1030 results about "Oxide composite" patented technology

The invention relates to the technical field of gas detection, in particular to a multi-gas accurate detection method and system.The method comprises the following steps that gas to be detected flows through a miniature gas enrichment device prepared through an MEMS technology under driving of a miniature gas pump, and target gas is adsorbed and enriched through graphene and metal oxide composite sensitive materials on the surface of a spiral gas inlet flow channel in the miniature gas enrichment device; the desorption concentrated gas is heated to the multi-gas composite detector, and the sensor array reacts with the gas to generate an electric signal; the data acquisition unit performs noise reduction, amplification and analog-to-digital conversion preprocessing on the electric signal; the data processing unit extracts characteristic vectors such as a response curve peak value and a rising slope; inputting the feature vector into a pre-trained machine learning classification-regression combined model, and outputting a gas type identifier and an initial concentration; error compensation is carried out in combination with environment temperature and humidity and a cross sensitivity interference mode library, and finally accurate information of at least nine gases is output. The device has the advantages of high sensitivity, strong anti-interference performance and miniaturization.

The present disclosure is directed to nanocomposites comprising a co-sintered composition of a MXene crystal form composition and an inorganic oxide, or oxide-type ceramic and methods of making and using the same.

The invention provides a polyaniline / modified graphene oxide composite material and a preparation method thereof. The preparation method comprises the following steps: dispersing purified graphene oxide, performing ultrasonic treatment, heating, adding a modifier for modification, centrifuging, taking precipitate, freezing, drying and grinding to obtain modified graphene oxide powder; mixing the powder with an aniline solution in doped acid to form a modified graphene oxide / aniline acid solution; dissolving ammonium persulfate in the doped acid to prepare an ammonium persulfate acid solution; and slowly dropwise adding the solution into the solution, carrying out in-situ polymerization, and carrying out suction filtration, washing and drying to obtain the composite material. According to the method, through chemical modification and in-situ polymerization processes, the problems that a single filler is poor in dispersity, a conductive network is discontinuous, and anti-corrosion and anti-static performance is difficult to synergistically improve are solved, and the process is simple and convenient and suitable for industrialization.

According to the Pt cluster catalyst, the preparation method and the application, an aluminum oxide composite metal oxide carrier is prepared by adopting a pH swing method, a defect oxide nano island is formed through high-temperature reduction treatment, and oxygen vacancies contained on the surface can firmly anchor a subsequently loaded Pt cluster, so that the coking phenomenon of the Pt-based catalyst is reduced, and the catalytic activity of the Pt-based catalyst is improved. The catalytic activity and the stability of the Pt cluster catalyst are obviously improved. Meanwhile, Pt clusters are prepared through a heating reflux method, so that the Pt clusters have high dispersity and rich active sites, the finally prepared Pt cluster catalyst is small in Pt particle size and high in atom utilization rate, and when the Pt cluster catalyst is used for catalyzing a dehydrogenation reaction of a liquid organic hydrogen carrier, the Pt cluster catalyst is weak in adsorption capacity to a product, and the catalytic activity of the liquid organic hydrogen carrier is improved. The catalyst can show high conversion rate and hydrogen release rate at low temperature, can still keep stable structure at high temperature, and provides an efficient and reliable solution for engineering application of an LOHC dehydrogenation link.

The invention provides an aerogel-based heat-preservation, heat-insulation and waterproof composite coating material for a building outer wall and a preparation method thereof, and belongs to the field of building materials. Through hydrophobic modified silicon dioxide aerogel, a lightweight heat insulation frame is provided, and the waterproofness and compatibility are improved; the mechanical property and the crack resistance are enhanced through the modified potassium titanate nanofibers, and self-adaptive heat insulation is achieved; the thermoelectric effect, the wear resistance and the thermal regulation performance are optimized through plasma treatment and polyaniline coated tungsten carbide nanoparticles; the heat management performance, the crack resistance and the comprehensive heat insulation and waterproof capacity are improved through graphene oxide composite modified boron nitride; the flexibility, the hydrophobicity and the interfacial compatibility are improved through organic silicon modified bisphenol A epoxy resin; and the performance of the coating is optimized through the synergistic effect of the components.

The invention relates to the field of functional fabrics, and provides a flame-retardant fabric with infrared shielding performance and a preparation method thereof, and the fabric is prepared from blended yarns of polyester composite fibers and surface modified polyimide composite fibers through a textile process. The polyester composite fiber comprises magnesium hydroxide / zinc oxide composite filler and is prepared through melt blending and spinning, and the surface modified polyimide composite fiber is obtained through basic zinc carbonate surface modification treatment. Zinc oxide particles and magnesium hydroxide nanowires in the magnesium hydroxide / zinc oxide composite filler have a synergistic effect, so that the flame retardance and the infrared shielding capability of the fiber are enhanced; the use of the surface modified graphene improves the mechanical and thermal stability of the polyimide fiber. By reasonably regulating and controlling the fiber proportion and weaving density, the fabric has excellent mechanical property, infrared shielding property and flame retardant property while ensuring the flexibility, and has wide application value.

An oxide composite positive electrode material coated with borate in situ, includes γAxByOz—NaaLibNicCudMneMfO2+β. In the material, Li, Ni, Cu, Mn, and element M for doping and substituting a transition metal site together occupy the position of transition metal ions in the crystal structure. The space group of the layered oxide composite positive electrode material is P63 / mmc or P63 / mcm or R3m, or the corresponding structure is a P2 phase or an O3 phase. AxByOz is a coating layer that has a needle-like structure and is generated in situ on the surface of NaaLibNicCudMneMfO2+β, being formed by, during a sintering process, coating a material precursor and a layered oxide precursor for generating NaaLibNicCudMneMfO2+β; γ is the mass fraction of the coating material precursor in the layered oxide precursor, 0.1 wt %≤γ≤10 wt %; and A is Li and / or Na.

The invention provides a nitrogen-rich organic molecule modified graphene oxide composite material as well as a preparation method and application thereof. The method comprises the following steps: adding graphene oxide into a polar organic solvent, and performing ultrasonic dispersion and uniform mixing to obtain a graphene oxide dispersion liquid; the nitrogen-rich organic molecule modified graphene oxide composite material is prepared by the following steps: adding graphene oxide into a reaction kettle, adding 3, 5-diamino-1, 2, 4-triazole, uniformly mixing, carrying out nucleophilic reaction under a weakly acidic heating condition, repeatedly washing a product with ethanol and pure water, and freeze-drying to obtain the nitrogen-rich organic molecule modified graphene oxide composite material, and the composite material is used as an adsorbent, has a stable structure and can efficiently adsorb heavy metal ions. Through modification of the nitrogen-rich organic matter, the adsorbent obtains richer groups and adsorption sites, and can show different adsorption capacities on inorganic metal cations through multiple adsorption mechanisms. An adsorption result shows that the adsorbent has excellent adsorption selectivity on low-concentration copper ions in an aqueous solution. Through multiple adsorption-desorption experiments, the composite material still shows excellent reutilization performance.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a nitrogen-doped carbon metal oxide composite material and a preparation method thereof, a negative electrode material, a negative electrode plate and a lithium ion battery. The nitrogen-doped carbon metal oxide composite material comprises Co2NiO4 with a hollow cubic structure, and a nitrogen element and a carbon element which are dispersed on the surface of the Co2NiO4. The material is good in conductivity, low in resistance and good in structural stability, volume expansion caused by Li < + > embedding in the circulation process can be relieved, the volume expansion effect in the material charging and discharging process can be inhibited, the electrode polarization effect can be reduced, and the charging and discharging specific capacity, the rate capability and the circulation stability of the material can be effectively improved.

The invention relates to a sludge biochar modified layered bimetallic oxide, and a preparation method and application thereof. The modified layered bimetallic oxide is prepared from the following main raw materials: domestic sewage aeration tank sludge, NaOH, Na2CO3, FeCl3. 6H2O and MnCl2. 4H2O. The domestic sewage aeration tank sludge is used for preparing dry sludge, the ferric chloride solution and the manganese chloride solution are used for preparing sludge composite layered double hydroxides, and the final layered bimetallic oxide composite sludge biochar catalyst can be prepared by calcining the sludge composite layered double hydroxides. The modified layered bimetallic oxide prepared by the scheme of the invention can effectively degrade bisphenol A, has relatively strong reusability, and still keeps good degradation ability in a relatively wide pH environment.

The invention relates to the field of fiber production, and particularly discloses a zinc oxide antibacterial ES fiber and a preparation method thereof. The zinc oxide antibacterial ES fiber comprises a core layer and a surface layer, and the surface layer comprises the following raw materials in parts by weight: 80-100 parts of polyethylene, 2-5 parts of a nano-zinc oxide composite material, 1-2 parts of a dispersing agent and 2-3 parts of a compatilizer; the nano-zinc oxide composite material is prepared from hydroxyapatite nanowires, a polyethylene glycol solution and coated nano-zinc oxide in a mass ratio of 1: (8-10): (1.5-2); the preparation method comprises the following steps: melting the material of the core layer to obtain a melt; mixing polyethylene, the nano-zinc oxide composite material, a dispersing agent and a compatilizer, and melting to obtain a polyethylene melt; and mixing the melt and the polyethylene melt, spinning, bundling, stretching, carrying out heat setting, curling and cutting off to obtain a finished product, the fiber has the advantages of being good in antibacterial property, high in mechanical strength, good in spinning stability and good in air permeability.

The invention belongs to the field of interface evaporation materials, and provides an interface evaporation material loaded with PDA / rGO photo-thermal hydrogel and a preparation method of the interface evaporation material. The PDA / rGO photo-thermal hydrogel loaded interface evaporation material is composed of a sponge material and PDA / rGO photo-thermal hydrogel loaded on the sponge material, and the PDA / rGO photo-thermal hydrogel is composed of calcium alginate hydrogel and a polydopamine / reduced graphene oxide composite material loaded in a polymer network of the calcium alginate hydrogel. The polydopamine / reduced graphene oxide composite material is prepared from reduced graphene oxide and polydopamine combined on the surface of the reduced graphene oxide; the interface evaporation material takes a sponge material as a porous skeleton, the PDA / rGO photo-thermal hydrogel is attached to the porous skeleton, and the interface evaporation material has a porous structure. According to the invention, the long-term use stability and evaporation flux of the existing hydrogel-based interface evaporation material can be improved.

The invention provides a wastewater advanced oxidation catalyst and a preparation method and application thereof, the wastewater advanced oxidation catalyst is of a core-shell structure, the core is activated carbon containing copper oxide and optional ferrous sulfide, and the shell is a silicon oxide-aluminum oxide compound containing nano ferrous sulfide. The invention further provides a preparation method of the wastewater advanced oxidation catalyst and application of the wastewater advanced oxidation catalyst in organic wastewater treatment. The wastewater advanced oxidation catalyst has the characteristics of high catalytic degradation capability on organic pollutants and the like, solves the problem of copper dissolution, and improves the long-term effectiveness of the catalyst.

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The invention relates to the technical field of soil remediation, in particular to a charcoal-fungus symbiont for a freeze-thaw environment and a preparation method and application of the charcoal-fungus symbiont. The preparation method of the charcoal-fungus symbiont comprises the following steps: crushing a biomass raw material, and carrying out pyrolysis to prepare basic charcoal; placing the basic biochar in an iron oxide solution, and carrying out an iron oxide loading reaction to obtain iron oxide biochar; the preparation method comprises the following steps: dipping iron oxide biochar in a chitosan solution for coating modification, then continuously adding a cross-linking agent for cross-linking solidification, and freeze-drying to obtain chitosan-iron oxide composite modified biochar; and immersing the chitosan-iron oxide composite modified biochar into a bacterial suspension of functional microorganisms, oscillating and adsorbing, and freeze-drying to obtain the carbon-bacteria symbiont. The invention aims to improve the heavy metal pollution phenomenon of soil and the soybean root rot disaster in the freezing and thawing cycle environment at the same time.

The invention relates to a preparation method of an etching-resistant and wear-resistant Y2O3-AlxOy composite coating. The preparation method comprises the following steps: carrying out ultrasonic cleaning on a corrosion-resistant matrix; performing plasma bombardment cleaning activation on the surface of the corrosion-resistant matrix; a Y2O3 coating and an AlxOy coating are alternately deposited on a corrosion-resistant base body in a double-target magnetron sputtering mode to form the Y2O3-AlxOy composite coating, the sputtering power of a Y target is larger than that of an Al target, and the ratio of x to y in the AlxOy coating is larger than 1. According to the method, the amorphous AlxOy coating dominated by the metal state is introduced into the Y2O3 coating, growth of Y2O3 columnar crystals is continuously broken, crystal grains are refined, formation of intergranular easy-to-etch point locations is inhibited, and an yttrium aluminum oxide composite strengthening phase is formed at an interface, so that plasma etching resistance is improved; the thickness of a single-layer coating in the composite coating is very thin; under the action of growth stress, the structure of the coating presents a wave-shaped microstructure and a soft and hard alternate mechanical structure, and the soft and hard alternate mechanical structure is beneficial to inhibiting generation of transverse cracks, guiding friction crack level expansion, prolonging the friction life of the coating and reducing the wear rate.

According to the emulsion mixing equipment applied to the mixing field and used for aluminum oxide composite fiberboard production, through a guide cylinder which forms an annular gap with the inner wall of a tank body in an enclosing mode and a stirring assembly arranged on the lower portion of the guide cylinder, raw materials circularly flow between the annular gap and an inner cavity of the guide cylinder, and the stirring assembly and a shearing assembly act synergistically; firstly, raw materials fully flow, components are promoted to be uniformly dispersed, local concentration difference is avoided, a foundation is laid for stable emulsification, agglomeration and precipitation are reduced, the emulsification efficiency and quality are improved, meanwhile, by means of a plurality of heat exchange structures such as a tank shell wall cooling clamping cavity, a spiral heat exchange pipe, an emulsification stator inner heat exchange channel and a guide cylinder shell wall spiral channel, sufficient heat exchange is achieved, and the emulsification efficiency and quality are improved. The raw material temperature is effectively controlled, heat accumulation and overheating are reduced, and the gelation probability is reduced.

The invention relates to an electrolytic copper foil anode plate electrode and a preparation process thereof, and belongs to the technical field of electrolytic copper foil production. The electrolytic copper foil anode plate electrode sequentially comprises a titanium substrate, an Ir-Ta oxide transition layer and an IrO2-RuO2-SnO2 oxide composite coating from inside to outside. The preparation process comprises the following steps: firstly, forming a micron-sized rough surface by utilizing acetone and ethanol ultrasonic cleaning and oxalic acid etching; the transition layer is subjected to sol dispersion and sintering treatment through polyethylene glycol, so that the balance of low porosity and high bonding strength is realized; the composite coating adopts an acetylacetone-ethylene glycol monomethyl ether solvent system, and a nanocrystalline structure is formed through step-by-step sintering; and an Ir-rich passivation layer is generated through electrochemical activation, and the finally obtained anode plate electrode has more excellent electrochemical activity and longer service life.

The invention discloses a two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst, which is prepared by the following steps: uniformly grinding glucose, ammonium nitrate and transition metal nitrate, calcining at high temperature to generate a two-dimensional metal oxide nanosheet, mixing the two-dimensional metal oxide nanosheet with surfactant modified reduced graphene oxide powder, and sintering at high temperature to obtain the two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst. And transferring into a high-pressure hydrothermal kettle for solvothermal reaction, so that the reduced graphene oxide and the two-dimensional metal oxide nanosheet are compounded to form the composite burning rate catalyst with a 2D-2D structure. Two two-dimensional materials are compounded through a solvothermal method, the defects of accumulation of reduced graphene oxide and aggregation of the two-dimensional metal oxide due to high surface energy are effectively avoided, meanwhile, the high conductivity of the reduced graphene oxide is utilized, the synergistic catalysis effect of the metal oxide and the carbon material is enhanced, and the performance of the composite material is improved. The composite material has a good catalytic effect on the thermal decomposition process of ammonium perchlorate.

The invention provides a preparation method and application of coating enhanced nano silver powder. The preparation method comprises the following steps: S1, preparing nano silver by taking silver nitrate as a silver source and polyethyleneimine as a reducing agent; s2, carrying out coating modification on the nano-silver by adopting aniline and ammonium persulfate under an acidic condition; s3, modifying the polyaniline coated nano-silver by adopting chloroacetic acid to obtain chloroacetic acid modified polyaniline coated nano-silver; s4, preparing a modified graphene oxide dispersion liquid; s5, partially reducing the graphene oxide; s6, partially reduced graphene oxide is adopted to load the chloroacetic acid modified polyaniline coated nano-silver, polyaniline coating and reduced graphene oxide compounding are carried out, and the dispersity and stability of nano-silver particles are effectively improved. The oxidation state of polyaniline promotes the release of silver ions through an electron transfer effect, so that the antibacterial effect is enhanced; and the partially reduced graphene oxide synergistically accelerates the release of silver ions, so that the antibacterial property is further improved.

The invention discloses a high-stability silicon monoxide lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: carrying out hydrothermal reaction on modified silicon monoxide micro powder and chromium nitrate nonahydrate to obtain MOF / silicon monoxide composite powder, and mixing the MOF / silicon monoxide composite powder with carbon nanotubes to obtain powder to be carbonized; and carbonizing the powder to be carbonized in a tubular furnace, and fluorinating with fluorine gas to obtain the high-stability silicon monoxide lithium ion battery negative electrode material. According to the preparation method, Cr-MOF coating is generated on the surface of the silicon monoxide powder in situ, agglomeration of the silicon monoxide powder is reduced, carbon nanotubes are evenly attached to Cr-MOF and then heated and carbonized, the carbon nanotubes are cured by a carbonization layer formed at a high temperature, the combination degree of the carbon nanotubes, a carbon layer and silicon monoxide is high, and the silicon monoxide powder is prepared. And under the synergistic effect with carbon fluoride formed by fluorination of fluorine, the stability of the silicon monoxide lithium battery negative electrode material is improved, the expansion rate of silicon monoxide is reduced, and the cycling stability of a lithium ion battery is improved.

The invention discloses a modified MoS2 / graphene oxide composite material and a preparation method thereof. The preparation method comprises the following steps: modifying commercial MoS2 by using a silane coupling agent to enable the commercial MoS2 to be positively charged, and then self-assembling with negatively charged graphene oxide to obtain the modified MoS2 / graphene oxide composite material. When the composite material is added into an epoxy resin solid coating as an additive, the friction coefficient can be effectively reduced, and the corrosion resistance can be improved.

The invention relates to the technical field of refractory materials, in particular to a preparation method of a zirconite ramming material for a glass kiln. Zirconite is adopted as refractory aggregate, fused cast fused alumina zirconia micro powder is adopted as refractory powder, aluminum oxide is adopted as an additive, a silica sol-aluminum oxide composite cementing agent replaces traditional silicate to serve as a binding agent, and the ramming material for the glass kiln is prepared through burdening, mixing, forming, drying and sintering. The zircon ramming material obtained through the process is low in sintering temperature, compact in structure, low in apparent porosity and high in strength, the technical standard of the zircon ramming material is met, the construction efficiency of a construction site is improved, and the cost of the zircon ramming material is reduced.

The invention discloses a high-entropy oxide composite negative electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium battery negative electrode materials, and the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, wherein the metal elements are at least five of a chromium element, an iron element, a nickel element, a manganese element, a molybdenum element, a copper element and a cerium element; the molar ratio of the metal element to the oxygen element is 3: 4; the high-entropy oxide composite negative electrode material is of a spinel structure. According to the prepared high-entropy oxide composite negative electrode material, the problems that a traditional negative electrode material is unstable in structure, poor in interface contact and short in cycle life are solved, the electrochemical performance is improved, and an all-solid-state lithium battery prepared from the high-entropy oxide composite negative electrode material shows high reversible specific capacity and excellent cycle stability.

The invention relates to a SiOC modified boron carbide-aluminum oxide composite material and a preparation method thereof. The SiOC modified boron carbide-aluminum oxide composite material comprises a porous structure boron carbide-aluminum oxide material and a SiOC layer coating and modifying the porous structure of the boron carbide-aluminum oxide material and the surfaces of boron carbide and aluminum oxide particles, the porosity of the boron carbide-aluminum oxide material with the porous structure is 20 to 40 percent.

The invention relates to the technical field of brake discs, in particular to a carbon-ceramic brake disc with a composite functional layer and a preparation method of the carbon-ceramic brake disc. The problems that a brake disc is insufficient in strength and poor in ablation resistance are solved. The preparation method comprises the following steps: carrying out low-temperature plasma treatment and silicon dioxide sol impregnation on carbon fibers, and inserting a graphene oxide film between woven layers, so as to obtain a carbon fiber preform; primary densification is carried out through pretreatment activation, low-temperature permeation and high-temperature permeation, and two graphitization treatments are combined; siliconizing is carried out through low-pressure permeation, high-pressure strengthening and laser cladding, and secondary densification is carried out through precursor impregnation and cracking; the titanium zirconium silicide-nano aluminum oxide composite layer generated through the embedding process forms a compact oxidation film at high temperature, and the silicon carbide nano crystal whiskers are subjected to chemical vapor deposition, so that the strength and ablation resistance of the prepared carbon ceramic brake disc are improved.

The invention discloses a preparation method of a high-orientation hydrophobic oxide antireflection film for a diamond infrared window, and belongs to the technical field of optical film preparation. The preparation method comprises the steps of diamond surface precision polishing, diamond surface acid boiling, magnetron sputtering and the like. According to the invention, the high-orientation oxide composite target material is adopted to prepare the high-orientation antireflection film, and a low-temperature and high-temperature alternate coating mode is adopted, so that the prepared antireflection film has the characteristics of slight hydrophobicity and high orientation; the synthesis process is good in process continuity and simple in synthesis process.

The invention discloses a sulfur iron oxide composite denitrification filler, a preparation method and application, and relates to the technical field of sewage treatment, the sulfur iron oxide composite denitrification filler comprises sulfur powder, siderite, magnesite, magnesium oxide, metal manganese, metal aluminum, nano iron, boric sludge, magnetite and a binder; wherein the sum of the addition amounts of the metal manganese, the metal aluminum and the nano iron accounts for 8-16% of the mass of the sulfur-iron oxide composite denitrification filler. The technical problems that in the prior art, strength and abrasion resistance are insufficient, and denitrification efficiency is low are solved.

The invention provides a preparation method and application of graphene in-situ growth CNT composite conductive slurry. The preparation method comprises the following steps: adding a sodium hydroxide solution into a graphene oxide composite salt solution for reaction, and performing suction filtration after the reaction is completed to obtain a graphene oxide composite catalyst; repeatedly cleaning with deionized water, drying, firing at high temperature, and crushing to obtain a catalyst; the preparation method comprises the following steps: putting a catalyst into a CVD (Chemical Vapor Deposition) tubular furnace, carrying out high-temperature reaction under the protection of inert gas in the whole process, sequentially introducing reducing gas and carbon source gas to obtain coarse carbon nanotube powder, and then carrying out high-temperature oxidation purification in air to obtain high-purity CNT powder; the preparation method comprises the following steps: fully dissolving a dispersant in a solvent, adding high-purity CNT powder, stirring, and carrying out high-pressure homogeneous dispersion. The graphene oxide is selected as a carrier of the carbon nanotube catalyst, so that the activity of the catalyst and the growth multiple of the carbon nanotube are improved, and the carbon nanotube powder with good conductivity is prepared on the surface of the graphene.