11766 results about "Nanosheet" patented technology

A low temperature chemical route to efficiently produce nanomaterials is described. The nanomaterials are synthesized by intercalating ions into layered compounds, exfoliating to create individual layers and then sonicating to produce nanotubes, nanorods, nanoscrolls and / or nanosheets. It is applicable to various different layered inorganic compounds (for example, bismuth selenides / tellurides, graphite, and other metal complexes, particularly transition metal dichalcogenides compounds including oxygen, sulfur, tellurium or selenium).

Surface films, paints, or primers can be used in preparing aircraft structural composites that may be exposed to lightning strikes. Methods for making and using these films, paints or primers are also disclosed. The surface film can include a thermoset resin or polymer, e.g., an epoxy resin and / or a thermoplastic polymer, which can be cured, bonded, or painted on the composite structure. Low-density electrically conductive materials are disclosed, such as carbon nanofiber, copper powder, metal coated microspheres, metal-coated carbon nanotubes, single wall carbon nanotubes, graphite nanoplatelets and the like, that can be uniformly dispersed throughout or on the film. Low density conductive materials can include metal screens, optionally in combination with carbon nanofibers.

A method of forming two or more nano-sheet devices with varying electrical gate lengths, including, forming at least two cut-stacks including a plurality of sacrificial release layers and at least one alternating nano-sheet channel layer on a substrate, removing a portion of the plurality of sacrificial release layers to form indentations having an indentation depth in the plurality of sacrificial release layers, and removing a portion of the at least one alternating nano-sheet channel layer to form a recess having a recess depth in the at least one alternating nano-sheet channel layers, where the recess depth is greater than the indentation depth.

Methods and devices are provided for high-throughput printing of semiconductor precursor layer from microflake particles. In one embodiment, the method comprises of transforming non-planar or planar precursor materials in an appropriate vehicle under the appropriate conditions to create dispersions of planar particles with stoichiometric ratios of elements equal to that of the feedstock or precursor materials, even after settling. In particular, planar particles disperse more easily, form much denser coatings (or form coatings with more interparticle contact area), and anneal into fused, dense films at a lower temperature and / or time than their counterparts made from spherical nanoparticles. These planar particles may be microflakes that have a high aspect ratio. The resulting dense film formed from microflakes are particularly useful in forming photovoltaic devices. In one embodiment, at least one set of the particles in the ink may be inter-metallic flake particles (microflake or nanoflake) containing at least one group IB-IIIA inter-metallic alloy phase.

A method of manufacturing a MXene nanosheet includes removing an A atomic layer from an inorganic compound having a formula of Mn+1AXn to form a nanosheet, the nanosheet having a formula of Mn+1XnTs, and reducing the nanosheet having a formula of Mn+1XnTsto form an MXene nanosheet, the MXene nanosheet having a formula of Mn+1Xn, wherein M is at least one of Group 3 transition metal, Group 4 transition metal, Group 5 transition metal, and Group 6 transition metal, A is at least one of a Group 12 element, Group 13 element, Group 14 element, Group 15 element and Group 16 element, X is one of carbon (C), nitrogen (N) and a combination thereof, Ts is one of oxide (O), epoxide, hydroxide (OH), alkoxide having 1-5 carbon atoms, fluoride (F), chloride (Cl), bromide (Br), iodide (I), and a combination thereof, and n is one of 1, 2 and 3.

Provided in this invention is a process for producing chemically functionalized nano graphene materials, known as nano graphene platelets (NGPs), graphene nano sheets, or graphene nano ribbons. Subsequently, a polymer can be grafted to a functional group of the resulting functionalized NGPs. In one preferred embodiment, the process comprises (A) dispersing a pristine graphite material and an azide or bi-radical compound in a liquid medium comprising to form a suspension; and (B) subjecting the suspension to direct ultrasonication with to ultrasonic waves of a desired intensity or power level for a length of time sufficient to produce nano graphene platelets and to enable a chemical reaction to occur between the nano graphene platelets and the azide or bi-radical compound to produce the functionalized nano graphene material. Concurrent production and functionalization of NGPs directly from pristine graphitic materials can be achieved in one step and in the same reactor.

The invention belongs to the technical field of membrane preparation and water purification and discloses a high-performance two-dimensional layered Ti3C2-MXene membrane, a preparation method thereof and an application of the Ti3C2-MXene membrane in water treatment. The method comprises steps as follows: (1), Ti3AlC2 powder and an HF solution are mixed, stirred for a reaction, centrifugally washed and dried, and Ti3C2 powder is obtained; (2), the Ti3C2 powder and a solvent are mixed, stirred for the reaction, washed and dried, and treated powder is obtained; (3), the treated powder is dissolved in the solvent and subjected to ultrasonic treatment and centrifugation, a liquid supernatant is taken and dried, and a two-dimensional nanosheet is obtained; (4), a solution is prepared from the two-dimensional nanosheet and deposited on a porous substrate with a nano self-assembly technology, and the high-performance two-dimensional layered Ti3C2-MXene membrane is obtained. The membrane has ultrahigh water flux, higher selectivity and good mechanical property and stability; the method is simple, low in energy consumption and cost, good in repeatability and wide in applicability.

An interpenetrating network assembly with a network of connected flakes of nano-scale crystalline carbon and nano-scale particles of an electroactive material interconnected with the carbon flakes is provided. The network assemblies are particularly suited for energy storage applications that use metal oxide electroactive materials and a single charge collector or a source and drain. Interpenetrating networks of graphene flakes and metal oxide nanosheets can form independent pathways between source and drain. Nano-scale conductive materials such as metal nanowires, carbon nanotubes, activated carbon or carbon black can be included as part of the conductive network to improve charge transfer.

The invention relates to a method for preparing a nanocomposite by using two-dimensional transition metal chalcogenide nanosheets and metal, and belongs to the field of nanomaterial synthesis. The method mainly includes adding a reducing agent and a stabilizing agent into monolayer or multi-layer two-dimensional transition metal chalcogenide nanosheet aqueous dispersion obtained after chemical intercalation, then injecting a certain amount of metal salt solution, and preparing the metal nanocomposite based on monolayer or few-layer two-dimensional transition metal chalcogenide nanosheets on the conditions of ice bath, hydrothermal method, microwaves, ultrasound and the like. In the composite, metal nanoparticles can be evenly distributed on the surfaces of the nanosheets, and the obtained composite can be evenly dispersed in water, and can be used in the solution phase and further processed. Through compositing of the metal nanoparticles, photoelectric property of two-dimensional transition metal chalcogenide can be improved, and the nanocomposite has good application prospects in the fields of supercapacitors, fuel cells and biosensors based on surface enhanced Raman detection, and the like.

An IC structure according to the disclosure includes: a substrate; a pair of transistor sites positioned on the substrate, wherein an upper surface of the substrate laterally between the pair of transistor sites defines a separation region; a pair of nanosheet stacks, each positioned on one of the pair of transistor sites; an insulative liner conformally positioned on the upper surface of the substrate within the separation region, and a sidewall surface of each of the pair of transistor sites; a semiconductor mandrel positioned on the insulative liner and over the separation region; a pair of insulator regions each positioned laterally between the semiconductor mandrel and the insulative liner on the sidewall surfaces of each of the pair of transistor sites; and a source / drain epitaxial region positioned over the pair of insulator regions and the semiconductor mandrel, wherein the source / drain epitaxial region laterally abuts the pair of nanosheet stacks.

The invention discloses a graphene nano sheet / MoS2 composite nano material and a synthesis method thereof. The method comprises the following steps of: preparing a graphite oxide nano sheet from graphite by using a chemical oxidation method, then dissolving molybdate into deionized water to form a solution of 0.02 to 0.07M, and adding thioacetamide or thiourea serving as a sulfur source and a reducer, wherein the mass ratio of the thioacetamide or the thiourea to the molybdate is 5:1-12:1; and adding the graphite oxide nano sheet into the solution, performing ultrasonic treatment for 1 to 2 hours so that the graphite oxide nano sheet is fully dispersed in a hydrothermal reaction solution, transferring the mixture into a hydrothermal reaction kettle, sealing, reacting for 20 to 36 hours at the temperature of between 220 and 260 DEG C, and obtaining the graphene nano sheet / molybdenum disulfide composite nano material by one-step hydrothermal synthesis, wherein the mass ratio of the graphene nano sheet to the molybdenum disulfide in the composite material is 1:2-4:1. The method has the characteristics of mild reaction condition and simple process. The synthesized graphene nano sheet / molybdenum disulfide composite nano material serving as an electrochemical lithium storage and electrochemical magnesium storage electrode material has wide application.

The invention discloses a graphene-supported cobaltosic oxide nano composite material and a preparation method thereof. The graphene-supported cobaltosic oxide nano composite material consists of graphene and cobaltosic oxide, wherein the cobaltosic oxide is loaded on graphene nano sheets; the content of the graphene nano sheets is 2 to 95 weight percent, and the thickness of the graphene nano sheets is 0.3 to 50 nanometers; and the particle size of the cobaltosic oxide is 1 to 200 nanometers and the cobaltosic oxide is ball-shaped or flaky. The preparation method comprises: firstly, mixing solution of graphene oxide, a bivalent cobalt salt and a polymer surfactant; and secondly, mixing the solution obtained by the first step with alkaline solution added with an oxidant, stirring the mixed solution or stirring the mixed solution by ultrasonic waves for 0.2 to 5 hours, transferring the mixed solution to a high-temperature reaction kettle, annealing the reaction product at 100 to 250 DEG C for 3 to 30 hours to obtain a product and washing and drying the product to obtain the graphene-supported cobaltosic oxide nano composite material. The size of the cobaltosic oxide is controllable. The reduction of the graphene oxide and the generation of the cobaltosic oxide are accomplished at the same time.

The invention discloses a g-C3N4 nanosheet / CdS composite visible-light-driven photocatalyst and a preparing method and application thereof and belongs to the technical field of material preparation and photocatalysis. The catalyst is directly obtained with the solvothermal method by taking two-dimensional ultra-thin g-C3N4 nanosheets as the matrix, cadmium acetate dihydrate and thioacetamide as raw materials, and ethyl alcohol as the solvent. Compared with general block g-C3N4 / CdS, the two-dimensional ultra-thin g-C3N4 nanosheet / CdS composite photocatalyst prepared with the method has the advantages that the two substances are in tighter contact, the specific surface area is larger, photon-generated electron-hole can be better separated, and photocatalytic efficiency is higher. Under the shining of sunlight, the composite photocatalyst enables catalytic degradation of organic pollutants such as methyl orange in water to be achieved well. The preparing method is easy, raw materials are easy to obtain, visible light catalysis efficiency is high, and the application prospect is wide in the photocatalysis field.

Carbon nanotubes, graphene nanoplatelets, and / or metal oxides are incorporated in a polymer to form a sensing element that may be applied on to a surface for sensing hydrocarbon leakage, mechanical stress, and / or temperature change of a hydrocarbon transportation and / or storage structure. Electrical signals from the sensing element are processed to check for indicators of leakage, stress and / or temperature change.

The invention discloses a molybdenum disulfide (MoS2) nano-sheet film material and its preparation methods. The film material is characterized in that MoS2 nano-sheets vertically and sequentially grow on a conductive substrate, and the diameters and the thicknesses of the MoS2 nano-sheets are 0.05-2mum and 2-30nm respectively. There are two preparation methods of the film material. One preparation method comprises the following steps: a substrate which can be a copper sheet, a silver sheet, a titanium sheet, a tungsten sheet, a molybdenum sheet or carbon is placed in a solution comprising a molybdate and sulfur-containing compounds (comprising thiourea, thioacetamide and L-cysteine); and the sulfur-containing compounds undergo a hydrothermal reaction to grow the compactly-grown and uniformly-sequential MoS2 nano-sheet films on the substrate. Another method comprises the following steps: the molybdenum sheet is directly placed in a solution of the sulfur-containing compounds (comprising thiourea, thioacetamide and L-cysteine); and the sulfur-containing compounds undergo a sulfuration reaction under a hydrothermal condition to form the compact and uniform MoS2 nano-sheet ordered films. The film has a low hydrogen evolution overpotential (-30mv), a small Tafel slope (52mV / dec) and a high electrochemical stability, and is a hydrogen evolution electrode material extremely having an application prospect.

The invention relates to a two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite as well as preparation and application thereof. The composite is formed by two-dimensional transition metal carbide (nitride) MXene nanosheets and nano sulfur particles, wherein the nano sulfur particles grow on the surface of the two-dimensional transition metal carbide (nitride) MXene nanosheets in an in-situ manner, marked as S@MXene. The stable suspension of a single layer or a few layers of two-dimensional transition metal carbide (nitride) MXene nanosheets is mixed with a sodium thiosulfate or sodium polysulfide solution; with formic acid as a reducing agent, the nano sulfur generated by the reaction uniformly grows on the surface of the two-dimensional MXene nanosheet; and the two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite is obtained through neutralization, washing and centrifugation and serves as the anode of a lithium-sulfur battery. According to the invention, a high-conductivity two-dimensional transition metal carbide (nitride) MXene nanosheet carrier is uniformly compounded with nano sulfur particles, introduction of a binder and a conductive agent is not needed, and the composite has excellent electrochemical performance as the anode of a lithium-sulfur battery; and moreover, the technology is simple and can meet the requirements of large-scale production.

A dispersible nanocomposite comprising nanotubes associated with nanoplatelets. A method for creating an exfoliated nanotubes solution, aligning nanotubes and depositing them on a substrate or in matrix. In one embodiment, the method includes a nanocomposite of at least one nanotube electrostatically associated with at least one nanoplatelet. The nanoplatelets may be removed from the suspension by altering the ionic strength to create an exfoliated nanotube solution. The exfoliated nanotube solution for injection into microchannel templates and aligned deposition.

Carbon nanoflakes, methods of making the nanoflakes, and applications of the carbon nanoflakes are provided. In some embodiments, the carbon nanoflakes are carbon nanosheets, which are less than 2 nm thick. The carbon nanoflakes may be made using RF-PECVD. Carbon nanoflakes may be useful as field emitters, for hydrogen storage applications, for sensors, and as catalyst supports.

The invention relates to a cobalt-intercalated molybdenum sulfide secondary battery material and a preparation method and an application thereof. A three-dimensional cobalt-intercalated molybdenum sulfide multi-level structure is prepared by adopting a chemical solution method; firstly, a cobalt salt, a molybdenum salt and a sulfur source are dispersed into a solvent to prepare a reaction liquid; and then the prepared reaction liquid is subjected to solvent thermal treatment to obtain the three-dimensional cobalt-uniformly-intercalated molybdenum sulfide multi-level structure which is self-assembled by graphene-like ultra-thin nanosheets, wherein the size of the multi-level structure is about 100nm. The invention also discloses a preparation method for the multi-level structure. The secondary battery material prepared by the method is stable in nanomaterial performance, and long in cycle life when the secondary battery material is used as a negative electrode material of a lithium ion battery and an electrode material of a supercapacitor.

A new method is disclosed for the exfoliation of hexagonal boron nitride into mono- and few-layered nanosheets (or nanoplatelets, nanomesh, nanoribbons). The method does not necessarily require high temperature or vacuum, but uses commercially available h-BN powders (or those derived from these materials, bulk crystals) and only requires wet chemical processing. The method is facile, cost efficient, and scalable. The resultant exfoliated h-BN is dispersible in an organic solvent or water thus amenable for solution processing for unique microelectronic or composite applications.

The invention discloses a copolymerization modified graphite-phase carbon nitride nanosheet visible-light-driven photocatalyst as well as a preparation method and an application thereof, and belongs to the technical field of material preparation and photocatalysis. The graphite-phase carbon nitride nanosheet visible-light-driven photocatalyst which adopts a nanosheet structure and synthesized with a copolymerization method is formed by taking urea and different small organic molecule monomers as precursors through the high-temperature copolymerization action. The prepared graphite-phase carbon nitride has a lower-dimension nanosheet microstructure and a proper band gap; compared with conventional bulk-phase carbon nitride, the graphite-phase carbon nitride effectively increases the specific surface area, enhances the utilization rate of sunlight, and has efficient photocatalysis hydrogen production performance in visible light. According to the copolymerization modified graphite-phase carbon nitride nanosheet visible-light-driven photocatalyst, the synthetic process is simple, the cost is low, the catalytic efficiency is high, the actual production requirements are met, and the photocatalyst has broad application prospects in the field of photocatalysis.

The invention relates to a titanium dioxide / graphene nanocomposite material, a preparation method of the nanocomposite material and application of the nanocomposite material in the field of energy source and cleaning environment. The graphene accounts for 1-25wt% and the balance is titanium dioxide. Morphology of the titanium dioxide is a mesoporous structure or a structure with a dominant high energy surface, and titanium dioxide is scattered uniformly on the surface of graphene. According to the invention, by adopting a titanium source and graphene as initial materials, and water or organic solvents as reaction solvents, the nanocomposite material with titanium dioxide with the mesoporous structure or a titanium dioxide nano sheet with the dominant high energy surface compounded with graphene can be obtained through hydrothermal synthesis or a hydrolysis reaction. The invention can be carried out in an aqueous solution system and the crystallinity of the product is high. The composite material can be applied to a cathode material of a power ion battery, has a higher charge-discharge capacity, is excellent in high current charge and discharge, stable in circulating performance, has very good photocatalytic performance and can be used to light degradation of organic pollutants and water photolysis for preparing hydrogen.

The invention relates to the technical field of nanometer materials and photocatalytic degradation of organic pollutants, and in particular relates to a Bi / BiOCl (bismuth oxychloride) composite photocatalyst as well as an in-situ reduction preparation method and application thereof. Bi nano-particles with particle sizes of 5-20nm are uniformly distributed on a BiOCl nanosheet with 100-600nm or a the surface of a BiOCl microsphere being 1-3 microns to obtain the Bi / BiOCl composite photocatalyst; the Bi / BiOCl composite photocatalyst is prepared by gaseous-phase in-situ reduction or liquid-phase in-situ reduction; as Bi nano-particles are formed on a BiOCl substrate in an in-situ manner, the lattice matching degree of interfaces between the Bi and the BiOCl is high and the charge migration is facilitated; the Bi nano-particles have the good dispersibility, are difficult to cause agglomeration, and have the good size and distribution controllability; the Bi nano-particles can be well combined with the BiOCl and are difficult to drop off, the photo catalytic capability of the BiOCl under the existence of ultraviolet light can be improved, the spectral response range is expanded, and the visible photo catalytic capability can be acquired, and the Bi / BiOCl composite photocatalyst can be effectively applied to photocatalytic degradation of organic pollutants in a water body.

The invention discloses a novel composite conductive agent, a lithium ion positive pole piece and a lithium ion negative pole piece made of the composite conductive agent, and a lithium ion battery containing the positive pole piece and the negative pole piece. By leading the novel composite conductive agent, the developed pole piece of which the surface has an effective conductive network can be prepared by adding a small amount of conductive agent, so that the prepared lithium ion has excellent rate discharging, low-temperature discharging, high-temperature storage and cyclic properties. The composite conductive agent comprises single-wall or fewer-wall carbon nanotubes and graphene nanosheets, wherein the specific surface area of each single-wall or fewer-wall carbon nanotube is 200 to 1500m<2> / g, the tube diameter is 1 to 10nm, and the tube length is greater than 5mu m; the diameter of each graphene nanosheet is 0.2 to 2mu m, the specific surface area is smaller than 1800m<2> / g, and the thickness is smaller than 2nm.

The invention discloses a preparation method of graphene, which is characterized in that natural graphite used as a raw material is subjected to mechanical stripping under the auxiliary action of graphene quantum dots by using a polar solvent as a dispersion medium to prepare the high-quality graphene. The stripping of the natural graphite and dispersion of the graphene nanosheets in the polar solvent are promoted by utilizing the favorable dispersivity of the graphene quantum dots in the polar solvent and the strong non-covalent bond combination between the graphene quantum dots and graphene / graphene laminae, thereby obtaining the high-quality graphene. According to the invention, the graphene powder is directly obtained from the natural graphite under the condition of not introducing any surfactant, inorganic salt, organic salt or any other impurity. Compared with the existing methods, the method is simple in technique, and can be perform in multiple polar solvents; the maximum yield of the obtained graphene can reach 50%, and the quality is good; the graphene quantum dots used for auxiliary stripping can be recycled; and thus, the method is very suitable for mass preparation of graphene.

A method that includes forming a patterned stack of materials comprising at least one channel semiconductor material layer and first and second layers of sacrificial material positioned above and below, respectively, the at least one channel semiconductor material layer, forming a replacement gate cavity above the patterned stack of materials and performing an etching process through the gate cavity to selectively remove at least a portion of the first and second layers of sacrificial material relative to the at least one channel semiconductor material layer. The method further includes performing a second etching process to form a reduced-thickness portion of the channel semiconductor material layer that has a final thickness that is less than the initial thickness and forming a replacement gate structure around at least the reduced-thickness portion of the channel semiconductor material layer.

The invention relates to a two-dimensional transition metal carbon (nitrogen) compound and two-dimensional transition metal sulfide nano-composite powder, and a preparation and application thereof. The nano-composite powder is formed by the uniform scattered recombination of a two-dimensional transition metal carbon (nitrogen) compound nanosheet and a two-dimensional transition metal sulfide nanosheet, wherein the percentage of the mass of the two-dimensional transition metal sulfide to the total mass of the nano-composite powder is 10%-99%. The method comprises the steps: enabling the steady suspension liquid of the two-dimensional transition metal carbon (nitrogen) compound nanosheet and the suspension liquid of the two-dimensional transition metal sulfide nanosheet are mixed according to a proportion; carrying out cooling and drying after supersonic mixing, and then obtaining the nano-composite powder. The nano-composite powder is simple in preparation, is safe and high in efficiency, is low in cost, remarkably irons out the defects of conductivity of the two-dimensional transition metal sulfide, and can regulate the conductivity through proportion change. The nano-composite powder serves as a negative electrode of a lithium ion battery and the electrode material of a supercapacitor, is good in application prospect in the field of energy storage devices, and is better in electrochemical performance than the two-dimensional transition metal sulfide.

The invention discloses a graphene-based nitrogen-doped hierachical-pore carbon nanosheet / sulfur composite material for a cathode of a lithium sulfur battery, as well as a preparation method and application of the graphene-based nitrogen-doped hierachical-pore carbon nanosheet / sulfur composite material. The carbon nanosheet is a graphene-based nitrogen-doped hierachical-pore carbon nanosheet, and is prepared by the steps of growing poly-pyrrole on graphene oxide in situ, performing carbonization at high temperature, activating by using potassium hydroxide and forming pores, wherein the graphene oxide and nano-silicon dioxide serve as double templates; the thickness of the carbon nanosheet is 10 to 25 nm; the specific surface area is 800 to 1,600 m<2> / g; the pore diameter of the carbon nanosheet is distributed into the range of 0.8 to 6 nm in a concentrated way; the structure of the carbon nanosheet is a sandwich-like type which adopts graphene as the interlayer of the carbon nanosheet. The carbon nanosheet with abundant micro-pores, meso-pores and large specific surface area can load more sulfur active substances and can effectively inhibit dissolution of polysulfide. The ultrathin nanosheet, and the micro-pores and meso-pores guarantee diffusion of electrolyte and transmission of ions. According to the structure, the capacity, the cycling stability, the coulombic efficiency and the rate performance of the carbon nanosheet / sulfur composition material applied to the lithium sulfur battery are improved synergistically.

The invention provides a graphene modified high-heat-conductivity aluminum-based composite material and a powder metallurgy preparation method thereof. The material comprises reinforced grains and an aluminum substrate, wherein the composite boundary of the reinforced grains and the aluminum substrate contains high-heat-conductivity graphene nanosheets. The method comprises the following steps: (1) soaking the reinforced grains with a strong acid solution, subsequently washing with deionized water till being neutral, drying, and removing the surface impurities, thereby obtaining activated reinforced grains; (2) adding the activated reinforced grains into a graphene dispersion liquid, mechanically stirring or performing ultrasonic dispersion, and wrapping the graphene nanosheets on the surface, thereby preparing the graphene modified reinforced grains; and (3) mixing the graphene modified reinforced grains with the aluminum substrate powder, pressing into blanks, and sintering, thereby preparing the graphene modified high-heat-conductivity aluminum-based composite material. The composite material provided by the invention is good in chemical stability, high in thermal conductivity and can be used as a heat management material of a large-power semiconductor device.

The invention relates to a preparation method and application method of a titanium dioxide nanosheet supported MIL-100 (Fe) composite photocatalysis material, belongs to the field of titanium dioxide photocatalysis, and especially relates to the field of titanium dioxide nanosheet supported porous metal organic skeleton (MOFs) composite materials. The preparation method comprises the following steps: 1, uniformly stirring tetrabutyl titanate and hydrofluoric acid at normal temperature, putting the obtained mixture in a hydrothermal reaction kettle, carrying out a reaction, separating the obtained material, washing the separated material, and drying the washed material to obtain titanium dioxide nanosheets; and 2, uniformly dispersing the titanium dioxide nanosheets in an anhydrous ethanol solution of iron trichloride, carrying out magnetic stirring at normal temperature for 15 min, carrying out suction filtration separation to obtain a product, dispersing the product in an anhydrous ethanol solution of trimesic acid, carrying out a 50-80 DEG C water bath reaction for 20-50 min, carrying out suction filtration separation to obtain a product, and repeating above processes in step 2 2-50 times to obtain the titanium dioxide nanosheet supported MIL-100 (Fe) composite photocatalysis material. The catalyst prepared through the method is especially suitable for catalytic degradation of high-concentration organic dyes (such as methylene blue) under visible light irritation) to reach a very high degradation rate.