982 results about "Oleylamine" patented technology

The invention discloses a high-yield preparing method for inorganic halogen perovskite fluorescent quantum dots at the room temperature. The fluorescent quantum dots are CsPbX3, wherein X is equal to AxB1-x and is larger than or equal to 0 and smaller than or equal to 1, and A and B are any one of Cl, Br and I. The method comprises the following steps that firstly, lead halide and cesium halide are dissolved into dimethyl formamide, surfactant oleylamine and oleic acid are added, the mixture is stirred until complete dissolution, and a precursor solution is obtained; secondly, the precursor solution is dripped into a poor solvent at the speed of 0.08-0.13 mL / s and stirred evenly at the uniform speed, and the inorganic halogen perovskite fluorescent quantum dots CsPbX3 are obtained. The preparing method is implemented at the room temperature, protection gas is not needed, equipment is simple, mass production can be achieved, and full visible light band shining can be achieved by selecting halogen and adjusting the proportion of halogen. The full width at half maximum of the inorganic halogen perovskite fluorescent quantum dots prepared through the preparing method ranges from 16 nm to 39 nm, the fluorescence quantum efficiency is close to 90%, and the inorganic halogen perovskite fluorescent quantum dots can be stably stored for more than three months, and can be used in the field of solar cells, lasers, light detectors, light-emitting diodes and the like.

The invention discloses a preparation method of copper nanoparticles with different particle diameters and relates to a metal nanoparticle. The invention provides a preparation method of copper nanoparticles with different particle diameters, which has simple, economic, environment-friendly process. The preparation method comprises the following steps: adding metal salt of copper chloride or copper acetate, a solvent, a protective agent, a complexing agent and a surfactant in a vessel in sequence, and stirring to obtain a mixture, wherein the protective agent is polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, or the like, the complexing agent is oleic acid, hexadecylamine, oleamide, or the like, and the surfactant is hexadecyl dimethyl ammonium bromide, sodium dodecyl benzene sulfonate or the like; adding a reducing agent in the mixture for reacting, wherein the reducing agent is ascorbic acid, sodium formaldehyde sulphoxylate, sodium borohydride, or the like; cooling the reactant till the temperature is below 40 DEG C, then adding a precipitating agent, mixing, and centrifugally separating; then washing with the organic solvent, centrifugating, and extracting the precipitate; and then drying the precipitate to obtain red powder copper nanoparticles with different particle diameters.

The invention relates to a preparation method for a controllable duplex metal alloy nano particle. The metal alloy nano particles is a Pt / Pd-M alloy nano particle, wherein the M is selected from Ni, Fe, Co, Mn, Pd, Zn, Cu and Mo; during preparation, n-butyllithium is used as a strong reducing agent and oleylamine and tri-n-octylphosphine are used as protective agents to reduce acetylacetone, chlorate or acetate of the Pt / Pd-M (M= Ni, Fe, Co, Mn, Pd, Zn, Cu,Mo) at the same time so as to form the uniform and size-controllable Pt / Pd-M alloy nano particle without a concentration gradient. The preparation method is simple and controllable in preparation technology, and can solve the problem that when precursor reduction potentials of two metals are greatly different, one metal can be reduced in prior, so that the alloy nano particle can not be obtained easily, provides a better and universal synthetic method for the preparation of the duplex metal alloy nano particle, and provides a key precursor for the preparation of a new generation of metal-oxide nano hybridization body catalyst used for selective hydrogenation reaction.

The invention discloses a preparation method for a doping type four-element multicolor fluorescent Ag-N-In-S quantum dot. The preparation method comprises the following steps: (1) adding AgNO3, InCl3, ZnCl2, oleic acid, dodecyl mercaptan and a solvent--octadecene into a reaction vessel so as to obtain an Ag, In and Zn mixed precursor solution; (2) adding powdered sulfur into oleylamine and carrying out heating to allow the powdered sulfur to be fully dissolved so as to obtain an S precursor solution; (3) heating the Ag, In and Zn mixed precursor solution to a temperature of 50 to 70 DEG C from room temperature and maintaining the temperature for 10 to 30 min under the protection of argon so as to remove air, then heating to a temperature of 150 to 200 DEG C, carrying out stabilization for 1 to 5 min and then injecting the S precursor solution, wherein a mol ratio of In to S is controlled to be 0.125-0.25: 1, and a reaction lasts for 5 to 90 min; (4) taking a sample and dissolving the sample in a hexane solvent so as to obtain an Ag-N-In-S quantum dot solution; and (5) adding absolute ethyl alcohol into the Ag-N-In-S quantum dot solution obtained in step (4) and carrying out centrifugation so as to obtain the Ag-N-In-S quantum dot. The preparation method provided by the invention is simple and convenient, and Ag-N-In-S quantum dots with different emitting colors can be obtained by doping zinc and controlling doping concentration of zinc.

The invention relates to a copper sulfide / mesoporous silicon dioxide core-shell nano material as well as a preparation method and an application thereof. The chemical formula of the core-shell nano material is Cu9S5 / mSiO2-PEG. The preparation method comprises the following steps of: (1) raising the temperature of oleylamine under the protection of nitrogen; adding a mixed solution of copper dibutyldithiocarbamate and the oleylamine and dispersing the mixed solution into chloroform to prepare a D solution; (2) dissolving a surfactant into water; raising the temperature and adding the D solution to prepare an E solution; and (3) taking the E solution and adding ethanol; raising the temperature and adding an NaOH solution; immediately adding TEOS (Tetraethylorthosilicate) and reacting; adding PEG-silane; continually reacting and carrying out hydrothermal reaction; and adding into a scrubbing solution to centrifuge and wash to obtain the product. The copper sulfide / mesoporous silicon dioxide core-shell nano material is applied to near-infrared photo-thermal treatment, anti-cancer drugs, chemotherapy of tumors and infrared heat imaging. The nano material disclosed by the invention has very low cell toxicity and very high blood compatibility; and the united effects of thermal therapy and the chemotherapy are good.

The invention relates to a method for preparing a magnetic nanosheet. During ball milling, solid particles and a surface active agent are added to assist ball milling. The solid particles adopt NaCl, CaCl2, NdCl3, KF, CaF2, NdF3, DyF3, Al2O3, Nd2O3 or random combinations thereof. The surface active agent adopts a cationic, anionic, or non-ionic surface active agent including but not limited to oleic acid, oleylamine and the like. During ball milling, the solid particles work with the surface active agent to stop a nanosheet from being further cold welded and reunited, so that magnetic particles are further crushed, and an ultrathin magnetic nanosheet with a texture is prepared. The thickness of the nanosheet ranges from 10 to 50 nm, and the average thickness is about 20 nm. The magnetic nanosheet with a texture or magnetic anisotropy is used for preparing a high-performance permanent magnet, or for a high-performance soft / hard magnetic coupling magnet and a double (multi) principal phase hard magnetic coupling magnet, or in microwave absorption and the preparation of magnetic refrigeration materials.

The invention provides a preparation method of perovskite quantum dots. The preparation method comprises steps as follows: A), Cs2CO3, oleic acid and octadecene are mixed and subjected to a heating reaction under the condition of protective atmosphere, and a cesium oleate precursor solution is obtained; B), lead halide and octadecene are mixed and subjected to heating and heat preservation under the condition of protective atmosphere, after an oleic acid and oleylamine mixed solution is added and heated to 170-190 DEG C, an obtained mixed solution is mixed and reacts with the cesium oleate precursor solution, and the perovskite quantum dots are obtained, wherein the lead halide is selected from one or more of lead chloride, lead bromide and lead iodide. According to the preparation method, the coordination effect of surface ligands of the perovskite quantum dots of different halide ions directly synthesized at a higher temperature is more remarkable, so that stability and fluorescence quantum efficiency of the synthesized perovskite quantum dots are both guaranteed.

The invention discloses the preparation method of low cost cadmium selenide (CdSe) / cadmium sulphide (CdS) / zinc sulphide (ZnS) quantum point. The invention is characterized in that ethide xanthic acid cadmium and ethide xanthic acid zinc are adopted to be respectively dissolved in the mixed solvent of oleic amine and oleic acid, as well as cadmium stearate and zinc stearate; as the front dirking liquid of clads CdS and ZnS of a SdSe quantum point, the invention is slowly dropped into the mixed liquor of octadecene and octadecylamine dissolved with CdSe quantum point, so as to obtain CdSe / CdS / ZnS quantum points. The invention has the advantages that the price of the raw material is cheap, the toxicity is low, the operation is simple, and the mass synthesis is proper.

The invention discloses an organic solvent-water heating method for preparing football-shaped mesoporous BiVO4, comprising the following experimental steps: under the condition of stirring, bismuth nitrate and ammonium metavanadate are dissolved in a mixed solution of ethanol, ethylene glycol, nitric acid and laurylamine (oleylamine or mixed liquid of oleylamine and oleic acid); a sodium hydroxide (2mol / L) alcohol solution of ethanol and ethylene glycol with the volume ratio of 1 to 1 is used to regulate the pH of the solution to be equal to 1.5-3; the mixed solution is transferred in a stainless steel self-pressing vessel (the volume filling degree is about 70%) with a Teflon inner liner and is put in an incubator to carry out organic solvent - water heating treatment for 12h in constant temperature of 100 DEG C; and the mixed solution is naturally cooled to room temperature after taking out. The obtained product after the organic solvent - water heating treatment is filtered, is washed with deionized water and absolute ethanol and is dried for 12h at the temperature of 60 DEG C, and then football-shaped mesoporous BiVO4 micron particles with a monoclinic scheelite structure is obtained. The porous bismuth vanadate obtained by the method has good application prospects in the fields of photocatalysis, electrode materials, pigments, ion conductive ceramic, and the like.

The invention discloses a preparation method for gold magnetic composite nanometer particles. Firstly, magnetic nanometer particles of Fe3O4 are prepared by using a chemical co-precipitation method, the surface of the magnetic particles are modified by a silane coupling agent, then with the modified nanometer particles of Fe3O4 as seeds and oil amine as a reduction agent, gold ions are reduced to metallic gold on the surface of the magnetic nanometer particles in an ultrasonic condition, then the nanometer particles are prepared. The nanometer particles have the advantages of good dispersion, strong magnetic response and having double bonds that can lead to polymerization reaction on the surface of the particles. The nanometer particles have the diameter of 30 to 50nm and saturation magnetization of 6.8 to 17.6 emu per gram, thus showing super paramagnetism. The nanometer particles not only have magnetic response function, but also can carry out polymerization reaction with a plurality of functional monomers, thus having wide application prospect in a plurality of fields, targeted drug control and release, hyperthermia, isolation of protein and enzyme, etc.

A tin based anode material for a rechargeable battery comprises nanoparticles of composition SnMxOy wherein M is a further element selected from the group 5 consisting of Ni, Cu, In, Al, Ge, Pb, Bi, Sb, Fe, Co, Ga, with 0≦x≦0.5 and 0≦y≦2+2x. The nanoparticles form a substantially monodisperse ensemble with an average size not exceeding 30 nm and a size deviation not exceeding 15%, the nanoparticles optionally being coated with a capping species. A method for preparing the tin based anode material is carried out in situ in a non-aqueous solvent and starts by reacting a tin salt and an organometallic amide reactant and oleylamine.

The invention discloses a method for preparing mononuclear AgInS2 quantum dots, comprising the following steps of: (1) adding AgNO3, InCl3, oleic acid, dodecyl mercaptan and solvent octadecene in a reaction container, to obtain an Ag and In precursor mixed liquor; (2) adding sulfur powder into oleylamine, and heating until the sulfur powder is fully dissolved, to obtain an S precursor solution; (3) under protection of argon, heating the Ag and In precursor mixed liquor from room temperature to 50-80 DEG C, and maintaining for 10-60min, in order to discharging air; and then raising temperature to 100-120 DEG C, maintaining for 1-5min, and injecting the S solution, wherein a mol ratio of Ag to S is 1:2, and reaction time is 5-90min; (4) sampling, and dissolving a sample into hexane, to obtain a AgInS2 quantum dot solution; and (5) adding waterless ethanol into the AgInS2 quantum dot solution obtained in the step (4), and centrifugally separating to obtain the mononuclear AgInS2 quantum dots. The method of the invention further raises fluorescent quantum yield of the mononuclear AgInS2 quantum dots prepared by a thermal injection method, in order to reach practical application requirement.

The invention relates to preparation and application of a full-inorganic perovskite quantum dot / mesoporous MOF-5 composite luminescent material in an LED (Light-emitting Diode). The full-inorganic perovskite quantum dot / mesoporous MOF-5 composite luminescent material is prepared through the steps of adding zinc nitrate hexahydrate, terephthalic acid, CTAB (Cetyltrimethyl Ammonium Bromide) and TMB(Tetramethylbenzidine) into DMF (Dimethyl Formamide), reacting, vacuum drying a resultant, and obtaining a mesoporous MOF-5 crystal; dissolving cesium carbonate into octadecene and oleic acid, and obtaining a cesium oleic acid solution; dissolving lead halide into octadecene, oleic acid and oleylamine, and obtaining a reaction solution; injecting the cesium oleic acid solution, quickly cooling, centrifuging, obtaining a perovskite quantum dot, dissolving in normal hexane, and obtaining a perovskite quantum dot normal hexane solution; vacuum drying the mesoporous MOF-5 crystal, and adding the perovskite quantum dot normal hexane solution; filtering, precipitating, vacuum drying, and obtaining the full-inorganic perovskite quantum dot / mesoporous MOF-5 composite luminescent material. The composite luminescent material is mixed with an ultraviolet curing adhesive so as to drip and be coated on a blue-light LED chip, and ultraviolet curing is carried out. According to the preparation method, the stability and the ion exchange resistance of the perovskite quantum dot are improved.

The invention discloses a method for preparing room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal. The method is characterized by comprising the steps that alide amine is introduced on the basis of conventional room temperature synthesis of the inorganic perovskite nanocrystal, a polymeric pecursor solution in which the alide amine has been added is added into a polar solvent, and the CsPbX3 (X=Cl, Br, I or other mixtures) inorganic perovskite nanocrystal. Alide amine is prepared by adding NH4X into oleylamine and performing degassing for 1 h in the atmosphere of inert gas at 100 DEG C. The method has the advantages that according to room temperature halogen-enriched synthesis, the fluorescence quantum efficiency and stability are high, the method is simple, and the room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal can be produced in a large scale. Compared with the CsPbX3 nanocrystal synthesized in a conventional method, the halogen-enriched synthesized CsPbX3 inorganic perovskite nanocrystal shows excellent optical property, high fluorescence quantum efficiency is still shown after purification many times and is 3-4.3 times the fluorescence quantum efficiency in the conventional method, and the application prospect of the method is improved.

The present invention discloses a method for preparing an electrode material molybdate for a super capacitor and the application thereof. The method comprises the steps of dissolving cobalt salt or nickel salt and sodium molybdate in a solution formed by water and oleylamine, carrying out hydrothermal reaction, carrying out centrifugation, washing and drying processing, carrying out calcinations under an inert atmosphere, and carrying out grinding to obtain powder to obtain a carbon-coated molybdate super capacitor electrode material. The carbon-coated cobalt molybdate or nickel molybdate electrode material prepared by the preparation method is applied to the super capacitor, and the method has the advantages of simple synthesis process, good repeated performance and mass production.

The invention discloses a preparation method of RGD-modified ultra-small magnetic iron oxide nanoparticles. The preparation method comprises the following steps: preparing ultra-small magnetic iron oxide nanoparticles by taking ferric acetylacetonate as a reaction raw material and a precursor, taking oleylamine as a surfactant and a reducing agent and taking dibenzyl ether as a solvent; replacing oleylamine molecules wrapped on the surfaces of the nanoparticles by utilizing dopamine-modified HOOC-PEG-COOH to realize PEG-modification of the surfaces of the nanoparticles; and finally, chemically coupling RGD cyclic peptide by virtue of free carboxyl at the tail end of the PEG to obtain the RGD-modified ultra-small magnetic iron oxide nanoparticles. The method of synthesizing the ultra-small magnetic iron oxide nanoparticles has the characteristics of a simple process, a high raw material conversion ratio, strong repeatability and the like. The synthesized magnetic iron oxide nanoparticles have the characteristics of a regular morphology, an ultra-small dimension, good stability, good monodispersity, high biocompatibility, and tumor specific targeting, and the like, and can be used as a T1-weighted imaging high-performance magnetic resonance imaging contrast agent with a tumor active targeting function.

The invention relates to a method for preparing multi-shape controllable nano nikel-cobalt spinel oxide. The method includes the steps that nickel nitrate and cobalt nitrate are dissolved in anhydrous ethanol according to the cobalt-nickel atom ratio to form a solution A; oleylamine is dispersed in an ethanol solution to form a solution B, and the solution B and the solution A are mixed to obtain a mixed solution; the mixed solution is fully and evenly stirred and moved into a dynamic reaction kettle, H2 is replaced in a sealed mode, pressure intensity of H2 is adjusted to 6-15 bar after replacement, and a steel cylinder air outlet valve is closed; the stirring speed of the dynamic reaction kettle is adjusted to 400 r / min, temperature is set to be 150 DEG C, and reaction is carried out for 10 h; a product is cleaned through ethanol and other nonpolar solvents respectively, centrifugal separation is carried out, and a sediment precursor is obtained through drying at the temperature of 60 DEG C; the temperature of the obtained sediment precursor rises in an air atmosphere at the speed of 10 DEG C / min, and the sediment precursor is heated to 200-400 DEG C and kept warm. According to the method, procedures are few, materials are easy to get and low in price, the procedures are safe, nikel-cobalt spinel oxide of different shapes can be obtained by changing a small condition in the procedures, and accordingly preparing of the controllable nano nikel-cobalt spinel oxide is achieved.

The invention relates to a hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and a preparation method thereof. The technical scheme is that: the HAWSP oil displacement agent comprises the following monomers and monomers in percentage by mass: 53.5 to 59.9 percent of acrylamide (AM), 40 to 45 percent of sodium acrylate (NaAA) and 0.1 to 1.5 percent of N-allyl oleylamine (NAO); and the preparation method comprises the following steps of: adding the NAO into a reactor; adding OP-10 and water; adding the AM, AA and NaOH after emulsification is performed completely to prepare a solution with the monomer total mass percentage concentration of 10 to 25 percent; adjusting the pH value to 7.5 to 11; introducing N2 for 20 minutes; adding an initiator; continuously introducing N2 for 20 minutes; reacting at the temperature of between 30 and 70 DEG C for 4 to 12 hours; washing by using absolute ethanol; and crushing and drying to prepare AM / NaAA / NAO terpolymer. The polymer has water solubility and high temperature tolerance, salt tolerance and shearing resistance, and can increase a crude oil recovery rate by over 10 percent simulatively.

The invention discloses a method for synthesizing copper-indium-selenium nanocrystalline and relates to a solar cell material. The invention provides a method for synthesizing copper-indium-selenium nanocrystalline with simple technological steps. The method comprises the following steps: mixing dodecyl mercaptan and oleyl amine to obtain a mixed solvent; adding an elementary substance selenium, and dispersing to obtain an evenly dispersed elementary substance solution; adding cuprous chloride and indium chloride into an oleic acid-octadecylene mixed solvent, heating while stirring, vacuumizing, so that the vacuum degree of the system is lower than -0.1 MPa, and introducing nitrogen to obtain an oleic acid-octadecylene composition of cupric salts and indium salts in the nitrogen atmosphere, wherein the oleic acid-octadecylene composition of cupric salts and indium salts is a light-brown transparent solution; and injecting the prepared selenium solution into the oleic acid-octadecylene composition of cupric salts and indium salts, heating to carry out the reaction, centrifugating to obtain a precipitate, and respectively washing the precipitate with methenyl chloride and ethanol at least once to obtain the copper-indium-selenium nanocrystalline.

The invention discloses a Cu3BiS3 ternary sulfur nano material and a preparation method thereof, belonging to the field of inorganic nano materials. The Cu3BiS3 ternary sulfur nano material is nano particles which are prepared by adopting a high-temperature pyrolysis method by taking oleic acid, oleylamine and octadecene as reaction solvents, Cu(NO3)2.3H2O and Bi(NO3)3.5H2O as raw materials and sodium diethyldithiocarbamate as a complexing agent and a sulfur source. The Cu3BiS3 nano particles have better absorbability in an ultraviolet / visible light area, and are proved to have a good photo-thermal effect; besides, the Cu3BiS3 ternary sulfur nano particles can be used for performing CT (computed tomography) imaging, so that the nano particles can be well applied in the field of biomedicine. Moreover, the preparation method of the Cu3BiS3 ternary sulfur nano material has many advantages of simple operation, low raw material cost, availability and the like, and is suitable for industrial production and application.

The invention discloses a supported palladium catalyst and a preparation method and application thereof. The supported palladium catalyst disclosed by the invention comprises a graphene carrier and palladium nano-crystals or palladium nano-alloys supported on the carrier, wherein the palladium nano-crystals or palladium nano-alloys account for 10-50 mass percent. The preparation method comprises the following steps: (1) dissolving palladium salt in oleylamine to obtain a palladium salt solution, or dissolving cobalt salt or nickel salt and palladium salt in oleylamine to obtain a mixed solution; (2) adding a boron-nitrogen compound into the palladium salt solution or the mixed solution, and adding an organic settling agent, thereby obtaining the palladium nano-crystals or palladium nano-alloys; and (3) supporting the palladium nano-crystals or palladium nano-alloys on graphene, thereby obtaining the supported palladium catalyst. The supported palladium catalyst and the preparation method disclosed by the invention have the advantages that the preparation method is low in reaction temperature and is simple and convenient, and the shape and size of the palladium catalyst can be controlled. Moreover, the active ingredients of the supported palladium catalyst disclosed by the invention are uniform in size and high in dispersity, and the catalyst is high in activity and can be used for catalyzing formic acid oxidation.

The invention discloses a preparation method of a Cu-Zn-In-S quantum dot luminescent thin film. The preparation method comprises the following steps: (1) adding cuprous chloride, indium chloride, zinc salt, a capping agent and a surface coating agent to a non-polar high boiling point organic solvent so as to obtain a Cu, In and Zn mixed precursor solution, stirring and heating under the atmosphere of nitrogen or inert gas so as to form a clear transparent solution; (2) adding an oleylamine solution of sulfur to the clear transparent solution obtained in the step (1), and heating for reacting so as to prepare a Cu-Zn-In-S quantum dot solution; (3) separating so as to obtain Cu-Zn-In-S quantum dots; (4) mixing the prepared Cu-Zn-In-S quantum dots with a component A of an LED (Light Emitting Diode) pouring sealant; (5) uniformly mixing a component B of the LED pouring sealant with a mixture obtained in the step (4), removing air bubbles, then coating a product on a glass substrate, and curing at a room temperature so as to obtain the Cu-Zn-In-S quantum dot luminescent thin film. The fluorescence spectra of the Cu-Zn-In-S quantum dot luminescent thin film prepared by the method can be adjusted. The Cu-Zn-In-S quantum dot luminescent thin film has the excellent fluorescence property of the Cu-Zn-In-S quantum dots and the good machining property of an organic silicon adhesive AB.

The invention discloses I-II-III-VI family quantum dots and a preparation method thereof, belonging to the technical field of preparation of a semiconductor nanomaterial. The quantum dots are specifically shown as (CumAg1-m)aZnb(InnGa1-n)cSd; the molar ratio of a copper element to a silver element in an I family is (1-m):m; m is more than or equal to 0 and less than or equal to 1; the molar ratio of an indium element to a gallium element in an III family is (1-n):n; and n is more than or equal to 0 and less than or equal to 1. The preparation method comprises the following steps of: dissolving cationic monomers and ligands of Cu or / and Ag, Zn, In or / and Ga in a non-coordinated solvent to obtain a ligand-cationic monomer complex compound; heating the ligand-cationic monomer complex compound and injecting an anionic monomer of S which is dissolvable in oleyl amine to obtain the quantum dots; and precipitating in acetone or ethanol and dispersing into a chloroform or hexane solvent. The quantum dots disclosed by the invention have very high quantum efficiency, excellent monodispersity, excellent stability and controllable particle composition; the sizes of particles do not need to be selected; and the preparation method is easy to operate and has low cost.

The invention discloses a red and green light perovskite quantum dot stable fluorescent powder based on SiO2 coating and a preparation method thereof and belongs to the field of luminescent materials;the method includes: 1) mixing, stirring and heating oleic acid, octadecene and Cs2CO3 to prepare a cesium oleate precursor solution; 2) with lead halide, oleylamine, oleic acid, and octadecene beingraw materials, heating and stirring the raw materials in a nitrogen atmosphere to prepare a lead halide precursor solution; 3) heating the lead halide precursor solution to a high temperature and injecting the cesium oleate precursor solution, and rapidly cooling the mixture to prepare a crude product of the perovskite quantum dots; 4) centrifuging and dispersing the crude product in n-hexane toobtain pure colloidal quantum dots, and adding metered (3-aminopropyl)triethoxysilane (APTES, similarly hereinafter) and mixing and stirring all the components to prepare the quantum dot stable fluorescent powder. The quantum dot stable fluorescent powder has high luminous efficiency and high color purity, has narrow emission peaks at 637 nm and 522 nm; after the SiO2 coating, the product is relatively stable.

The invention relates to a preparation method of perovskite type nanocrystalline. The perovskite type nanocrystalline is CsPbXY, wherein X is selected from any one of Cl, Br or I; Y is selected from any one of Cl, Br or I; X is different from Y; a is greater than or equal to 0, b is greater than or equal to 0, and a+b=3. The method comprises the steps that cesium salt, long-chain olefin and oleic acid are mixed; under the inert gas protection, heating reaction is performed to obtain an oleic acid cesium solution; PbO, ammonium halide and long-chain olefin are mixed; then, oleylamine and oleic acid are injected; heating is performed; the oleic acid cesium solution is injected under the inert gas protection; reaction and cooling are performed to obtain the CsPbXY perovskite type nanocrystalline. When the method is used for synthesizing the perovskite type nanocrystalline, the types and the proportion of halogen can be regulated and controlled; the performance of the perovskite type nanocrystalline is controlled; the method is simple; the photoelectric conversion performance of the synthesized perovskite type nanocrystalline is good; meanwhile, the synthetic raw materials use low-toxicity PbO; green and environment-friendly effects are achieved.

The invention provides a method for preparing luminescent band gap tunable double-light emitting manganese-doping perovskite nano-crystal, and belongs to the technical field of material preparation. The method comprises: firstly mixing cesium carbonate, oleic acid, and octadecene, obtaining a cesium oleate precursor solution; mixing lead bromide, oleylamine, oleic acid and octadecene, obtaining alead bromide precursor solution; mixing lead chloride, manganese chloride, and octadecene, obtaining a first mixed solution; adding oleylamine, oleic acid, and tri-n-octylphosphine to the first mixedsolution, obtaining a second mixed solution; adding the cesium oleate precursor solution to the second mixed solution, to obtain Mn:CsPbCl3 nano-crystal solution; injecting the lead bromide precursorsolution to the Mn:CsPbCl3 nano-crystal solution, and stirring, preparing Mn:CsPbCl3-xBrx nano-crystals, wherein X is greater than 0 but less than 3. By adopting the method provided by the invention,the luminescent band gap of the manganese-doping perovskite nanocrystals and continuous tuning of the corresponding illuminating color are realized through anion exchange.

The invention discloses a method for preparing CsPbX3 perovskite quantum dots rapidly and simply at room temperature. The method comprises the following steps of: a) dissolving cesium hydroxide, a lead source and a halogen-ammonium source in an anhydrous ethanol solvent according to a molar ratio of 1:1:3, adding a slightly-excessive amount of oleic-acid oleylamine as a surface active agent according to equimolar negative and positive ions, slightly stirring for completely dissolving the oleic-acid oleylamine to obtain a precursor; b) transferring a precursor solution into organic solvents such as methyl benzene, stirring for completely reaction of the mixture, and thus obtaining the CsPbX3 perovskite quantum dots at the room temperature. The method for preparing the CsPbX3 perovskite quantum dots rapidly and simply at the room temperature disclosed by the invention has the advantages that the anhydrous ethanol is adopted as a polar solvent, simultaneously the cesium hydroxide, lead oleate and tetraoctyl ammonium halide with easier dissolution are adopted to replace CsX and PbX2, and the traditional solvents such as DMF (Dimethyl Formamide) with larger toxicity are replaced, so that the synthetic stability of the CsPbX3 perovskite quantum dots is better; due to room-temperature operation, the method is lower in cost and more convenient in operation, is more environmentally friendly and is suitable for large-scale batch production.

The invention relates to a dendritic platinum-palladium alloy nanometer catalyst as well as a preparation method and application thereof. A structural formula of the dendritic platinum-palladium alloy nanometer catalyst is PtxPd100-x, and x is not less than 0 and not more than 100; the dendritic platinum-palladium alloy nanometer catalyst is prepared from platinum pentanedionate and palladium pentanedionate in an oleylamine solution under conditions of a temperature of 50-90 DEG C and the presence of H2. The dendritic platinum-palladium alloy nanometer catalyst is used for hydrogenation reduction of a methanol fuel cell anode catalyst and a nitrocompound. The dendritic platinum-palladium alloy nanometer catalyst shows a relatively strong poisoning resistance and relatively high electric catalysis stability in a process of an electric catalytic oxidation of a methane solution with a certain concentration, can realize the hydrogenation reduction of the nitrocompound at a low temperature and a normal pressure, has a dormant advantage especially for the hydrogenation reduction of polynitro compounds, and can be used for effectively reducing the energy consumption.

The invention relates to a preparation method of a bicolor fluorescent semiconductor nanomaterial based on Mn-doped CuInS2 / ZnS. The preparation method comprises the following steps: (1) preparing CuInS2 / ZnS quantum dots, purifying the CuInS2 / ZnS quantum dots and then dissolving the CuInS2 / ZnS quantum dots in n-hexane; (2) adding the CuInS2 / ZnS quantum dots obtained by the step (1) into octadecene (ODE), heating to 150 DEG C under an argon gas environment, injecting a mixed solution of Mn(Ac)2 (manganese acetate) and oleylamine and maintaining for 1 hour at the 150 DEG C; then heating to 240 DEG C, injecting the mixed solution of Zn(Ac)2, oleic acid / DDT (Dichloro-Diphenyl-Trichloromethane) and the ODE and reacting for 1 hour at 240 DEG C; and cooling to a room temperature, thereby obtaining the quantum dot nanomaterial of CuInS2 and ZnS: Mn / ZnS. The quantum dot nanomaterial can be used for replacing yellow fluorescent powder to be prepared into a white LED (Light Emitting Diode). The Mn-doped CuInS2 / ZnS quantum dots are of a nanomaterial which is nontoxic and environment-friendly, and has two fluorescence peak positions within a visible light range, wherein the peak positions are between 525nm and 590nm or so; the relative strength of the two fluorescence peaks can be regulated by regulating the content of the Mn.

The invention discloses a cobalt oxide / carbon composite nano wave-absorbing material and a preparation method thereof and relates to a magnet / dielectric composite nano wave-absorbing material. The cobalt oxide / carbon composite nano wave-absorbing material has a core-shell structure, wherein the core is magnetic cobalt oxide; and the shell is a carbon layer. The preparation method comprises: adding a cobalt salt into a solvent, and after the cobalt salt is dissolved, filling the solution into a reaction kettle; placing the reaction kettle in an outer cover and heating the reaction kettle; after the reaction kettle cools naturally to room temperature, taking out supernatant liquor, carrying out centrifugal separation on lower precipitate, washing and drying the precipitate to obtain a flaky / flower-shaped cobalt hydroxide precursor; mixing the precursor and oleylamine in a quartz tube; after the precursor is dissolved, inserting the quartz tube in a tubular furnace to heat the quartz tube at a constant temperature for at least 20 minutes; and taking out the quartz tube, adding absolute ethanol, standing the mixture, carrying out centrifugal separation on the mixture, and washing and drying the precipitate to obtain the cobalt oxide / carbon magnet / dielectric composite nano wave-absorbing material.