553results about "Zinc oxides/hydroxides" patented technology

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention belongs to the technical field of preparation of sensor materials, and particularly relates to a room-temperature formaldehyde sensor material based on a catalytic principle as well as preparation and application of the room-temperature formaldehyde sensor material. The polyphenol is adsorbed on the surface of the semiconductor metal oxide through chelation, then noble metal ions are introduced, and the polyphenol on the surface of the semiconductor metal oxide can capture the noble metal ions and reduce and stabilize the noble metal ions on the surface of the semiconductor metal oxide; the noble metal nanoparticles are anchored on the surfaces of the semiconductor metal oxide nanoparticles, the original morphology of the semiconductor metal oxide is maintained, and the noble metal nanoparticles are loaded on the surfaces of the semiconductor metal oxide nanoparticles. The nano composite material not only has the intrinsic electrical and thermodynamic properties of semiconductor metal oxide, but also combines the catalytic characteristics of noble metal nanoparticles, so that the lower detection limit of formaldehyde is reduced to 3ppb, and the sensitivity of the sensor is remarkably improved. The preparation method of the room-temperature formaldehyde sensing material is simple and suitable for large-scale production, the raw materials are simple and easy to obtain, the cost is low, and the materials are environment-friendly.

The invention relates to the field of gas sensors, and discloses a hydrogen sulfide gas sensor and a method for detecting the concentration of hydrogen sulfide in gas. The hydrogen sulfide gas sensor comprises a substrate and a gas sensitive material, a cavity is formed in the substrate, the gas-sensitive material is located above the cavity, and the two ends of the gas-sensitive material are connected with the gold electrodes on the substrate; the gas sensitive material comprises graphene fiber and metal oxide loaded on the graphene fiber. The metal oxide is selected from one or more than two of oxides of Zn, Cd, Cu, Ni, Pd, Pt, Co, Ir, Fe, Mn, Cr, Mo, W, V, Ti, Mg and Al; the specific surface area of the gas sensitive material is 80-150m < 2 > / g; the loading capacity of the metal oxide is 0.05 to 5 weight percent. The hydrogen sulfide gas sensor can be self-heated, has high sensitivity to hydrogen sulfide gas, and is suitable for being applied to the field of gas monitoring.

A nano composite, a nanoparticle ink composition including a solvent and the nanocomposite, and a light-emitting device including a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode, wherein the interlayer includes an emission layer, and at least one layer included in the interlayer is made from the nanoparticle ink composition. The nano composite includes: a metal oxide nanoparticle; and a chelating ligand bonded to a surface of the nanoparticle and including a cyclic moiety.

The invention discloses a method for green synthesis of a zinc oxide nanosheet from an aerospace mutant strain PS04-17. The invention provides a new application of a space mutant strain PS04-17 in green synthesis of zinc oxide nanosheets, research shows that the PS04-17 strain has efficient capability of converting zinc nitrate hexahydrate into zinc oxide nanosheets, the conversion efficiency is high, the generated zinc oxide nanosheets are flat and smooth in surface and clear in edge, the sheet structure is presented, and the zinc oxide nanosheets have good application prospects. And orderly vertical or staggered folding is realized. The zinc oxide nanosheets are synthesized through the aerospace mutant strain PS04-17, more possibilities are provided for a green and innovative synthesis method, more feasible schemes are provided for synthesis of nano-zinc oxide through a microbiological method, and the synthesis method is efficient, simple, convenient, safe, low in cost, environmentally friendly and suitable for industrial production. The prepared zinc oxide nanosheet can be better applied to the fields of agriculture, industry, medical treatment and the like.

The invention relates to a preparation method of a pectin-derived carbon-coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The method comprises the following steps: dropwise adding a tin tetrachloride solution and an acidified zinc oxide solution into a pectin solution to obtain a metal ion-pectin dispersion liquid; adding ammonia water to obtain a pectin precursor solution; freezing and solidifying with liquid nitrogen; and after freeze-drying, roasting for 3-5 hours to obtain the pectin derived carbon coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The reversible specific capacity of the obtained composite material reaches 1339 mA h g <-1 > after 100 cycles under the current density of 0.2 A g <-1 >.

The invention discloses a preparation method for regulating the morphology of zinc oxide, and belongs to the technical field of metal oxides, and the preparation method comprises the following steps: (1) preparing a zinc salt solution and an alkaline solution; (2) respectively inputting the zinc salt solution and the alkaline solution into an ultrasonic microreactor, enabling the zinc salt solution and the alkaline solution to be in contact in the conveying process in the ultrasonic microreactor, and reacting under the ultrasonic action to form zinc oxide slurry; and (3) outputting the zinc oxide slurry from the ultrasonic microreactor, filtering, washing, drying, crushing, and screening to obtain the zinc oxide powder. Controllable synthesis of nano-zinc oxide with different morphologies is realized by utilizing the super-strong mixing capacity of the ultrasonic pipeline reactor.

The present application belongs to the technical field of nanometer material, and discloses a kind of sheet porous nanometer zinc oxide and its preparation method and application.The present application first prepares basic zinc carbonate precursor, then nitrogen is passed into, the pressure of system is >0.4MPa and <0.6MPa, hydrothermal reaction is carried out, and the reaction product is calcined, and sheet porous nanometer zinc oxide is prepared.The sheet porous nanometer zinc oxide prepared by the method of the present application has uniform and regular sheet porous structure, the holes on the sheet are uniform and regular, dense, small in particle size, large in specific surface area, and can be widely applied in the degradation of organic pollutants in photocatalytic system and the field of heavy metal adsorption.The preparation method of the present application can obtain raw materials easily and can be mass-produced.

The invention discloses a composite electrocatalyst for electrochemical synthesis of H2O2 and a preparation method of the composite electrocatalyst, and belongs to the technical field of catalysts for electrochemical synthesis of hydrogen peroxide and preparation of the catalysts. The problems of low catalyst activity, selectivity and stability in the existing H2O2 electrochemical synthesis process are solved. The ZnO / porous carbon composite electrocatalyst is obtained by taking carbon spheres hydrothermally synthesized from glucose as a carbon source, taking eutectic salt of zinc chloride and potassium chloride as a zinc source and a pore-forming agent at the same time, mixing the carbon spheres and the eutectic salt, performing one-step pyrolysis treatment in an inert atmosphere, and completing carbonization, ZnO loading and porous structure construction. The electrocatalyst shows H2O2 selectivity up to 95% under an alkaline condition, high yield of 7.02 mol g <-1 > h <-1 > under 0.2 V vs RHE and excellent cycling stability, and the efficiency and practicability of electrochemical synthesis of H2O2 are remarkably improved.

The invention discloses a method for in-situ lossless repair of an attenuated lithium manganate positive electrode material, which specifically comprises the following steps: adding the attenuated lithium manganate material into a lithium hydroxide solution, supplementing lithium to an original value by a hydrothermal method, repairing the component and structure defects of attenuated LiMn2O4 by combining high-temperature roasting, and recycling and regenerating lithium manganate particles with severely attenuated capacity. The lithium manganate positive electrode material is directly recovered by the lossless method, and the chemical components and crystallinity of the invalid positive electrode material in various health states are reconstructed, so that the invalid positive electrode material can be repeatedly used in the lithium ion battery. Finally, the treated recycled powder material is coated by a metal organic framework (MOFs) self-assembly method, so that the electrochemical performance of the treated powder material is further improved. The method is simple, environmentally friendly and low in energy consumption, has obvious advantages compared with a traditional hydrometallurgy battery recovery method, and lays an important foundation for sustainable manufacturing of energy materials.

The invention discloses a preparation method of a lanthanum ferrite / zinc oxide composite material, which comprises the following steps: preparing lanthanum ferrite LFO, ultrasonically stirring ferric nitrate nonahydrate, lanthanum nitrate hexahydrate and a dispersing agent in a hydrothermal solvent to obtain a mixed solution, preparing an LFO / ZnO composite material, dispersing the LFO prepared in the step S1 and zinc acetate in ethanol, performing ultrasonic treatment, heating and stirring, and condensing and refluxing to obtain the LFO / ZnO composite material. Cooling, and continuously stirring in an ice-water bath; dropwise adding a NaOH ethanol solution at the temperature of 0 DEG C, and stirring for 2 hours; adding deionized water, stirring, centrifuging to remove the supernatant, dispersing the precipitate powder in ethanol, and carrying out hydrothermal reaction; after the hydrothermal reaction is finished, centrifuging the solution, and after centrifugation is finished, pouring out the solution to obtain a precipitate; washing with deionized water and an ethanol solution, drying the precipitate, and calcining the dried powder in a muffle furnace to obtain a p-n type LFO / ZnO composite material; according to the method, the size of lanthanum ferrite can be accurately regulated and controlled through a cooperative regulation strategy of the solvent proportion and the ligand size, and different types of gases can be accurately distinguished.

The invention relates to bark-like nano-zinc oxide and a preparation method thereof, and belongs to the technical field of liquid-phase synthesis of nano-zinc oxide. According to the invention, the nano zinc oxide material with bark-like microstructure is prepared by regulating and controlling the liquid phase environment and the thermodynamic and kinetic parameters of the reaction. The material has obvious layering sense and pore characteristics, the material is endowed with significantly enhanced physicochemical characteristics, for example, the BET specific surface area is significantly increased, and meanwhile, the high porosity and the nanocrystal boundary effect have a synergistic effect, so that active oxygen species and zinc ion antibacterial active species can be efficiently generated, and the antibacterial performance of the material is significantly improved. An antibacterial experiment shows that the antibacterial rate of the material to escherichia coli and staphylococcus aureus exceeds 99.9%, and the antibacterial rate of the material to candida albicans exceeds 99.0%. The material has application potential in the fields of medical dressings, antibacterial textiles, water purification and the like.

The invention discloses an electromagnetic wave absorbing material CoFe2O4 / ZnO-RGO with a ternary heterostructure as well as a preparation method and application of the electromagnetic wave absorbing material CoFe2O4 / ZnO-RGO, and belongs to the technical field of electromagnetic wave absorption. According to the material, a novel heterostructure with a multi-scale interface and a three-dimensional conductive network is constructed by compounding magnetic loss type CoFe2O4, dielectric loss type ZnO nanorods and resistance loss type RGO. Wherein the ZnO nanorod not only serves as a dielectric loss body, but also effectively enhances the structural anisotropy and the interface polarization effect of the material, and cooperates with the magnetic loss of CoFe2O4 and the resistance loss of RGO to jointly optimize impedance matching and improve the electromagnetic attenuation capability, so that the material shows excellent wave-absorbing performance under various thickness and even ultrathin conditions. The material source is wide, the cost is low, the preparation process is green, simple and convenient, the material is suitable for large-scale production, and an effective material solution is provided for electromagnetic wave absorption application in the national defense and civil fields.

The application discloses a zinc extraction process from secondary zinc oxide, and belongs to the technical field of zinc oxide preparation. In the rotary kiln roasting, composite porous flaky reducing carbon with waste paper, rice husk and wooden chips as main raw materials is used as a reducing agent. Compared with the commercially available anthracite, the composite porous flaky reducing carbon has low cost, realizes resource recycling, and has a large specific surface area and porous properties. A multi-level structure of flaky layers and pores is constructed, so that the contact sites of the composite porous flaky reducing carbon and the secondary zinc oxide are increased. The porous structure can avoid the caking of the material layer caused by the stacking and agglomeration of the flaky layers, and avoid the obstruction of gas flow, so that the pain points of the traditional reducing agent, such as local agglomeration and insufficient contact, are solved. The surface of the composite porous flaky reducing carbon is deposited with calcium oxide. The presence of the calcium oxide can react with a small amount of sulfur elements generated in the rotary kiln roasting process of the composite porous flaky reducing carbon, so as to generate calcium sulfate and reduce the content of sulfur dioxide.

A silicon-modified zinc oxide material, wherein the silicon-modified zinc oxide material (i) has a BET surface area of at least 50 m2 / g, (ii) has a Si:Zn atomic ratio in the range of 0.001 to 0.5:1 and (iii) is in the form of a shaped unit selected from a pellet, extrudate or granule, or a wash-coat on a monolith support. The silicon-modified zinc oxide material has improved resistance to thermal sintering and may be used as a catalyst or sorbent material.

This invention discloses a multifunctional composite flexible fabric with multiple functions including radiative cooling, energy harvesting, hydrophobicity, and antibacterial properties. The composite flexible fabric consists of several electrospun fiber layers, each formed sequentially by electrospinning in a top-to-bottom order. It includes at least two polymer electrospun fiber layers and at least one nanofunctional electrospun fiber layer, wherein the nanofunctional electrospun fiber layer serves as an intermediate sandwich layer, forming a sandwich structure with the polymer electrospun fiber layers located on the upper and lower surfaces. This invention also discloses a method for preparing this flexible fabric, using electrospinning to prepare it by electrospinning a PVDF or related polymer solution and a polymer solution modified with functional nanoparticles. This preparation method can effectively control the morphology of the nanofibers and the functions of the nanoparticles, enabling a synergistic effect between the functional nano-scattering particles and the nanofibers, resulting in an integrated functional fabric with thermal management, energy harvesting, and antibacterial properties.

The invention discloses an AgBr-loaded ZnO material, a preparation method of the AgBr-loaded ZnO material and an isopropanol sensor. The method comprises the following steps: firstly, dissolving glucose and urea in deionized water, uniformly stirring, and then adding a zinc source; carrying out hydrothermal reaction on the obtained solution, and firing a product to obtain a ZnO material; and dispersing a proper amount of ZnO powder into deionized water, sequentially adding a bromine source solution and a silver source solution, stirring, collecting a product, washing, and drying to obtain the AgBr-loaded ZnO material. According to the method, the concentration of oxygen adsorbed on the surface of ZnO is remarkably improved by utilizing the overflow effect of noble metal Ag and photoelectron transfer between AgBr and ZnO, so that the chemical reaction between the oxygen and isopropanol is promoted. The prepared AgBr-loaded ZnO material has the characteristics of high sensitivity, rapid response, low detection lower limit, good selectivity and the like for isopropanol gas at a relatively low working temperature.

This disclosure provides lithium supplement materials, including Li5Fe1-xMxO4 and a cladding layer disposed on a surface of Li5Fe1-xMxO4. In Li5Fe1-xMxO4, where M is at least one of Ni, Mn, Ru, Cr, Cu, Nb, Al, Mg, Ca, Ga, Ti, and Mo, and 0≤x≤0.2. The cladding layer includes M′-doped zinc oxide or M′-doped composite oxide based on zinc oxide, and M′is an ion capable of forming a substitutional solid solution with zinc oxide or composite oxide based on zinc oxide.

The invention discloses a method for modifying metal oxide through siloxane and application of the method, and belongs to the field of display. The method comprises the following steps: S1, dissolving a precursor of a metal oxide in a solvent, dropwise adding an alcoholic solution of alkali, stirring for reaction, and cleaning and drying a product to obtain metal oxide nanoparticles; s2, dissolving the metal oxide nanoparticles in water and / or alcohol to obtain a turbid liquid; and S3, adding a siloxane compound into the turbid liquid, and carrying out ultrasonic treatment, standing, filtering, cleaning and drying to obtain the siloxane-modified metal oxide nanoparticles. The modification method is simple, the performance is remarkably improved, the limitation of the traditional technology on the aspects of solution colloid stability and interface performance is broken through, and reliable technical guarantee is provided for preparation and application of novel photoelectric devices.

The invention provides a purification method of a metal oxide, a photoelectric device comprising the metal oxide and electronic equipment, in the purification method of the metal oxide, a first amine compound and a second amine compound are sequentially adopted to carry out ligand exchange on the metal oxide, so that the metal oxide is converted into an oil-phase metal oxide, therefore, impurities dissolved in the polar solvent are removed, and the purity of the metal oxide is improved; when the metal oxide prepared by the purification method of the metal oxide is applied to a photoelectric device, the service life of the photoelectric device is prolonged, and the performance stability of the photoelectric device is improved.

The invention belongs to the field of new materials, particularly relates to the technical field of infrared smoke screen interference, and particularly provides a heteroatom-doped porous flower-shaped zinc oxide microsphere infrared smoke screen interference material and a preparation method thereof.The heteroatom-doped porous flower-shaped zinc oxide microsphere infrared smoke screen interference material is of a flower-shaped structure and is formed by self-assembly of a large number of porous nanosheets; the preparation raw materials of the infrared smoke screen material are low in price and easy to obtain, the preparation process is easy to operate, the yield is high, and industrial production is easy. The material is relatively high in infrared shielding performance and has a relatively great application prospect in the field of infrared smoke screen interference materials in the future.

According to the non-irritant sunscreen skin care product composition and the preparation method thereof, the inorganic sunscreen core-shell particles can be highly dispersed and uniformly dispersed in the sunscreen emulsion, the sunscreen particles are matched with the emulsion, the effects of moisturizing, sunscreen, inflammation diminishing and whitening are achieved, and the non-irritant sunscreen skin care product composition is suitable for most skin types, safe, environmentally friendly and free of greasy feeling.

Preparation method and application of bismuth sulfide / zinc oxide heterojunction material, which solves the problem that the gas sensor prepared from Bi2S3-based heterostructure can only detect H2S gas under dark conditions, while there are still problems of low response value and poor selectivity under visible light conditions. Method: Synthesize Bi2S3 nanowires, and mechanically mix them with ZnO nanoparticles to form a Bi2S3 / ZnO heterostructure. Regulate the quantity of zinc oxide, change the electronic structure of bismuth sulfide, improve the surface adsorption active sites, and then improve the response value and selectivity for detecting H2S under room temperature visible light, and shorten the response time. After the surface of Bi2S3 nanowires is modified with ZnO in the present invention, it has a response value of 16.0 times for 500 ppb of H2S under room temperature visible light, the response time is only 51.6 s, and it has good selectivity, low cost and simple process, and is suitable for industrial production. It is used for rapid detection of H2S under room temperature and visible light conditions.

The zinc oxide particles are prepared as a dry powder by introducing defects into stoichiometric zinc oxide particles in a liquid carrier through a gas phase formed by a plasma process or by mechanical stress. The zinc oxide has an O:Zn ratio of at least 0.99, an average particle size of 10-300 nm, and a sufficient concentration of oxygen and zinc vacancies to impart an orange to tan color to a dispersion of the particles in a C12-C15 alkyl benzoate, corresponding to a ΔE value of at least 15 in the dispersion color test. The particles are free of aggregates and have no detectable particles larger than 500 nm on a number-weighted basis.

Low temperature synthesis, growth and doping methods and resulting materials are disclosed. According to an aspect, a method for material transformation includes providing a target material comprising carbon and / or hydrocarbon. The method also includes placing the target material within a fluid comprising a hydrogen source. Further, the method includes applying energy to the target material such that at least some of the target material is transformed to the same material with new beneficial bonding configuration.

The invention discloses a preparation method of graphene super-energy zinc oxide, and relates to the technical field of inorganic synthesis and nano material preparation. Comprising the steps of hydrothermal synthesis in a polar solvent system, wet precipitation, ultrasonic treatment and high-temperature roasting and ball milling. A comb-shaped functional additive is matched with an auxiliary agent to regulate and control a solvent environment, and ZnO with controllable morphology such as hexagonal prism / nanorod / nanowire is generated under a hydrothermal condition. And mixing the graphene with calcium carbonate and graphene to obtain the graphene super-energy zinc oxide. The rubber composition has excellent processability in the processing process, can effectively improve the production efficiency and ensure the stability of the product quality, and is suitable for producing and processing various rubber products, such as tires, rubber tubes, adhesive tapes, rubber shoes and the like.

The present invention relates to the technical field of microwave heating, and particularly relates to a zinc oxide or zinc oxide-based microwave heating material, a preparation method thereof, and an application thereof in microwave treatment of carbon-containing materials. The present invention synthesizes the microwave heating material zinc oxide by a simple method, and uses a zinc oxide matrix by screening a suitable preparation method, and constructs a zinc oxide-based composite material with a micro-nano structural morphology of needles, petals and rods by using a modifier, so as to effectively improve the microwave heating efficiency of a variety of inorganic metals or non-metallic materials with poor microwave transparency or heating effect, and realize its application in the microwave treatment process of carbon-containing materials. In addition, the method of the present invention can also realize various morphologies of the microwave heating material by adjusting the ratio and synthesis method between the components. The method of the present invention has a simple process, cheap and easily available raw materials, and is more conducive to industrial production.

The invention discloses a porous carbon material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing and reacting 10-30 parts by mass of wormwood, 20-40 parts by mass of phenol and 20-40 parts by mass of formaldehyde under an acidic condition to prepare resin; (2) under an alkaline condition, mixing 3-10 parts by mass of a zinc precursor and an alcohol solvent for reaction to prepare zinc oxide; and (3) mixing the zinc oxide-containing solution with resin for reaction, drying and calcining. The wormwood and the phenolic resin are compounded, the nitrogen-containing characteristic and the porous structure of the wormwood are utilized, a nitrogen-containing structure beneficial to the performance of the battery negative electrode material is formed, the first discharge specific capacity and the cycle stability are improved, and the phenolic resin is modified under the condition that a nitrogen source is not additionally introduced. By using an in-situ synthesis method of zinc oxide, the zinc oxide synchronously grows in wormwood / phenolic resin, the pore diameter is accurately regulated and controlled, pores are uniformly distributed in a material matrix, the adsorption performance is improved, and a good channel is provided for lithium ion transmission.

The invention belongs to the technical field of nano sensing and gas monitoring, and discloses an MXene / ZnO nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, etching Ti3AlC2 by using hydrochloric acid and lithium fluoride to obtain multi-layer two-dimensional MXene, and then carrying out ultrasonic stripping and freeze drying to obtain few-layer MXene; carrying out alkalization treatment on few layers of MXene, and then carrying out centrifugal cleaning to obtain 1D / 2D-MXene with a composite structure; the preparation method comprises the following steps: adding 1D / 2D-MXene and zinc acetate dihydrate into a mixed solution of water and ethanol, and carrying out a hydrothermal reaction; the preparation method comprises the following steps of: performing centrifugal cleaning and vacuum drying to obtain a multi-level 1D / 2D-MXene / 0D-ZnO nano-composite structure consisting of 0D-ZnO, 1D-MXene and 2D-MXene, and the multi-dimensional nano-composite structure is suitable for preparing a gas sensor and is used for detecting low-concentration nitrogen dioxide gas at room temperature. The nano composite material and the sensor prepared by the invention show excellent gas-sensitive performance on nitrogen dioxide gas, are high in sensitivity, can realize normal-temperature detection, and have relatively great application potential.