148results about How to "Achieving controllable synthesis" patented technology

The invention relates to a divalent metal ion pre-embedded layered vanadium oxide nanometer material as well as a preparation method thereof. The chemical formula of the nanometer material is AxV2O5-y, wherein A is Mg, Ca, Sr or Zn; the MgxV2O5-y has the nanoribbon diameter of 100-1500nm and the length of 5-50 microns or CaxV2O5-y has the nanoribbon diameter of 100-1000nm and the length of 5-50 microns or SrxV2O5-y has the nanoribbon diameter of 100-1000nm and the length of 5-50 microns or ZnxV2O5-y has the nanoribbon diameter of 100-300nm and the length of 5-50 microns or ZnxV2O5-y has the nanoflower diameter of 3-5 microns. The divalent metal ion pre-embedded layered vanadium oxide nanometer material disclosed by the invention has high specific capacity, excellent cycling stability and excellent rate capability and is a potential high-performance commercial zinc ion battery positive electrode material.

The invention discloses a method for preparing manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires. The method comprises the following steps of: preparing a NaMoO4 aqueous solution and a MnCl2aqueous solution; proportioning in a certain ratio of the NaMoO4aqueous solution to the MnCl2 aqueous solution to CTAB (Cetyltrimethyl Ammonium Bromide) to n-butyl alcohol to isooctane and preparing manganese molybdate nanorods by using a microemulsion method; adding the manganese molybdate nanorods into distilled water, stirring and ultrasonically cleaning to obtain transparent liquid; and adding the liquid into a flask, placing the flask in an oil bath of between 60 and 80 DEG C, condensing and refluxing, adding a CoCl2 solution and a Na2MoO4 solution with different concentrations in turn every certain time, stirring to react so as to obtain a product, separating and drying the product to obtain the manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires, wherein the lengths of the nanowires reach 10 microns and the diameters of the nanowires are between 500 and 1,000nm; the manganese molybdate nanorods in the hierarchical heterostructure nanowires are used as a main material and the diameters of the manganese molybdate nanorods are between 300 and 500; and the cobalt molybdate is branch nanorods which orderly grow on the surfaces of the manganese molybdate nanorods and the diameters of the cobalt molybdate nanorods are between 30 and 50nm. The material has excellent electrochemical performance and can be used as an active material for electrodes of electrochemical super capacitors. The method has the advantages of low-cost raw materials, simple process and environmental friendliness.

The invention provides a preparation method of a carbon-coated transition metal nano hollow particle. The method comprises the following steps: based on a Kirkendall effect, carrying out dissolving and mixing, high temperature co-pyrolysis and insulation in-situ reduction on an aromatic hydrocarbon compound with oxygen-containing groups and a transition metal compound so as to obtain the carbon coated metal nano hollow particle. The hollow structure shell layer prepared by the method consists of carbon and a nano metal composite material; and the nano particles are evenly distributed, the diameter range of the nano particle is 20nm-80nm, and the thickness of the carbon-coated layer is 2.2nm-4.3nm.

The invention provides a micron nickel phosphide electro-catalytic material used for hydrogen evolution / oxygen evolution double functions and belongs to the technical field of novel materials. A nickel compound is used as a precursor and a high-boiling-point organic matter is used as a solvent; the material has the characteristics of controlling the synthesis of micron nickel phosphide materials on a microcosmic level and the like; preparation conditions are rapid and moderate; a generated compound of Ni2P and Ni5P4 is of micron-grade nickel phosphide particles and the grain diameter is 5-10 microns; the prepared material can be used for electro-catalytic hydrogen evolution and oxygen evolution double functions and has a good electro-catalytic property; and the material has important meanings on industrial production of the micron-scale nickel phosphide material and application and development of the material, and has a relatively wide application range.

The invention discloses graphene with a folded structure. The structure of the graphene is formed by shrinking the graphene in a liquid phase environment to form ups and downs on the surface, wherein the folded parts are cone-shaped, and the height, width and distribution density of the folded parts are uniform and controllable. The folded parts can be formed in the processes of preparing the graphene and transferring the graphene to a target substrate, and are formed randomly and uncontrollably, but the folded structure formed controllably in a liquid phase, disclosed by the invention, can solve the problems. The invention realizes a novel graphene folded structure and provides a method for preparing the structure simply, conveniently and quickly on a large scale, and the graphene folded structure can be used in the fields of new energy resources, sensors, flexible electronic devices and the like.

The invention relates to a preparation method of a self-supporting molecularly imprinted polymer film. The preparation method comprises the following steps of: firstly, reacting divalent metal ions with a porous alumina film to obtain a porous alumina-based layered double hydroxide; secondly, carrying out further reaction to obtain an SBC (Sulpho-Benzoyl Cyanoacetic Acid) intercalated porous alumina-based layered double hydroxide; and finally, mixing the SBC intercalated porous alumina-based layered double hydroxide with a polymerizable monomer, a polymerized cross-linking agent, a molecularly imprinted template agent and an organic solvent, dispersing by using ultrasound wave, adding a free base polymerization initiator for polymerizing, washing a product obtained by reacting and then drying to obtain the self-supporting molecularly imprinted polymer film. According to the self-supporting molecularly imprinted polymer film disclosed by the invention, the advantages of high strength, corrosion resistance, high temperature resistance and great specific area of an inorganic material as well as high load information quantity and adjustable performance of an organic polymer material can be fully exerted; the active free base polymerization is assisted in controlling; and the controllable synthesis of an ultrathin nano self-supporting structure of a molecularly imprinted material can be realized by using the controllability of the growth process of an active chain.

The invention belongs to the field of preparation of nanomaterials and discloses three-dimensional mesoporous carbon-loaded molybdenum carbide and a preparation method and application thereof. The preparation method comprises the following steps of dissolving a soluble molybdenum salt in water, adding an organic carbon source and a template agent, adjusting the pH value of the solution to be 0-7.0, stirring and evaporating the solution to obtain gel, further dehydrating the gel to obtain xerogel, and calcining the xerogel at the high temperature in the atmosphere of inert gas or reducing gas;carbonizing the organic carbon source to obtain carbon, reducing and carbonizing molybdenum through reducing substances generated in the carbonization process of the organic carbon source to obtain nano molybdenum carbide, soaking nano molybdenum carbide in dilute acid to remove impurities, and then obtaining a target product. Compared with a bulk molybdenum carbide material, the three-dimensionalmesoporous carbon-loaded molybdenum carbide has the advantages that a conductive three-dimensional carbon network structure is obtained, the specific surface area is greater, more reactive sites aregenerated, a carbon-loaded structure prevents molybdenum carbide from agglomerating during high-temperature calcination, and therefore three-dimensional mesoporous carbon-loaded molybdenum carbide hasexcellent electrocatalytic performance.

The invention relates to a surface modification method for improving electrochemical performance of a lithium-rich material based on driving by a metal organic framework material. The obtained material can be taken as a lithium ion battery cathode material, and has great popularization universality. The method comprises the following steps: 1) a proper amount of the lithium-rich material and a proper amount of organic ligand are mixed; 2) an above mixture is placed under vacuum condition for a heating reaction; and 3) the product obtained in the step 2) is subjected to heat treatment under inert atmosphere to obtain the modified lithium-rich material. The method has the beneficial effects that an metal organic framework material-driven carbon-coated surface modification method is used for optimizing the lithium-rich material, and the lithium-rich material has excellent cycle performance and multiplying power performance as the lithium ion battery cathode material.

The invention belongs to the technical field of nano material preparation and discloses nitrogen-doped and carbon-coated molybdenum carbide as well as a preparation method and an application thereof.Diammonium hydrogen citrate is used as a complexing agent and a carbon source, soluble molybdenum salt is used as a molybdenum source, hydrazine hydrochloride is used as a coordination aid, molybdenum / diammonium hydrogen citrate gel is firstly prepared with a sol-gel method, and then, nitrogen-doped and carbon-coated nano molybdenum carbide is obtained through high-temperature carbonization and reduction in an argon atmosphere. Atomic-scale mixing of molybdenum elements and carbon elements can be realized with the sol-gel method, so that agglomeration and growth of molybdenum carbide nanoparticles during high-temperature reduction reactions can be inhibited, and a nitrogen-doped and carbon-coated nano molybdenum carbide electrocatalytic material with uniform structure and distribution is obtained and has excellent performance of electrocatalytic decomposition of water for hydrogen production.

The invention provides a composite nano material. The composite material is prepared from the following components in percentage: 15wt%-35wt% of carbon nitride and 65wt%-85wt% of a carbon nano material; the composite nano material is fiber-shaped; the diameter of fibers is 5nm-20nm and length of the fibers is 500nm-1000nm; and the specific surface area of the material is 900m<2> / g-1000m<2> / g, the pore capacity is 0.3cm<3> / g-0.4cm<3> / g and the conductivity is 5S / cm-8S / cm. The controllable synthesis of the composite material is realized; a two-step hydrothermal method is used for synthesizing for the first time; the process has the advantages of simplicity, low cost, short period, environmental friendliness and the like and can be suitable for industrial large-scale production; when the composite material is applied to an electrode material, the output power is higher and the operation stability is better when compared with those of a microbiological fuel cell assembled by taking conventional Pt / C as a cathode catalyst; and the composite nano material is easy to prepare and low in price and lays a good foundation for commercialization of the microbiological fuel cells.

The invention relates to a preparation method of a titanium oxide nanoflower film, which comprises the steps of uniformly mixing tetrabutyl titanate, concentrated hydrochloric acid and deionized water at a volume ratio of (1-3):15:15 in a reaction kettle provided with a teflon lining, obtaining a clear reaction solution, placing washed FTO (Fluorine doped Tin Oxide) conductive glass in the solution obliquely, sealing the reaction kettle, and allowing the reaction kettle to react at 120-180 DEG C for 1-24h, washing a product after the reaction, drying, and obtaining the titanium oxide nanoflower film. The titanium oxide nanoflower film has hydrophilicity, the average thickness of the film is 10-300 micrometers, and the film is formed by petals with lengths of 1.3-3.2 micrometers and widths of 380-710nm. According to the method, an organic solvent, heavy metal ions or hypertoxic hydrofluoric acid is not used, and the method has the characteristics of low cost, and high safety and controllability. The fabricated titanium oxide nanoflower film is high in photocatalytic activity, and is expected to have wide application prospects in the fields of photocatalytic sterilizing materials, environmental pollution controlling, dye sensitization solar cells and the like.

The invention relates to a potassium ion embedded type vanadium pentoxide nanowire and a preparation method thereof. The preparation method includes 1), weighing V205 to add into deionized water, adding a KOH (potassium hydroxide) water solution and stirring to obtain a water solution; 2), transferring the water solution into a reaction still, heating the water solution, and obtaining deep green products after the water solution is taken out; 3), performing centrifugal separation, washing the deep green products by a mixed solution mixing with absolute ethyl alcohol and deionized water, and then placing the deep green products in a dryer to dry; 4), putting the deep green products in a muffle furnace to have a heat treatment to obtain yellow green samples; and 5), washing the yellow green samples in step 4 with the mixed solution mixing with the absolute ethyl alcohol and the deionized water, putting the yellow green samples in the dryer to dry to obtain the potassium ion embedded type vanadium pentoxide nanowire. The potassium ion embedded type vanadium pentoxide nanowire has the advantages that the nanowire has high specific capacity, good cycling stability and excellent rate capability, and is a potential high-performance commercial lithium ion battery anode material.

The invention discloses a two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores, and a preparation method and applications thereof, and belongs to the technicalfield of nanometer functional material preparation, solar energy utilization, and environment protection. The two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores is prepared through oriented thermal polymerization combined two-step thermal processing technology; more specifically, a liquid phase template agent is adopted to control the thickness of a nanosheet g-C3N4 material, two-step thermal processing technology parameter design is adopted for forming of nanopores on nanosheets; the forming of the nanopores is capable of introducing more active sites, so that the nanosheet g-C3N4 material obtained at last possesses appropriate light absorption characteristic, and relatively high photo-induced electron and cavity separation efficiency, a defect ofblock-shaped g-C3N4 material that photocatalytic efficiency is low is improved, and the two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores can be directly used for organic matter decomposition, microbial pathogen inactivation, and photocatalytic reduction CO2 to produce organic matters under sunlight.

The invention discloses a preparation method of gold nanorods with different length-diameter ratios. The preparation method comprises the following specific steps that 1, a sodium borohydride reducing agent is added into a mixed solution composed of stearyl trimethyl ammoium bromide and chloroauric acid for reacting, and a gold nanoseed solution is prepared; 2, after a stearyl trimethyl ammoium bromide solution, a chloroauric acid solution and a silver nitrate solution are mixed, a glucose solution is added, the gold nanoseed solution obtained in the step 1 is poured into the mixed solution, and the gold nanorods with different length-diameter ratios are prepared by singly regulating and controlling the adding amount of silver nitrate; 3, centrifugal separation is conducted through a temperature difference centrifugation method, and gold nanorod sol is obtained. According to the preparation method, operation is easy, and the regulating and controlling range is wide; the obtained gold nanorods with different length-diameter ratios have the advantages of being good in dispersibility and uniform in particle size and can be widely applied to the fields of biosensing, surface-enhanced Raman scattering and the like.

The invention provides a composite nano material for air purification. The composite nano material is prepared from graphene oxide accounting for 15 to 55 weight percent of the composite material, carbon nanoparticle accounting for 30 to 50 weight percent of the composite material, nano TiO2 accounting for 5 to 10 weight percent of the composite material and nano silver particles accounting for 1 to 3 weight percent of the composite material; the carbon nanoparticle, the nano TiO2 and the nano silver particles are supported on the surface of a graphene oxide nanosheet; the thickness of the nanosheet is 4 to 12nm, the particle size of the nano silver particles is 20 to 50nm, the specific surface area of the material is 700 to 900m<2> / g, and the pore volume is 0.3 to 0.5cm<3> / g. According to the composite nano material provided by the invention, by using a nano-size effect generated by a nano interlamellar structure and the sizes of the nanoparticles, an air purifying material has the functions of adsorption, oxidation purification and sterilization; the graphene oxide and the carbon nanoparticles are combined to enrich the porous structure of the material and the properties of surface functional groups; the composite nano material also embodies good adsorptive selectivity to formaldehyde and other organic pollutants such as benzene, methylbenzene and ammonia.

A preparation method of a filament-like W18O49 material includes the following steps: 1) adding WC16 into anhydrous ethanol to prepare a solution A being 0.03-0.08 mol / L in concentration; 2) adding octadecylamine to the solution A to obtain a solution B; 3) uniformly stirring the solution B under a sealed condition to obtain a solution C; and 4) adding the solution C into a high-pressure reaction kettle, performing a reaction in a homogeneous phase reactor at 140-180 DEG C and cooling a reaction product to obtain the filament-like W18O49 material. The preparation method is mild in reaction conditions and is low in required temperature and is simple in steps and high in repeatability. The filament-like W18O49 material has a strong adsorbility to methylene blue and an excellent photo-catalytic performance to methyl orange, and in particular, has certain adsorbility to the methyl orange in a dark reaction process. Before 40 min of a photo-reaction stage, the material reaches 80% in degradation of the methyl orange. It is predicted that the material has a high exploration value in performances.

The invention discloses a preparation method of PtCu alloy nanospheres. The method comprises the following steps: (1) CuCl white powder is dissolved in saturated KCl solution to form colorless complexing liquid; (2) the colorless complexing liquid is filled in de-ionized water to separate out white substances; (3) the white substances are totally added in potassium chloroplatinate solution to obtain ash black solution; and (4) the ash black solution is stood to remove supernate, is added in KCl saturated solution for standing overnight, is cleaned by the de-ionized water for centrifugation, and is finally frozen and dried to prepare the PtCu alloy nanospheres. The method realizes controllable synthesis of PtCu alloy nanometer catalyst materials in a liquid phase under normal temperature and normal pressure, and obtains the PtCu alloy nanospheres with uniform size distribution; and the synthesis method is simple in process, easy to control, low in cost and high in repeatability.

The invention discloses a preparation method of ZnO nanocrystals. The method comprises the following steps of: dissolving the mixture between Zn(NO3)2.6H2O and any one of hexamethylene tetramine and NaOH in mixed liquor of water and organic solvent, and carrying out hydrothermal reaction to obtain the ZnO nanocrystals, wherein the mole fraction ratio of Zn(NO3)2.6H2O to hexamethylene tetramine is 1: 1, and the mole fraction ratio of Zn(NO3)2.6H2O to NaOH is 1: (5-20). The preparation method of the ZnO nanocrystals disclosed by the invention has the advantages of being simple in operation technological process, low in raw material price, low in reaction temperature, easy for large-scale production and the like, and some reference basis can be provided for the preparation of ZnO nano-materials and the indusial production of the ZnO nano-materials by the typical hydrothermal reaction. Meanwhile, according to the preparation method, after the test parameters are controlled, the ZnO nanocrystals with different shapes and sizes can be successfully prepared, the controllable synthesis of the ZnO nanocrystals can be realized, and the action mechanism and the crystal growth law of different influencing factors can be expounded.

The invention discloses nanosheet prepared from transition metal oxide nano particles and a preparation method thereof and belongs to the technical field of transition metal oxide nano materials. The nanosheet disclosed by the invention aims at solving the problems that a preparation method of existing transition metal oxide nanosheet has a narrow application range, complex technologies, larger particles, uneven sizes and no large-scale synthesis. The nanosheet disclosed by the invention utilizes transition metal phthalocyanine as a metal source, graphene oxide as a formwork, hydrazine hydrate as a reducing agent and distilled water as a medium and is finally prepared through roasting. The preparation method comprises the specific steps: 1, adding graphene oxide into the distilled water, supersonically vibrating, then adding the transition metal phthalocyanine and continuously supersonically vibrating; 2, adding the hydrazine hydrate, stirring, centrifuging, separating and drying; 3, roasting in constant temperature and naturally cooling to room temperature. A product disclosed by the invention is of a unique 2D wrinkle nanosheet structure and has even particle distribution, smaller size, excellent catalytic performance and better stability.

A method for preparing a composite anti-wear additive through aliphatic acid grafting belongs to the technical field of nano-materials. The method comprises the following steps: taking magnesium oxide (MgO) and silica (SiO2) according to a certain mass ratio, mixing the magnesium oxide and silica with a sodium hydroxide solution having a predetermined concentration, adding a certain mass proportion of aliphatic acid, stirring the obtained mixed solution at a predetermined rotating rate for a certain time, and carrying out ultrasonic treatment for a certain time; transferring the obtained mixed solution into a reaction kettle, and sealing the reaction kettle; setting the rotating rate of the magnetic stirrer of the reaction kettle, and setting the heating time, the heat insulation temperature and the heat insulation time; carrying out a reaction, and naturally cooling the reaction kettle to room temperature in order to obtain a reacted mixed solution; and drying the reacted mixed solution at a certain temperature to obtain the composite anti-wear additive. The method has the advantages of simplicity, feasibility, strong operability, and realization of the synthesis of composite powder having different shapes and different particle sizes through controlling reaction conditions.

The invention relates to a calcium vanadate mesoporous nanowire material and a preparation method thereof. The material can be used as a sodium-ion battery anode active material. The calcium vanadate mesoporous nanowire is obtained in combination with post heat treatment by using a hydrothermal process, the molecular formula of calcium vanadate is CaV4O9, the diameter of the nanowire is 100-200 nm, the length of the nanowire is 5-10 microns, a large number of mesopores are uniformly formed in the surface of the nanowire, and the pore diameters of the mesopores are 20-50 nm. The calcium vanadate mesoporous nanowire material has the beneficial effects that the calcium vanadate mesoporous nanowire material has relatively high specific capacity, good cycling stability and extremely excellent rate capacity when being used as the sodium-ion battery anode active material, and is a potential high-performance sodium-ion battery anode material; and moreover, the preparation method is simple in technology, and the calcium vanadate mesoporous nanowire can be obtained through the simple hydrothermal process and subsequent heat treatment, so that the method is green and environmentally-friendly and relatively low in energy consumption.

The invention provides a preparation method of a titanium nitride / silicon nitride / carbon nitride / graphene composite nanomaterial. The method comprises the steps of firstly obtaining a titanium nitride / silicon nitride composite nanomaterial and then obtaining the composite material through a hydrothermal method under the action of a template agent lysine. The obtained material is in a uniform fiber form, the diameter of the fiber is dozens of nanometers, the pore volume is 0.36-0.47cm<3> / g and the specific surface area is 220-280m<2> / g; the prepared nanomaterial has excellent properties of extremely high specific surface area, ultrahigh mechanical property, high conductivity and thermal conductivity and the like, is beneficial to electron transfer in an electrode reaction process when used as a lithium-ion electrode material, is small in absolute volume change in charging and discharging processes, and has high electrochemical lithium storage capacity, good stable cycle performance and a relatively small energy loss; the electrochemical properties of a composite nanomaterial electrode are strengthened; and the application prospect is very wide.

The invention provides a carbon nitride and carbon composite nanomaterial and a preparation method and application thereof. The carbon nitride and carbon composite nanomaterial is synthesized with a one-step hydrothermal method, the composite nanomaterial consists of nanometer-sized microcrystal grains, the diameter of the material grain is 50 to 300 nm, the pore diameter is 2.2 to 3.4 nm, the specific surface area is 160 to 380 m<2> / g, and the pore volume is 0.55 to 1.05 cm<3> / g. The composite nanomaterial is combined with excellent surface performance of carbon nanomaterial and good optical and electrical performances of carbon nitride nanomaterial, and the synthesized composite material can be applied to a plurality of aspects such as lithium ion cell electrode materials, microbial fuel cells and photocatalytic degradation of organic pollutants and purified water.

The invention discloses a multilayer porous hollow bowl-shaped carbon material and a preparation method thereof and belongs to the field of inorganic material preparation. The material is an amorphouscarbonic particle with a bowl-shaped hollow structure, has a sunken bowl-shaped appearance, internally has a hollow structure, a spherical wall is of a multilayer structure, and holes, including micropores and mesopores, exist in the bowl wall. The preparation method comprises the steps of respectively dissolving a surfactant and a carbon source in water, and carrying out hydrothermal carbonization to obtain hydrothermal carbon hollow bowl-shaped carbon; dispersing the powder in an alkaline aqueous solution, dripping ethyl orthosilicate, executing stirring for a certain time, collecting a product, then dispersing the product into a carbon source water solution, and carrying out hydrothermal carbonization coating; repeating the steps of silicon oxide coating and carbon coating according tothe demand for the number of layers; finally, calcining the powder, executing pickling, removing the silicon-containing compound, and executing drying to obtain the multi-layer porous hollow bowl-shaped carbon material. The material has high space utilization rate and tap density, the multilayer spherical wall can provide a large number of active sites for chemical reaction, and synthesis controllable in layer number and thickness of the spherical wall can be achieved by adopting the method.

The invention provides a composite nanometer material for lithium ion battery and a preparing method thereof. The preparing method includes the steps that firstly, silicon-containing sol and a vanadium compound solution are obtained; secondly, a carbon material is prepared; finally, a silicon dioxide / vanadium pentoxide / carbon composite material is obtained with the one step hydro-thermal method. The material obtained with the method is granular, the partical size is 40 nm to 120 nm, the pore diameter is 30 nm to 150 nm, the pore volume is 0.5 cm<3> / g to 1.5 cm<3> / g, and the specific area is 120 m<2> / g to 300 m<2> / g. The ternary composite nanometer material serves as a whole, the electronic conduction rate of an electrode material is increased, the charging performance and discharging performance at the large multiplying power of the electrode material are enhanced, the discharging capacity of the electrode material is magnified, the heat stability of the electrode material is improved, reduction of the battery capacity is reduced, the anti-overcharging performance of the battery is improved, and the cycling service life of the electrode material is prolonged; variation of the absolute volume is small in the charging and discharging process, the composite nanometer material has the high electrochemistry lithium storage capacity and small energy losses, and application prospects are quite broad.

The invention provides a graphene composite nano-material and a preparation method thereof. Through dual modification effects of B and N, on one hand, compared with the undoped graphene, the graphene composite nano-material has higher conductivity and larger surface load free charge density, and can effectively restore the structural defect of the graphene oxide simultaneously, so that doped graphene with good light performance and stability is formed; on the other hand, through coupling of titanium dioxide and doped graphene, synergetic and complementary effect is generated, photo-induced electron is transmitted to an energy band of graphene, cavity and electronic composite rate are reduced, a forbidden band of titanium dioxide is narrowed, a light response scope is expended, so that the photocatalysis performance is greatly improved, and the composite material performance is excellent.

The invention discloses a method for synthesizing monodisperse colloid lead sulphide quantum dots with laser; a block-shaped metal lead target serves as a raw material and is arranged in dodecyl mercaptan, and millisecond pulse laser is used for ablating the lead target; a product which is ablated by the laser is purified, dried, weighed and re-scattered in the dodecyl mercaptan, and initial galena nanocrystalline suspension with the concentration being 4.3mM is prepared; 90 percent of the dodecyl mercaptan is added into the initial galena nanocrystalline suspension with the volume percentage being 10 percent, and initial galena nanocrystalline suspension with the concentration being 0.43mM is obtained and heated in water bath; and millisecond pulse laser which is not focused is used for radiating the suspension for 20 minutes, and the high-purity monodisperse colloid lead sulphide quantum dots with good dispersion and crystallinity are obtained. According to the method for synthesizing monodisperse colloid lead sulphide quantum dots with laser, the process is simple and convenient, the control is easy, no by-products and impurities are produced, raw materials are simple and low-toxin, the reaction temperature is low, and the method is an environment-friendly green synthesis process.

The invention provides a preparation method for a flower-like titanium nitride / carbon nitride / graphene composite nanomaterial. The method comprises the following steps of obtaining titanium nitride firstly, and then obtaining a flower-like composite under the action of a lysine template through a hydrothermal method, wherein the size of the flower-like structure is about 1.5 micron, the flower-like structure is formed by interlacing ultrathin nanosheets with the thickness of 17-23 nm with each other, the specific surface area of the material is 200-260 m<2> / g, so that the composite shows better characteristics when the composite is taken as an electrode material or a photocatalyst. The method has the advantages of simple technique, low cost, short period, friendly environment and the like and can be applicable to industrial mass production.

The invention discloses a preparation method of a CsPbBr3 perovskite three-dimensional cube microcavity sample. The preparation method comprises weighing CsBr and PbBr2 powders, putting the CsBr and PbBr2 powders in a flat quartz boat, putting the flat quartz boat into a quartz tube of a tube furnace, putting a sedimentary sheet in the quartz tube of the tube furnace and in an air outlet of the quartz tube; raising the temperature of the furnace under the protection of nitrogen to 600 DEG C, and reacting, wherein a yellow sediment on the sedimentary sheet is the CsPbBr3 perovskite three-dimensional cube microcavity sample. The surface of a prepared CsPbBr3 three-dimensional cube perovskite microcavity is smooth, the size of the three-dimensional cube microcavity is 1-15 mum, the size and the height are adjustable, and the preparation method has the excellent characteristics of convenient operation, high repeatability, high crystalline quality, controllable morphological size and height, etc.

The invention discloses a method for carrying out controlled synthesis of nano-gold collosol by utilizing thioalcohol. The method comprises the following steps: firstly, filling thioalcohol on the surface of gold seeds coated with protective agent; then changing concentration of thioalcohol in a heating process of growing seeds by utilizing reducing agent to realize different growth degrees. All in all, the using amount of thioalcohol in the synthesis process of the seeds is extremely small, thioalcohol is needed to develop a main action in the growth process of the seeds, and therefore, the using amount is dramatically increased. According to the method, the size of nano-gold particles can be accurately controlled, and relatively good monodispersity can be obtained; by means of scanning electron microscopy, the size and the shape of the nano-gold can be obtained, and finally, association between the concentration of thioalcohol and the particle size of the nano-gold is built; and therefore, important guiding significance on selection of surface controlling agent of nano-particles and controlled preparation of nano-particles in the nanotechnology can be achieved.