124results about How to "Components are easy to control" patented technology

The invention provides a multi-element composite nano-material for a super capacitor, and a preparation method of the nano-material. The nano-material comprises a carbon material, metal oxide and conducting polymer, and components of the nano-material can be two or more than two materials. By the aid of the characteristics such as fine electrical conductivity, long cycle life and high specific surface area of the carbon material, high pseudo-capacitance of the metal oxide and low internal resistance, low cost and high operating voltage of the conducting polymer, different types of electrode materials generate synergistic effects, advantages are mutually combined, shortcomings are mutually weakened, the energy storage characteristics of an electric double-layer capacitor and a pseudo-capacitor are simultaneously made full use of, a composite electrode material with high power density, fine circulating stability and higher energy density is prepared, and the multi-element composite nano-material is excellent in comprehensive performance when used for an electrode of the super capacitor, has the advantages of simple preparation process, short cycle, low cost and the like, and is suitable for large-scale industrial production.

The invention relates to an alkali soil fluoride contained nanometer crystal transparent glass ceramic and the manufacture method for sol-gel. The chemical constituents are xSiO2-yMF2-zErF3, x=50-95mol%, y=(100-x-z) mol%, z=0-10mol%, and M is alkali metal Ba or Sr. Under excitation of infrared (wavelength at 978nm) and near ultraviolet (wavelength at 378nm), the glass ceramic would emit green light of wavelength at 525nm and 540nm, and red light of wavelength at 660nm.

The invention relates to a method for preparing an oxidized graphene / conductive polypyrrole nano wire composite material. The method comprises the following steps of: preparing oxidized graphene by using natural graphite according to a chemical oxidization method, uniformly dispersing the oxidized graphene into deionized water by adopting an ultrasonic method to obtain a stable oxidized graphene suspension; adding hexadecyl trimethyl ammonium bromide with the mole concentration being 0.025 to 0.038 mol / L into the oxidized graphene suspension, uniformly stirring and mixing, adding pyrrole into the suspension, and uniformly mixing and stirring; polymerizing pyrrole monomers on an oxidized graphene nano sheet in situ by taking the hexadecyl trimethyl ammonium bromide as a surface active agent and ammonium persulfate as an oxidant, and performing frequent washing, suction filtration and vacuum drying on a product to finally obtain the oxidized graphene / conductive polypyrrole nano wire composite material. According to the preparation method, the process is simple, and the cost is low; and the product is high in specific capacity and high stability. The method can be applied to fields such as lithium ion batteries, sensors, electronic devices and fuel batteries.

The invention provides a preparation method of a hybridization solar battery for a perovskite-like sensitized photoanode. The preparation method includes the following steps that a thin film with a thickness of a submicron and made of wide bandgap semiconductor oxide nano materials is manufactured on a transparent conductive substrate at first, then at least one of lead halide PbC12 or PbBr2 or PbI2 is deposited in the thin film by means of an ion exchange method, and finally deposited lead halide reacts with organic halogenated ammonium salt through an impregnation method to generate organic and inorganic perovskite in the thin film in situ to obtain the perovskite-like sensitized photoanode. According to the preparation method, components, grain diameters, thicknesses and other key parameters of the organic and inorganic perovskite can be conveniently controlled, and thus spectral response wave bands and photoelectric performance of the organic and inorganic perovskite can be controlled.

The invention discloses a rare earth doped bismuth titanate up-conversion luminescence ferroelectric film and a preparation method thereof. The rare earth doped bismuth titanate up-conversion luminescence ferroelectric film has the molecular formula of (Bi4-x-yErxYby)Ti3O12, wherein 0<x<=0.85, 0<y<=0.85, and 0<x+y<=0.85. The invention adopts a chemical solution-deposition method to prepare (Bi4-x-yErxYby)Ti3O12 films, the film components are easily controlled, the operation is convenient, and the invention is convenient for scale production. Besides good ferroelectric, dielectric and optical transmittance properties, the (Bi4-x-yErxYby)Ti3O12 film further has efficiently enhanced up-conversion luminescence property, is a novel important multifunctional film material, and has wide application prospect in the field of photoelectric material.

The invention relates to a preparation method of Mg-RE-Ni alloy hydrogen storage material, comprising the following steps: (1) mixing Mg powder, RE powder and Ni powder in percentage by molar of 60-89:1-10:10-30, and evenly grinding powder in the atmosphere of argon protection to obtain mixture; (2) tabletting the mixture under the argon protection, and sealing by graphite powder; (3) putting a sealed die in a tube furnace or a muffle furnace under argon or air atmosphere for sintering powder, and obtaining sintered alloy; (4) polishing the surface of the sintered alloy, and obtaining alloy powder by smashing and grinding; and (5) carrying out intermittent ball milling on the alloy powder under the argon protection to obtain nanocrystalline / amorphous magnesium base composite hydrogen storage material. The invention combines a powder sintering method with a mechanical ball milling method, which simplifies technology, leads operation to be easier, lowers equipment cost and ensures that the component of the obtained production is easy to control.

The invention belongs to the technical field of material surface chemical coating, in particular relating to a preparation method of a photoassisted sol-gel of a yttrium doped zinc oxide transparent conductive film. In the invention, the sol-gel is prepared by adopting a photoassisted sol-gel method and a hierarchic annealing method, and taking zinc acetic acid and yttrium nitric acid as raw materials, ethylene glycol monoemethyl ether as a solvent, and ethanolamine as a stabilizer; and by regulating the doping amount of the yttrium, controlling the temperature and the time of drying and annealing, and irradiating by ultraviolet, the control on the electricity performance of the yttrium doped zinc oxide transparent conductive film is achieved. In the invention, the prepared yttrium doped zinc oxide transparent conductive film has the resistivity within 2.1*10<-2> omega.cm to 8.1*10<-2> omega.cm, the light transmission ratio (including substrate) of a visible light area is more than 85%; in addition, the film consists of zinc oxide nano-crystals with a hexagonal wurtzite structure, wherein the crystal sizes are even, and the crystals are arranged compactly and have C-axis preferable growth orientation.

The present invention relates to a design and preparation method for a novel calcium-magnesium-silicon multiphase bioactive ceramic, and a use thereof. According to the present invention, chemical compositions of three novel calcium-magnesium-silicon multiphase bioactive ceramics are firstly designed based on preliminary experimental results and theoretical analysis of phase diagrams; then tetraethoxysilane, water, magnesium nitrate hexahydrate and calcium nitrate tetrahydrate are adopted as raw materials, a sol-gel method is adopted for synthesis of three novel calcium-magnesium-silicon multiphase bioactive ceramic powders; the powders are subjected to dry-pressing and forming to obtain a material bisque; the bisque is subjected to sintering for 2 hours at a temperature of 1300-1350 DEG C to obtain a compact ceramic block body. According to the present invention, the multiphase ceramic MC2 is prepared by the method provided by the present invention, wherein the thermal expansion coefficient of the multiphase ceramic MC2 matches with titanium alloy TC4; because the intrinsic stress between the metal and the ceramic is reduced, the metal-ceramic bonding strength can be improved when the multiphase ceramic MC2 is adopted as the titanium-based bioactive coating; the ceramic has good mechanical property, good biological activity and good osteoblast compatibility; the novel calcium-magnesium-silicon multiphase ceramic MC2 is a potential bioactive ceramic material, and can be used in the surface modification fields of titanium implants in orthopedics, dentistry or plastic surgery, and human body hard tissue repairing and implanting materials; the method provided by the present invention has characteristics of simple process, easily-controlled components and conditions, and is easy to popularize.

The invention relates to a nuclear shell type long-acting antibacterial emulsion. The nuclear shell type long-acting antibacterial emulsion comprises the following raw material components: water, n-butyl acrylate, isobutyl acrylate, isooctyl acrylate, styrene, methyl methacrylate, vinyl acetate, guanidinium oligomer macromonomers, an emulsifying agent, an initiating agent, a cross-linking agent and sodium bicarbonate. The preparation method comprises the following steps: preparing each raw material component; adding water, the emulsifying agent and isooctyl acrylate into a reactor, stirring, heating to 60-70 DEG C, adding the initiating agent to initiate reaction, and after the emulsion becomes blue, maintaining for 60-120 minutes, so as to obtain a nuclear layer emulsion; maintaining the temperature at 70-80 DEG C, adding n-butyl acrylate, heating to 81-85 DEG C, maintaining the temperature, cooling, and discharging, so as to obtain the nuclear shell type long-acting antibacterial emulsion. According to the preparation method, guanidinium and guazatine oligomers are taken as antibacterial functional groups, and guanidyl serves as a main antimicrobial group, has an obvious antibacterial effect and is very safe to human bodies. The preparation method for the nuclear shell type long-acting antibacterial emulsion is simple, rapid, environmentally friendly and suitable for industrial production, and the operation is easy.

The present invention relates to a preparation method of dimension-controllable CsPbX3 perovskite nanometer crystals, and belongs to the technical field of preparation of a semiconductor nanomaterial.The method comprises: firstly, adding a cesium carboxylate solution to a lead bromide solution in N2 protection for a reaction, thereby obtaining CsPbBr3 perovskite nanometer crystal seeds; then, dispersing CsPbBr3 perovskite nanometer crystal seeds in hexane, injecting the obtained product to octadecene at different temperature to obtain CsPbBr3 perovskite nanometer crystals with different sizes; and finally, dispersing CsPbBr3 perovskite nanometer crystals in hexane, and gradually adding a lead chloride solution or a lead iodide solution drop by drop for a reaction to obtain other CsPbX3 (X=Cl, Ir) perovskite nanometer crystals. The method is simple to operate, the size of products is easy to adjust, and the components are controllable.

The invention relates to the technical field of wave-absorbing materials, in particular to a preparation method of a silicon carbide / carbon hollow porous microsphere wave-absorbing material. The invention aims to solve the technical problems of large particle size and easy agglomeration of silicon carbide particles in the silicon carbide / carbon composite material prepared by the existing method. The method includes: mixing deionized water, anhydrous ethanol and ammonia water, adding a surfactant, resorcinol, a silicon source and a formaldehyde solution, stirring the substances uniformly at room temperature, then adding melamine, performing stirring, transferring the mixture into a high-temperature and high-pressure reactor for reaction, and conducting high temperature calcination; and thenperforming mixing with magnesium powder, conducting high temperature calcination in a nitrogen atmosphere, washing off redundant magnesium powder with hydrochloric acid, and carrying out washing anddrying. The silicon carbide / carbon hollow porous microsphere obtained by the method has good chemical homogeneity and large specific surface area, and can effectively avoid agglomeration and sinteringof silicon carbide particles. The material prepared by the method provided by the invention is used for making light and efficient wave-absorbing coatings.

This invention relates to a method for preparation of refractory active metals or alloys, which comprises the following steps: selecting CaCl2 or mixed salt electrolyte mainly including CaCl2 as flux, coining or perfusing refractory active metals to be block-shaped, sintering them to get sintered cake, compounding sintered cake and liquid of conductive cathode group and making them as cathode, making graphite or inert electrode as anode; making electrolyzation voltage no lower than academic decomposition voltage of melted salt, and making electrochemical reduction carryed out on cathode, but not forming compact sedimentary deposit to prevent the touch of compounds and electrolyte, controlling electrolyzation temperature at 500-1000 degrees, controlling the electrolyzation time according to 1-4 times theoretical electrical energy demand, making sure inert atmosphere in electrolytic process; then getting refractory metals or alloys which is electrolyzation product. The invention has short flow of production, low energy consumption, little contamination, and is easy to product continuously.

The invention discloses a preparation method of perovskite single crystals. The perovskite single crystals are CsPbBr3 perovskite single crystals or CsPb2Br5 perovskite single crystals, and the perovskite single crystals are in the shape of sheet or rod. A preparation method comprises the following steps: cleaning a single crystal growth substrate, wherein respectively carrying out ultrasonic treatment on the substrate for 15-30 minutes with acetone, 70%-80% ethanol and deionized water, taking out the substrate, and drying the substrate in a drying oven overnight to obtain a single crystal growth substrate; preparing a perovskite precursor solution, wherein dissolving CsBr and PbBr2 in hydrobromic acid or dimethyl sulfoxide according to the proportion of 1 / 1-1 / 4, controlling the concentration of CsBr to be 0.06 mol / L to 0.3 mol / L, the concentration of PbBr2 to be 0.06 mol / L to 0.3 mol / L, and obtaining a perovskite precursor solution; and preparing the perovskite single crystals, namelypreheating the perovskite precursor solution to 80-95 DEG C, dripping the perovskite precursor solution on the substrate, and removing the solvent to obtain the perovskite single crystals. The methodis simple to operate and low in operation process difficulty, and the components and morphology of the perovskite single crystals are adjustable.

This invention relates to a method for preparing TiO2 / polyaniline nanofiber hybrid material. The hybrid material is composite nanoparticles composed of 20-70 wt. % one-dimensional TiO2 nanorods and polyaniline nanofibers. The hybrid material is prepared by combination of template-induced polymerization and hydrothermal method from TiO2 and aniline with HCl as the dopant, ammonium persulfate as the initiator, and poly (vinyl pyrrolidone) as the surfactant. The ratio of polyaniline to ammonium persulfate is 4:1. The hybrid material has such advantages as high thermal stability, good mechanical properties, low cost, abundant and cheap raw materials, no toxicity, no harm, simple process, and controllable composition and properties.

The invention relates to the field of recovery and utilization of waste organic silicon contacts and especially relates to a ternary copper catalyst prepared from copper powder recovered from waste organic silicon contacts and a preparation method thereof. The preparation method comprises the following steps of 1, carrying out an extraction process on waste organic silicon contacts by an oxidizing acid or an oxidant-containing acid liquor at a temperature of 20 to 90 DEG C for 4 to 8 hours, and filtering to obtain a Cu<2+>-containing acid solution, 2, adding a reducing agent into the Cu<2+>-containing acid solution obtained by the step 1 so that Cu<2+> is reduced into copper powder, 3, oxidizing a part of the copper powder obtained by the step 2 to obtain a complex of copper oxide, cuprous oxide and copper, and 4, carrying out ball-milling of the complex of copper oxide, cuprous oxide and copper to obtain the ternary copper catalyst having a particle size of 0.5 to 10 microns. The preparation method saves a copper catalyst production cost and realizes recycle of a copper catalyst used in an organic silicon industry. The ternary copper catalyst obtained by the preparation method has obvious environmental protection benefits and catalytic effects better than catalytic effects of commercial catalysts.

The invention relates to a universal preparation method for synthesizing a carbon-coated nickel metal compound with various morphologies as a sodium ion battery negative electrode material by utilizing a metal organic framework design. The method comprises the following steps: dissolving an organic ligand, a nickel source and a surface dispersant into a mixed solvent according to a certain ratio,and controlling hydrothermal reaction time to generate nickel-containing metal organic frameworks with different morphologies (solid spheres, core-shell spheres and hollow spheres); the carbon-coatednickel-containing compounds (nickel oxide, nickel phosphide, nickel sulfide, nickel selenide and nickel telluride) with the shape similar to that of a template are synthesized by taking the frameworksas the template and adjusting an anionic ligand and utilizing an ion exchange strategy. The preparation method has the advantages that the morphology is adjustable; the components are rich; conditions are easy to control; the operation is simple; the conversion efficiency is high; the synthesis method has universality and can be expanded to synthesis of other types of carbon-coated metal compounds; and the product has high specific capacity and good rate capability.

The invention belongs to the field of new material preparation technology, and provides a method for preparing a carbon-loaded nano high-entropy alloy particle composite material. The operation process is simple, and the production cost is reduced. The method is to prepare a carbon-loaded nano high-entropy alloy particle composite material with adjustable component and controllable size by using ahigh-temperature reduction metal complex polymerization precursor. The specific method is as follows: the metal complex polymerization reaction is used to obtaining an organic network precursor containing multiple metal ions; and the organic network precursor undergoes a high-temperature reduction reaction to obtain the carbon-loaded nano high-entropy alloy particle composite material with high purity and uniform dispersion of alloy particles. According to the invention, the composition of the high-entropy alloy can be adjusted through the selection of metal nitrate, and then the size of thenano high-entropy alloy can be controlled through the adjustment of the molar ratio of the metal salt and the organic polymer and the selection of the complexing agent.

The invention relates to a preparation method of a copper oxide-zinc oxide composite catalyst. The method comprises the following steps: soaking a carbon black template in a solution containing copper ions and zinc ions, drying the carbon black template with the copper ions and the zinc ions, and calcining to remove the carbon black template, thereby obtaining the copper oxide-zinc oxide composite catalyst. The copper oxide-zinc oxide composite catalyst provided by the invention takes carbon black as a template agent as the carbon black contains less impurities and is small in particle size, readily available and low in cost; and therefore, composite oxide nano particles with loose structure, smaller particle size and narrow particle size distribution range can be obtained. Meanwhile, the carbon black is easy to remove and cannot pollute the environment after being removed; and the preparation method is applicable to industrial production.

The invention discloses shell powder and chitosan composite microspheres for absorbing heavy metals, and a preparation method of the shell powder chitosan composite microspheres. In the composite microspheres, the weight ratio of chitosan powder to shell powder is equal to 1 to (0.3-0.45). The preparation method comprises the steps of soaking shell into acid, washing, drying, calcining, and grinding into coarse shell powder; crushing the coarse shell powder to obtain nano shell powder; carrying out liquid drop molding on the chitosan powder and the shell powder, then carrying out crosslinkingmodification, cleaning up, and drying to obtain composite microspheres; adding the composite microspheres into a solution containing thiourea and epoxy chloropropane, and carrying out a reaction to obtain a composite microsphere product. The shell powder and chitosan composite microspheres provided by the invention combines the advantages of the shell powder and chitosan; due to the addition of the shell powder, not only is the mechanical stability of a chitosan carrier improved, but the complexing capability between the carrier and transition metals can be also improved, and the recycling ofthe heavy metals can be further realized; the microspheres prepared by the preparation method provided by the invention have high monodispersity, and are controllable in particle sizes, morphology, particle diameters and components, uniform in particle diameters and high in mechanical strength.

The invention relates to a hydrophobic coating for controlling drug release and a preparation method thereof, belonging to the field of chemical materials and biological medicine. The hydrophobic coating comprises a drug layer and a combined layer which is formed by hydrophobic coatings variable with time, wherein the hydrophobic coatings variable with time are covered over the drug layer and have a structure of particles, beads or fibers, the size of particles in the particle structure is 50 nm to 5 mu m, the diameter of a single bead and fiber in the bead structure are 100 nm to 5 mu m and 50 nm to 2 mu m respectively, and the diameter of fiber in the fiber structure is 100 nm to 5 mu m. The preparation method is to fix a substrate with the drug layer, to control the concentration of each high molecular solution and to obtain the hydrophobic coating through the method of electrostatic spraying. When the hydrophobic coating variable with time provided in the invention is immersed in an aqueous solution, surface hydrophobicity of the coating changes with the increases of time, and therefore the rate that water molecules enter into and go out of the coating is regulated, thereby realizing further regulation of the drug release rate of a sustained release agent as a whole and satisfying clinical treatment requirements for surface dosing with medical instruments.

The invention discloses a preparation method of twenty-six-side CsPbX3 perovskite nanocrystalline, belonging to the technical field of semiconductor nano materials. The preparation method comprises the following steps: firstly, adding a carboxylic acid caesium solution into a lead bromide solution protected by N2, and carrying out reaction to obtain CsPbBr3 perovskite nanocrystalline seeds; then dispersing CsPbBr3 perovskite nanocrystalline seeds into octadecylene, adding octadecyl phosphoric acid, raising the temperature to preset temperature, and carrying out reaction to obtain CsPbBr3 perovskite nanocrystallines with different sizes and twenty-six sides in morphology, and finally, dispersing the CsPbBr3 perovskite nanocrystallines into normal hexane, and dropwise adding a lead chloridesolution or lead iodide solution, and carrying out reaction to obtain CsPbX3 (X=Cl, I, Cl / Br or I / Br) perovskite nanocrystalline with other components and twenty-six sides in morphology. The preparation method has the advantages of simple operation, easily adjustable product size, controllable components and the like.

The invention provides a method for preparing an alloy nanoparticle. The method utilizes good SPR properties and local heating ability of precious metal materials and heat insulation and original shape maintaining functions of SiO2 nano layers, so that different metal atoms in a multi-metal structure of a core-shell structure migrate to form the multi-metal alloy nanoparticle with constant morphology. The method uses sunlight or simulated sunlight as a light source without the need for other energy sources, the method is green, environmentally friendly and simple and quick to operate, completely alloyed nanoparticles of various morphologies can be prepared, and the prepared alloy nanoparticle has good dispersion performance, uniform size and excellent stability.

The invention discloses a P-type bismuth telluride thermoelectric material and a preparation method thereof. The preparation method includes the steps that Bi, Sb and Te simple substance powder servesas raw materials, ball milling is conducted, then plasma sintering is conducted, a block material is prepared, and the P-type bismuth telluride thermoelectric material is obtained. The preparation method has the characteristics of simple process, short production period and high production efficiency, and the prepared modulated bismuth telluride-based thermoelectric block material is high in purity, low in thermal conductivity, high in electrical conductivity and high in mechanical strength.

The invention discloses a calcium sulfate hemihydrate / octacalcium phosphate / carboxymethyl chitosan composite artificial bone material and a preparation method thereof. An injectable composite artificial bone material comprises a curing liquid and calcium sulfate hemihydrate / octacalcium phosphate / carboxymethyl chitosan composite powder, the curing liquid and the calcium sulfate hemihydrate / octacalcium phosphate / carboxymethyl chitosan composite powder are stored separately, the mass ratio of calcium sulfate hemihydrates to octacalcium phosphate to carboxymethyl chitosan is 1:0.01-0.5:0.01-0.1, the volume mass ratio of curing liquid to calcium sulfate hemihydrate / octacalcium phosphate / carboxymethyl chitosan composite powder is 0.3-1.0:1ml / g; and the curing liquid is an oxidized polysaccharide solution. Compared with various artificial bone materials in the prior art, the calcium sulfate hemihydrate / octacalcium phosphate / carboxymethyl chitosan composite artificial bone material has the advantages of simple preparation process, easy operation, good injection property and controllable composite material components, by compounding of traditional inorganic bone materials and a natural polymer material, defect part loss of in artificial bone injection initial stage can be prevented, and the calcium sulfate hemihydrate / octacalcium phosphate / carboxymethyl chitosan composite artificial bone material has the advantages of good mechanical strength, good biocompatibility and osteogenic properties, and controlled degradation.

The invention discloses a green preparation method of silicon carbide ceramic powder. Recycled sand extracted from cutting wastes of solar crystalline silicon wafers is used as a raw material, is subjected to flotation and ground, and is added with a dispersing and purifying reagent to achieve the purposes of improving dispersity of slurry and removing impurities, and therefore, the clean silicon carbide ceramic powder with high purity is prepared.

The invention discloses a multi-metal one-dimensional nano material, a preparation method and a catalyst, and the method comprises the following steps: adding soluble metal salt and hexadecyl trimethyl ammonium chloride into oleylamine, stirring for 5-30 minutes at room temperature, and carrying out ultrasonic treatment for 5-30 minutes; then adding molybdenum hexacarbonyl, reacting at 180 DEG C for 6-12 hours, finally naturally cooling to room temperature, washing with ethanol and n-hexane, and carrying out centrifugal treatment so as to obtain the multi-metal one-dimensional nano material, wherein the soluble metal salt comprises platinum acetylacetonate, and further comprises at least two of rhodium acetylacetonate, cobalt acetylacetonate and nickel acetylacetonate.

The invention discloses a preparation method for a Zr-doping CaCu3Ti4O12 ceramic material with a high dielectric constant and low dielectric loss by utilization of a sol-gel method, and belongs to the dielectric material synthesis technology field. The concrete method is as follows: a sol-gel method is employed, calcium nitrate, cupric nitrate, zirconium oxynitrate and butyl titanate are employed as raw materials, absolute ethyl alcohol is employed as a solvent, nitric acid is employed to adjust the pH of a solution, the raw materials are weighed according to chemical element mol ratios, sol is prepared and placed in a water-bath kettle, stirring is carried out continuously until xerogel is formed, organic matters are removed, CaCu3Ti4-xZrxO12 precursor powder is obtained, then calcining, crushing, grinding, sieving and granulation are carried out, then a ceramic body with a thickness of 1mm and with a diameter of 12mm is prepared, then the ceramic body is placed in a sintering furnace, sintering and thermal insulation are carried out, and finally a CaCu3Ti4-xZrxO12 ceramic sample can be obtained. The method is simple in technology and is easy for industrial production. The prepared ceramic sample has a high density, good particle uniformity and has an enough high dielectric constant and low dielectric loss.

The invention discloses a laser pulse deposition preparation method for a Cs2SnI6 thin film. The high-quality Cs2SnI6 thin film is obtained by synthesizing CsSnI3 powder through a solution method, obtaining a Cs2SnI6 target material through sintering under the atmosphere of I2, preparing a Cs2SnI6 precursor thin film through a pulse laser deposition (PLD) method and finally conducting annealing treatment on the prepared thin film. The method has multiple beneficial effects that components are controllable, the deposition rate is high, impurity contamination can be prevented, and low-temperature deposition of the high-quality compound thin film can be easily achieved, and the prepared Cs2SnI6 thin film is smooth and uniform in surface and adjustable in thickness, and has good stability in air. The thin film is high in quality and easy to operate and magnify, and technical support is provided for research and application of Cs2SnI6 novel photoelectric materials and devices.

The invention discloses a Fe3O4 / TiO2 nano magnetic composition and an in-situ growing preparation method thereof. The method includes the steps: firstly, preparing black nano Fe3O4 particles; and secondly, using an in-situ growing method to prepare nano TiO2 particles, namely dissolving titanyl organic matters into saltpeter solution, adding Fe3O4 particles, performing low-temperature liquid phase synthesis, and coating TiO2 on the surface of Fe3O4 to form a Fe3O4 / TiO2 nano composite in a core-shell structure. The particle size of the composition is about 50nm, and the TiO2 on the surface of the composition which has paramagnetism is in an anatase structure. The Fe3O4 / TiO2 nano magnetic composition and the in-situ growing preparation method thereof are simple in process, easy to control in component and performance, feasible in operation and applicable to industrial production, and the prepared Fe3O4 / TiO2 nano magnetic composition reserves certain magnetism and has certain whiteness as well, so that comprehensive performances of the composition are optimized to meet practical application requirements.

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.