area of the EMCCD are arranged on two sides of the anti-dispersion channel. Excess photon-generated carriers generated due to glare irradiation or relatively over long light integrating time overflow to the anti-dispersion channel, and are converted into current to be released through the anti-dispersion channel, so as to inhibit dispersion phenomenon. According to the anti-dispersion structure, not only a low-light level imaging system based on the EMCCD has higher response sensitivity, but also the dynamic range of the low-light level imaging system taking the image sensor of the EMCCD as a core device is greatly broadened.

Belonging to the technical field of gas sensitive devices, the invention relates to a Y type zeolite ammonia gas sensor based on Li<+> or La<3+> ion exchange, and the Y type zeolite ammonia gas sensor is applicable to but not limited to concentration detection of ammonia gas in a selective catalytic reduction (SCR) system. The Y type zeolite ammonia gas sensor is prepared by soaking a zeolite-based sensor in a solution and subjecting the sensor to exchange on a shaking table for 10-20h. The solution is lithium chloride solution or lanthanum nitrate solution. And the concentration of the lithium chloride solution and the lanthanum nitrate solution is 0.05-0.2mol / L. The Y type zeolite ammonia gas sensor based on Li<+> or La<3+> ion exchange provided by the invention has the characteristics of high sensitivity response, low working temperature, low power consumption, and stable and reliable performance, and the preparation technology and application of the sensor are very simple.

The invention belongs to the photonics device field and relates to a supporting column-supported echo wall mode photonics device, a preparation method thereof and the use of the device. In particular,the present invention provides a supporting column-supported micro disk. The supporting column of the supporting column-supported micro disk comprises a first electron beam resist; the micro disk comprises a second electron beam resist; and the molecular weight of the first electron beam resist is lower than that of the second electron beam resist. The supporting column-supported micro disk, a micro disk array structure, an echo wall mode optical resonant micro-cavity and a photonics device of the invention have the advantages of simple preparation process, convenient operation and low cost,and can be prepared on a large scale, have high quality factors and spectral modulation functions. With the preparation method adopted, a problem that a substrate needs to be separately etched in a traditional high-quality micro-cavity preparation process can be solved; and the coupling effect of a plurality of micro-cavities can be realized. The method has high practicability, and is especially suitable for the design and application of photonics integrated components.

The invention provides a method for preparing a hydrogen sensitive element based on a quadrature-phase molybdenum oxide nano-belt. The method comprises the following steps: A, a quadrature-phase molybdenum oxide nano-belt powder by a hydrothermal method; B, preparing an interdigital electrode by a photolithographic mask method; and C assembling a hydrogen sensitive element, namely molybdenum oxide powder and an absolute ethyl alcohol mixed liquid, carrying out ultrasonic treatment, dropwise adding the mixed liquid into the center position of the interdigital electrode, and annealing. According to the method, Na2MoO4.2H20 is used as a raw material, the quadrature-phase molybdenum oxide nano-belt with uniform appearance is prepared by adopting the simple hydrothermal method, the using process is simple, the preparation cycle is short, the sample yield is high, and the cost is low; the nano-belt dispersed by ultrasonics is coated to the interdigital electrode to obtain the hydrogen sensitive element with excellent performance; at room temperature, the element has the characteristics of high sensitivity and quick response on low-concentration hydrogen, has excellent repeatability and selectivity on hydrogen, and can meet the requirement of quickly detecting low-concentration hydrogen.