49results about How to "Good fluorescent effect" patented technology

The invention relates to a method for preparing biomass based carbon quantum dots. The method comprises the following steps: carbonizing or activating a biomass material so as to obtain a carbonized product of which the carbon content is greater than or equal to 80%, performing nano quantization on the carbonized product by using a thick acid mixing liquid so as to obtain water-soluble fluorescent carbon quantum dots, changing the reaction temperature so as to adjust the fluorescent color of the carbon quantum dots, and performing retaining separation by using a dialysis bag, thereby obtaining carbon quantum dots in a rectangular diamond cluster about 5nm. Compared with the prior art, the method is wide in raw material source based on natural biomass sources and green and environment-friendly. The chemical oxidation preparation process is simple, and preparation of small-size carbon quantum dots can be easily achieved. The carbon quantum dots are stable in fluorescent effect and good in water solubility, and can be used in fields such as biological imaging.

The invention relates to the preparation field of polymer material, aiming at providing the improvement of the preparation method of fluorescent pigment latex. The fluorescent pigment latex prepared by the method has fine particle diameter, uniform distribution, bright color and luster, and also excellent properties of temperature resistance, acid-base resistance, and sun and weather resistance. The technical proposal is as follows: the preparation method of the fluorescent pigment latex comprises the following steps of: 1. preparing a solution system: adding water into a reactor, and stirring for dissolution after sequentially adding a dispersant, a surfactant and a fluorescent dye, thus forming a uniform solution system; 2. adding monomers into the solution system, and stirring to form a uniform emulsified liquid system; and 3. adding an initiator after heating the prepared emulsified liquid system until the temperature is raised to 40 to 100 DEG C, and preparing the required product by polyreaction.

The invention relates to the field of preparation methods of polyetheramine, and especially relates to a hyperbranched polythioether polyamine, and a preparation method and a use thereof. The preparation method is simple, raw materials are nontoxic and are easy to obtain, cysteamine hydrochloride can be prepared through hydrolyzing human and animal hair, alkynyl glycidyl ether can be directly purchased, and the method also has the advantages of low requirements of devices involved in the preparation process, no special or strict conditions, and mild reaction conditions. The molecular periphery of the hyperbranched polythioether polyamine has a plurality of primary amino groups, so the hyperbranched polythioether polyamine can be used as an epoxy resin flexible curing agent; and hyperbranched polythioether polyamine hydrochloride which is the precursor of the hyperbranched polythioether polyamine has a strong fluorescence effect, a good antibacterial performance and a good sterilizing performance.

A method for visualizing hidden fingerprint includes preparing CdTe fluorescent nanoparticles, using glass atomizer to spray nanoparticles solution onto fingerprint carrier surface carried with fingerprint, using cyanoacylate to stream surface of fingerprint carrier to form reinforced film of fingerprint and using ultraviolet ray fluorescent photograph means to obtain fluorescent fingerprint image. The visualizing system used for realizing said method is also disclosed.

The invention discloses carbon nitride hydrogel and a preparation method thereof. The hydrogel consists of high-dispersion carbon nitride, N,N-dimethyl acrylamide as a polymer monomer and N,N'-methylene bisacrylamide as a cross-linking agent jointly. The preparation method comprises the following steps: generating photo-induced electrons and cavities by using a semi-conductor carbon nitride material under the condition of photo-initiation; reacting the photo-induced electrons and the cavities with abundant water to generate a large number of hydroxyl radicals; and then carrying out polymerization reaction on monomers for polymerization and the cross-linking agent to form the carbon nitride hydrogel. The carbon nitride hydrogel has good mechanical strength and deformation recovery ability, and has unique hydrophilicity and ultraviolet response. The swelling property of the hydrogel is utilized fully, and after the hydrogel is used for treating water pollution, people can discover that the carbon nitride hydrogel has outstanding adsorption and degradation effects on cationic dyes such as methylene blue (MB).

The invention relates to a light diffusion membrane for display and a preparation method thereof. The light diffusion membrane is obtained by scattering a light diffusant of a core-shell structure in acrylate resin and carrying out ultraviolet light polymerization. Cores of the light diffusant are polysiloxane microballoons, shells of the light diffusant are made of quantum dot hybrid materials of organopolysiloxane zinc oxide, and the micromorphology of the light diffusant is of the inner layer and outer layer core-shell microballoon structure. The partical size of the microballoons ranges form 5mum to 8mum, the thickness of shell layers ranges from 100nm to 400nm, the light diffusant has the obvious photoluminescence phenomenon and presents yellow green fluorescence under an 365nm ultraviolet lamp, and a wave band near the microballoons has adjustability. The light diffusion membrane prepared through the method has an excellent light diffusion effect, the photoluminescence character is also presented in the membrane, and the light diffusion membrane can be used as a novel light diffusion membrane in a liquid crystal display backlight module. The light diffusion membrane is good in mechanical property and ageing-resistant performance and low in cost; the preparation method of the light diffusion membrane is simple, production is easy to expand, and the preparation process is friendly to the environment.

The invention discloses a three-branch-like nucleic acid nano silver fluorescent cluster as well as a preparation method and an application. The preparation method comprises the steps as follows: (1)three oligonucleotides are designed and synthesized according to a base complementary pairing principle to be used for forming three-branch-like DNA with the same sticky ends on all branches; (2) thethree oligonucleotides are prepared into corresponding aqueous solutions; (3) a three-branch-like DNA solution with the same sticky ends on all branches is prepared; (4) the three-branch-like DNA solution with the same sticky ends on all branches, a silver nitrate aqueous solution, a phosphate buffered solution and a sodium borohydride aqueous solution are stirred, and the three-branch-like nucleic acid nano silver fluorescent cluster is obtained. The three-branch-like nucleic acid nano silver fluorescent cluster is stronger in fluorescent effect and stable, the sensitivity of a fluorescent material in analysis and detection is improved, and the application range of the nucleic acid nano silver fluorescent material is expanded. The nucleic acid nano silver fluorescent cluster can detect Dtype amino acid.

A method for preparing nano pipe sodium titanate / metatitanic acid, comprising the following steps: (1) mixing the compound containing titanium with the strong alkaline solution with the wight proportion being 20-80%; (2) heating and backflowing in the microwave oven for 10 minitues-20 hours; (3) cooling and depositing the reacted mixing liquid, washing the deposite to make the pH be 6-8, separating and getting the nano pipe sodium titanate, immersing the product got in the above reaction in strong acid for 3-72 hours, washing, drying and getting the nano pipe metatitanic acid. The invention is characterized by the temperated reacting condition, fast reaction velocity, high performance and cost ratio of the product and being suited to produced industrially.

The invention pertains to polymeric material field, which mainly relates to a method for synthesis of organic and inorganic composite silica nano line. The method adopts amorphous silica as silicon source, and under the condition that Fe exists, the organic and inorganic composite silica nano line is obtained by one-step liquid-gas phase reaction of organic amine solution. The synthesis method is simple with low cost. The produced organic-inorganic composite silica nano line has the advantages of good fluorescence activity, large specific surface area, good insulation performance and rich surface silanol groups, thus having high application potential in the fields such as assembly of micronano device, study of nano array and nano optical transmission and nano high insulation resistance; at the same time, as a novel nano material, the organic-inorganic composite silica nano line also has broad developing prospect in the fields such as traditional industrial catalyst, polymer material reinforcement, cosmetic whitening and ultraviolet ray prevention, etc.

The invention relates to a method for preparing a spherical carbon heavy metal adsorbent. The method is characterized by taking pentosan extracted by a bleached hardwood pulp alkaline method as a raw material and pure water as a solvent, and comprising the steps of after treatment at high temperature and high pressure under a hydrothermal condition, centrifugally separating so as to obtain a dark brown solid product, namely carbon spheres rich in acid oxygen-containing functional groups, washing the dark brown solid product for many times by distilled water and absolute ethyl alcohol till filtrate is clear, and drying in vacuum so as to obtain the spherical carbon heavy metal adsorbent. The method has the main characteristics that the pentosan extracted from a byproduct of pulping and papermaking is taken as the raw material and is environmentally friendly, cheap and easily available, water is taken as the solvent, the reaction needs no modifier and further oxidation, the adsorbent containing a large quantity of hydroxyl and carboxyl oxygen-containing functional groups is formed through dehydration, condensation, aromatization and carbonization, the adsorbent and metal ions can have chelation, and the adsorbent can be used as high performance adsorbent for adsorbing heavy metal ions like Pb(II) and Cd(II).The hydrothermal reaction adopted in the method has a simple operation process and the adsorbent is low in cost and has an excellent adsorbing effect.

A hydrothermal preparation method of a carbon quantum dot used as a visible light catalytic photosensitizer is characterized by comprising the following steps: taking larches as raw materials; carrying out high-temperature high-pressure hydrothermal process treatment on the raw materials; centrifugally filtering and removing a dark brown solid product to obtain a light yellow liquid product; centrifuging the liquid product at high speed; controlling centrifugal rotation speed and centrifugal time; removing insoluble small particle impurities; carrying out dialysis by using a certain molecular weight of dialysis bag to remove unreacted sugars, salt contents and the like; then carrying out concentration to obtain a target product, namely a water-soluble fluorescent carbon quantum dot. The water-soluble fluorescent carbon quantum dot is compounded with TiO2 to prepare a photocatalytic composite system; by taking antibiotics as models, photocatalytic degradation performance of the composite system on the model and interaction efficiency of the carbon dot used as the photosensitizer are inspected. The operation process has the main characteristics that larches with rich resources in Heilongjiang province are used as raw materials; the raw materials are environment-friendly, are low in cost and are easy to get; hydrothermal reaction is low in temperature and low in pressure, addition of passivating agents such as acid, alkali and salt is not needed, the product is water-soluble and has a certain fluorescent effect, the reaction process is simple to operate, and the cost is low.

The invention discloses a bridged double-center BODIPY derivative containing fluorene at a meso-position and a preparation method thereof. The preparation method comprises the following steps: synthesizing a symmetric dialdehyde compound containing bridging groups consisting of benzene, thiophene and furan and different substituent groups like a butyl group and an octyl group; then subjecting the symmetric dialdehyde compound and pyrrole to a reaction under the catalysis of indium trichloride so as to synthesize a bis(dipyrrolidine) compound; and successively carrying out oxidation by chloranil and fluoroboronation by boron trifluoride ether so as to obtain a fluorene-containing different bridging group-substituted BODIPY dye which has a structural general formula as shown in a formula I that is described in the specification. According to the invention, fluorene and the bridging groups consisting of benzene, thiophene and furan are introduced for the first time and conventional synthetic methods are improved, so the obtained double-center BODIPY dye has stable spectral absorption; and introduction of thiophene, furan and fluorene enables the fluorescence emission peak of the derivative presents obvious red shift, and fluorescence effect is enhanced with enhancement of system conjugative effect. The organic dye can be efficiently synthesized and widely used in fields like life science, analytical chemistry and environmental energy.

The invention relates to a silver / graphene-coated silicon dioxide composite upconversion nanocrystal and a preparation method thereof. The nanocrystal structure of the obtained silver / graphene@SiO2-NaLuF4:Yb,Gd,Er composite fluorescent nanoparticles is as follows: silver-on-graphene is used as an inner core and coated with silicon dioxide, and the upconversion nanocrystal is grafted onto the silicon dioxide surface. The metal reinforced fluorescence effect of the noble metal silver is utilized to enhance the luminescent intensity of the upconversion nanocrystal. The silver is supported on the graphene to well prevent the silver particles from aggregation, and the silver nanoparticles, which are dispersed and fixed to the graphene, generate field effect superposition due to short distance, so that the mutual polarity and surface plasma resonance are mutually reinforced. Since the graphene is an excellent electron acceptor and conductor, after the charges of the silver nanoparticles transfer to the graphene, the electron density becomes lower, the effective dielectric constant increases, and thus, the surface plasma resonance of the nano silver is enhanced, so that the metal reinforced fluorescence effect of the nano silver becomes higher. The method enhances the upconversion luminescent intensity of the rare-earth upconversion nanocrystal by about 50 times.

The invention provides a method for preparing novel aqueous fluorescence polyurethane. The method comprises the following step: enabling a fluorescent agent to react with isophorone diisocyanate, polytetramethylene ether glycol and methyldiethanolamine, so as to synthesize a modified aqueous polyurethane fluorescence material. The prepared novel aqueous fluorescence polyurethane has the advantagesof being friendly to environment, high in stability and good in fluorescence effect, and can be applied to fields such as anti-fake marks, traffic marks, elastic materials, chemical detection, fluorescence inks and fluorescence coatings.

A method for enhancing the X-ray diffraction intensity of an oxide layer on a steel surface belongs to the technical field of X-ray diffraction methods, and is used for enhancing the diffraction intensity of an oxide layer on a steel surface by using X-ray grazing incidence. The technical solution is: to scan the steel plate with an oxide layer on the hot-rolled surface by means of grazing incidence of X-rays, and set the grazing incidence angles to 3°, 2° and 1.5°, and collect data. And use the conventional θ-2θ scanning mode to scan the phase, and the scanning time is the same. The comparison of the results of the two scanning methods shows that the diffraction intensity of the oxide layer increases significantly and the diffraction intensity of the matrix decreases significantly when the grazing incidence mode is used to analyze the oxide layer on the surface of the sample. The invention proposes a new method for enhancing the X-ray diffraction intensity of the oxide layer on the steel surface, which is an innovation in the analysis method of X-ray diffraction materials, and can effectively improve the diffraction count rate of the crystal structure of the oxide layer, improve the signal intensity, and prevent oxidation Structural measurements of the iron skin are more accurate.

The present invention relates to a color rendering fluorescence silica gel and a preparation method thereof, and an application of color rendering fluorescence silica gel in aerocraft oil leakage detection. The raw material components of the color rendering fluorescence silica gel comprise a fluorescence color rendering agent and silica gel, and the mass ratio of the fluorescence color rendering agent and the silica gel is (0.8-1.2): / (9-21). The preparation method comprises the steps of: mixing the fluorescence color rendering agent and the silica gel, stirring the mixture until the silica gelbecomes uniform red brown, and performing deposition of the mixture to obtain color rendering fluorescence silica gel. After the color rendering fluorescence silica gel absorbs aircraft fuel, the color rendering fluorescence silica gel has a good fluorescence color rendering effect in a condition of a 365nm conventional ultraviolet lamp, has high discrimination for two phases of water and oil, can rapidly absorb overflowing fuel oil liquid drops and can maintain fuel oil trace in a high-humidity and high-steam condition, can store the fluorescence color rendering effect for long time, can beeffectively used on the ground in a range from a high temperature to a low temperature, cannot generate phenomena such as 'cowardice' and falling-off in the high-humidity and large-airspeed high-altitude flight conditions, and has no corrosivity for the oil paint of the skin and the surface of the aircraft.

A method for preparing nano pipe sodium titanate / metatitanic acid, comprising the following steps: (1) mixing the compound containing titanium with the strong alkaline solution with the wight proportion being 20-80%; (2) heating and backflowing in the microwave oven for 10 minitues-20 hours; (3) cooling and depositing the reacted mixing liquid, washing the deposite to make the pH be 6-8, separating and getting the nano pipe sodium titanate, immersing the product got in the above reaction in strong acid for 3-72 hours, washing, drying and getting the nano pipe metatitanic acid. The invention is characterized by the temperated reacting condition, fast reaction velocity, high performance and cost ratio of the product and being suited to produced industrially.

The invention belongs to the technical field of conversion luminescence materials and relates to a silver-containing nanocrystal blue light enhanced tellurite glass and a preparation method of the tellurite glass. The glass comprises glass phase components, externally doped rear earth oxides and silver salts and is prepared by virtue of melting and thermal treatment, wherein the glass phase components include the following substances in percentages by mol: 60-80% of TeO2, 5-10% of WO3, 0-5% of La2O3, 0-5% of GeO2, 5-10% of ZnO, and 5-20% of ZnF2+ZnCl2; the externally doped rear earth oxides include the following ingredients in percentages by mol based on the molar contents of the above glass phase components: 0.02-0.1% of Tm2O3 and 0.1-1% of Yb2O3; and the silver salts include the following ingredients in percentages by mass based on the mass contents of the above glass phase components: 0.3-0.7% of AgCl+AgF. The silver-containing nanocrystal blue light enhanced tellurite glass disclosed by the invention can be widely applied to the manufacturing of a blue light emission laser device.

The invention discloses a zinc complex, a preparation method thereof and an application thereof in preparing anti-forgery ink. The metal complex provided by the invention has an excellent fluorescent effect when being used for ultraviolet fluorescence anti-forgery ink, is colorless in the sun, and deep purple under the radiation of ultraviolet light. The complex almost satisfies the requirements for preparing ultraviolet fluorescence anti-forgery ink. Moreover, the fluorescent agent and the ink material are uniformly dispersed. Therefore, the complex has an extensive application prospect in the printing filed, and can be used for the anti-counterfeiting of high-end products such as bills, currencies, negotiable securities and the like.

The present invention relates to a loaded latex particle comprising a latex material made from a mixture represented by formula (X)m-(Y)n-(Z)o-(W)p, wherein Y is at least one monomer with at least two ethylenically unsaturated chemical functionalities; Z is at least one polyethylene glycol macromonomer with an average molecular weight of between 300 and 10,000; W is an ethylenic monomer different from X, Y, or Z; and X is at least one water insoluble, alkoxethyl containing monomer; and m, n, o, and p are the respective weight percentages of each monomer. The particle may be loaded with a fluorescent dye.

The invention belongs to the technical field of up-conversion nano-composite materials, and especially relates to a preparation method and an application of an up-conversion material NaYF4:Yb,Er@M. The preparation method includes the following steps: (1) dispersing an up-conversion nano-material NaYF4:Yb,Er in a solution containing metal M ions, performing aging for 1-24 h to make the surface of the up-conversion material NaYF4:Yb,Er fully absorbs the metal M ions, and centrifuging the obtained solution to obtain a precursor; and (2) placing the precursor obtained in step (1) in a reducing agent, reducing the metal M ions into metal M, and separating the NaYF4:Yb,Er@M up-conversion material after the completion of the reduction in order to obtain the up-conversion material NaYF4:Yb,Er@M. Metal particles are attached in situ onto the surface of NaYF4:Yb,Er, and are very uniformly distributed to form the ideal up-conversion composite material, so that the fluorescence performance of theup-conversion material is significantly enhanced.

The invention relates to the immunofluorescence technology field, and especially relates to a stationary liquid and fixed cell method and application. The invention discloses a stationary liquid. A liquid A is cold methanol with a volume fraction of 90%, and a liquid B is paraformaldehyde with a volume fraction of 1%. The stationary liquid is beneficial to cell climbing. Cells are not easy to falloff, the number of the cells is large during immunohistochemistry, a dosage of paraformaldehyde in the stationary liquid is small, antigen losses can be prevented, normal structures of the cells canbe maintained, and antigens can be kept in a state of combining with antibodies as much as possible so that a fluorescence effect is remarkable during immunofluorescence detection, and a fluorescenceimage is attractive and accurate. Besides, compared with other stationary liquids, the stationary liquid is economical and easy to obtain, does not have flammable and explosive hazards, can be operated at a room temperature, and does not require a special experimental environment.

The invention provides a method for preparing water-soluble fluorescent carbon nanoparticle dots. The method is characterized by comprising the following steps: using a high temperature and high pressure hydrothermal method for treating pentosan which is obtained by using an alkaline process for extracting bleached broad leaf pulp and serves as a raw material, filtering so as to obtain a pale yellow liquid product and a dark brown solid product, wherein the solid product is used as a high-performance adsorbent for adsorption of heavy metal ions Pb (II) and Cd (II), centrifuging the pale yellow liquid product at a high speed, controlling centrifugal rotating speed and time, removing insoluble solids, removing components such as unreacted sugar and salts by using a dialysis bag, and concentrating so as to obtain the water-soluble fluorescent carbon nanoparticle dots. The operation technology has the main characteristics that the pentosan obtained by extracting pulping and papermaking byproducts is used as the raw material and is environmentally friendly, low in cost and easy to obtain, acid-base salts such as passivator do not need to be added during reaction, the product has good water solubility and fluorescent effect, the hydrothermal reaction process is simple to operate, and the cost is low.

The invention discloses a method for preparing a steady-persistence luminous ceramic membrane through magnesium or magnesium alloy surface micro-arc oxidation. The method comprises the steps that 1, an electrolytic solution is prepared by taking water as a solvent, uniformly stirred and then put into an electrolytic bath; and 2, to-be-treated magnesium or a to-be-treated magnesium alloy is put into the electrolytic solution to serve as an anode; a stainless steel plate serves as a cathode; and the uniform steady-persistence luminous ceramic membrane is grown on the surface of magnesium or the magnesium alloy. According to the method, strontium hydroxide and lauryl sodium sulfate are added to the micro-arc oxidation electrolytic solution, strontium hydroxide can react on the surface of magnesium or the magnesium alloy to be converted into a fluorescent substance, namely strontium aluminate in a micro-plasma arc discharge process during micro-arc oxidation treatment, and strontium aluminate sinters with the ceramic membrane at the moment of high energy reaction into a whole to become one of components in the ceramic membrane, so that the ceramic membrane has the steady-persistence luminous characteristic, and has the advantages of tight combination and uneasiness in falling.

The invention discloses a novel ABX3 type hybridization perovskite crystalline material, a preparation method thereof and an application of the material, and belongs to an orthorhombic crystal system. The chemical formula of the crystalline material is (C5N2H9) CdCl3, a space group of the crystalline material is Pnma, cell parameters of the crystalline material are a= 11.2-11.3A, b= 7.1-7.2 A, c=12.4-12.5 A, wherein alpha=beta=gamma= 90 degrees, and Z=4. The crystalline material has high fluorescence effect in solvents. Acetonitrile has quenching effect on solution dissolving crystals, and the crystalline material has wide application prospect in chemical sensors, luminescent systems, biomedical sciences, negative ion detection and the like.

The invention discloses a fluorescent acrylic fiber and a preparation method of same. The fluorescent acrylic fiber is composed of a core layer and a skin layer, wherein the core layer is polyacrylonitrile and the skin layer is a mixture of fluorescent powder and polyacrylonitrile. The preparation method includes the steps of: 1) preparing an acrylic fiber spinning raw solution; 2) spinning the acrylic fiber; and 3) feeding oil and collecting the acrylic fiber. In the method, with the carrying effect of hot nitrogen gas, the fluorescent powder is adhered to the surface of the acrylic fiber spinning raw solution and then is quickly mixed with the polyacrylonitrile on the surface layer of the acrylic fiber spinning raw solution, so that with solidification and shaping of the acrylic fiber spinning raw solution, the fluorescent powder is fixed on the surface layer of the acrylic fiber, so that the fluorescent acrylic fiber having a core-skin structure is produced. The fluorescent acrylic fiber is independent of effect of a binder, wherein the fluorescent powder is distributed on the surface of the acrylic fiber, so that the product has high fluorescence fastness and fluorescent effect. In addition, the fluorescent powder is high in effective utilization rate, so that production cost is reduced.

The invention discloses a multi-branched nucleic acid nano-silver fluorescent cluster and a preparation method and a purpose thereof. The preparation method comprises the following steps: 1) accordingto a complementary base pairing principle, designing to synthesize three oligonucleotides to form three-branched DNA with each branch having a same cohesive end; 2) preparing three oligonucleotides to a corresponding aqueous solution; 3) preparing a three-branched DNA solution with each branch having the same cohesive end; and 4) taking the three-branched DNA solution with each branch having thesame cohesive end, a silver nitrate aqueous solution, a phosphatic buffer solution, and a sodium borohydride aqueous solution for stirring to obtain the multi-branched nucleic acid nano-silver fluorescent cluster. The multi-branched nucleic acid nano-silver fluorescent cluster has strong fluorescence effect, and is stable, the cohesive end can be changed, and the multi-branched nucleic acid nano-silver fluorescent cluster endows the novel applications to a material by connecting different functional molecules. By using the silver particles in the material, the multi-branched nucleic acid nano-silver fluorescent cluster has inhibiting effect for Gram-negative bacteria positive bacterium and Gram-negative bacteria.

The invention discloses porphyrin modified by diethylenetriamine pentaacetic acid gadolinium and a preparation method and application thereof. The porphyrin modified by diethylenetriamine pentaacetic acid gadolinium has the following structure (I) shown in the specification of the invention. The porphyrin modified by diethylenetriamine pentaacetic acid gadolinium has favorable water solubility and higher biomagnetic effect. Through large quantity of grope by the inventor, the orphyrin modified by diethylenetriamine pentaacetic acid gadolinium has high enhancement in clinical MRI (Magnetic Resonance Imaging) and also stronger fluorescence quantum yield, strong fluorescent effect and wide application prospect and can be applied to the fields of nonlinear photoelectric materials, magnetic resonance imaging diagnosis, fluorescent molecular probes and the like. A preparation method of a porphyrin contrast agent modified by the diethylenetriamine pentaacetic acid gadolinium is concise and easy to operate.

The invention discloses multi-branch nucleic acid nano-silver fluorescent clusters and its preparation method and application. The preparation method is as follows: (1) According to the principle of complementary base pairing, three oligonucleotides are designed and synthesized to form each branch with Three branches of DNA with the same sticky ends; (2) three oligonucleotides were formulated into corresponding aqueous solutions; (3) three branches of DNA solutions with the same sticky ends were prepared; (4) each branch was prepared with There are three dendritic DNA solutions, silver nitrate aqueous solution, phosphate buffer solution and sodium borohydride aqueous solution with the same sticky ends to stir to obtain multi-dendritic nucleic acid nano-silver fluorophore clusters; multi-dendritic nucleic acid nano-silver fluorophore clusters of the present invention have relatively Strong fluorescent effect, stable, and sticky ends can be changed to connect different functional molecules, endowing materials with new applications. The invention is mainly beneficial to the existence of silver particles in the material, and has inhibitory effect on Gram-negative bacteria-positive bacteria and Gram-negative bacteria.