31results about How to "Excellent fluorescence performance" patented technology

The invention relates to a preparation method of a zeolite imidazole frame-8 double-site loaded carbon dot and gold or gold and silver nanocluster fluorescent material, which comprises the following steps of: 1, uniformly mixing a HAuCl4 aqueous solution and a GSH aqueous solution at room temperature, or uniformly mixing an AgNO3 aqueous solution, the HAuCl4 aqueous solution and the GSH aqueous solution, then stirring for 20-28 hours at 60-80 DEG C, cooling to room temperature, adding methanol, centrifuging, and drying to obtain a precursor solution of the zeolite imidazole frame-8 double-site loaded carbon dot and gold or gold and silver nanocluster; washing and drying to obtain gold or gold-silver nanoclusters, and dispersing the gold or gold-silver nanoclusters in water for later use; step 2, preparing carbon dots CDs; 3, zinc nitrate hexahydrate and 2-methylimidazole are added into methanol containing CDs under the stirring condition to react for 20-28 hours, centrifugation and washing are conducted, and a product ZIF coated CDs is obtained; and 4, mixing the gold or gold and silver nanocluster solution with the ZIF-coated CDs under an ultrasonic condition at room temperature to obtain the ZIF-coated CDs / gold / silver nanocluster composite material. The invention also provides an application of the zeolite imidazole frame-8 double-site loaded carbon dot and gold and silver nanocluster fluorescent material in detection of pesticide triazophos (TZP) and glucose.

The invention discloses a preparation method of boric acid-modified AIE nanoparticles and their application in rapid detection and efficient killing of Staphylococcus aureus. The invention belongs to the technical field of food safety immunoassay and photocatalytic sterilization, and specifically relates to a method for rapid detection and efficient killing of Staphylococcus aureus based on aggregation-induced luminescence materials. The purpose of the invention is to solve the problems that the existing fluorescent immunoassay method is prone to partial or complete quenching when detecting bacteria, which limits its application, and the traditional organic photosensitizers are limited by their planar rigid π-conjugated structure and poor water solubility, which lead to aggregation fluorescence quenching and insufficient ROS production, which limits their application. A boric acid-modified AIE nanoparticle is used in the rapid detection of Staphylococcus aureus. A boric acid-modified AIE nanoparticle is used in the efficient killing of Staphylococcus aureus. The invention proposes a multifunctional integrated platform that can not only provide early warning of the presence of bacteria, but also avoid the massive reproduction of bacteria.

The invention belongs to the field of polyester materials, and relates to a high-temperature-resistant polyarylester fluorescent film and a preparation method thereof. The preparation method comprises the following steps: carrying out esterification reaction on a reaction monomer under the conditions of a catalyst and a stabilizer, firstly mixing and stirring bisphenol fluorene, 18-crown ether-6 and deionized water to prepare a precursor solution, then gradually dropwise adding part of a paraphthaloyl chloride solution, continuously reacting for 3 hours under an alkaline condition, then adding an aqueous solution of bisphenol A into the solution, continuously reacting for 3 hours under an alkaline condition, and carrying out vacuum drying, so as to obtain the bisphenol fluorene / 18-crown ether-6 composite material. And continuously dropwise adding the residual paraphthaloyl chloride solution, reacting for 5 hours, adjusting the pH value of the mixed solution to be acidic, finally crushing, suction-filtering, precipitating and drying the product, and dissolving the product in an N-methyl pyrrolidone solution to prepare the film. The film prepared by the method has better high-temperature resistance, can emit blue fluorescence under the excitation of ultraviolet light, and can be used as a new optical material to be applied to the anti-counterfeiting field.

The present application mainly relates to a kind of preparation of sulfur-rich amino acid protein CMd-copper nanoclusters and its detection mercury ion method, comprising: a) by prokaryotic expression obtains CMd protein, and the protein concentration of 5 mg / mL-25 mg / mL CMd protein solution is obtained by purification.b) CMd is reacted with reducing agent TCEP after opening protein disulfide bond.c) the protein solution after reduction is reacted with anhydrous copper sulfate, and preparation high fluorescence CMd-copper nanocluster.d) CMd-copper nanocluster is applied to detect heavy metal mercury ion.The application method can be synthesized under mild aqueous conditions by "one-step method" structure controllable, stable CMd-copper nanocluster, widens the raw material of copper nanocluster synthesized with protein as template, avoids the use of organic solvent and strong reducing agent, and reduces the cost and environmental burden brought by noble metal raw material, and also has higher selectivity to mercury ion.

The invention discloses a composite coating material for repairing the inner diameter corrosion surface of a hydraulic cylinder and a preparation method of the composite coating material, belongs to the field of metal anti-corrosion coatings, can effectively solve the problems that the inner diameter of the hydraulic cylinder is corroded, a matched sealing ring is seriously abraded and the like, and has the advantages that thermal stress is not introduced, the repairing efficiency is high and the accessibility is good. A corrosion inhibitor is stably combined on the surface of a porous polyether-ether-ketone nano-particle material by adopting a layer-by-layer self-assembly method to obtain polyether-ether-ketone nano-particles loaded with the corrosion inhibitor, and then the polyether-ether-ketone nano-particles loaded with the corrosion inhibitor are mixed with epoxy resin to obtain a uniform and stable modified epoxy resin anticorrosive coating. The obtained modified epoxy resin coating has excellent mechanical performance, corrosion resistance and machinability, can effectively inhibit the corrosion of the inner diameter of the cylinder body, maintains the dimensional precision and surface quality of the inner diameter of the cylinder body through machining, meets the service requirements of cylinder body parts, is simple and rapid in repairing process, can effectively repair damage caused by corrosion, and has a good application prospect. And the maintenance time and cost are reduced.

The invention relates to the field of fluorescent nanomaterials, and in particular to a fluorescent probe for detecting gatifloxacin and an application thereof in food. The invention uses bear bile powder as a precursor to prepare a novel biomatrix-derived carbon quantum dot, and constructs a highly selective fluorescent sensing platform, which is successfully used to detect gatifloxacin in milk and honey. The prepared carbon quantum dots show obvious concentration dependence. Under sunlight, as the concentration of the carbon quantum dots increases, the color of the solution gradually changes from light yellow to orange-yellow, and under ultraviolet light, it shows a transition from blue fluorescence to green fluorescence. By establishing a linear relationship between the fluorescence signal intensity and the gatifloxacin concentration, sensitive detection of gatifloxacin is achieved, and the detection limit can be as low as 3 μg / L, which proves the excellent performance of the fluorescent probe and provides a certain reference value for the application of biomatrix-derived carbon quantum dots in the field of food safety detection.

The invention provides a gold-copper nanocluster with efficient multi-source active oxygen generation performance and a preparation method and application of the gold-copper nanocluster, and belongs to the field of biomedical materials. The gold-copper nanocluster is synthesized through mediation of Tf, and Tf is full transferrin, iron-saturated transferrin or siderophore. The gold-copper nanocluster with Tf as the ligand is synthesized by adopting a simple one-pot method, and the problems that in the prior art, a multi-source active oxygen generation system is complex to construct and a preparation method is tedious are solved; the gold-copper nanocluster synthesized by taking Tf as a ligand can be used as a simple multi-source active oxygen generation system, superoxide anions can be generated through photosensitized oxidation activity sensitization oxygen, and hydroxyl radicals can be generated through peroxidase-like activity catalysis hydrogen peroxide, so that efficient generation of multi-source active oxygen is realized; and the effect of enhancing tumor treatment is achieved.

The invention discloses a method for preparing a rare earth doped nanocomposite material, wherein the composite material is assembled from a nano noble metal bowl-shaped array and rare earth upconversion nanoparticles. The localized plasma resonance absorption peak of the nano noble metal bowl-shaped array matches the emission peak of the corresponding rare earth upconversion nanoparticles. In the hot spot in the nano noble metal bowl, under the irradiation of excitation light, the luminescence of the rare earth upconversion nanoparticles will be greatly enhanced.

The invention discloses a multi-stimulus responsive fluorescent color-changing material as well as a preparation method and application thereof, and belongs to the technical field of fluorescent color-changing materials. The substance composition of the multi-stimulus responsive fluorescent color-changing material disclosed by the invention is a maleimide-isopropylacrylamide copolymer. According to the multi-stimulus responsive fluorescent color-changing material, through copolymerization of carboxylic acid maleimide and isopropylacrylamide, a synergistic effect is formed between carboxylic acid maleimide and isopropylacrylamide molecules to generate an AIE effect, so that the copolymer is endowed with excellent fluorescence ability; moreover, the interaction among copolymer molecules can be specifically changed under thermal stimulation, alkali stimulation and thermal-alkali stimulation, so that the fluorescence color or fluorescence emission peak position / intensity is subjected to conversion regulation, and multi-stimulation responsive fluorescence discoloration is effectively achieved.

The invention discloses preparation and application of a multicolor nano fluorescent probe based on fluorescent micromolecules FRET, belongs to the technical field of medical reagents, and particularly relates to a preparation method of the nano fluorescent probe. Then adding an organic reagent and a siloxane precursor to prepare an organic phase solution, adding the organic phase solution into an alkaline water phase system to form nano particles, and finally coating the outer layer with silicon dioxide to prepare the nano fluorescent probe. The use volume ratio of the donor fluorescent small molecule solution to the receptor fluorescent small molecule solution is (0.5-1): (0-25). According to the invention, donor fluorescent micromolecules are HMAT blue fluorescent micromolecules, and receptor fluorescent micromolecules comprise BODIPY488 or Nile red.

The invention discloses a method for rapidly depolymerizing and carbonizing a carbon-based material through electron beam (EB) pre-irradiation at room temperature and combining with a hydrothermal reaction to improve the synthesis yield of carbon quantum dots (CDs), the action mechanism is that a large amount of stable free radicals are introduced into a reaction system through EB irradiation, the free radicals accelerate depolymerization and carbonization of the carbon-based material, and the synthesis yield of the CDs is improved. Then, smaller segments of carbon compounds are more rapidly polymerized in a closed system of hydrothermal reaction to form a large number of CDs. The technical scheme provided by the invention is simple to operate, is an effective method convenient for large-scale production of the CDs, can adjust the yield of the synthesized CDs by adjusting the radiation dose, and has potential application value in the technical field of industrial production of the CDs.

The invention discloses synthesis and application research of a cyanostilbene derivative, and relates to the technical field of organic fluorescent dyes. The invention relates to synthesis and application research of a cyanostilbene derivative. The synthesis and application research comprises the following steps: a synthesis route of a target product 2e, a focusing induction effect, an organic light-emitting diode, a solvent effect and an acid / alkali stimulated fluorescence response. According to the invention, 2e has a two-state luminescence property, and an AN solution of 2e has sensitive and reversible fluorescence response to acid / alkali stimulation, so that 2e is suitable for an acid / alkali fluorescence sensor. In solvents with different polarities, 2e emits fluorescence with different colors, the relative polarity of the solvents can be judged through naked eyes, the 2e is made into small LED lamp beads emitting green light, the 2e can be widely applied to toys, building decoration and warning signs of'safety channels' and'emergency exits', in addition, the 2e has the AIEE effect, the fluorescence intensity is the strongest when the water content is 85%, and the 2e can be used as a warning sign of the safety channels and the emergency exits. And the fluorescence performance of the material under specific conditions is improved.

The invention discloses a novel ring-substituted and side-chain amino-substituted nile blue dye and a synthesis method and application thereof, a series of dyes which can be simultaneously used for bacterial fluorescence imaging and photodynamic antibacterial treatment are designed and synthesized by taking the nile blue dye as a parent, and the structure of the novel ring-substituted and side-chain amino-substituted nile blue dye is as shown in a general formula I, the dye has high molar extinction coefficient, fluorescence imaging efficiency and active oxygen generation efficiency, and MNBS-C2-NH2 and MNBS-C6-NH2 synthesized in the embodiment show excellent absorption and fluorescence properties in PBS (Phosphate Buffer Solution) and dichloromethane, especially in a range of 640-660nm. A test result shows that the dyes have a remarkable killing effect on escherichia coli under an illumination condition, log CFU is obviously reduced, and dark toxicity is relatively low. Scanning electron microscope observation further proves that the bacteria subjected to light treatment have obvious membrane surface collapse and rupture phenomena. Through the outer membrane protein of the gram-negative bacteria, the enhanced penetrating ability and killing ability on the gram-negative bacteria can be realized, and wide application prospects are realized in the field of antibacterial treatment.

The invention belongs to the technical field of fluorescent probes, and discloses a coumarin molecular probe containing a porphin group and a preparation method and application of the coumarin molecular probe. The preparation method comprises the following steps: performing chloroacylation modification on two carboxyl groups in dicarboxyphenyl porphin molecules to obtain a chloroacylated porphin compound; and carrying out nucleophilic addition reaction on the chlorine compound subjected to chlorine acylation and coumarin containing hydroxyl to prepare the coumarin molecular probe containing the chlorine group, the preparation process is simple, the requirement for reaction conditions is low, the yield is high, the molecular probe has high selectivity, sensitivity and anti-interference performance on Fe < 3 + >, Fe < 2 + > and Fe < 3 + > can be accurately distinguished, and the molecular probe has good application prospects in the fields of light absorption antennas, organic light emitting diodes, fluorescent probes, anti-tumor drugs and the like.

The invention belongs to the field of preparation of inorganic flame-retardant materials, and particularly relates to a preparation method and application of nitrogen-phosphorus-silicon co-doped flame-retardant fluorescent carbon quantum dots. The nitrogen-silicon co-doped carbon quantum dots are prepared by adding a carbon source compound, a nitrogen source compound and a silanization reagent in the hydrothermal synthesis process, meanwhile, the surfaces of the carbon quantum dots contain rich amino groups, one hydrogen atom in the amino groups is substituted by a phosphorus source compound spiro phosphate diacyl chloride, and the nitrogen-silicon co-doped carbon quantum dots are obtained. According to the nitrogen-phosphorus-silicon co-doped carbon quantum dot, nitrogen, phosphorus and silicon elements can improve the fluorescence yield and the flame retardant property of the carbon quantum dot. Moreover, the nitrogen-phosphorus-silicon co-doped flame-retardant fluorescent carbon quantum dot prepared by the method has a spiral ring structure on the surface, is sprayed on the surface of a fabric in a post-finishing form, is subjected to ring-opening crosslinking under the action of a photoinitiator and UV light, and can be effectively combined with a fiber base material, so that the problem of falling in the subsequent washing and using processes is solved.

The chemical formula of the lanthanum potassium borate compound is K15La7 (BO3) 12, the chemical general formula of the rare earth doped compound of the lanthanum potassium borate is K15 (La1-xREx) 7 (BO3) 12, 0 < x < = 0.3, RE is a rare earth element and is selected from one or more of Nd, Eu, Tb, Ho, Er and Yb, and the rare earth doped compound of the lanthanum potassium borate is selected from one or more of Nd, Eu, Tb, Ho, Er and Yb. The material has the advantages of low cost, easily available resources, simple preparation process, stable physicochemical properties and the like, shows excellent nonlinear optical effect, self-frequency-doubling characteristic and fluorescence property, is expected to become a high-performance nonlinear optical material, and can also be used as an LED fluorescent powder material.

The invention relates to a preparation method of a fluorescent probe for detecting permanganate ions, which comprises the following steps: dissolving purslane powder and o-phenylenediamine (OPD) in ethanol, uniformly mixing, carrying out heating reaction, and cooling to room temperature to obtain a suspension; filtering and dialyzing the suspension to obtain a purified solution; carrying out rotary evaporation on the purified solution in a water bath to obtain a solute; and dissolving the solute in ultrapure water, and freeze-drying to obtain carbon quantum dot fluorescent probe powder. According to the invention, purslane is used as a precursor, o-phenylenediamine is used as a nitrogen doping agent, and the nitrogen-doped carbon nanodots (N-CDs) are synthesized through a solution heat reaction in ethanol. The obtained N-CDs shows excellent oxidation resistance, and shows excellent fluorescence stability under the conditions of extreme pH, salt concentration and continuous ultraviolet radiation. Meanwhile, the N-CDs have good selectivity on MnO4 <-> ions, the N-CDs and the MnO4 <-> ions are in a linear relation within the concentration range of 0.5-168 mu M, and the lowest detection limit reaches 41.8 nM.

The invention discloses an organic silicon luminescent elastomer based on perovskite quantum dots as well as a preparation method and application thereof, and belongs to the technical field of preparation of photoluminescent elastomers. The organic silicon luminescent elastomer based on the perovskite quantum dots is prepared from the following components in parts by weight: 100 parts of base glue, 1 to 20 parts of modified ABX3 perovskite quantum dots, 10 to 60 parts of filler, 1 to 15 parts of cross-linking agent and 0.1 to 6 parts of catalyst, in the modified ABX3 perovskite quantum dot, A is Cs < + >, B is Pb < 2 + >, and X is Cl <->, Br <-> or I <->. The organic silicon luminescent elastomer based on the perovskite quantum dots, which has good mechanical properties and fluorescence properties, is obtained by making specific limits on all the components and the proportion of all the components; the modified ABX3 perovskite quantum dots are added, so that the modified ABX3 perovskite quantum dots can participate in a cross-linking system, are effectively anchored in a cross-linking network and have good dispersity and stability, agglomeration and intersystem streaming of the perovskite quantum dots are reduced, and good luminous intensity, luminous uniformity and continuity are achieved.

This invention relates to the field of fabric technology, specifically to a breathable antibacterial fabric and its preparation process, and sportswear made from this fabric. The preparation process of the breathable antibacterial fabric includes: preparation of a composite antibacterial agent, preparation of multifunctional polyester fibers, amination modification of phenolic lignin, modification treatment of polyacrylonitrile, and preparation of the breathable antibacterial fabric. The breathable antibacterial fabric of this invention consists of inner, middle, and outer layers: the inner layer is a blend of modal and other materials, which is skin-friendly, moisture-wicking, and antibacterial; the middle layer is a polyurethane film layer; the outer layer contains polyacrylonitrile composite fibers, which are antibacterial, crisp, and breathable. A composite antibacterial agent made of chitosan, cysteine, and copper nitrate imparts dual antibacterial properties to the fabric, reducing bacterial resistance. Ethylene treatment enhances the bonding of components, improving wash resistance and antistatic properties; the co-spinning of amination-modified phenolic lignin and polyacrylonitrile increases fiber strength, breathability, and UV resistance. This fabric is suitable for sportswear.

The invention provides a quantum dot color conversion film resistant to high blue light radiation and high temperature and a preparation method of the quantum dot color conversion film, and belongs to the technical field of color conversion films. The preparation method comprises the following steps: preparing Zn-In / La-S quantum dots, growing ZnS shells on the surfaces of the quantum dots, coating a layer of polydopamine layer to prepare modified ZnS shell-coated Zn-In / La-S quantum dots, mixing the modified ZnS shell-coated Zn-In / La-S quantum dots with graphene oxide-coated ZnCNi3 in a solvent, uniformly spin-coating a polycarbonate film, treating the other surface by the same method, and drying to prepare the quantum dot color conversion film resistant to high blue light radiation and high temperature. The quantum dot color conversion film prepared by the invention has better high blue light radiation resistance and high temperature resistance, is high in ultraviolet and blue light blocking efficiency, low in cost and good in heat resistance and chemical stability, can tolerate water and oxygen environments, and has a wide application prospect.

The invention discloses a reversible thermochromic material based on anthracene derivatives and application of the reversible thermochromic material. The anthracene derivative disclosed by the invention emits weak yellow fluorescence after being excited in a solution state, and can emit bright red fluorescence in a solid state. The reversible thermochromic material comprises the anthracene derivative and a higher fatty acid matrix, has the advantages of being easy to prepare, good in stability, low in cost and the like, can be used for indicating the surface temperature of an object, and has wide application prospects in the fields of food packaging and the like.

The invention relates to the technical field of wheat stain resistance. The invention provides a composition for resisting waterlogging, strengthening seedlings and stabilizing yield of wheat as well as application and a use method of the composition. The composition comprises the following components: S-abscisic acid, paclobutrazol-mepiquat chloride and a humic acid-containing micro-element fertilizer. The combined pesticide provided by the invention can improve the root volume, surface area and dry weight, effectively relieve the influence of waterlogging on root growth, promote the occurrence rate of first tillering of wheat, promote the growth of leaves and tillering and improve the tillering quality. The photosynthetic ability, chlorophyll fluorescence ability, oxidation metabolism resistance and carbon and nitrogen metabolism of the main stem and the first tiller are enhanced. And finally, the improvement of the quality of early-stage stem tiller groups can be promoted, tillering and ear formation are promoted, and the yield is increased.

The invention belongs to the technical field of fluorescence sensing detection, and particularly relates to a fluorescence sensor based on Ln-BMOF and a preparation method and application thereof. The preparation method comprises the following steps: mixing and dissolving Tb (NO3) 3.5 H2O, Eu (NO3) 3.5 H2O, 2-aminoterephthalic acid and o-fluorobenzoic acid in a DMF / H2O mixed solvent, heating, cooling to room temperature, filtering, and drying in vacuum to obtain the sensor Eu < 0.01 > Tb < 0.99 >-BDC-NH2. The device is quick in response, wide in application range and good in durability; in a wide pH range, the stable performance is still maintained after multiple times of recycling. The Eu < 0.01 > Tb < 0.99 >-BDC-NH2 obtained by the invention can be directly detected in an aqueous solution, is suitable for actual water sample analysis, can be repeatedly used, and provides a novel platform for on-site rapid screening of PA and Fe < 3 + > in the environment.

The application relates to a transition metal doped thermal injection type colloidal quantum dot and a preparation method thereof, and belongs to the technical field of quantum dot material synthesis. The method comprises the following steps: 1) mixing tellurium powder and tri-n-octylphosphine, heating to 140-160 DEG C under a protective atmosphere, and keeping the temperature for 20-40 min to obtain a tellurium precursor; 2) mixing silver acetate, a transition metal acetate and dodecanethiol, heating to 115-140 DEG C under a protective atmosphere, adding the obtained tellurium precursor, reacting for 10-20 min, and cooling to room temperature to obtain a quantum dot stock solution; and 3) separating and purifying the obtained quantum dot stock solution to obtain transition metal doped silver telluride quantum dots. The method is simple in operation, uniform in doping, and high in controllability; impurity energy levels are introduced under the premise of not damaging the crystal lattice structure through transition metal doping, the emission spectrum of the quantum dots is widened, wide spectrum light emission from visible light to near infrared is realized, and the optical performance and stability are effectively improved; and the obtained quantum dots can be widely applied to the fields of infrared detection, biological imaging and optoelectronic devices.

The application discloses a fluorescent composite material, a preparation method thereof and application thereof in detecting formaldehyde, and belongs to the technical field of formaldehyde detection. The fluorescent composite material is of a NaYF4@CDs@SiO2@MIP structure and is in a multilayer core-shell configuration, and its components are sequentially arranged from inside to outside as follows: an up-conversion energy core layer: NaYF4:Yb 3+ / Er 3+ nanoparticles; a fluorescent response intermediate layer: carbon quantum dots loaded on the surface of the core layer; a protection and function interval layer: a mesoporous SiO2 shell layer coated on the outer layer of the CDs; and a specific recognition outer layer: a formaldehyde molecular imprinting polymer shell layer with imprinting cavities complementary to the spatial structure and functional groups of formaldehyde molecules. The material can realize accurate quantitative detection of formaldehyde in the range of 0.003-12.1 mg / L, has a response time of less than 5 min under a 980 nm excitation light source, has excellent fluorescence stability and strong anti-interference capability, and can be directly applied to on-site detection of complex substrates.

The present invention provides a method, product and application for preparing iodine-nitrogen doped carbon quantum dots based on solvent-free pyrolysis, belonging to the technical field of carbon quantum dots. The present invention grinds laver into powder and mixes it with urea, heats it in an oil bath under magnetic stirring, then cools it to room temperature, adds deionized water to dissolve the solid, centrifuges, filters, and dialyzes to obtain iodine-nitrogen doped carbon quantum dots. The present invention prepares I,N‑CQDs ​​with high stability and good water solubility through a solvent-free pyrolysis method, avoiding the shortcomings of traditional hydrothermal methods that require high temperature, high pressure, and a large amount of solvent, and the obtained I,N‑CQDs ​​have good fluorescence stability and fluorescence performance, and can be used for Fe in environmental samples. 3+ Determination.

The present invention relates to the technical field of ceramic glaze production, specifically to a composite ceramic glaze and a preparation method and application method thereof. The composite ceramic glaze comprises the following raw materials: quartz; kaolin; feldspar; talc; boric acid; limestone; nano silicon dioxide; nano alumina; silver-loaded zeolite; nano titanium dioxide; zinc oxide; silicon powder; magnesium oxide; bentonite; zirconium oxide; cerium oxide; lanthanum oxide; lithium fluoride; luminescent phosphor; long afterglow phosphor. The present invention greatly reduces the sintering temperature by compounding the raw materials in the glaze, thereby providing conditions for the addition of phosphors. By doping and compounding the phosphors and coating the surface with a film layer, not only the dispersibility thereof is improved, but also the stability thereof at high temperatures is improved. In the later sintering process, the internal structure of the phosphor changes little, and it can show good fluorescence performance and has self-cleaning performance.

The invention discloses a preparation method and application of a ZIF-8 surface space confinement effect-based gold nanocluster emission-enhanced fluorescent composite probe. The preparation method comprises the following steps: respectively dissolving HAuCl4 and glutathione in water, mixing the obtained two solutions, reacting, and purifying to obtain an AuNCs solution; the preparation method comprises the following steps: respectively dissolving Zn (NO3) 2.6 H2O and 2-methylimidazole in methanol, uniformly mixing the two obtained solutions, reacting, and treating the generated white precipitate to obtain a zeolite imidazole frame-8 solution; mixing the obtained AuNCs solution with a zeolite imidazole framework 8 solution, stirring, self-assembling, and treating to obtain ZIF-8 (Au) nanoparticles; adding zinc nitrate and dimethylimidazole into the nanoparticle solution to react, and treating after the reaction to obtain a sandwich ZIF-8 (at) Au (at) ZIF-8 nano material; the preparation method comprises the following steps: mixing a nano material with an AuNCs solution, and treating to obtain ZIF-8 (at) Au loaded with two layers of AuNCs; and repeating the operation to obtain ZIF-8 (at) (Au (at) ZIF-8) n loaded with n layers of AuNCs. According to the invention, the effective utilization rate of the assembly space and the fluorescence performance are greatly improved, and ultrasensitive detection of fluorescence immunoassay is realized.

The invention relates to a passivation transition metal disulfide nanosheet and a passivation method and application thereof. The passivation method of the passivated transition metal dichalcogenide nanosheet comprises the steps that the transition metal dichalcogenide nanosheet is dispersed in a passivation reagent, ultrasonic treatment is carried out to obtain original dispersion liquid of the transition metal dichalcogenide nanosheet, and then heating treatment is carried out to obtain the passivated transition metal dichalcogenide nanosheet. The passivation method is high in universality, simple in process and wide in application range, the prepared passivated transition metal disulfide nanosheet is remarkable in fluorescence improvement effect and high in fluorescence stability, and the obtained passivated transition metal disulfide nanosheet can serve as a fluorescence conversion material to be applied to an electroluminescent device.

The invention discloses a sulfur quantum dot fluorescent probe for detecting nitrophenol isomers as well as preparation and application thereof, and belongs to the technical field of analysis and detection. Aiming at the problem that nitrophenol is poor in accuracy and convenience in actual detection at present, the sulfur quantum dot is obtained by taking rhodamine 6G as a stabilizer and a fluorescent reference substance and adopting a reaction kettle method under an alkaline condition. The rhodamine 6G sulfur quantum dots (Rho-6G-SQDs) are used as a fluorescent probe, and fluorescence quenching of the Rho-6G-SQDs is caused on the basis of an inner filtering effect and static quenching between nitrophenol and the Rho-6G-SQDs; meanwhile, along with the change of the color of the solution, the color change of the sensing system solution from yellow to green can be observed under an ultraviolet lamp, so that the dual-mode, namely ratio fluorescence and smartphone colorimetric detection capability can be realized. The invention further provides application of the sulfur quantum dot in ratio fluorescence sensing of beta-galactosidase (beta-Gal) activity, and ratio fluorescence determination of the beta-Gal activity is achieved.