169results about How to "Excellent fluorescence properties" patented technology

The invention discloses application of fluorescent silica nanoparticles as an anti-fake mark. The fluorescent silica nanoparticles are prepared from a silicon source, and the obtained fluorescent silica nanoparticles are used for preparing anti-fake patterns by using anti-fake ink. The fluorescent silica nanoparticles are excellent in luminescent property, high in quantum yield and good in storage stability, and have good excitation wavelength dependency; the prepared anti-fake patterns can display light of different colors under the illumination of different laser wavelengths, and can achieve a good anti-fake effect.

The invention discloses porous graphene and a graphene quantum dot. The porous graphene comprises, but is not limited to 2-9 atomic layers, wherein each atomic layer simultaneously comprises crystal lattices and holes of graphene, but is not limited to the holes of which the apertures are 2-10nm; the area of the holes accounts for about 5%-40% of total area of each atomic layer. The graphene quantum dot is characterized by comprising 1-5 atomic layers; the boundary is in a sawtooth shape; and the dimension of the quantum dot is 2-10nm. The porous graphene disclosed by the invention is uniform in aperture distribution, and not equal in interlayer spacing; and the graphene quantum dot has the advantages of high luminous efficacy, good crystal form and few defects.

The invention relates to a preparing method for a probe molecule which identifies tumor cells specifically, belonging to the nanometer material and biology technical field; the method comprises the following steps: (1) biocompatible folate is used for modifying PEG with the two sides being amino groups; (2) the PEG connected with the folate is modified to the surface of dendrimer PAMAM; (3) oil-soluble ligand on the surface of a quantum dot is replaced by a ligand exchange method, thus preparing a water-soluble quantum dot; the invention can lead the quantum dot to identify cancer cells expressed with high-level folate receptors, thus being capable of being used as a fluorescent probe used for the study of cytology; at the same time, the PAMAM and the PEG are modified to the surface of the quantum dot, thus improving the stability of the quantum dot greatly; furthermore, the PAMAM and the PEG have good biocompatibility and little toxicity, thus providing feasibility for the application thereof in the biology.

The invention belongs to the technical field of quantum dot preparation, and specifically to a method for preparing copper-indium-sulfur (CuInS2) three-element quantum dots under a hydro-thermal condition. According to the method, common metal salt compounds such as copper chloride and indium chloride, and a sulfhydryl-containing carboxylic acid such as mercaptopropionic acid and mercaptosuccinic acid are adopted to synthesize copper-indium-sulfur (CuInS2) nanoparticles with the particle size of 2-4 nm and emission wavelength in the near infrared region under the hydro-thermal condition. Compared to other organic phase synthesis of the near infrared quantum dots, the method of the present invention has characteristics of less variety of the raw materials, cheap price, simple method, easy operation, good repeatability, and low requirements on equipment. Compared to the traditional quantum dots, the synthesized water-soluble quantum dots of the present invention have the following advantages that: the synthesized water-soluble quantum dots do not contain mercury, cadmium and other toxic metal elements, the emission peak is located in the near infrared region, the synthesized water-soluble quantum dots provide strong penetrabilities for cells and other biological tissues, and the synthesized water-soluble quantum dots can be widely used in immunological assays, nucleic acid hybridizations, gene analysis, cell classification and imaging and other fields.

The invention discloses a preparation method of a controlled fluorescent graphene quantum dot. The preparation method comprises the following steps: uniformly and quickly dispersing graphite oxide into ultrapure water by ultrasonic action to obtain a dispersion liquid of graphite oxide; adding different amount of hydrogen peroxide solution into the obtained dispersion liquid of graphite oxide, and at last, obtaining the graphene quantum dot under ultraviolet radiation. The preparation method disclosed by the invention is simple, and short in technology process; the prepared product is small in particle size, uniform in distribution, and excellent in fluorescent property; the conditions can be controlled to prepare the graphene quantum dot with the required wavelength.

The invention discloses a method for ultrasonically synthesizing hyperfluorescent carbon spots, and applications of the hyperfluorescent carbon spots, belonging to the field of nano-luminescence materials. The method comprises the following steps: (1) preparing a mixed solution by taking 0.1-5mol / L glucose as a carbon source, performing ultrasonic treatment to the mixed solution for 0.5-5h under the environment of pH ranging from 1 to 14; and (2) adding 0.1-5mol / L alcohol or amino acid into the mixed solution obtained in the step (1) as a modifier, and aging for 1-48h under the catalytic action of an inorganic salt catalyst, to obtain a hyperfluorescent carbon spots water solution. The method is simple to operate, pollution-free and mass production is easy to conduct.

The invention discloses a preparation method of carbon nanoparticles with controllable photoluminescence. In the method, the hydrothermal process is adopted; and the method comprises the following steps: preparing a solution composed of a carbohydrate which is used as a carbon source and an oxidation additive, feeding the solution to a hydrothermal reactor and heating to allow reactions; carrying out centrifugal separation on the reaction product, washing with water for three times and washing with ethanol for three times; removing salts; and drying to obtain carbon nanoparticles. The method provided by the invention is simple and low in cost. The prepared carbon nanoparticles have good dispersibility, contain abundant surface oxygen-containing groups (such as hydroxyl groups and carboxyl groups) which make surface functionalization or modification of carbon nanoparticles easier, and are excellent in fluorescence properties of ultraviolet-visible excited visible emission fluorescence properties, up-conversion fluorescence properties and near-infrared excitated near-infrared emission properties. The emission spectrum of carbon nanoparticles varies with the change in excitation wavelength.

The invention provides a preparation method of a quaternary ammonium salinized fluorescent carbon dot and application of the quaternary ammonium salinized fluorescent carbon dot in bacterium resisting and gram positive bacterium and gram negative bacterium differentiating. The preparation method of the quaternary ammonium salinized fluorescent carbon dot mainly comprises the two steps that a surface-aminated carbon dot is prepared, and then alkyl betaine is grafted to the surface of the aminated carbon dot to obtain the quaternary ammonium salinized carbon dot. The prepared quaternary ammonium salinized carbon dot has the good water solution dispersibility and the low cytotoxicity and can effectively inhibit and kill gram positive bacteria. In addition, the quaternary ammonium salinized carbon dot has the good fluorescent property and can selectively enable the gram positive bacteria to be imaged to effectively differentiate the gram positive bacteria and gram negative bacteria.

The invention discloses an infrared nonlinear optical crystal and a preparation method and application thereof. The infrared nonlinear optical crystal has a molecular formula shown as A18X21Y6M48, wherein A is Ba, Sr or Pb; X is Zn, Cd or Mn; Y is Ga, In or Al; and M is S, Se or Te. The crystal belongs to a trigonal crystal system, and the space group is R3. Crystal Ba18Zn21Ga6S48 is a type-I phase matching nonlinear optical material, the particle size is in a range of 150-210 mu m, the frequency multiplication intensity and the laser-induced damage threshold of the powder are respectively 0.5 time and 28 times of that of commercial material AgGaS2, others crystals have a same or similar crystal structure and optical and other properties, have important military and civil application prospects, and can be used for optoelectrionic countermeasures, resource probing, space anti missile, communication and the like.

An in-situ preparation-based method for detecting the concentration of glucose by use of fluorescent Ag nano-clusters belongs to the technical field of fluorescent Ag nano-clusters. In the presence of O2, glucose oxidase (GOx) catalyzes and oxidizes glucose to generate H2O2, a free radical produced by 'Fenton Reaction' between H2O2 and Fe<2+> is used for arousing methacrylic acid (MAA) polymerization, the polymerization product polymethyl acrylic acid (PMAA) serves as a stabilizer to prepare fluorescent Ag nano-clusters (Ag NCs) through ultraviolet light reduction method, and the fluorescent emission intensity of the acquired nano-clusters and the concentration of glucose are utilized to build a quantitative relationship, so that the glucose concentration detection can be realized. The prepared Ag NCs is uniform in particle diameter and less than 2 nm in size and has excellent orange fluorescent emission. The method for glucose detection is a fluorescent 'turn-on' process, and the optimal glucose detection condition can be obtained through optimization of the preparation condition.

The invention provides a benzofuran [2,3-b] pyrazine derivative as well as application thereof in an organic electric fluorescent device. The chemical structural formula of the benzofuran [2,3-b] pyrazine derivative is as shown in the specification. In the formula, A is carbazole at different sites and a derivative of carbazole, triphenylamine at different sites and a derivative of triphenylamine, spirofluorene closed loop triphenylamine at different sites and a derivative of spirofluorene closed loop triphenylamine, spirofluorene at different sites and a derivative of spirofluorene, or acridine at different sites and a derivative of acridine. The benzofuran [2,3-b] pyrazine derivative provided by the invention can be used as a light emitting body to prepare the organic electric fluorescent device, an efficient electroluminescence property can be achieved, the maximum light emitting efficiency can be up to 11.5 Cantera per ampere, and the external quantum efficiency is up to 4.44%, which is approximate to the theoretical boundary value of 5% of a fluorescent material as the light emitting body in the organic electric fluorescent device.

The invention provides a method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as a carbon source. The method comprises the following steps: 1) cleaning, slicing, baking and grinding fresh kelp, and sieving to obtain powder; 2) weighing and dispersing a certain amount of kelp powder in ethanol, stirring to obtain paste, putting the paste in an autoclave, and reacting for a period of time at high temperature; and 3) dispersing the product in ethanol, carrying out suction filtration, solvent rotary evaporation, and centrifugal separation to obtain precipitates, and freeze-drying the precipitates to obtain the carbon nanodots. The method provided by the invention is simple in operation, the cost is low, and the raw materials are easy to obtain; and the prepared carbon nanodots have excellent fluorescent properties and good biocompatibility and are expected to be widely applied to important fields, such as chemical sensing, biological analysis, environmental monitoring, photocatalysis, biological imaging and photoelectric conversion.

The invention provides a preparation method for a carbon quantum dot fluorescent probe. The preparation method is characterized by comprising the following steps: heating citric acid and quadrol for reaction, dissolving an acquired mixture into water and then putting into a dialysis bag for dialysis, thereby acquiring the carbon quantum dot fluorescent probe. According to the invention, a one-stepmethod is adopted for successfully preparing an environment-friendly, simple and easily acquired carbon quantum dot served as a fluorescent probe; selectivity and fluorescence characteristic of the carbon quantum dot fluorescent probe are combined for recognizing Fe (III); the carbon quantum dot prepared according to the method has the advantages of green, non-toxicity, simple detection method, high selectivity, and the like; a complex modifying process is avoided.

The invention discloses a method for mass production of water-soluble fluorescent carbon nanoparticles, which comprises the following steps: adding activated carbon, which is used as a carbon source, into an oxidant water solution, and stirring the mixed solution by a magnetic stirrer to obtain a black suspension; treating the suspension with ultrasonic in a 300W ultrasonic cleaning apparatus under the frequency of 40KHz for 2-4 hours; after the ultrasonic reaction finishes, carrying out vacuum filtration on the suspension to obtain a brownish black filtrate; and drying the filtrate by distillation at 60-70 DEG C, and dissolving the obtained black solid in deionized water at room temperature to obtain the purified water-soluble carbon nanoparticles. In the method disclosed by the invention, the water-soluble carbon nanoparticles, which can emit fluorescence from the visible light region to the near-infrared light region and has upconversion fluorescence property and other excellent optical properties, are synthesized under the action of the ultrasonic and strong oxidant. The method disclosed by the invention is simple and easy to implement, and has the advantages of low price, accessible raw materials and environmental protection.

The invention discloses a preparation method and application of a carbon dot / mesoporous silica composite material and belongs to the field of synthesis and application of fluorescent carbon nanomaterials and mesoporous composite materials. The method comprises the following steps: blending citric acid, ethanediamine, mesoporous silica and sodium nitrate into deionized water; carrying out ultrasonic dispersion and then putting in a reactor; carrying out normal pressure microplasma discharge processing; after discharging is ended, centrifugally separating, and washing and drying a solid to obtain the carbon dot / mesoporous silica composite material. The composite material is used for aspects of uranyl ion adsorption and adsorption process monitoring. The method has the advantages of quickness, simplicity and low energy consumption; the prepared carbon dot / mesoporous silica composite material has good fluorescent property and porous structure, and good adsorptive property to uranyl ions; in addition, the fluorescent property of the composite material is used for monitoring the adsorption process, and the visualization of the adsorption process is realized.

The invention discloses a preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances. The preparation method includes the steps of: regulating the pH of a sucrose water solution to alkaline with sucrose as a carbon source, inserting a working electrode, intensively stirring the solution, and applying a voltage to carry out a reaction to obtain a product solution; collecting the product solution and separating out salts to obtain a carbon quantum dot solution; vacuum freeze-drying the carbon quantum dot solution to obtain a powdery solid, which is the carbon quantum dots having the controllable electroluminescent and photoluminescent performances. The method is carried out in a water solution system with the sucrose as a carbon source in an electrochemical manner, wherein different surface passivators are added to the reaction system to control the electroluminescent and fluorescent performances of the carbon quantum dots; in addition, the carbon quantum dots having excellent electroluminescent and fluorescent properties can be obtained without complex subsequent modification treatment, so that the carbon quantum dots has great application value in the fields of fluorescence and electroluminescence, and also has excellent application prospect.

The invention relates to a preparation method rhodamine hybridized carbon dots and application of the rhodamine hybridized carbon dots in mitochondrion target recognition. The preparation method disclosed by the invention has the beneficial effects that a microwave assisted method is utilized, citric acid and an m-amino phenol compound are used as raw materials, fluorescence emission wavelength can be regulated and controlled through a way of changing an amino group in a meta position of phenol, rhodamine molecular fluorogen hybridized carbon dots are generated, and preparation of controllableand divinable fluorescence emission wavelength carbon dots is realized. The preparation method disclosed by the invention is simple in operation, can easily obtain the raw materials and is green andenvironment-friendly, and a new strategy for synthesizing molecular fluorogen hybridized carbon dots is created. The rhodamine hybridized carbon dots prepared by the invention can be used for the mitochondrion target recognition in cells, and has potential application value in the fields of biology, medical treatment and the like.

The invention provides a preparation method of green fluorescent powder made of a one-dimensional nano-structure material of lanthanum phosphate activated by cerium and terbium. The preparation method comprises the following steps of: respectively preparing salt solutions of La<3+>, Ce<3+> and Tb<3+> and a PO4<3-> salt solution, mixing the salt solutions of the La<3+>, the Ce<3+> and the Tb<3+> according to a certain molar ratio, and then mixing with the PO4<3-> salt solution to prepare a mixed solution; regulating the pH value of the mixed solution to 0.5-8; stirring the mixed solution for 0.3-2 hours; and aging the mixed solution in a water bath at room temperature or the temperature of 7 DEG C-95 DEG C for more than one hour under environmental pressure so as to prepare the nanowires of the lanthanum phosphate activated by the cerium and the terbium, namely (La, Ce, Tb)PO4. The preparation method can be implemented by adopting simple and cheap equipment under the environmental pressure, so that production cost can be greatly reduced and industrial production is easy to realize; and adding of a template agent is not required during the preparation process, and environmental effects which are possibly caused by waste liquid are avoided. According to the preparation method disclosed by the invention, the nanowires of the green fluorescent powder of the (La, Ce, Tb)PO4 can be synthesized by water phase / low temperature / normal pressure, the particle size is uniform, the method is simple and convenient, and the energy consumption is low.

The invention provides a method for developing fingerprint on skin by using Fe3O4 / SiO2@Gd2O3:Eu,Bi materials. The method comprises the following steps: utilizing both good magnetism and strong fluorescence properties of Fe3O4 / SiO2@Gd2O3:Eu,Bi magnetic-fluorescence nano materials of a core-shell structure, brushing on a fingerprint which is transferred on the surface of a glass sheet, by a fingerprint brush tip, combining the fingerprint, and developing the fingerprint texture under irradiation of ultraviolet light. The method can be used for overcoming the defect that the magnetic powder method has low sensitivity of developing the fingerprint on the skin, improves the developing success rate of the fingerprint on the skin, is clear for the developed fingerprint on the skin, obvious for contours; and the developing method is simple, and easy to implement, and the Fe3O4 / SiO2@Gd2O3:Eu,Bi magnetic-fluorescence nano materials have stable properties, are easy to store, consumes less, and can be used for greatly improving the developing efficiency of the fingerprint on the skin.

The invention discloses a method for preparing a water-soluble fluorescent silicon nanoparticle by utilizing microwave radiation. The method comprises the steps of: mixing silicon source with trisodium citrate, disodium citrate, citric acid, glutaric acid or butanedioic acid to obtain a precursor solution, putting the precursor solution into a special glass tube for the microwave radiation, and carrying out the microwave radiation in a microwave reactor, so as to prepare the water-soluble fluorescent silicon nanoparticle. The method disclosed by the invention is completely carried out in an aqueous phase and has the advantages that the operation is safe, fast, simple and convenient, the toxin is low, and the raw material is safe and easily available; and the obtained water-soluble fluorescent silicon nanoparticle has excellent monodispersity and fluorescent property, high quantum yield and good stability and water solubility and can be taken as a fluorescent maker to be widely applied to biological detection and analysis.

The present invention relates to chemical technology, and discloses environment friendly process and system for synthesizing nanometer fluorescent semiconductor CdTe crystal material. The synthesis process includes the following steps: preparing Te source, preparing Cd source, mixing the Te source and the Cd source at normal temperature to obtain water solution of CdTe crystal nucleus, adding initiator hydrazine hydrate to initiate CdTe crystal growth and monitoring the growth state with one optical fiber spectroscope, adding terminator n-hexanol to terminate growth after the CdTe crystal reaches its target value, and centrifuging in a high speed centrifuge to eliminate supernatant and obtain CdTe crystal solution. The synthesis system consists of one synthesis unit, one ultraviolet lamp, one detector, one small optical fiber spectroscope and one computer with special software.

The invention and belongs to the technical field of fluorescent nanomaterials, aims to solve the problems of relatively low yield of the current fluorescent carbon quantum dots, poor sensitivity of recognition response and anti-interference ability, a complicated reaction condition and the like, and provides a preparation method and application of fluorescent carbon quantum dots. With corn and dimethylene triamine DETA as raw materials, the fluorescent carbon quantum dots are synthesized in one step by a microwave heating method. The raw materials are cheap and easy to obtain; the carbon pointpreparation process method is simple and environmentally friendly; the fluorescent carbon quantum dots can be synthesized in large quantities; the fluorescent carbon quantum dots have small particlesizes of 3-5nm and uniform sizes, and can be stably dispersed in water, without an agglomeration phenomenon; the fluorescent carbon quantum dots have excellent fluorescence properties and relatively high fluorescent quantum yield; the fluorescent carbon quantum dots have excellent stability, and has stable performance under different ion concentrations, pH values and light irradiation time; the fluorescent carbon quantum dots have high selectivity, good reproducibility and high sensitivity during Cr (VI) and AA detection, and can quickly and accurately detect the contents of Cr (VI) and AA inliquid to be detected.

The invention relates to a fluorescent compound with A beta plaque affinity as shown in the general formula (I) and a composition containing the derivative. The substituent group in the general formula is a composition as shown in the specification. The invention further relates to a preparation method of the fluorescent compound and application of the fluorescent compound in imaging of A beta plaque.

The invention discloses a gold nanorod / silicon dioxide / carbon point nanometer hybrid material. The nanometer hybrid material comprises a gold nanorod as a core, a silicon dioxide layer as a shell, and carbon points distributed on the outer surface of the silicon dioxide layer; and the nanometer hybrid material is obtained by a coupling effect between the silicon dioxide layer coating the outer surface of the gold nanorod and silane functional carbon points containing amido. The invention further discloses a preparation method of the gold nanorod / silicon dioxide / carbon point nanometer hybrid material. The preparation method of the gold nanorod / silicon dioxide / carbon point nanometer hybrid material is simple and controllable. The gold nanorod / silicon dioxide / carbon point nanometer hybrid material realizes application to diffuse reflection imaging through the gold nanorod, realizes application to fluorescent life imaging through the carbon points, realizes non-intrusive multi-mode imaging, and is excellent in application prospect in the cancer diagnosis.

The invention belongs to the field of material preparation, and mainly relates to lanthanum-series porous coordination polymers based on C2v symmetrical ligands, and a synthesis method and an application thereof. A series of fluorescent porous coordination polymers based on the C2v symmetrical ligands with gradually increased conjugacy are designed and synthesized, and the synthesis method is simple, convenient and easy to implement. The prepared novel lanthanum-series porous coordination polymers have good fluorescent properties; by adjusting the ligands and lanthanide elements, chrominance between pink and blue light can be adjusted; based on relatively high quenching coefficient, the polymers can be used for molecular recognition. Single crystal X-ray diffraction reveals that the pore size and the pore volume are controlled by the system, and the prepared porous coordination polymers have potential applications in highly-effective adsorption and release of iodine.

The invention discloses a carbon dot component in cola as well as a property characterization method and a practical application method of the carbon dot. The preparation method comprises the following steps: by taking original-taste (1+2) Nestle coffee, pepsi (330ml) and coca-cola (330ml) as main raw materials, separating and purifying through a dextrane gel G-25 column and performing freeze-drying for 24 hours to collect the carbon dot. The coffee / cola carbon dot is relatively low in cost, low in toxicity, simple in extracting method, good in water solubility, good in biocompatibility and can be widely used as a novel fluorescent carbon nano particle in the field of biomarkers.

The invention relates to a human intestinal tract carboxylesterase activity detection fluorescent probe substrate and a use thereof and belongs to the technical field of medicine. The specific probe substrate is an aromatic ester (TCFE) of (E)-2-(4-(4-hydroxystyryl)-3-cyano-5, 5-dimethylfuran-2(5H)-ylidene)malononitrile (TCF). The substrate can be used for fast quantitative detection of human intestinal tract carboxylesterase activity and fast screening and assessment of a human intestinal tract carboxylesterase inhibitor. The fast quantitative determination process of human intestinal tract carboxylesterase activity comprises selecting a TCFE hydrolysis reaction as a probe reaction, adding an appropriate substrate into a buffer system containing hCE2, and determining real activity of hCE2 enzyme in various external biological samples through quantitative determination of a hydrolysis metabolite TCF generation amount in unit time in a linear reaction zone. The probe has good selectivity and the hydrolysate TCF has long fluorescence emission wavelength of 612nm. The human intestinal tract carboxylesterase activity detection fluorescent probe substrate can reduce biological sample background fluorescence and improve sensitivity and has good practicality and application prospect.

A process for preparing the water-soluble quantum site biofunctionalized by saccharide features that the saccharide with chelating biofunction is used as modifier and the quantum site is changed from oil-soluble one to water-soluble one by grinding white is biofunctionalized by saccharide.

The invention belongs to the field of fluorescent protein materials in biotechnology, and specifically relates to a method for preparing an allophycocyanin tripolymer fluorescent protein. The method comprises the following steps: firstly, cloning allophycocyanin alpha sub-gene apoprotein genes and phycobilin biosynthesis enzyme genes hol and pcyA into an expression vector; and secondly, cloning allophycocyanin beta sub-gene apoprotein genes and chromophore lyase genes cpcS and cpcU into another vector, using the two expression vectors to simultaneously transform Escherichia coli, and screening out an engineering bacterium simultaneously expressing the genes, thus obtaining the allophycocyanin tripolymer fluorescent protein. By using the Escherichia coli as the raw material instead of algae to produce the recombinant photo-activated protein, the Escherichia coli is easy to culture and grows fast, thereby greatly shortening the production cycle. Compared with algae, the cell wall of the Escherichia coli can be broken easily, energy can be saved in the purification process, and a high utilization rate can be achieved.

The invention belongs to the field of nano material manufacturing, and relates to a method for preparing carbon dots by using a microwave-assisted method and application, in particular to a preparation method of fluorescent carbon dots and application of the fluorescent carbon dots in cell imaging. The cell activity can be detected, normal cells can be distinguished from cancer cells and cell membranes can be targeted specific to liver cancer cells. According to the method, citric acid, triethylenetetramine and fluorescein are used as raw materials, ethyl alcohol is used as a solvent, DMSO isused as a cosolvent, a reaction is performed for 2-8 hours at the temperature of 100-140 DEG C by utilizing the microwave-assisted method, and the fluorescent carbon dots are obtained through dialysisand rotary evaporation. The method is easy to operate, easily available in raw materials, green and environment-friendly. The carbon dots prepared by the method can be simultaneously used for detecting cell activity in cells, distinguishing normal cells from cancer cells and targeting cell membranes specific to liver cancer cells. The potential application value is realized in the fields of biology, medical treatment and the like.