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

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 electrochemical sensor based on hierarchical porous Cu‑BTC material and its application in the detection of pesticide glyphosate involves the preparation technology of electrochemical sensor materials, and the hierarchical porous Cu‑BTC material and perfluorosulfonic acid are sequentially modified in oxidation Indium tin conductive glass surface for electrochemical sensors based on hierarchically porous Cu‑BTC materials. The electrochemical sensor is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a platinum wire electrode is used as a counter electrode to form a three-electrode system, which can accurately detect the content of glyphosate in the liquid to be measured. Through the test, the results show that the sensitivity of the electrode to glyphosate detection is significantly improved, and the modified electrode is easy to prepare, has good reproducibility and stability, and a wide linear range, and can detect the content of glyphosate in the actual sample. Fast, high accuracy and other advantages.

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 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 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 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.