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

A semiconductor nanocrystal composition comprising a Group V to VI semiconductor material and a method of making same. The method includes synthesizing a semiconductor nanocrystal core, where the synthesizing includes dissolving a Group V to VI anion gas in a first solvent to produce a Group V to VI anion precursor, preparing a cation precursor, and reacting the Group V to VI anion precursor with the cation precursor in the presence of a second solvent. The reacting may occur in a high pressure vessel.

The invention discloses a preparation method of a graphite phase carbon nitride/rutile monocrystal titanium dioxide (TiO2) nanowire array. The preparation method is characterized by comprising the following steps: (a) dissolving a cyanamide compound or urea in a solution, immersing the prepared rutile monocrystal TiO2 nanowire array into the obtained cyanamide compound or urea solution, and then taking out and drying the nanowire array; and (b) performing heat treatment on the dried nanowire array to finally obtain the graphite phase carbon nitride/rutile monocrystal TiO2 nanowire array. The preparation method has the advantages of simple process and low cost, thus being applicable to large-scale industrial production; and the prepared graphite phase carbon nitride/rutile monocrystal TiO2 nanowire array has good visible light response activity, and can be widely applied to the fields such as photocatalysis, hydrogen production by photocatalytic decomposition of water, photoelectric conversion and the like.

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.

Disclosed is an organic electroluminescent element comprising an anode, a cathode and a component layer including a light emission layer, the component layer being provided between the anode and the cathode, wherein the component layer contains a compound represented by formula 1,

X₁-(A₁)_n  Formula 1

wherein A₁ represents a group represented by formula 2;

The present disclosure is directed to new photoluminescent metal-organic frameworks (MOFs). The newly developed MOFs include either non rare earth element (REE) transition metal atoms or limited concentrations of REE atoms, including: Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Ru, Ag, Cd, Sn, Sb, Ir, Pb, Bi, that are located in the MOF framework in site isolated locations, and have emission colors ranging from white to red, depending on the metal concentration levels and/or choice of ligand.

The present invention provides luminescent complexes between a lanthanide ion and an organic ligand which contains 1,2-hydroxypyridinone units. The complexes of the invention are stable in aqueous solutions and are useful as molecular probes, for example in medical diagnostics and bioanalytical assay systems. The invention also provides methods of using the complexes of the invention.

The invention relates to the field of fluorescence carbon nanomaterials, in particular to a high-quantum-yield eigenstate-fluorescence-adjustable carbon dot and a preparing method and application thereof. Diaminonaphthalene or a hydroxyl, carboxyl, methyl, ethyl, N,N-dimethyl and N,N-diethyl substituted ramification of the diaminonaphthalene and citric acid serve as carbon source precursors, an eigenstate fluorescence carbon dot solution can be obtained through a solvothermal method. The prepared eigenstate fluorescence carbon dot has the beneficial effects of being high in crystallization, high in surface passivation degree, even in nitrogen doping, even in size distribution and the like, and has the wide application prospect.

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.

The invention includes new water-soluble NIR fluorochromes, e.g., for biomedical imaging. The new dyes are highly stable, asymmetric cyanine compounds, characterized by 1) superior chemical stability, 2) excellent optical properties (e.g., high quantum yield), 3) bio-compatibility, 4) conjugatability and 5) ideal in vivo imaging properties. Monoactivated hydroxysuccinimide esters of the new dyes are highly reactive with peptides, metabolites, proteins, peptide-folate conjugates, and other biological macromolecules and affinity ligands, forming stable complexes. Affinity molecules tagged with the new dyes can be used, for example, for imaging of tumors in vivo.

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.

The invention discloses a Fe<3+> molecular fluorescence sensor based on Rhodamine B and a preparation method and application of the Fe<3+> molecular fluorescence sensor. Rhodamine B is taken as a precursor, and a target product N1-(benzene[d] thiazole-2-yl)-N4-(2-(3',6'-bi(diethylin)-3-carbonyl screw[iso-indoline-1,9'-xanthene]-2-yl)ethyl) maleimide is synthesized at two steps. Detection on Fe<3+> by using the target product shows that the target product has a very good detection effect on Fe<3+>; and meanwhile the raw materials of the Fe<3+> molecular fluorescence sensor are easy to obtain, synthesis steps are simple, after-treatment is convenient to implement, and large-scale production can be relatively easily achieved.

The invention discloses a preparation method for a silver-containing carbon dot and application of the silver-containing carbon dot to preparation of an antibacterial agent. The preparation method comprises the following steps: with polyethyleneimine (PEI), citric acid and silver nitrate as raw materials, synthesizing a silver-doped functionalized carbon dot solution (a PEI-Ag carbon dot solution)by using a hydrothermal process or microwave process; and then carrying out centrifugation and drying so as to obtain the solid PEI-Ag carbon dot. The preparation method provided by the invention isenvironment-friendly in preparation and uses cheap and easily available raw materials; and the prepared PEI-Ag carbon dot has good biocompatibility and high quantum yield, can be individually used orcooperatively used with antibacterial agents like tetracycline, gentamycin and cefoxitin, and show inhibitory effect on Staphylococcus aureus, Escherichia coli, Candida albicans and the like.

The invention discloses a hydrogen sulfide detection sensor, a preparation method thereof, a quantitative detection method of hydrogen sulfide, and a qualitative detection method of hydrogen sulfide in cells. The preparation method comprises the following steps: (1) preparing a water solution of copper complex by mixing disodium EDTA, soluble copper salts, and water; (2) subjecting the water solution of copper complex to hydrothermal reactions, filtration, centrifugation, and dialysis to obtain a water solution of copper doped carbon quantum dots in the dialysis bag; (3) mixing the water solution of copper doped carbon quantum dots with a buffer solution to obtain the hydrogen sulfide detection sensor. The hydrogen sulfide detection sensor can carry out quantitative determination on a hydrogen sulfide solution and qualitative detection on hydrogen sulfide in cells.

The invention discloses an aggregation-induced emission type diarylethene fluorescent molecular switch and a preparation method and application thereof. The aggregation-induced emission type diarylethene fluorescent molecular switch is characterized in that an AIE radical is introduced to gain solid or aggregation strong emission capacity; two diarylethene can be used for quickly quenching fluorescence of fluorescent radicals which aggregate in the surrounding under the irradiation of ultraviolet rays or visible light, thus achieving the purpose of high fluorescent switch ratio. According to the light control type AIE-effect fluorescent molecular switch, the limitation that traditional fluorescent chromophore leads to fluorescence quenching is broken; in addition, the fluorescent molecularswitch in solid and aggregation state has the advantages of being high in switch ratio and high in fluorescence quenching efficiency by being compared with the fluorescent molecular switch in solution state; the fluorescent molecular switch is applicable to information storage under solid state and photoelectric devices and has potential application in biosensing and fluorescence imaging.

The invention provides application of 3-(2-aminoethylamino)propyltrimethoxysilane to prepare ultra-bright fluorescent silicon quantum dots. The novel silicane molecule 3-(2-aminoethylamino)propyltrimethoxysilane is applied to prepare silicon quantum dots, and the prepared silicon quantum dots have the advantages of high quantum-dot yield (about 80%), high purity, good stability, good water solubility, pH response property, surface chemical paintability, low cell toxicity, synthesis simpleness and the like.

The invention relates to an electrochemical luminescence adapter sensor as well as a preparation method and the usage thereof, and in particular relates to an electrochemical luminescence adapter sensor established by taking Eu (III)-MWCNTs as luminescent material, a preparation method of the electrochemical luminescence adapter sensor, and the usage of the electrochemical luminescence adapter sensor prepared by the method in measurement of thrombin. The electrochemical luminescence adapter sensor has the advantages of excellent accuracy, stability and reproducibility and high sensitivity and has an important significance in the popularization of practical application of the adapter sensor in disease prevention, disease diagnosis and drug screening.

The invention relates to fields of biochemical analysis, and concretely relates to a homogeneous time-resolved fluorescence analysis method of alpha-fetalprotein. The method comprises the following steps: 1, preparing a quantitative standard curve: incubating an HFRFA energy receptor, an HFRFA energy donor and an alpha-fetalprotein standard substance together, and carrying out time-resolved fluorescence detection and analysis to obtain the standard curve between the concentration of the alpha-fetalprotein and the fluorescence value; and 2, detecting a sample: incubating the HFRFA energy receptor, the HFRFA energy donor and the alpha-fetalprotein sample to be detected together, carrying out time-resolved fluorescence detection and analysis, comparing the fluorescence value obtained through detecting the sample with the standard curve obtained in step 1, and calculating to obtain the concentration of the alpha-fetalprotein sample to be detected. The method of the invention, which has the advantages of strong specificity and high detection sensitivity, has important meanings in the biochemical analysis of clinical molecular diagnosis and food detection.

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.

The present invention discloses a visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst and a preparation method thereof. The preparation method comprises the steps of (1) preparing a suspension system A containing BiVO4 nano particles, and a suspension system B containing a TiO2 sol-gel and graphene oxide; (2) proportionally mixing up the suspension system A and the suspension system B, conducting the heating treatment, separating and drying to obtain a BiVO4/TiO2/graphene oxide composite material; (3) suspending the BiVO4/TiO2/graphene oxide composite material in short-chain alcohol, adding a reducing agent, conducting the hydrothermal reaction and drying to obtain the visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst. The preparation method is simple and easy to operate, and low in cost. Based on the preparation method, the structure and the properties of the composite light catalyst can be regulated and controlled through simply changing the conditions of reactions and heat treatments.

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.

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.

The invention discloses a preparation method of a water-soluble CdTe quantum dot, which includes: using cadmium salt as a cadmium source, tellurium dioxide as a tellurium source and sulfhydryl compound as stabilizer, and performing one-step preparation in a water phase system to directly synthetize high-fluorescence and water-soluble CdTe quantum dot. The preparation method has simple steps, used reagents are few, cost is low and the method is easy to implement. The whole production process meets the green and chemical requirements and is safe and environment-friendly. The prepared CdTe quantum dot has high quantum yield and high stability.

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.

The invention discloses antifog self-cleaning glass and a preparation method thereof. The antifog self-cleaning glass comprises a glass matrix and an antifog self-cleaning film on the glass matrix, wherein the antifog self-cleaning film is obtained by a dip-coating method and is preferably a transparent Fe<3+>/TiO2 film with thickness of 50-300nm; the Fe<3+>/TiO2 film is obtained by doping nano alpha-Fe2O3 in TiO2; the molar ratio of Fe to Ti is (1.05-1.25):100. The preparation method comprises the steps of firstly adopting a sol-gel method to prepare titanium alkoxide gel and then coating the titanium alkoxide gel on the surface of the clean glass matrix by the dip-coating method to form the uniform and transparent Fe<3+>/TiO2 film, thus obtaining the antifog self-cleaning glass. The antifog self-cleaning glass has higher photocatalytic activity, superstrong hydrophilicity, bactericidal ability and antifog and self-cleaning abilities, is ecologically and has environment-friendly effect and has good usability and wide application range.

The invention discloses fluorescence amino carbon quantum dots, and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing aqua ammonia with purified xylan, and stirring until the xylan is dispersed in the solution; (2) transferring the mixture into a reaction kettle, putting in a sealed muffle furnace, and carrying out hydrothermal treatment; (3) cooling the product to room temperature, and carrying out ultrasonic dispersion treatment; (4) carrying out refrigerated centrifugal separation on the treated product, removing the precipitate, and collecting the supernate to obtain a fluorescence amino carbon quantum dot water solution; and (5) concentrating the product water solution by rotary evaporation, and finally, carrying out vacuum drying to obtain the fluorescence amino carbon quantum dots. The amino carbon quantum dots have the advantages of high fluorescence, high stability, low cytotoxicity and favorable biocompatibility, and can be widely used in the fields of cell imaging, disease diagnosis, drug transfer and the like.

Meso-substituted porphyrins of general formula (I) suitable for the use as photosensitising agents, in particular in photodynamnic therapy, are herein described.

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.

The invention relates to a method for covalently bonding an organic metal complex to a polymeric matrix. The method comprises the performance of a first reaction, which comprises a first reactant in the form of an organic metal complex and a second reactant in the form of a polymer, where during the reaction the metal complex is covalently bound to the polymer. According to the invention, the metal complex catalyzes the reaction.

The invention provides an indium phosphide quantum dot with a core-shell structure as well as a preparation method and application thereof. The surface of an indium phosphide quantum dot is coated with a zinc sulfide shell layer doped with heteroatoms to form the indium phosphide quantum dot with the core-shell structure with an indium phosphide quantum dot core and a shell layer comprising compounds such as ZnMnS, ZnMgS or ZnSeS, so that the lattice mismatch degree of the quantum dot at a core-shell interface is appropriate, a forbidden band width is wider; at an excitation state, excitons generated at the core of the quantum dot obtained by the method are completely limited to the core and are difficult to migrate to the surface of the quantum dot, and the non-radiation recombination occurs at the surface defect state, thereby remarkably improving the quantum yield of the quantum dots; and the quantum yield of the quantum dot obtained by the method reaches up to 93 percent, an emission peak position is adjustable in a visible light range, and the application potential as a substitute product of traditional semiconductor quantum dot is high.

The invention relates to a method for doping of different-valence metal ions in a semiconductor, and belongs to the field of green preparation of semiconductor nano-materials and photoelectric performance regulation. The method comprises the steps that oleic acid and oleylamine are added to nano-particle sol of a chalcogen compound MxXy of different-valence metal M, and stirring is carried out evenly to obtain a mixture a; a methanol solution of cadmium salt is then added to the mixture a, and stirring is carried out evenly to obtain a mixture b; phosphine ligand is added to the mixture b, stirring and reaction are carried out at 30 DEG C to 80 DEG C for two hours to four hours, washing and centrifuging are carried out to obtain sediment c, the obtained sediment c is dispersed in a non-polarity organic solvent, and a different-valence doped semiconductor is obtained. The method is simple in operation, effective substituting doping of the different-valence metal ions in the semiconductor photoelectric nano-materials is achieved in the solvent at low temperature, the luminance on the semiconductor nano-materials and regulation of p-type and n-type conduction types are achieved, and application fields are wide.