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141results about How to "High quantum yield" patented technology

Method for preparing multicolor fluorescent graphene quantum dots by microwave process

The invention discloses a method for preparing multicolor fluorescent graphene quantum dots by a microwave process. A carbon material is used as a reaction raw material to obtain the product by two reaction steps. The method comprises the following steps: 1. dispersing the carbon material in a mixed solution of water, concentrated nitric acid and concentrated sulfuric acid, carrying out thermal oxidation, dispersing the obtained mixed solution in water, neutralizing, desalting and drying to obtain an oxidized carbon material; and 2. dispersing the oxidized carbon material obtained in the step 1 in N,N-dimethylformamide under the ultrasonic action, reacting the dispersion solution in microwaves, filtering, desolventizing, redispersing and dialyzing to obtain the graphene quantum dots. The proportion of the water, concentrated nitric acid and concentrated sulfuric acid in the step 1 and the microwave reaction conditions in the step 2 can be controlled to obtain the graphene quantum dots with different fluorescent colors. The obtained graphene quantum dots have the advantages of high uniformity and stability, high fluorescence and high quantum yield, and have important application value in the fields of biological marker, fluorescent imaging and the like.
Owner:WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI

Preparation method of high-fluorescent fluorescence carbon quantum dots and application of high-fluorescent fluorescence carbon quantum dots in Cr (VI) detection

The invention discloses a preparation method of high fluorescent fluorescence carbon quantum dots. The preparation method comprises the following specific steps: A, dissolving 0.1 to 10g of citric acid and 0.1 to 10g of glycine into 1 to 20mL of water; B, putting a high pressure reactor into a baking oven, heating for several hours under the condition of high temperature and then carrying out natural cooling to room temperature, thus obtaining dark brown suspension containing the fluorescence carbon quantum dots; C, centrifuging the obtained dark brown suspension to remove large particles, using the means of adsorption with macroporous resin, size exclusion chromatography gel or dialysis, purifying a coarse product by using water as eluant and purifying the fluorescence carbon quantum dots; D, concentrating the purified product by using a rotary evaporator at the temperature of 45 DEG C and carrying out freeze-drying to obtain purified fluorescence carbon quantum dots which are white powder. The preparation method of the high fluorescent fluorescence carbon quantum dots, disclosed by the invention, has the advantages of low cost, simple and controllable preparation process, simpleand convenient operation, high sensitivity and selectivity, intuitive detection results and capability of realizing quantitative detection; the obtained carbon quantum dots have the advantages of highquantum yield, long fluorescence life as well as higher detection sensitivity and stability.
Owner:DALIAN POLYTECHNIC UNIVERSITY

Manufacturing method and temperature detection method for PbSe quantum dot liquid-core optical fiber temperature sensor

The invention discloses a manufacturing method and a temperature detection method for a PbSe quantum dot liquid-core optical fiber temperature sensor. The manufacturing method includes the five steps of selecting colloid PbSe quantum dots in various sizes, preparing a colloid PbSe quantum dot solution, injecting the colloid PbSe quantum dot temperature-sensitive fluorescent material solution and a trichloro ethylene solution into hollow optical fibers of the same type respectively to conduct packaging, completing manufacturing of a colloid PbSe quantum dot liquid-core optical fiber sensitive element, and establishing the PbSe quantum dot liquid-core optical fiber temperature sensor. The temperature detection method includes the three steps of manufacturing the colloid PbSe liquid-core optical fiber temperature sensor, calibrating the colloid PbSe quantum dot liquid-core optical fiber temperature sensor, and conducting multi-point temperature detection through the colloid PbSe quantum dot liquid-core optical fiber temperature sensor. By means of a designed device, multi-point temperature detection can be achieved, the adopted fluorescent material is low in cost, long in service life and high in quantum yield, and the designed temperature sensor is low in manufacturing cost, simple in structure and high in stability.
Owner:JILIN UNIV

Synthetic method of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots

The invention relates to a synthetic method of admium telluride/cadmium sulfide/zinc sulfide quantum dots. An inner core is an admium telluride quantum dot and is coated by cadmium sulfide and zinc sulfide in sequence. The synthetic method for the quantum dots comprises the following steps of: firstly, preparing an admium telluride quantum dot with excellent fluorescent characteristic by hydrolyzing a sulfhydryl group; secondly, adding thiourea with a certain concentration into the reacted admium telluride solution, forming free suplfur ions released by slowly hydrolyzing and photolyzing thiourea and cadmium ion dangling bonds existing on the surface of the admium telluride quantum dot into bonds; generating a thin cadmium sulfide casing layer on the surface of the cadmium sulfide quantum dot; and finally adding a zinc acetate solution and a sodium sulfide solution into the admium telluride/cadmium sulfide quantum dots with nuclear shell structures and carrying out hydro-thermal growth in a polytetrafluoroethylene digestion tank to form the admium telluride/cadmium sulfide/zinc sulfide quantum dots. The quantum dots have the characteristics of high fluorescent strength, favorable stability, high quantum yield and low biotoxicity and are hopeful to be applied to the field of biomarkers instead of the traditional organic dye. The synthetic method has the advantages of simple process, convenience, low cost and strong operability.
Owner:SHANGHAI UNIV

Active near infrared fluorophore as well as preparation method and application thereof

InactiveCN104673273AMild labeling conditionsHigh absorbance coefficientOrganic chemistryIn-vivo testing preparationsCarbon–carbon bondCarboxylic acid
The invention belongs to the field of molecular imaging reagents ad relates to an active near infrared fluorophore for rapidly marking bioactive molecules. A general formula of the active near infrared fluorophore is IRP-B-NHS, wherein IRP is an anthocyanin near infrared fluorophore; B is an aromatic group introduced to the secondary position of the anthocyanin fluorophore by virtue of a carbon-carbon bond; NHS is N-hydroxysuccinimide eater. A preparation method of the active near infrared fluorophore comprises the following steps: with the anthocyanin fluorophore as a parent, introducing benzene carboxylic acid into the fluorophore by virtue of the carbon-carbon bond through Suzuki-Miyaura reaction, modifying phenyl carboxylic acid to produce the N-hydroxysuccinimide eater, reacting with primary amine in a biomolecule under the physiological condition, and marking the biomolecule with the near infrared fluorophore to realize noninvasive tracing. The active near infrared fluorophore is capable of rapidly, safely, effectively and stably marking the bioactive molecules including polypeptide, proteins, antibodies or polymer molecules and has important significance of noninvasively monitoring and quantifying distribution of target active molecules in vivo.
Owner:FUDAN UNIV

Preparation method of flaky silver/silver vanadate composite photocatalyst

The invention discloses a preparation method of a flaky silver/silver vanadate composite photocatalyst. The method comprises steps as follows: sodium vanadate or ammonium metavanadate is added to a mixed liquid of water and ethanol, magnetic stirring is performed for 0.5-1 h, and a solution a is obtained; silver nitrate is added to the mixed liquid of water and ethanol, magnetic stirring is performed for 0.5-1 h, and a solution b is obtained; the solation a and the solution b is evenly mixed, then the mixture is transferred to a reaction kettle provided with a PTFE (polytetrafluoroethylene) lining and reacts at the temperature of 100-140 DEG C for 6-24 h, and the silver/silver vanadate composite photocatalyst adopting a heterostructure is obtained. The obtained composite photocatalyst has the morphology characteristic that silver nanoparticles are supported on a flaky silver vanadate substrate, the particle size of the silver nanoparticles supported on the surface is 50-100 nm, and the diameter of flaky silver vanadate particles is 1-2 mu m. Raw materials used in the method are non-toxic, few by-products are produced in the preparation process, and the method causes small pollution to the environment and is an environment-friendly synthesis technology.
Owner:HEFEI UNIV

Visible-light responded compound catalyst for degrading organic pollutants in salt-containing wastewater and preparation method of visible-light responded compound catalyst

The invention discloses a visible-light responded compound catalyst for degrading organic pollutants in salt-containing wastewater and a preparation method of the visible-light responded compound catalyst. The preparation method comprises the following steps: (1) mixing nano-silica, absolute ethanol and a sodium hydroxide water solution, and carrying out stirring and adsorbing in a water bath until a balanced adsorption system is formed; (2) dropwise adding an ethanol solution in which tetrabutyl titanate and iron salt are dissolved into the balanced adsorption system, so as to react to obtain a suspension system containing compound particles; and (3) transferring the suspension system into a high-pressure kettle, adding an ethanol solution in which rare earth ions are dissolved while stirring, closing the high-pressure kettle, carrying out thermal treatment, cooling and then separating reaction liquid, washing, and drying so as to obtain the visible-light responded compound catalyst. According to the preparation method, the crystallization process of TiO2 and Fe2O3 and the doping process of rare earth metal ions are finished by virtue of solvothermal in one step, so that the method is simple, and conditions are mild; by adjusting parameters in the reaction and thermal treatment processes, the shape and the performance of the photocatalyst can be effectively regulated and controlled.
Owner:HANGZHOU JIUHE ENVIRONMENTAL PROTECTION TECH CO LTD
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