338 results about "Octadecene" patented technology

A process of preparing an unsaturated alcohol (olefin alcohol), such as, a homo-allylic mono-alcohol or homo-allylic polyol, involving protecting a hydroxy-substituted unsaturated fatty acid or fatty acid ester, such as methyl ricinoleate, derived from a seed oil, to form a hydroxy-protected unsaturated fatty acid or fatty acid ester; homo-metathesizing or cross-metathesizing the hydroxy-protected unsaturated fatty acid or fatty acid ester to produce a product mixture containing a hydroxy-protected unsaturated metathesis product; and deprotecting the hydroxy-protected unsaturated metathesis product under conditions sufficient to prepare the unsaturated alcohol. Preferably, methyl ricinoleate is converted by cross-metathesis or homo-metathesis into the homo-allylic mono-alcohol 1-decene-4-ol or the homo-allylic polyol 9-octadecene-7,12-diol, respectively.

A cross-metathesis process for preparing an α,ω-functionalized olefin, such as methyl 9-decenoate, and an α-olefin having three or more carbon atoms, such as 1-decene. The process involves contacting in a first reaction zone an α-functionalized internal olefin, such as methyl oleate, and an α-olefinic monomer having three or more carbon atoms, such as 1-decene, with a first metathesis catalyst to prepare an effluent stream containing the α,ω-functionalized olefin, such as methyl 9-decenoate, an unfunctionalized internal olefin, such as 9-octadecene, unconverted reactant olefins, and optionally, an α,ω-difunctionalized internal olefinic dimer, such as dimethyl 9-octadecen-1,18-dioate; separating said effluent streams; then contacting in a second reaction zone the unfunctionalized internal olefin with ethylene in the presence of a second metathesis catalyst to obtain a second product effluent containing the α-olefinic monomer having three or more carbon atoms; and cycling a portion of the α-olefinic monomer stream(s) to the first zone.

A cross-metathesis process for preparing an α,ω-functionalized olefin, such as methyl 9-decenoate, and an α-olefin having three or more carbon atoms, such as 1-decene. The process involves contacting in a first reaction zone an α-functionalized internal olefin, such as methyl oleate, and an α-olefinic monomer having three or more carbon atoms, such as 1-decene, with a first metathesis catalyst to prepare an effluent stream containing the α,ω-functionalized olefin, such as methyl 9-decenoate, an unfunctionalized internal olefin, such as 9-octadecene, unconverted reactant olefins, and optionally, an α,ω-difunctionalized internal olefinic dimer, such as dimethyl 9-octadecen-1,18-dioate; separating said effluent streams; then contacting in a second reaction zone the unfunctionalized internal olefin with ethylene in the presence of a second metathesis catalyst to obtain a second product effluent containing the α-olefinic monomer having three or more carbon atoms; and cycling a portion of the α-olefinic monomer stream(s) to the first zone.

A process of preparing an unsaturated alcohol (olefin alcohol), such as, a homo-allylic mono-alcohol or homo-allylic polyol, involving protecting a hydroxy-substituted unsaturated fatty acid or fatty acid ester, such as methyl ricinoleate, derived from a seed oil, to form a hydroxy-protected unsaturated fatty acid or fatty acid ester; homo-metathesizing or cross-metathesizing the hydroxy-protected unsaturated fatty acid or fatty acid ester to produce a product mixture containing a hydroxy-protected unsaturated metathesis product; and deprotecting the hydroxy-protected unsaturated metathesis product under conditions sufficient to prepare the unsaturated alcohol. Preferably, methyl ricinoleate is converted by cross-metathesis or homo-metathesis into the homo-allylic mono-alcohol 1-decene-4-ol or the homo-allylic polyol 9-octadecene-7,12-diol, respectively.

The invention discloses a preparation method of stable lead-free all-inorganic double perovskite A2BB'X6 nanocrystals. The method adopts a thermal injection technology to synthesize the nanocrystals,and concretely comprises the following steps: mixing a metal precursor salt, a reaction solvent oleic acid, oleylamine, octadecene and other raw materials, carrying out vacuum heating and stirring ata certain temperature for a certain period of time, rising the temperature to a suitable reaction temperature under the protection of N2, rapidly injecting the obtained hot oleate solution of A into areaction system, and then rapidly cooling the system to room temperature by using ice bath to finally obtain the A2BB'X6 perovskite nanocrystals having a uniform size. The method has the advantages of simplicity, convenient, good reappearance and environmental protection, and the obtained product has the advantages of uniform size, good dispersion, high stability and excellent photocatalytic performance, and can be applied to the fields of photocatalysis, photodetectors, laser, solar cells and the like.

Quaternary ammonium, betaine, or sulfobetaine compositions derived from fatty amines, wherein the fatty amine is made by reducing the amide reaction product of a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives and a secondary amine, are disclosed. Quaternary ammonium, betaine, or sulfobetaine compositions derived from fatty amidoamines, wherein the amidoamine is made by reacting of a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives and an aminoalkyl-substituted tertiary amine, are also disclosed. The quaternized compositions are advantageously sulfonated or sulfated. In one aspect, the ester derivative of the C10-C17 monoun-saturated acid or octadecene-1,18-dioic acid is a lower alkyl ester. In other aspects, the ester derivative is a modified triglyceride made by self-metathesis of a natural oil or an unsaturated triglyceride made by cross-metathesis of a natural oil with an olefin. The quaternary ammonium, betaine, and sulfobetaine compositions and their sulfonated or sulfated derivatives are valuable for a wide variety of end uses, including cleaners, fabric treatment, hair conditioning, personal care (liquid cleansing products, conditioning bars, oral care products), antimicrobial compositions, agricultural uses, and oil field applications.

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 a method for preparing CsPbBr3 nanosheets with quantum size effects. The method includes dissolving cesium carbonate in oleic acid under argon filling conditions, and stirring the cesium carbonate and the oleic acid under heating conditions until the cesium carbonate is dissolved to obtain cesium oleate precursors; adding lead bromide, long-chain ligands and short-chain ligands into octadecene under argon filling conditions, carrying out reaction at the temperature of 100-150 DEG C until the lead bromide is dissolved, heating first reaction products until the temperature of the first reaction products reaches 120-150 DEG C, then injecting the cesium oleate precursors into the first reaction products, carrying out reaction for 5-15 s, then continuing to carry out reaction at the temperature of 100-130 DEG C for 1-5 min to obtain second reaction products and centrifuging the second reaction products. The method has the advantages that the transverse sizes of the CsPbBr3 nanosheets can be assuredly regulated and controlled in the range from 100 nm to 1 micrometer while the thicknesses which are equal to the thicknesses of a few atomic layers can be guaranteed; the thicknesses which are lower than the diameters of Bohr excitons can be kept, and accordingly the quantum size effects of the CsPbBr3 nanosheets can be reserved.

The invention discloses Fe@Fe3O4 nanoparticles having a photothermal function, and a preparation method and an application thereof, and belongs to the field of medical science materials. The preparation method is significantly characterized by comprising: firstly, utilizing octadecene as a solvent, utilizing Fe(CO)5 as an iron source, utilizing oleyl amine as a surfactant and a stabilizer, and preparing an Fe nanomaterial having good dispersity by high temperature pyrolysis; sequentially, adding (CH3)3NO at the high temperature for oxidization to form one layer of Fe3O4 shell on the surface layer of each Fe nanoparticle, and then improving water solubility by a ligand exchange method to obtain the Fe@Fe3O4 composite material as a photothermal reagent and having high magnetization strength. The composite material has the advantages of uniform particle size, high saturation magnetization strength, and controllable morphology, and has excellent dispersion and excellent stability in aqueous solution. The reaction time is short, the raw materials are easy to get, and operation processes are convenient. On the basis of the raw materials, the Fe@Fe3O4 nanoparticles are developed to connect PEG to the surface of the material, so that the Fe@Fe3O4 nanoparticles can be applied to biological bodies. The invention provides the application of the Fe@Fe3O4 nanoparticles in the field of tumor photothermal therapy.

The invention discloses a preparation method of a surfactant for a photo-reduction method of a Ag / TiO2 nano heterogenous junction by virtue of induction. The preparation method comprises the following steps of: 1) dispersing 0.1-1.0g of TiO2 nano crystal taking 0.1-0.5ml of oleic acid, oil amine or 1-octadecene as surfactant into 50ml of chloroform, stirring to be uniform, so as to obtain TiO2 nano crystal dispersion; 2) taking 0.2-0.5g of AgNO3 and dissolving AgNO3 into 10ml of ethanol, adding the TiO2 nano crystal dispersion, stirring to be uniform, then transferring mixed solution into a three-opening flask, degassing for 20-60min with argon, sealing, and carrying out photo-reduction synthesis for 30-90min under the conditions of stirring and taking an xenon lamp as a light source, thus the Ag / TiO2 nano heterogenous junction is obtained. By applying the preparation method disclosed by the invention, novel photocatalysis material with low cost and high efficiency and other photoelectric functional materials are hopeful to be developed. The synthetic method disclosed by the invention is also effective when being used for preparing a more complex functional nano structure.

Alkoxylated fatty ester compositions are disclosed. In one aspect, the compositions comprise a reaction product of a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives with one or more alkylene oxides in the presence of an insertion catalyst to give an alkoxylated fatty ester. In another aspect, the metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or its ester derivative is reacted with a glycol ether or a glycol ether alkoxylate, to give an alkoxylated fatty ester. In yet another aspect, the metathesis-derived C10-C17 monounsaturated acid or octadecene-1,18-dioic acid is reacted with one or more alkylene oxides to give a fatty acid alkoxylate, followed by etherification of the fatty acid alkoxylate.

The invention discloses a method for controlling light wavelength of full-inorganic perovskite quantum dots. PbBr2 and octadecene are mixed and a mixed solution I is obtained; oleylamine and oleic acid are added to the mixed solution I in an inert environment, and a mixed solution II is obtained; the reaction temperature is increased to 120-160 DEG C, a caesium precursor solution is quickly added to the mixed solution II, the temperature is kept for 5 s, quantum dots are dispersed in a solvent, and a CsPbBr3 quantum dot solution is obtained; the CsPbBr3 quantum dot solution is dropped and applied to a silicon substrate cleaned in advance, and a film sample is formed; the film sample is placed in a vacuum device to be heated, and the light wavelength of full-inorganic perovskite quantum dots is controlled. The method is simple to operate, the size of the CsPbBr3 quantum dots can be changed after heat treatment, and the light wavelength is adjustable.

The invention belongs to the technical field of semiconductor nanocrystallines and relates to a method for preparing an oil soluble semiconductor nanocrystalline with high quality. The method comprises the following steps of: preparing a selenium precursor by reducing and dissolving selenium powder in aliphatic amine by using alkyl sulfhydryl; and preparing the oil soluble semiconductor nanocrystalline with high quality by using the selenium precursor. During the preparation process, used raw materials comprise a metal source (a cadmium source, a copper source, a zinc source, a tin source, an indium source and a gallium source), the selenium powder, the aliphatic amine, the alkyl sulfhydryl and octadecene. The selenium precursor is prepared by reducing the selenium powder with the alkyl sulfhydryl, the alkyl sulfhydryl is low in price, and harmless and environment-friendly, and can stably exist in air, and the reaction of reducing the selenium powder with the alkyl sulfhydryl can be finished in the air, so the method reduces the cost for preparing the nanocrystalline effectively, is environment-friendly and is very suitable for industrial production.

The invention provides a preparation method of an ultrasmall NaYF4:Yb<3+>,Er<3+> upconversion nanoparticle luminescent material, which comprises the following steps: a) lowering the upconversion nanoparticle size by lowering the rare earth acetate concentration in the reactants or regulating the contents of oleic acid and 1-octadecene; and b) controlling the nucleating and crystallizing process by the repeated oscillation design of reaction temperature, thereby further lowering the upconversion nanoparticle size. The ultrasmall NaYF4:Yb<3+>,Er<3+> upconversion nanoparticles prepared by the method have the advantages of small size (9-18nm), uniform particle size distribution and high luminescence efficiency, and are a hexagonal phase; and the preparation method has very high repeatability and favorable application prospects.

The invention provides a Nd<3+> sensitized core-shell upconversion nanocrystal material, and a preparation method and application thereof in water detection. The developed Nd<3+> sensitized core-shell upconversion nanocrystal material can effectively detect the water content in organic solvent. The upconversion nanocrystal provided by the invention is prepared by taking oleic acid and octadecene as solvent and rare earth chloride as a reactant through a coprecipitation method, and is then subjected to surface treatment by means of HCl. The nanocrystal material has the advantages of high detection convenience, high accuracy, favorable chemical stability and the like. The obtained product is regular in shape, uniform in size and narrow in particle size distribution. The invention combines Nd<3+> sensitization and core-shell structure design to realize the multimode excitation of the upconversion nanocrystal. The Nd<3+> sensitization design favorably overcomes an overheating effect caused by exciting light in a water detection process. Hopefully, the nanocrystal material is widely used in the fields of chemical industry production and biological lesion detection.

Aqueous hard surface cleaner compositions derived from metathesized natural oil feedstocks are disclosed. In one aspect, the compositions comprise at least one anionic surfactant derived from a metathesis-derived C10-C17 monounsaturated acid, 5 octadecene-1,18-dioic acid, or their ester derivatives. In another aspect, aqueous hard surface cleaners comprising at least one nonionic or amphoteric surfactant derived from a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives are disclosed. The aqueous cleaners noted above rival or outperform commercial baselines in a Gardner straight-line washability test. Industrial degreasers comprising a C10 or C12 amide solvent and derived from a metathesis-derived C10-C17 monounsaturated acid are superior to commercial standards.

The invention discloses a method for synthesizing a totally inorganic CsPbX3 perovskite nano-crystal. X refers to Cl, Br or I, and a phase transfer agent does not need to be added. The method comprises the following specific steps: adding a precursor into octadecene dissolved with oleic acid and oleylamine, and heating to the temperature of 110-160 DEG C while stirring; cooling with ice water, and adding ethyl acetate for precipitating; and finally, performing solid-liquid separation to remove the supernatant, thereby obtaining the product, wherein a volume ratio of octadecene to oleic acid to oleylamine is (8-12):(0.8-1.2):(0.8-1.2). According to the synthetic method disclosed by the invention, the CsPbX3 nano-crystal is synthesized in one step through direct heating, nitrogen protection and any polar solvent are not needed, the problem that the previous two methods are poor in reproducibility is solved, and the method has excellent application prospects.

The invention relates to perovskite quantum dot gel and a preparation method thereof. The method comprises the following steps of mixing octadecene and PbX2 (0.138g of PbBr2 in green quantum dots, 0.105g of PbI2 and 0.052g of PbBr2 in red quantum dots), degassing in vacuum, heating at 120 DEG C for an hour, and putting the ODE and PbX2 mixture into a nitrogen environment; adding oleic acid and APTES, adding cesium oleate prepared in the step a at 145 DEG C, cooling to room temperature, stirring and hydrolyzing so as to form a silicon dioxide-coated perovskite quantum dot sol solution; and drying to obtain the silicon dioxide-coated perovskite quantum dot gel. The prepared perovskite quantum dot gel has good transparency and flexibility and high quantum yield, and the long-term stability can be kept in a protonic solvent.

The invention relates to a preparation method of a copper-based nano solar battery material, which belongs to the preparation technique of semiconductor nano solar battery materials. A metallic compound is taken as a precursor, mercaptan, elemental sulfur, elemental selenium and the like as sulfur raw materials, and oleylamine, oleic acid, 1-octadecene and TOPO (Tri-Octyl-Phosphine Oxide) as a main high-boiling-point solvent. By adopting a thermal decomposition method, the copper-based nano solar battery material which is different in morphology, good in crystallinity degree, good in monodispersity, controllable in phase structure and adjustable in optical property is prepared under unharsh reaction condition, thus basis is established for application and industrial production of the high-quality nano copper-based solar material in the aspects of solar battery preparation and photocatalyst design. The copper-based nano solar battery material has the characteristics of controllable product property, high quality, simple production process, environmental-friendliness and the like, and is easy to industry.

Sulfonate compositions are disclosed. The compositions include alkanesulfonates, alkenesulfonates, sultones, and hydroxy-substituted alkanesulfonates. The sulfonates comprise a reaction product of a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives with a sulfonating or sulfitating agent. In one aspect, the sulfonate composition is a sulfo-estolide made by reacting a metathesis-derived C10-C17 monounsaturated acid or octadecene-1,18-dioic acid with a sulfonating agent, optionally in the presence of a saturated fatty acid. The sulfonates are valuable for a wide variety of end uses, including cleaners, fabric treatment, hair conditioning, personal care (liquid cleansing products, conditioning bars, oral care products), paint additives, antimicrobial compositions, agricultural uses, and oil field applications.

The invention belongs to the field of luminescent materials, and discloses a red green and blue three-basic-color fluorescent composite material and a preparation method and application thereof. The method comprises the following steps: (1) adding a molecular sieve in a cesium halide solution, stirring, centrifuging, washing, drying, calcining, cooling and repeating the steps to obtain an ion exchanged molecular sieve; (2) taking octadecene, oleic acid, oleylamine and lead halide as raw materials, vacuumizing, heating and stirring to obtain a lead halide solution; and (3) adding the ion exchanged molecular sieve in the step (1) in the lead halide solution in the step (2), stirring and heating, cooling, centrifuging and washing, and drying to obtain the red green and blue three-basic-color fluorescent composite material. The prepared red green and blue three-basic-color fluorescent composite material is good in luminous efficiency and high in color purity, and has good emission peaks at 583 nm, 518 nm and 410 nm respectively; and quantum dots still have excellent optical property in a solid state. The composite material can be used in the field of white light LED and screening.

The invention discloses a manganese oxide nanoparticle contrast agent for specifically targeting brain glioma. The manganese oxide nanoparticle contrast agent is prepared by the following steps: dispersing an inorganic manganese compound and sodium oleate into a mixed liquor of ethanol, water and normal hexane, and reacting at 50-70 DEG C to prepare precursor manganese oleate; dissolving the manganese oleate precursor into 1-octadecene, and stirring at 80-100 DEG C under protection of nitrogen; heating to 280-320 DEG C under protection of nitrogen, and refluxing to obtain oleic acid-encapsulated manganese oxide nanoparticles; dispersing the oleic acid-encapsulated manganese oxide nanoparticles into methylbenzene; adding a little of acetic acid, carrying out ultrasonic treatment, and adding a silylating reagent to react, so as to obtain silylanized manganese oxide nanoparticles; dispersing the manganese oxide nanoparticles into deionized water, and bonding specifically targeted molecules of the brain glioma, so as to obtain the manganese oxide nanoparticles for specifically targeting the brain glioma. The manganese oxide nanoparticles disclosed by the invention can be used as a novel nuclear magnetic resonance imaging (MRI) contrast agent for early diagnosis and boundary definition of the brain glioma.

The invention belongs to the field of materials, and specifically relates to a perovskite nanosheet material as well as a preparation method and application thereof. The preparation method of the perovskite nanosheet material comprises the following steps: (1) mixing cesium carbonate powder with octadecene and oleic acid, dissolving the cesium carbonate powder by heating to 100-130 DEG C under aninert atmosphere, rising the temperature of a system to 140-160 DEG C and reacting for 10-60 min to obtain a cesium oleic acid precursor; mixing iron bromide power with octadecene, oleic acid and oleylamine, dissolving, then adding lead bromide power into an obtained mixed solution, and dissolving the lead bromide powder by heating to 100-120 DEG C under an inert atmosphere so as to obtain an ironand lead mixed solution; and (2) heating the cesium oleic acid precursor to 80-100 DEG C, uniformly mixing with the iron and lead mixed solution, performing a thermal insulation reaction for 5 s-5 min at 120-140 DEG C, cooling and then performing centrifugal separation. Therefore, the obtained perovskite nanosheet material has relatively short light-emitting wavelength; the light-emitting peak position is at about 436 nm; the half peak width is only 14 nm; the light-emitting peak is fully symmetric; and the two-dimensional perovskite nanosheet material is very uniform in size and thickness, and is easy to control.

The invention relates to a method for preparing monodisperse zinc oxide ultrathin nanosheets, belonging to the field of inorganic nanometer material preparation technologies. The method comprises the steps of: by taking zinc acetate as a precursor, taking oleic acid as a surfactant and taking high-boiling point organic reagents such as oleylamine and 1-octadecene as solvents, adding a mineralizer, carrying out N2 protection, and magnetically stirring and heating under a temperature of 270-290 DEG C for 30-60min to prepare zinc oxide ultrathin nanosheets with various shapes such as strip shape and circular shape, wherein the thickness is 1.1nm. The method is simple in process, short in reaction period, adjustable and uniform in shapes, and free of high-temperature thermal treatment. The prepared ZnO nanosheets have relatively large specific surface area and have wide application prospect in the field of photocatalysis, solar cells, photoelectronic devices, sensors and the like.

The invention provides a preparation method of a polyhedral copper nanoparticle, and belongs to the technical field of nanometer materials. According to the preparation method provided by the invention, the powdered copper oxide is taken as the copper source, the oleic acid is used as the ligand, and the octadecene is used as a solvent, and oleylamine serving as a reducing agent is poured into the mixture at 240 to 250 DEG C, thus obtaining the copper nanoparticle; and the copper nanoparticle with different shapes and dimensions can be obtained by controlling the reaction time. Compared with existing method, the preparation method of polyhedral copper nanoparticle provided by the invention adopts the powdered copper oxide as the raw material because the powdered copper oxide is low in cost and has high stability in the air; the polyhedral copper nanoparticle manufactured by the method has good stability on ligand protection, and excellent catalyzing performance after being diffused in the water; and the preparation method has the advantages that the time of synthesis is short, high repeatability is achieved, and a sample has high crystallinity, and the uniformity in particle size distribution is ensured.

The invention discloses a preparing method of low poisonous ZnSe quantum point in the luminous material technology domain, which comprises the following steps: preparing zinc priority solution through ZnO, geoceric acid and octadecene in the nitrogen condition; preparing selenium reserving liquid through selenium powder, tripositive octyl phosphine and octadecene in the sealing container; adding tripositive octyl phosphine oxide and hexadecylamine in the zinc priority solution; injecting the selenium reserving liquid rapidly in the nitrogen condition; cooling to prepare ZnSe quantum point.

Fatty amine compositions made from a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives are disclosed. In another aspect, fatty amidoamines made by reacting a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives with an aminoalkyl-substituted tertiary amine are disclosed. The fatty amines or amidoamines are advantageously sulfonated, sulfitated, oxidized, or reduced. In other aspects, the ester derivative is a modified triglyceride made by self-metathesis of a natural oil or an unsaturated triglyceride made by cross-metathesis of a natural oil with an olefin.

The invention discloses a preparation method of novel high-efficient luminescence Mn-doped quantum dots. The method comprises the following steps: adding powdered sulfur to 1-octadecene, and mixing to obtain a sulfur pecursor solution; adding Zn salt, In salt, a dopant Mn salt and an organic coating agent to the 1-octadecene, and heating to obtain a transparent solution; and heating the transparent solution under a protective gas, mixing with the sulfur pecursor solution, and reacting to obtain Mn:Zn-In-S bared quantum dots. ZnS shell layers wrap the surfaces Mn:Zn-In-S bared quantum dots obtained by the method; the optical property of the quantum dots can be effectively improved; and the fluorescent lifetime of the quantum dots can be prolonged. The synthesis condition provided by the invention is simple, safe, and uniform in particle size distribution, does not contain heavy metal elements such as Cd and Se; the fluorescence quantum efficiencies are 56%; the fluorescent lifetime is 4.8ms; and the Mn-doped quantum dots obtained by the method have excellent heat-resistant stability, can bear hot weather fastness of 200 DEG C, and show an attractive application prospect in the aspects such as photoelectronic devices and biological fluorescence labels.

The invention relates to a preparation method of a small-size high-stability perovskite nanocrystalline Cs4PbBr6, and belongs to the technical field of preparation of semiconductor nanomaterials. Thepreparation method comprises the following steps: firstly injecting a caesium carboxylate solution into a lead bromide solution at the temperature of 140 DEG C to 200 DEG C under the protection of N2,reacting, synthesizing a perovskite nano-block CsPbBr3 with the size of 3.8 nm to 11.8 nm, purifying the perovskite nano-block CsPbBr3, dispersing the perovskite nano-block CsPbBr3 by using octadecene, raising the temperature to 25 DEG C to 120 DEG C, injecting an ammonium bromide solution, reacting for 3-8 minutes, then centrifuging and purifying to obtain a nanoparticle Cs4PbBr6. The preparation method has the characteristics of easy operation, simple steps and rapid reaction, the raw materials are easy to get, the prepared particles Cs4PbBr6 are uniform in size, regular in morphology and excellent in stability, and the particle keeps unchanged even after a stock solution is placed in the air for a month.

The invention discloses a method for preparing a quantum dot of a transitional metal chalcogenide compound and belongs to the field of preparing functional nanomaterials by colloidal chemical methods. The method disclosed by the invention comprises the following steps: mixing a metal carbonyl compound and trioctylphosphine oxide, heating and dissolving the mixture as a metal source precusor, by taking octadecene as a reaction solvent, heating the mixture under inert gas protection to reaction temperature, and preparing a metal source reaction system; by taking organic phosphorus as a coorinating solvent, preparing non-metal source sulfur powder, selenium powder or tellurium powder into a precusor solution; injecting the non-metal source solution into the metal source reaction system under inert gas protection and maintaining the reaction temperature and carrying out a heating reaction; and carrying out high speed centrifugal separation, and adding a mixed solution of n-butylamine / n-hexane into the obtained solid product to obtain a quantum dot material of the transitional metal chalcogenide compound in a collide dispersing state. The preparation method for the quantum dot material of the transitional metal chalcogenide compound disclosed by the invention is good in universality, fast in reaction speed, high in reaction yield, simple to operate, mild in reaction condition and easy for large-scaled production.