612 results about "Metal doped" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a gradient-doped lithium iron phosphate positive electrode material and a preparation method and application thereof. The invention provides a gradient doped lithium iron phosphate positive electrode material, on a particle cross section of the lithium iron phosphate positive electrode material, a particle center is taken as a circle center, a distance from the particle center to a nearest surface is taken as a radius R, a concentric circle region with a radius of 0.5 R is taken as a central region, and the rest part is a surface layer region, the metal doping amount of the central region is D1, the metal doping amount of the surface layer area is D2, D1 is larger than D2, delta D is equal to D1-D2, and delta D is larger than or equal to 2000 ppm and smaller than or equal to 4000 ppm. In the obtained lithium iron phosphate positive electrode material, sufficient compaction density can be ensured, the problem of poor dynamic performance of the positive electrode material can be well solved, and the discharge performance and rate capability of the lithium iron phosphate positive electrode material are effectively improved.

The invention relates to the technical field of solar cells, and provides a laminated cell and a manufacturing method thereof, which are at least beneficial to improving the efficiency of the laminated cell. The laminated cell comprises a crystalline silicon bottom cell, a middle layer and a perovskite top cell which are sequentially laminated in a preset direction, the middle layer comprises a conductive composite layer, the conductive composite layer is located on the surface, facing the perovskite top cell, of the crystalline silicon bottom cell, and materials of the conductive composite layer comprise a conductive polymer and a metal dopant; the metal grid layer is embedded into one side, far away from the crystalline silicon bottom battery, of the conductive composite layer, and the conductive composite layer exposes the surface, far away from the conductive composite layer, of the metal grid layer; the barrier layer is located on the side, away from the composite layer, of the metal grid layer and covers the surfaces of the metal grid layer and the conductive composite layer.

The invention relates to the technical field of preparation of positive electrode materials, in particular to a preparation method and application of a lithium iron phosphate material. The preparation method at least comprises a process of sintering a precursor material under a reduction condition to obtain the lithium iron phosphate material, wherein the precursor material at least comprises an iron source, a lithium source, a phosphorus source and a metal dopant, the mass ratio of the metal dopant is larger than or equal to 0, and the molar ratio of the iron element to the total phosphorus and the molar ratio of the doped metal to the total phosphorus are 0.96-0.97. According to the preparation method, generation of the iron phosphide (Fe3P, Fe2P, FeP and the like) impure phase is controlled from the burdening end by regulating and controlling the proportion of specific elements in the raw materials, so that preparation of the lithium iron phosphate material with high compaction and low iron phosphide impure phase is realized, and subsequent complicated impurity removal operation is avoided.

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention provides a metal doped silicon carbon negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: a modified amorphous carbon material and a metal silane precursor are respectively prepared, the particle size of the modified amorphous carbon material is 7-8 [mu] m, and the internal pore size of the modified amorphous carbon material is 0.1-10 nm; the modified amorphous carbon material is placed in a chemical vapor deposition reactor, nitrogen is introduced, the temperature is increased to 500-700 DEG C, then composite gas is introduced, the deposition reaction is carried out for 100-800 minutes, a pre-product is obtained, the composite gas comprises a metal silane precursor, doping auxiliary gas and acetylene gas, and the doping auxiliary gas is used for regulating and controlling growth of sediments; and heating the pre-product to 750-850 DEG C for 10-30 minutes, cooling the pre-product to 500-600 DEG C, introducing acetylene gas again, and keeping the temperature for 30-300 minutes to obtain the metal-doped silicon-carbon negative electrode material. Therefore, the electrochemical performance and the cycle life are effectively improved.

The invention discloses a carbon nitride-based composite material as well as a preparation method and application thereof. The carbon nitride-based composite material comprises a non-metal doped carbon nitride carrier and a noble metal, wherein the noble metal exists in the carrier in an element doping form and / or is loaded on the carrier in an oxide form; the precious metal is one or more of Pt, Pd, Au and Ru, and the nonmetal is one or more of P, S and I. According to the carbon nitride composite material disclosed by the invention, noble metal is utilized to modify carbon nitride, the number of surface active sites is increased, the electron and chemical structures of an active center are adjusted, and meanwhile, generation and migration of photo-generated charges are promoted. Meanwhile, the surface of the carbon nitride composite material is modified by non-metallic elements, so that adsorption and activation of reactant H2O molecules are effectively promoted. The catalyst disclosed by the invention is simple in preparation process, good in repeatability and easy for large-scale production.

The invention discloses a hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

An optical component includes a substrate and an anti-reflective film. The substrate has an aspherical surface through which light passes. The anti-reflective film is disposed at least on the aspherical surface and includes a nanostructure layer and an intermediate layer. The nanostructure layer includes ridge-like protrusions that are non-directionally extended. A bottom of the ridge-like protrusions is closer to the substrate than a top of the ridge-like protrusions. The ridge-like protrusions gradually taper from the bottom toward the top. An average structural height of the ridge-like protrusions ranges from 108 to 368 nm. The intermediate layer is between the nanostructure layer and the substrate. A main component of the nanostructure layer is aluminum oxide. The nanostructure layer includes a metallic doping agent at least partially distributed inside the ridge-like protrusions. The metallic doping agent includes at least one of titanium, vanadium, chromium, titanium oxide, vanadium oxide, and chromium oxide.

The invention relates to the technical field of photocatalysis, in particular to a Ni / Ga bimetal doped g-C3N4 nanotube composite material as well as a preparation method and application thereof. The Ni / Ga bimetal doped g-C3N4 nanotube composite material with the nitrogen vacancy is formed by doping Ni and Ga bimetals into the g-C3N4 nanotube and calcining the g-C3N4 nanotube in the air atmosphere to introduce the nitrogen vacancy. Nitrogen vacancies and double metal doping synergistically improve the efficiency of photocatalytic hydrogen production, because the Ni / Ga double metal doped g-C3N4 nanotube composite material with the nitrogen vacancies has a wider visible light absorption range, a lower carrier recombination rate, a higher electron transfer rate and higher stability, the composite material further has higher hydrogen production efficiency.

The invention discloses a preparation method of a metal doped type hydroxyapatite nanoflower. The method specifically comprises the following steps: dispersing a calcium source and soluble metal salt into water, adding acid phosphate, urea and L-histidine, uniformly mixing, carrying out a hydrothermal reaction, mechanically stirring, filtering, washing, and drying a hydrothermal system precipitate to obtain the corresponding metal-doped hydroxyapatite nanoflower. Compared with the prior art, the metal-doped hydroxyapatite nanoflower prepared by the preparation method disclosed by the invention is directly assembled by nanosheets, and a single metal type can be doped in a customized manner. According to the method, water is used as a unique solvent, the use of an organic solvent is avoided, the pH does not need to be adjusted in advance, the technological process is simple, operation is convenient, equipment investment is small, and the method is suitable for industrial production.

The invention relates to a lithium iron phosphate material, a preparation method thereof and a lithium ion battery, hydroxyl iron phosphate and hydroxyl iron phosphate containing metal doping elements are respectively used as phosphorus and iron sources to prepare a precursor, the compaction density of the lithium iron phosphate material is effectively improved based on a four-level grain size distribution design, and meanwhile, the capacity is ensured to be efficiently exerted. When the lithium iron phosphate material is used for preparing a lithium ion battery, the energy density, the rate capability and the cycle life of the battery can be remarkably improved, the development requirements of high-end application markets such as long endurance of electric automobiles and high efficiency of energy storage systems are met, and the lithium iron phosphate material has a good industrial application prospect.

Exemplary semiconductor processing methods may include depositing a metal-doped boron-containing material on a substrate disposed within a processing region of a semiconductor processing chamber. The metal-doped boron-containing material may include a metal dopant comprising tungsten. The substrate may include a silicon-containing material. The methods may include depositing one or more additional materials over the metal-doped boron-containing material. The one or more additional materials may include a patterned photoresist material. The methods may include transferring a pattern from the patterned photoresist material to the metal-doped boron-containing material. The methods may include etching the metal-doped boron-containing material with a chlorine-containing precursor. The methods may include etching the silicon-containing material with a fluorine-containing precursor. The metal dopant may enhance an etch rate of the silicon-containing material. The methods may include removing the metal-doped boron-containing material from the substrate with a halogen-containing precursor.

The invention belongs to the technical field of air purification, and discloses a nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2-graphene aerogel composite material as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: taking a nitrogen-containing organic heterocyclic ligand, a nitrogen doping agent, a non-noble metal salt compound and chitosan, carrying out a first hydrothermal reaction, carrying out tannic acid etching and first calcination treatment, carrying out MnO2 in-situ growth on the obtained nitrogen-doped MOF derived hollow porous carbon material, and introducing a rare earth metal salt compound to obtain the nitrogen-doped MOF derived hollow porous carbon material. And finally, taking the obtained nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2 composite material, graphene oxide and a reducing agent to carry out second hydrothermal reaction, ethanol soaking, freezing and freeze-drying treatment to obtain the nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2 composite material. The nitrogen-doped MOF-derived hollow porous carbon-rare earth metal doped MnO2-graphene aerogel composite material has excellent adsorption and catalytic degradation activity on TVOC (Total Volatile Organic Compounds) such as formaldehyde and the like, and the composite material has a good application prospect in air purification.

The invention discloses an NF-loaded high-valence metal doped-high-entropy layered double hydroxide / MOF composite material, and belongs to the technical field of high-entropy catalysts. A two-step hydrothermal method is adopted, firstly, a metal organic framework material (MOF) precursor Ni-MOF is prepared through the hydrothermal method, then a metal salt solution containing iron, zinc, cerium, cobalt and the like is prepared at the room temperature, the solution is fully stirred and subjected to ultrasonic uniformization and transferred into a high-pressure kettle, the precursor Ni-MOF is added, and the metal salt solution containing iron, zinc, cerium, cobalt and the like is obtained. And carrying out hydrothermal treatment, washing and drying to obtain the high-valence metal doped high-entropy layered double hydroxide / MOF composite material loaded on foamed nickel (NF). According to the technical scheme, due to the synergistic effect of the MOF and the high-entropy LDH, the MOF / LDHs have excellent electrochemical performance, and the introduction of the high-valence metal can regulate an electronic structure and expose rich active sites, so that the electrocatalytic activity of the MOF / LDHs is improved, and excellent HER, OER and UOR activities are obtained.

The invention discloses a solid electrolyte-coated silicon-carbon composite material and a preparation method thereof, and is characterized in that a negative electrode material has a core-shell structure, the core is metal-doped porous carbon and nano silicon deposited in pores, and the shell is a solid electrolyte complex. The preparation method comprises the following steps: uniformly mixing an emulsifier, a phenolic compound, an aldehyde compound, a cross-linking agent, a metal salt of the cross-linking agent and a template agent, then adding an oxidizing agent for reaction, and preparing metal-doped porous carbon through heteroatom doping and activation; depositing nano silicon through a vapor deposition method, coating the surface of the nano silicon with a solid electrolyte through a liquid phase method, and carbonizing to obtain the solid electrolyte coated silicon-carbon composite material. The obtained material has the characteristics of excellent fast charging performance, high initial efficiency and the like when applied to lithium ion batteries.

A device having: a multilayer composite phase change material structure with: a bottom PCM layer of a first SbTe PCM material having a first metallic doping; a first composite PCM layer on the bottom PCM layer, wherein the first composite PCM layer comprises at least: a first composite layer, comprising said first PCM material having a second metallic doping; and a second composite layer, comprising said first SbTe PCM material undoped, on the first composite layer; and a top PCM layer, comprising first SbTe PCM material having said first metallic doping, on the composite PCM layer. The first metallic doping can be identical to the second metallic doping. The first PCM material can comprise SbTe and the first and second metallic dopings can comprise one of Ge, In and GeIn.

The invention discloses a high-power silicon-carbon composite material as well as a preparation method and application thereof, and the preparation method comprises the following steps: preparing nano-metal particles, depositing amorphous carbon on the surfaces of the nano-metal particles through a vapor deposition method, and then carrying out acid pickling and core removal to obtain porous carbon; the preparation method comprises the following steps: preparing a silicon-carbon composite material, introducing silane gas and metal gas through a silane cracking method, depositing nano silicon and metal in pores of the silicon-carbon composite material, forming amorphous carbon on the surface of the silicon-carbon composite material, adding the amorphous carbon into a lithium sulfonate solution, and carrying out spray drying to obtain the lithium sulfonate-coated metal-doped silicon-carbon composite material. According to the obtained material, the electronic conductivity of the material is improved by doping metal in the inner core, the expansion is reduced by high-capacity porous carbon, and meanwhile, the lithium sulfonate coated on the outer layer has excellent solvation ability, so that the lithium ion transmission rate of the material is improved, and the rate capability is improved.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a composite sodium ferric sulfate positive electrode material, a sodium ion battery and a preparation method. The preparation method comprises the following steps: preparing a group IIIA metal doped composite sodium ferric sulfate precursor; mixing with a solution containing a sodium source, an iron source and a phosphorus source; and performing staged heat treatment under a protective atmosphere to form a pyrophosphate ferric phosphate sodium coating layer. The particle size D50 of the composite sodium ferric sulfate positive electrode material is 3-5 [mu] m, and the composite sodium ferric sulfate positive electrode material can inhibit iron dissolution and enhance structural stability through bulk phase doping and surface coating cooperation, can prolong the cycle life of a battery and reduce gas production, and is suitable for a high-performance sodium ion battery.

The invention relates to the technical field of electrochemistry, in particular to a core-shell fiber catalyst layer, a preparation method and application thereof, a membrane electrode and a zinc-air flow battery. The catalyst layer comprises a core layer with polymer nanofibers and a metal-doped COP catalyst coated on the core layer; the catalyst layer has electrical conductivity. The core-shell fiber catalyst layer has the flexibility and pore structure of a nanofiber membrane, and the porous structure can accelerate substance transfer, so that active substances can be quickly diffused to active sites, and the reaction rate is further accelerated.

The invention relates to the field of perovskite type oxide materials, in particular to a transition metal doped perovskite type oxide and a preparation method and application thereof. The invention relates to a transition metal doped perovskite type oxide, the chemical general formula of which is LaFe1-xMxO3, M is at least one of Al, Co, Ni and Zn, and 0 lt; < = 0.3; the transition metal doped perovskite type oxide has a cubic perovskite structure, and a 3d orbit of B-site doped metal and a 2p orbit of O form covalent interaction through hybridization. According to the invention, the conductivity and electrochemical performance of the perovskite type oxide are improved, the problem of material agglomeration is solved by optimizing the preparation process, and a new solution is provided for the application of high-performance battery materials such as nickel-metal hydride batteries.

The invention discloses a metal-doped nitride heterojunction catalyst, a preparation method thereof and application of a lithium / sodium-sulfur battery, and belongs to the field of alkali metal sulfur-based battery electrocatalyst materials. The preparation method comprises the following steps: (1) dissolving cobalt nitrate, ammonium molybdate, ammonium chloride and urea in deionized water according to a molar mass ratio of 12.8: 1.6: 8: 8; (2) heating in an oil bath at 100 DEG C for 2 hours in an argon atmosphere to obtain a purple clear solution; and (3) centrifugally washing the precipitate with deionized water for three times, freeze-drying to obtain a purple floccule, and calcining the purple floccule in a mixed atmosphere of ammonia gas and argon gas in a ratio of 1: 4 at 700 DEG C for 3 hours to obtain the metal-doped nitride heterojunction catalyst. The method is low in production cost and simple in manufacturing process, and the catalytic material has the advantages of high energy density, long cycle life and the like when applied to lithium / sodium-sulfur batteries.

The invention belongs to the technical field of battery materials, and provides a doped sulfide solid electrolyte and a preparation method and application thereof, the doped sulfide solid electrolyte comprises an oxide containing a metal element A as a dopant; the atomic valence electron layer of A is fully filled with soft acid elements; in the doped sulfide solid electrolyte, the valence state of A does not exceed + 3. By doping the oxide of specific A, the soft acid element A is more easily and preferentially combined with the soft alkali S < 2-> to replace P and form an A-S covalent bond with polarity higher than that of P-S, so that the air stability of the sulfide solid electrolyte is improved, and the hydrolysis of the sulfide electrolyte is effectively inhibited; meanwhile, the specific electron arrangement structure of the metal element A is fully filled with a valence electron layer, the stability is high, and the oxidation resistance of the sulfide solid electrolyte can be effectively improved. And A is in a relatively low valence state in the doped sulfide solid electrolyte, so that the influence of a high-valence metal doped element is avoided.

A method for forming a coating on a substrate formed from zinc sulfide (ZnS) is provided. A ZnS film is grown on the substrate with a radio frequency sputtering process and metal dopants are sputtered on the substrate with a high-power impulse magnetron sputtering process. The metal dopants can be molybdenum or tungsten and simultaneously sputtered while growing the ZnS film. The sputtering ionizes the coating where the coating has a sheet resistance that is less than 50 ohm / square and the metal dopants form n-type dopants in the ZnS film. The metal dopants can be formed at a concentration that varies with a thickness of the ZnS film. At a first thickness, the concentration is at a first concentration and at a second thickness greater than the first thickness, the concentration is at a second concentration less than the first concentration.

The invention provides an anion-cation co-doped solid electrolyte, a preparation method thereof, a solid-state battery and electric equipment, and relates to the field of solid electrolytes. The general chemical formula of the anion-cation co-doped solid electrolyte is Li < 2 + > (4-m) x Zr < 1-x > M < x > X < 6-ayAy, 0 < x < = 0.4, 0 < y < = 0.8, m is the valence state of M, and a is the valence state of A; m comprises a metal doping element with the ion radius larger than that of Zr < 4 + > and the valence state lower than that of Zr; x comprises a halogen element; a comprises one or more of O, S, N and P; the ion radius of A is smaller than X; the valence state of M comprises + 2 and / or + 3. The Li2ZrX6 solid electrolyte is subjected to anion and cation co-ion doping, so that the disorder degree of a crystal structure can be increased, a Li < + > transmission channel is widened, and the ionic conductivity is improved.

The present invention discloses a boron-containing, high-temperature-resistant, near-stoichiometric silicon carbide fiber and a preparation method thereof. The preparation method includes a spinning stage, an infusibility stage, a pre-sintering stage, a densification sintering stage, and a nitriding stage, and is characterized in that: in the infusibility stage, the metal-doped polycarbosilane precursor fiber obtained in the spinning stage is subjected to a boron-doping reaction in an atmosphere containing boron trichloride and a cross-linking reaction in an atmosphere of a gaseous hydrocarbon having a carbon-carbon double bond. The method is simple to operate, has high production efficiency, low production cost, and is easy to use for large-scale industrial production. The prepared boron-containing, high-temperature-resistant, near-stoichiometric silicon carbide fiber has the advantages of low oxygen content, high degree of densification, few defects, stable structure, high tensile strength modulus, large grain size, and good high-temperature resistance, oxidation resistance, and creep resistance.

The invention provides metal-hydrogen modified porous carbon and a preparation method thereof, a silicon-carbon composite material and a preparation method thereof, and a battery, and the preparation method of the metal-hydrogen modified porous carbon comprises the following steps: mixing an aldehyde compound, a phenolic compound, a metal source and a catalyst, and carrying out heating treatment to prepare modified phenolic resin; carrying out carbonization treatment on the modified phenolic resin to prepare metal-doped porous carbon; mixing the metal-doped porous carbon with a metal hydride reducing agent, and performing reduction treatment to prepare metal-hydrogen modified porous carbon; wherein the mass ratio of metal elements to phenolic compounds in the metal source is (2-5): 100. A proper amount of metal-hydrogen bonds are introduced into the inner surface of a porous carbon pore structure; when the porous carbon is subsequently subjected to silicon deposition, low-temperature, uniform and confined deposition of nano silicon in a porous carbon matrix is facilitated, and the silicon-carbon composite material with low expansion rate and excellent electrochemical performance is prepared.

The preparation method comprises the following steps: mixing a lithium source, an iron source, a phosphorus source, a first carbon source and a first metal doping agent according to a preset proportion, carrying out primary high-temperature sintering, carrying out first-layer carbon coating and metal doping, and obtaining a primary sintered material; mixing the primary sintered material with a second carbon source and a second metal doping agent by a solid phase dry method, performing secondary sintering, performing secondary carbon coating and metal doping to obtain a target product, and finally crushing, sieving and deironing the target product to obtain the double-layer carbon-coated lithium iron phosphate material. A lithium source, an iron source, a phosphorus source, a carbon source and a metal doping agent are mixed and sintered by adopting a solid-phase mixing method and a simple carbon coating process to obtain a target product. The double-layer carbon-coated lithium iron phosphate material prepared by the method has high compaction density and high capacity, the coating uniformity of the carbon layer on the surface of the material is improved, and the conductivity is improved.

The present invention relates to a bioelectrochemical device for treating soy sauce wastewater and a preparation method thereof. The bioelectrochemical device comprises an anode chamber and a cathode chamber, wherein a columnar anode is disposed at the center of the anode chamber; a columnar cathode is disposed at the center of the cathode chamber; the space between the columnar anode and the anode chamber is filled with a modified conductive oxidizing filler; electroactive bacteria grow on the columnar anode and the modified conductive oxidizing filler, and the modified conductive oxidizing filler is metal-doped activated carbon. The metal-doped activated carbon is formed by mixing the activated carbon with a mixed solution of zinc sulfate and potassium sulfate, adsorbing the zinc sulfate and potassium sulfate onto the activated carbon, and then calcining the activated carbon to form corresponding metal oxides on the surface of the activated carbon. Due to the introduction of metallic potassium and metallic zinc, the metallic potassium and metallic zinc have electronic interaction and synergistic effects, thereby improving electronic conductivity and promoting degradation treatment of the soy sauce wastewater.

The invention relates to the technical field of environmental governance, and particularly discloses a bismuth ferrite-based photo-Fenton catalyst and application thereof. The bismuth ferrite-based photo-Fenton catalyst comprises a bismuth ferrite matrix or a catalyst, the bismuth ferrite matrix comprises Fe (NO) 9HO and Bi (NO) 5HO in a molar ratio of 1: 1-1: 1.1, the catalyst is one of metal-doped bismuth ferrite, non-metal-doped bismuth ferrite or a bismuth ferrite composite material, and the loading amount of metal in the metal-doped bismuth ferrite is 0.5-5 wt%. Fe (NO) 9HO and Bi (NO) 5HO are adopted as precursors, the stoichiometric ratio of a bismuth ferrite matrix can be regulated and controlled, generation of impurity phases is inhibited, and it is ensured that the matrix has a complete perovskite structure and a good photoresponse characteristic; meanwhile, modification means such as metal doping, non-metal doping or composite carrier loading are adopted.

The invention discloses a high-stability magnetic liquid and a preparation method thereof, and belongs to the field of magnetic fluid nano functional materials related to ships. The magnetic liquid comprises a metal-doped iron oxide nano-particle core, a double-layer surface modification layer composed of oleic acid and a silane coupling agent, and a composite carrier liquid formed by compounding poly-alpha olefin synthetic oil and perfluoropolyether and adding nano-diamond. The preparation method comprises the following steps: firstly, coprecipitating and calcining to obtain metal-doped iron oxide nanoparticles, then carrying out double-layer coating modification, and finally carrying out mixed ball milling, ultrasonic treatment and magnetic separation purification on the metal-doped iron oxide nanoparticles and the composite carrier liquid. The saturation magnetization intensity of the magnetic liquid reaches 92-95 emu / g, the magnetic liquid can work for a long time under the high-temperature working condition, the heat conductivity coefficient is increased by 2-3 times, and the redispersibility is excellent. The problems that a traditional magnetic fluid is low in magnetic performance, prone to failure at high temperature, poor in dispersion stability and the like are solved, and the magnetic fluid is suitable for aerospace, high-end manufacturing, ship propulsion and other extreme scenes.