752 results about "Nanoflower" patented technology

The invention discloses a hydrothermal synthesis method of molybdenum disulfide nano flowers. The hydrothermal synthesis method mainly comprises the following steps: adding an inorganic molybdenum source, an organic sulfur source and a proper amount of reducing agent into deionized water, uniformly mixing the ingredients, transferring the mixture into a high pressure reaction kettle, and then heating the mixture at a high temperature for 24 hours; washing and centrifugally separating the obtained solution for multiple times, and finally drying the solution to obtain black solid powder, namely, the molybdenum disulfide nano flowers. The hydrothermal synthesis method disclosed by the invention has the beneficial effects that the whole reaction and drying process is carried out in a sealed environment to avoid direct air exposure so as to ensure the product purity; since the reducing agent adopted by the hydrothermal synthesis method disclosed by the invention can be both used as the sulfur source and as a catalyst, no impurity is generated, and thus, the product purity is further improved.

Embodiments of the invention include methods and devices for producing light by injecting electrons from field emission cathode across a gap into nanostructured semiconductor materials, electrons issue from a separate field emitter cathode and are accelerated by a voltage across a gap towards the surface of the nanostructured material that forms part of the anode. At the nanostructure material, the electrons undergo electron-hole (e-h) recombination resulting in electroluminescent (EL) emission. In a preferred embodiment lighting device, a vacuum enclosure houses a field emitter cathode. The vacuum enclosure also houses an anode that is separated by a gap from said cathode and disposed to receive electrons emitted from the cathode. The anode includes semiconductor light emitting nano structures that accept injection of electrons from the cathode and generate photons in response to the injection of electrons. External electrode contacts permit application of a voltage differential across the anode and cathode to stimulate electron emissions from the cathode and resultant photon emissions from the semiconductor light emitting nanostructures of the anode. Embodiments of the invention also include the usage of nanostructured semiconductor materials as phosphors for conventional planar LED and nanowire array light emitting diodes and CFL. For the use in conventional planar LEDs, the nanostructures may take the form of quantum dots, nanotubes, branched tree-like nanostructure, nanoflower, tetrapods, tripods, axial heterostructures nanowires hetero structures.

The invention relates to a carbon dioxide electrochemical reduction catalyst as well as a preparation method and an application thereof. The carbon dioxide electrochemical reduction catalyst comprises tin dioxide nanoflower, wherein the tin dioxide nanoflower is synthesized through hydrothermal reaction and comprises the synthesis raw materials including 0.1-0.5M of tin dioxide, 1-5M of trisodium citrate mixed solution and 0.1-0.5M of sodium hydroxide. The carbon dioxide electrochemical reduction catalyst is applied to a carbon dioxide electrochemical reduction catalyst gas diffusion electrode. The carbon dioxide electrochemical reduction catalyst has the advantages that the specific surface area of the catalyst is enlarged, the electrochemical reduction catalytic activity of the catalyst for carbon dioxide reduction is improved, the hydrogen evolution reaction is effectively inhibited, and the selectivity of formic acid in a product is improved.

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 relates to a gold nanoflower preparing method and the application of gold nanoflowers. The preparing method comprises the following steps that 1) under room temperature, polyphenol is added to water solution with the pH value of 7-12 to obtain mixed solution; 2) chloroauric acid and hydrogen peroxide are then added in sequence, shaking up is carried out to obtain reaction solution; 3) the reaction solution is centrifuged, supernatant is abandoned, and the gold nanoflowers are obtained after washing. The particle diameters of the gold nanoflowers obtained under different pH values are 50-200nm, stability is good, the gold nanoflowers can be used in a biological body as a medicine carrier and have good biocompatibility, the gold nanoflowers can be used in chemiluminescence analysis, the signal intensity of a luminal chemiluminescence system can be obviously enhanced, the gold nanoflowers can be used in surface-enhanced Raman scattering (SERS) analysis, and the sensitivity is better than that of spherical gold nanoparticles. The gold nanoflower preparing method has the advantages that raw materials are easy to get, reaction conditions are mild, efficiency is high, speed is high, and batch preparing and producing are benefited.

The invention relates to construction of an algal toxin Raman sensor adopting a gold nanoflower-silver nanoparticle bimetallic nano assembly and belongs to the field of material chemical application. The construction mainly comprises the contents that a simple and convenient synthetic method of gold nanoflowers with controllable surface bulges is provided; by controlling concentration of hydroxylamine hydrochloride, gold nanoflower structures with different bulge sizes can be obtained; based on a Y-shaped aptamer assembling configuration, the old nanoflower-silver nanoparticle bimetallic nano assembly is prepared; a spacing size and intensity variation of an electromagnetic field of the nano assembly under the condition of multiple hot spots between double metals are researched; Raman signal amplifying intensity of the assembly is analyzed; and the Raman sensor with a high speed, high specificity and high sensitivity for algal toxin is constructed.

The present invention provides are a gold nanoflower structure and a preparation method therefor. The gold nanoflower structure is a gold nanoflower particle, with round-head columns being uniformly distributed at the periphery thereof, obtained by using gold octahedrons, gold balls or gold tetrahedrons as seed crystals and reducing chloroauric acid by using weak reductant in an environment of high-concentration polyvinylpyrrolidone. In addition, also provided in the present invention are a gold nanoflower/quantum dot composite probe for living cell immunofluorescent labeling and photothermal therapy, a preparation method therefor and a use thereof. In comparison with traditional probes, the probe, incorporates the features of photothermal therapy and fluorescent labeling, and is capable of killing cancer cells in an effective and directional way. Two light sources are adopted to bring a tremendous photothermal conversion efficiency and a greater enhancement on fluorescence intensity of quantum dots respectively, thus mutual interference of two effects are avoided tactfully. The coating of silicon dioxide averts the biotoxicity of the gold nanoflower and the quantum dot effectually, enabling the surface of the composite probe to be easily functionalized and also imparting an extraordinarily excellent biocompatibility to the composite probe.

The invention discloses a surface enhanced Raman scattering detection chip and a preparation method thereof. In-situ growth of nanometer flower-like ZnO on a silicon wafer is achieved by utilization of a hydrothermal method. A three-dimensional ZnO-Ag composite material is prepared by utilization of a physical non-solvent magnetron sputtering method. The composite material has high surface enhanced Raman effects. In addition, the composite material is modified with probes so as to construct a chip with the surface enhanced Raman effects. By modification with sulfydryl type probe molecules, explosive molecules with low original Raman activity can be captured on the chip. Through synergetic resonance, the probes and the composite material generate surface enhanced Raman signals, so that the sensitivity of the chip to the explosive molecules is better than that of a simple substrate not modified by probes. In addition, the chip shows good Raman effects for a plurality of explosives and has single high selectivity for the explosive TNT.

The invention relates to a method for controlling morphology of graphene coated nano-titanium dioxide, a product prepared by the method and an application of the method, and belongs to the new technical field of a carbon quantum dot application and the technical field of a chemical power supply. The graphene coated nano-titanium dioxide of different morphological structures is obtained through control according to different carbon quantum dot concentrations, carbon quantum dots are taken as a morphological additive for inducing titanium dioxide nanocrystalline to grow into a one-dimensional nanoneedle structure, and further the titanium dioxide nanocrystalline is self-assembled into three-dimensional nano-flower-shaped structure. According to the graphene coated titanium dioxide of the nano-flower-shaped structure obtained by the method, the specific capacity of the titanium dioxide is increased, moreover, the conductivity of the graphene coated nano-titanium dioxide is greatly improved, high energy density and good cycling stability are presented in a sodium storage aspect, the graphene coated nano-titanium dioxide is characterized in simple preparation technology and low raw material cost and is applicable to commercial production.

The invention provides an acetone sensor based on a NiO/ZnO heterostructure nanoflower sensitive material and a preparation method of the acetone sensor, and belongs to the technical field of semiconductor oxide gas sensors. The NiO/ZnO heterostructure nanoflower sensitive material which is used is a NiO-ZnO heterostructure nanoflower sensitive material prepared through a water-bath method and a dipping method. The sensitivity of the sensor to acetone is effectively improved through the catalysis effect of NiO nanoparticles on organic gas and the heterostructure of NiO and ZnO. In addition, The sensor is structurally composed of an Al2O3 insulating ceramic pipe which is sold on the market and comprising two annular cold electrodes, a semiconductor sensitive material with which the annular gold electrodes and the Al2O3 insulating ceramic pipe are coated, and a nichrome alloy heating coil penetrating through the Al2O3 insulating ceramic pipe. The device is simple in process, small in size and suitable for mass production, and therefore the acetone sensor has wide application prospects on the aspect of the acetone content in detection microenvironments.

The invention discloses a surface enhanced Raman scattering immunochromatography test paper strip and a preparation method and application. The test paper strip comprises a bottom liner, a sample absorbing cushion, a combination cushion, a chromatography membrane and a water absorbing cushion. The sample absorbing cushion, the combination cushion, the chromatography membrane and the water absorbing cushion are closely connected in sequence and are attached to the bottom liner, wherein gold-kernel and silver-shell nanoflower marked antibodies I adhere to the combination cushion, a detection line is arranged on the chromatography membrane, and antibodies II or antigens A adhere to the detection line. According to the surface enhanced Raman scattering immunochromatography test paper strip and the preparation method and application, due to the fact that the gold-kernel and silver-shell nanoflower marked antibody I are dispersed on the combination cushion, the antigens A or the antibodies II linearly adhere to the chromatography membrane, and the detection line is formed; the sample absorbing cushion, the combination cushion, the chromatography membrane and the water absorbing cushion are sequentially connected to the bottom liner in a lap joint mode; the surface enhanced Raman scattering immunochromatography test paper strip is obtained. The surface enhanced Raman scattering immunochromatography test paper strip has the advantages of being safe to operate, easy and convenient to use, low in cost, fast to use, high in sensitivity and the like and is wide in application range.

The invention discloses a nano flower-shaped NiCoP supercapacitor electrode material, a preparation method and an application thereof. The preparation method comprises the steps: taking metal organicframeworks (MOFs) as a precursor; and obtaining a metal phosphide electrode active material derived from the MOFs through low-temperature phosphorization. The nano flower-shaped Ni-Co bimetallic phosphide (NiCoP) prepared by the method is used as an electrode material of a supercapacitor, and has a high specific capacitance (1174F g<-1> at 1A g<-1>) and excellent cycling stability (a specific capacitance is only attenuated by 22.7% after cycling for 5000 circles); an asymmetric supercapacitor assembled by taking the prepared nano flower-shaped NiCoP electrode material and reduced graphene oxide (RGO) as a positive electrode active material and a negative electrode active material has energy density of 38.01 Wh kg<-1> under power density of 800W kg <-1>; and meanwhile, the device has a longcycle life.

Disclosed are a flower-like nanometer cobalt hydroxide material and a preparation method thereof. The material is synthesized by the self-assembling method. The preparation method includes that metallic cobalt is reacted with alkali in an oil and water double-phase system at the room temperature, and the flower-like nanometer cobalt hydroxide material is prepared under a guiding effect and a wrapping effect of a soft template with the participation of the soft template. The preparation method is simple to operate and easy to control. The size of a multi-dimensional structure a prepared cobalt hydroxide nanoflower ranges from 300 nanometers to 500 nanometers approximately, the multi-dimensional structure of the nanoflower is self-assembled by cobalt hydroxide plates, and the nanoflower is high in specific surface area and pore volume, and can be applied to fields of battery materials, catalytic materials and the like.

The invention relates to a preparation method of three-dimensional multistage SnO2 nanoflowers, which is characterized in that the initial raw materials for preparing the SnO2 nanoflowers are SnCl2.2H2O, NaOH, CTAB (cetyltrimethylammonium bromide) and deionized water. The preparation process comprises the steps of hydrothermal treatment, centrifuging, washing, drying and roasting. The structural feature of the prepared SnO2 nanoflowers is a three-dimensional multistage flower-like structure assembled from three-dimensional SnO2 nanosheets. The diameters of the prepared SnO2 nanoflowers are 1-3 mu m, and the nanosheets are 20-40nm thick. The invention discloses a specific preparation method of the three-dimensional multistage SnO2 nanoflowers. The raw materials for preparing the SnO2 nanoflowers are cheap and accessible; the method for preparing the SnO2 nanoflowers is environment-friendly, and has the advantages of low hydrothermal temperature and low energy consumption; the method for preparing the SnO2 nanoflowers is simple to operate, also has the advantages of high repeatability and high yield, and is mass production; and the three-dimensional multistage SnO2 nanoflowers have special and peculiar shape, can be used as a material for sensors, catalysts, catalyst supports and the like, and has favorable application prospects.

The invention relates to a nitrated carbon fiber loaded bismuth oxyhalide nanoflower and a preparation method of the nanoflower. The preparation method of the nanoflower comprises the following steps: respectively dissolving a halogenous ionic solution and bismuth nitrate in ethylene glycol monomethyl ether, slowly adding the halogenous ionic solution into a bismuth nitrate solution after the halogenous ionic solution and the bismuth nitrate are fully dissolved in the ethylene glycol monomethyl ether, evenly stirring and mixing the mixed solution, pouring the mixed solution to a high-pressure reaction kettle with a polytetrafluoroethylene liner, then placing nitrated carbon fiber in the kettle, reacting for 0.5-6 hours in a drying oven at the temperature of 150-160 DEG C, naturally cooling and then washing and drying to obtain a product. Through the nitrated carbon fiber loaded bismuth oxyhalide nanoflower, the BiOX is reused and the problem of secondary pollution is solved; ACF (Active Carbon Fiber) is excellent in adsorption property and capable of absorbing organic pollutants and facilitating the photo-catalysis.

The invention discloses a hydrogel type enzyme catalytic material which contains protease-inorganic hybrid nanoflower and is prepared through secondary immobilization synthesis, and a preparation method and applications thereof. According to the preparation method, protease is taken as an organic component, and is subjected to self-assembling with inorganic metal ions so as to obtain the protease-inorganic hybrid nanoflower; the protease-inorganic hybrid nanoflower is embedded with a gel carrier system which is excellent in biocompatibility and contains at least two hydrophilic polymers, repeat freezing-unfreezing method is adopted to obtain the hydrogel containing protease-inorganic hybrid nanoflower. The unique tridimensional network of the hydrogel containing protease-inorganic hybrid nanoflower is capable of realizing stable existing of enzymes in a catalytic system, and secondary immobilization is achieved. According to the preparation method, secondary immobilization is adopted,so that protease is protected from external environment influences, enzyme stability is improved, enzyme reusability is improved. Separation of the catalytic material with reactants is not necessary,so that a step of separation of enzymes with substrates is avoided, and the application prospect in the field of enzyme immobilization is promising.

The invention belongs to the technical field of metal solid catalysts, and discloses a lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as a preparation method thereofand an application of the catalyst in lignin depolymerization. The preparation method comprises the following steps: lignin is used as a carbon source, magnesium oxide is used as a template agent, and a mixed solution system containing the lignin and the magnesium oxide is treated by utilizing microwaves to obtain a lignin and magnesium oxide precursor complex; and high-temperature calcination isperformed to obtain a lignin-based nanoflower porous carbon carrier, and an active component Ru is supported by using an impregnation method to prepare the lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst. The obtained catalyst provided by the invention has a structure which is composed of a large number of irregular pleated nanoflowers and has developed pore channels andthe characteristics of smaller supported ruthenium nanoparticles (1.5-6 nm), a large specific surface area (5-180 m<2>/g), high dispersity and high stability, can be applied to the lignin depolymerization and exhibit excellent activity, and has a monophenol yield of 26.8% and good cycle stability.

The invention relates to a preparation method of gold nanoflowers for targeting therapy of tumors. According to the method, by controlling various reaction conditions to prepare the gold nanoflowers differing in dimension, modifying a hydrophilic polymer in situ on the surface through a mercapto group, selectively linking different tumor-targeting molecules on the hydrophilic polymer through a reaction between the mercapto group and succinimide and linking antineoplastic drugs of different numbers onto the surfaces of the gold nanoflowers by stimulating a responsive acylhydrazone bond, the gold nanoflowers which have the property of tumor targeting and combine photo-thermal therapy and chemotherapy are prepared. The gold nanoflowers have the characteristics of near-infrared responsiveness, good stability, good biocompatibility and the like. An obtained finished product can meet demands of clinical application.

The invention relates to a composite titanium dioxide nanoflower photoelectrocatalysis material and preparation and application thereof.Preparation includes the following steps that 1, tetrabutyl titanate is added into a hydrochloric acid solution and mixed uniformly, then the mixed solution is moved into a high-pressure reactor, cleaned FTO conducting glass is soaked in reaction fluid in the high-pressure reactor with the conducting face facing upwards, and an FTO electrode with supported nanoflower-shaped titanium dioxide is obtained through heat treatment; 2, precious metal nanometer points are deposited on FTO through a continuous ion layer adsorption method to obtain a titanium dioxide nanoflower electrode with supported precious metal nanometer points; 3, the titanium dioxide nanoflower electrode with the supported precious metal nanometer points is soaked in an ammonia solution where cadmium sulfate and thiourea are dissolved, water-bath heating is conducted for 10-15 min with the supporting face facing upwards, and the product is taken out and calcined to obtain the titanium dioxide nanoflower photoelectrocatalysis material coated with a precious metal nanometer point cadmium sulfide film.The preparing method is simple, and the prepared catalysis material is good in performance and has higher hydrogen generation capacity when applied to hydrogen generation.

The invention belongs to a metal-organic framework material, and discloses a composite nanometer metal-organic framework material which has a spherical three-dimensional nanoflower structure and whichis formed by self-assembling of metal ions and an organic component, and application of the material in super-capacitor performance. A one-step synthesis technique is adopted, and self-assembling ofa terephthalic acid organic ligand, cobalt chloride and nickel chloride in a mixture solution consisting of N,N-dimethyl formamide, ethanol and water is utilized to obtain the metal-organic frameworkspherical nanoflower structure with uniform distribution dimension and size and with a diameter of 7-12 [mu]m. Similar nanometer materials can be synthesized by the method. In addition, the metal-organic framework material has a high number of active sites and has good electrical conductivity, so that the metal-organic framework material has good super-capacitor performance.

The invention relates to a preparation method of a Prussian blue flower-like nano-structure electrode material. The preparation method comprises the following steps: 1) firstly, dissolving nickel chloride hexahydrate and anhydrous sodium citrate into de-ionized water; 2) dissolving sodium ferrocyanide decahydrate into de-ionized water; 3) pouring a solution of step 2) into a mixed solution obtained by step 1) and uniformly stirring to obtain a mixed solution; 4) standing the mixed solution obtained by step 3); 5) centrifuging and collecting sediment; washing the sediment for several times; drying in vacuum to obtain Prussian blue precursor powder; 6) adding the precursor powder into a sodium hydroxide solution and carrying out ultrasonic treatment; 7) centrifuging and collecting a product and washing; drying in vacuum to obtain light green powder, namely the Prussian blue flower-like nano-structure electrode material. The preparation method provided by the invention has the beneficial effects that the specific surface area is remarkably enlarged so that reaction sites of electrolyte and the electrode material are effectively increased and an ion diffusion distance is reduced; when the Prussian blue flower-like nano-structure electrode material is used as a positive electrode active material of a sodium ion battery, the material has the characteristics of high power and good cycling stability.

The disclosed preparation method for TiO2 with three-dimension nano-flower structure comprises: preparing the acid pickling solution with HF, HNO3 and deionized water to clean the metal titanium plate surface; adding HNO3 and hexamethylenetetramine in H2O2 solution to obtain the reaction liquor to dip the plate and react for more than 48h at 60~80Deg; clearing the reacted titanium plate with deionized water, drying and holding for at least 10min at 300~500Deg. This product has well directed shape and crystallization, small size, and high specific surface area and purity. This invention is simple and practical and economical.

The invention discloses a Ni-Fe composite hydroxide oxygen evolution anode material used for a sodium carbonate system and a preparation method of the Ni-Fe composite hydroxide oxygen evolution anode material. The oxygen evolution anode material is of a three-dimensional nanoflower-like structure assembled by ultrathin nanosheets. Because of the special three-dimensional structure, not only are oxygen evolution catalytic activity sites of an electrode surface increased, but also escape of precipitated oxygen is facilitated. The oxygen evolution anode material is applied to sodium carbonate electrolysis, oxygen evolution potentials are reduced, energy consumption is greatly reduced, and economic value and practical value are great. Meanwhile, a method of cathodic reductionelectro-deposition is adopted in a sulfate or chlorate system, hydrogen generated from cathodic reduction serves as a template to facilitate oriented growth of deposited composite hydroxides, and the three-dimensional nanoflower-like structure is obtained. The preparation method is simple, feasible, mild in condition and suitable for industrialized application.

The invention belongs to the field of energy material preparation and application, and discloses a nitrogen-doped carbon-coated nanoflower-shaped MoSe2 composite material and preparation and application. The method comprises the following steps: 1) adding selenium powder into a sodium borohydride solution, mixing, adding a molybdenum source solution, stirring and mixing, further adding an organic carbon source, putting into a high-pressure reaction kettle, performing a heat-preservation reaction, cooling, filtering, washing, drying, and calcining in an inert gas atmosphere, so as to obtain a MoSe2/C product; 2) dispersing the MoSe2/C product into water, adding a nitrogen source, performing ultrasonic treatment, performing heating stirring till being evaporated to dryness so as to obtain a precursor; (3) heating the precursor in the inert gas atmosphere, and calcining at 500-700 DEG C, thereby obtaining the nitrogen-doped carbon-coated nanoflower-shaped MoSe2 composite material. The nitrogen-doped carbon-coated nanoflower-shaped MoSe2 composite material is relatively large in specific surface area, good in hydrogen separation catalysis activity and stability, simple in method, wide in raw material source, low in cost and applicable to large-scale production.