114 results about "Metal ion doping" patented technology

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 relates to a method for optimizing electroplating and etching process parameters, which comprises the following steps of: establishing an interface migration behavior relationship by analyzing the influence of metal ions, doped impurities and surface roughness factors on a reaction interface migration rate and a boundary layer flow behavior in an electroplating and etching process; interface migration behaviors are combined with parameter sensitivity analysis, the influence of process parameters on the interface behaviors is dynamically evaluated, and priority optimization sorting is carried out; dynamic interval zooming is carried out on the sensitive parameters by using the fitted sensitivity function, and a local adjustment range is generated according to material types and graph complexity; a preorder process memory mapping relation is introduced, and morphology evolution information recorded in the electroplating process is transmitted to an etching parameter optimization module; local fine adjustment is carried out on the etching rate, angle control and a disturbance mechanism, and the previous electroplating state is responded; collecting a fluctuation interface feedback signal; establishing a closed-loop optimization control loop of micro-disturbance, response evaluation and parameter correction; and the process consistency and the structure uniformity are improved.

The invention discloses light-driven toxin-enriched composite hydrogel as well as a preparation method and application thereof. The composite hydrogel comprises light-driven hydrogel and detection hydrogel, the light-driven hydrogel is agarose hydrogel doped with Au (at) Ag core-shell nano particles; the detection hydrogel is a double strand formed by an okadaic acid aptamer and a complementary sequence cDNA thereof, and a double strand formed by a domoic acid aptamer and a complementary sequence DNAzyme thereof, the hairpin H1 is used for modifying a quenching group BHQ2 at the 3'end, the hairpin H2 is used for modifying a fluorophore Cy3 at the neck part, the hairpin H3 is used for modifying a fluorophore FAM and a quenching group BHQ1 at the two ends respectively, and the metal ion doped agarose hydrogel is used for catalyzing DNAzyme cyclic shearing; and the photo-thermal driving unit is positioned on the detection function unit. According to the present invention, with the composite system of upper layer photo-thermal enrichment and lower layer dual-signal detection, the rapid and high-sensitivity simultaneous detection of the okadaic acid and the domoic acid is achieved through the combination of the photo-thermal transpiration effect and the HCR and DNAzyme cyclic shearing reaction;

The invention provides application of a metal ion doped aminated graphene oxide membrane material in catalyzing CO2 to synthesize cyclic carbonate. The metal ion doped aminated graphene oxide membrane material has an acidic catalytic site and an alkaline catalytic site at the same time, and a two-dimensional interlayer channel of the metal ion doped aminated graphene oxide membrane material also has a confinement effect. In the process of catalyzing a CO2 / epoxy compound cycloaddition reaction, epoxy compound molecules entering a two-dimensional interlayer confinement channel of the metal ion doped aminated graphene oxide membrane material are subjected to efficient ring opening under the combined action of organic amine molecules and metal ions and react with CO2; and finally, realizing CO2 high-efficiency (the reaction time is less than or equal to 5 minutes, and the conversion rate of the epoxy compound is 75-100%) synthesis of the cyclic carbonate under the conditions of room temperature and low pressure (greater than 0.1 MPa and less than or equal to 1 MPa).

This invention discloses a core-shell structured lithium-rich manganese-based cathode material with the general formula Li. 1+a Mn x Co y Ni z O 2‑b‑d (XO c ) b X d It has a core-shell structure, with the core being a disordered polyanion-doped lithium-rich manganese-based material, Li. 1+a Mn x Co y Ni z O 2‑b (XO c ) b The outer shell is made of lithium-rich manganese-based material Li, which is doped with gradient non-metallic ions. 1+ a Mn x Co y Ni z O 2‑d X d This application also provides a method for preparing a core-shell structured lithium-rich manganese-based cathode material. The method employs a combination of rapid Joule heating and surface plasma cleaning to prepare the aforementioned core-shell structured lithium-rich manganese-based cathode material, achieving a bulk disordered structure design with polyanion doping and a core-shell structure with surface gradient non-metallic ion doping. Specifically, the bulk polyanions can immobilize transition metal elements to suppress their migration to the lithium layer, reducing harmful consumption of active sites and stabilizing the crystal structure. Furthermore, the strong bond energy between the surface non-metallic elements and the transition metal elements can suppress transition metal dissolution during cycling, reducing irreversible oxygen oxidation and inhibiting harmful phase transitions.

The invention discloses an O3-P2 layered double-phase sodium ion battery positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The chemical formula is Na (1.0-x) MxNiaMnbMe1-a-bO2, x is more than 0 and less than 0.5, a is more than 0.1 and less than 0.9, b is more than 0.1 and less than 0.9, a + b is more than 0.2 and less than 1, M is a metal element, and Me is a transition metal element. Through doping of metal ions, an impurity phase component in an original positive electrode material is converted into a layered P2 phase component, and the O3 and P2 layered two-phase sodium ion battery positive electrode material is formed. The composite phase structure obtained through metal ion doping enhances the structural stability of the material, so that the positive electrode material has the advantages of low cost, low strain, high capacity, good cycling stability and rate capability, simple preparation process, high repeatability and great potential for large-scale production.

The disclosure provides a metal ion doped lithium iron phosphate material and a preparation method and application thereof, and relates to the technical field of lithium batteries. The metal ion doped lithium iron phosphate material comprises flaky lithium iron phosphate and metal ions doped on the flaky lithium iron phosphate, and the flaky lithium iron phosphate has a porous structure. The method comprises the following steps: using an organic metal compound as a deposition raw material to deposit a carbon layer and metal oxide particles on the surface of a porous Fe2O3 flaky precursor to obtain a composite material; mixing the composite material, a lithium source and a phosphorus source according to a stoichiometric ratio, and then drying and sintering to obtain an M-LiFePO4 material. The M-LiFePO4 prepared by the disclosure has good uniformity and is not prone to agglomeration, inherits the two-dimensional flaky morphology of the precursor material and has a porous structure, has good rapid charging and discharging capacity, and improves the rate performance of the lithium iron phosphate material through doping of metal ions.

The invention discloses a defect regulation and control method for improving the phase stability of inorganic perovskite CsPbI3, and the method comprises the steps: firstly constructing different defect models for CsPbI3, carrying out the structural optimization of the defect models and an initial CsPbI3 structure, carrying out the calculation of a phase change barrier based on the optimized structure, determining the influence of the atom vacancy defect concentration on the stability, and carrying out the calculation of the phase change barrier. The method comprises the following steps: firstly, selecting a CsPbI3 model, then, carrying out metal ion doping replacement on the initial CsPbI3 model, carrying out structure optimization on the replaced model, finally, carrying out formation energy calculation on the optimized structure, and determining the optimal doped and replaced metal ion, thereby completing the defect regulation and control of the CsPbI3 phase stability. According to the scheme of the invention, based on the formation of the metal ions capable of determining the optimal doping and replacement of the inorganic perovskite CsPbI3 material, the optimal regulation and control of the defects of the inorganic perovskite CsPbI3 material are realized, the service life of the perovskite solar cell is remarkably prolonged, the solar cell is enabled to convert solar energy into electric energy more effectively, and the efficiency of the solar cell is improved. The power generation capability of the solar cell is improved, and the cost is effectively saved.

The invention discloses a high-performance long-cycle lithium iron phosphate positive electrode material and a preparation method thereof, and solves the technical problem of poor long cycle performance of existing lithium iron phosphate due to non-uniform and unstable carbon layer network. The preparation method comprises the following steps: S1, mixing and ball-milling iron phosphate A and iron phosphate B with different specific surface areas, lithium carbonate, a carbon source, an organic polymer dispersant and a metal ion doping agent to form precursor slurry; s2, drying the precursor slurry to obtain a precursor yellow material; s3, performing primary calcination on the precursor yellow material in an inert gas atmosphere to obtain lithium iron phosphate powder, and crushing the lithium iron phosphate powder; s4, uniformly mixing the crushed lithium iron phosphate with a carbon source, a nitrogen-containing organic matter and a metal ion doping agent, and carrying out spray drying after ball milling; and S5, carrying out secondary calcination on the spray-dried material in an inert gas atmosphere to obtain the lithium iron phosphate with the nitrogen atom-doped carbon coating layer. The lithium iron phosphate positive electrode material has the advantages of stable structure, good long cycle performance and the like.

The invention relates to a preparation method and application of a tooth antibacterial and mineralized dual-function anti-caries material. The anti-caries material provided by the invention comprises two components, namely a mineralizing solution I and a mineralizing solution II. The mineralization liquid I contains polyelectrolyte and soluble salt of antibacterial metal cations; and the mineralization liquid II contains phosphate and fluoride. The pH values of the two mineralizing solutions are both 9.5 + / -0.5. During use, the surface of a demineralized tooth is firstly cleaned, the mineralizing liquid I and the mineralizing liquid II are sequentially coated, flushing is performed after each action for 15 minutes, 1-3 cycles are performed every day, and continuous treatment is performed for 7-14 days. Through polyelectrolyte template guiding and antibacterial metal ion doping, a biomimetic mineralization layer with an antibacterial function is formed on the surface of the demineralized tooth, and the dual functions of antibacterial and remineralization are achieved. The material can significantly recover the mechanical properties of teeth, the elastic modulus and hardness recovery rates respectively reach 68.6% and 62.5%, the dental caries score is reduced by 70% or more, and the dental caries prevention material has an excellent dental caries prevention effect and a clinical application prospect.

The application provides a positive electrode material and a preparation method thereof, an electrochemical device and an electronic equipment, and particularly relates to the technical field of batteries. 1+x M 1‑x O2, wherein 0 3+ and Zr 4+ , the anion includes F ‑ , and the alkali metal ion includes Na + . The application can effectively improve the problems of low first coulomb efficiency, serious voltage attenuation and poor safety of the lithium-rich layered positive electrode material.

The invention discloses a high-capacity aromatic pinene formaldehyde adsorbent and a preparation method thereof, the adsorbent comprises a meso-porous silicon substrate, pinene covalently grafted on the meso-porous silicon substrate and metal ions doped in the meso-porous silicon substrate, pinene is alpha-pinene or beta-pinene, the pinene and hydroxyl contained in the meso-porous silicon substrate form a covalent bond through a silane coupling agent, and the metal ions are doped in the meso-porous silicon substrate. The grafting amount of pinene is 5-15 wt%, the metal ions are one or more of Zn < 2 + >, Cu < 2 + > and Ni < 2 + > and exist in the form of metal oxides or metal hydroxylates, and the doping amount of the metal ions is 0.5-3 wt%.

The invention discloses an alkylation catalyst and application thereof in raspberry ketone synthesis, and the preparation method of the catalyst comprises the following steps: (1) pretreatment: washing ion exchange resin with an alcohol solvent to remove impurities, and drying to obtain pretreated resin; (2) hydrophobization treatment: carrying out hydrophobization treatment on the resin pretreated in the step (1) and silane, and then washing and drying to obtain hydrophobized modified resin; and (3) metal ion doping: dipping the hydrophobic modified resin in a metal ion solution for doping, and then filtering, washing and drying to obtain the modified acidic cation exchange resin catalyst. When the catalyst is applied to raspberry ketone synthesis, the catalytic activity, the selectivity and the stability of the catalyst are superior to those of a traditional method and an unmodified catalyst, and the catalyst has remarkable industrial application value.

The invention relates to a preparation method and antibacterial application of an adjustable manganese-based Prussian blue analogue. Through metal ion doping and lattice engineering regulation and control, a manganese element is introduced into a Prussian blue frame structure, and controllable regulation of the doping amount and optimization of a crystal structure are realized. The prepared material has excellent photothermal conversion capability and multienzyme simulation activity, and shows a photothermal-enzyme synergistic enhancement effect under the irradiation of near-infrared light. In-vitro studies show that the material can efficiently inhibit the growth of gram-negative bacteria; animal experiments further verify that the composition has a remarkable curative effect in infected wound repair. The invention not only provides a preparation method of a nano material with controllable metal doping, but also provides a novel photo-enzyme synergistic treatment method for drug-resistant bacterium infection treatment.

The present invention provides a preparation method and application of a lithium iron phosphate positive electrode material. The preparation method comprises the following steps: (1) after a first mixing of an iron source and pure water, oxidation is sequentially performed, a metal ion doping source is added for a second mixing, and a phosphorus source is added for a third mixing to obtain a pure water system mixed solution, an alcohol solution is added to the pure water system mixed solution for a fourth mixing, and then the mixture is allowed to stand, and an iron phosphate precursor is obtained after centrifugal washing; (2) after a first grinding of the iron phosphate precursor and a lithium source in step (1), a carbon source is added for a second grinding to obtain a mixed powder, the mixed powder is sequentially subjected to a first sintering to obtain a first carbon-coated lithium iron phosphate, the first carbon-coated lithium iron phosphate is subjected to a second sintering, and the lithium iron phosphate positive electrode material is obtained after screening. The preparation method of the present invention has the advantages of low cost and high preparation purity.

The invention relates to the field of lithium ion battery positive electrode materials, and particularly discloses a preparation method and application of a co-doped ferrous phosphate precursor material.The preparation method comprises the steps that an antioxidant solution and a salt solution containing doped metal ions are added into a ferrite solution, and an iron source mixed solution is obtained; mixing and reacting a phosphorus source, an iron source and an alkaline solution to obtain blue ferrous phosphate slurry; and then filtering, washing, drying and crushing to obtain the doped ferrous phosphate precursor material. According to the invention, doping and morphology regulation and control are integrated in a single reaction system through a metal ion doping process, so that the preparation process is greatly simplified, and the compaction density and the rate capability of the prepared lithium iron phosphate positive electrode material are remarkably improved.

The invention discloses an alkaline secondary battery positive electrode cobaltate-doped additive and a preparation method and application thereof, the cobaltate-doped additive is composed of metal ion-doped cobaltate represented by a general formula MxN1-xCoO2, and the cobaltate-doped additive is prepared from a recycled waste lithium cobaltate positive electrode material as a raw material, the preparation method comprises the following steps: mixing a cobalt-containing intermediate with an M-containing metal compound and an N-containing metal compound according to a stoichiometric ratio, calcining, and adding the prepared additive into an alkaline secondary battery positive electrode as a performance enhancing component. According to the invention, high-valued recycling of the waste lithium battery material is realized, the process is green and environment-friendly, and the obtained additive can significantly improve the cycle life, rate capability and structural stability of alkaline secondary batteries such as nickel-hydrogen, zinc-nickel and the like, and has significant economic benefits and environmental benefits.

The present invention relates to a low-valent metal-doped cobalt spinel catalyst, and a preparation method and application thereof. The catalyst is a cobalt spinel active carrier doped with metal ions; the doped metal ions are low-valent metals; the cobalt spinel active carrier comprises a cobalt-based oxide having a spinel structure; and the structure of the catalyst is an interconnected multi-level pore structure. The beneficial effects of the present invention are as follows: the metal ions of the low-valent metal ion-doped cobalt spinel catalyst designed by the present invention are highly dispersed and evenly distributed. The low-valent doped metal ions and cobalt ions act synergistically to jointly promote electron transfer and redox cycles; at the same time, the surface synergistic oxygen vacancy concentration and the stability of oxygen vacancies are increased, thereby promoting the catalyst's ability to catalyze the oxidation of VOCs, and having certain application value.

An acetone sensor based on metal ion-doped ceria aerogel, a preparation method, and its application in acetone detection belong to the field of gas sensor technology. The sensor comprises an Al2O3 ceramic tube substrate, two parallel and separate annular Au electrodes coated on the outer surface of the Al2O3 ceramic tube substrate, a gas-sensitive film coated on the outer surface of the Al2O3 ceramic tube and on the annular Au electrodes, and a nickel-chromium alloy heating coil passing through the interior of the Al2O3 ceramic tube. The gas-sensitive film is made of a porous metal ion-doped ceria aerogel, where the metal ions are cobalt, copper, manganese, etc. This rich porous structure helps increase the number of surface active sites on the material and enhances the diffusion rate of gas molecules and reaction products. The sensor based on metal ion-doped ceria aerogel prepared by the present invention has an ultrafast response recovery rate to acetone and has good application prospects.

The application discloses a kind of multiple modified lithium-rich cobalt-free single crystal materials, including doped lithium nickel manganese oxide base and its surface coating, the chemical general formula of doped lithium nickel manganese oxide base is Li x Ni y Mn z N 1‑y‑z O2, wherein: N is any one or several of Co, Mg element, 1 The material has excellent structural stability and electrochemical cycle stability. The preparation method of the multiple modified lithium-rich cobalt-free single crystal material is also disclosed, which physically mixes nickel manganese-based precursor, phosphate, lithium source and additive, and then sintering. Through one-step synthesis, metal ion doping and phosphate coating are simultaneously realized for multiple modification. The method is simple and easy to operate, which can significantly improve the electrochemical performance of lithium-rich cobalt-free material and has good application prospect.

The application discloses a kind of metal ion doped dimanganese trioxide, preparation method and application thereof, manganese salt and metal nitrate are dissolved in glycerol and isopropyl alcohol, the ratio of manganese salt, metal nitrate and glycerol is (0.5-2) mmol: (0.1-0.5) mmol: (4-8) mL, to obtain mixed solution;The mixed solution is kept at 160-200 DEG C, and then the precipitate in the obtained reaction liquid is separated and then washed, dried, to obtain metal ion doped manganese glycerate;Metal ion doped manganese glycerate is calcined at 700-800 DEG C in oxygen atmosphere, to obtain metal ion doped dimanganese trioxide, by metal ion doping, adjust the electronic structure of dimanganese trioxide, improve the conductivity and optimize the ion transmission characteristics, to realize higher specific capacity, longer cycle life and better charge-discharge performance.

The present invention relates to a kind of metal ion doped graphene oxide film catalyst material at room temperature and efficiently and quickly catalyzes the purposes of sulfide oxidation synthesis sulfone.By adding metal ions in the dispersion of graphene oxide, so that graphene oxide interacts with metal ions and performs the doping of metal ions, then the dispersion of graphene oxide doped with metal ions is prepared as metal ion doped graphene oxide film catalyst material by vacuum filtration method, and the content of metal ions in metal ion doped graphene oxide film catalyst material is continuously adjustable.Compared with traditional catalytic method, the present invention is in the mode of continuous mobile phase reaction, and sulfide substrate and oxidant react in the two-dimensional interlayer confined channel of metal ion doped graphene oxide film catalyst material, and product flows out with mobile phase, and the catalytic method can realize the high conversion rate (90‑100%) of sulfide oxidation reaction at room temperature, high selectivity (60‑100%), fast (1‑60s) purpose of carrying out.

The application relates to the technical field of ferroelectric thin film multi-state memory, in particular to a multi-state memory based on a quasi-two-dimensional perovskite ferroelectric thin film and a preparation method thereof. The multi-state memory comprises, from bottom to top, a substrate, a patterned conductive bottom electrode, a multi-state storage layer and a top electrode; the multi-state storage layer is a metal ion doped quasi-two-dimensional perovskite ferroelectric thin film, and under the control of an applied electric field, the multi-state storage layer shows multiple light emission intensities for representing multiple information recording states. The material of the quasi-two-dimensional perovskite in the metal ion doped quasi-two-dimensional perovskite ferroelectric thin film comprises (CHA)2CsPb2Br7, (BA)2CsPb2Br7 or (BA)2CuCl4, and the metal ion comprises but is not limited to any one of Mn, Er and Tm. The multi-state memory has the advantages of high integration level and strong controllability; under ultraviolet excitation, different voltages can be applied to show different light emission intensities, and multi-state light information storage is realized.

This invention discloses a method for preparing bimetallic site-regulated metal-organic framework adsorbents and their application in capturing low-concentration toluene. The method uses MIL-101(Cr) as the substrate material and employs a solvothermal method to introduce Al in situ during the synthesis process. 3+ By regulating Al 3+ With Cr 3+ A bimetallic coordination structure was constructed using a specific molar ratio to obtain an Al-MIL-101(Cr) dual-site modified material. This material retains its original crystal framework structure and incorporates Al-O coordination structures and polymorphic porous structures within the framework, increasing the number of Lewis acid active sites. The material prepared in this invention is suitable for the adsorption of volatile organic compounds (VOCs) in the concentration range of 0-1000 ppm, and is particularly suitable for the adsorption treatment of low concentrations of toluene. This invention achieves multi-site synergistic regulation of MOF materials through a combination of metal ion doping and structural modulation, providing a new technical approach for the design of adsorption materials for low-concentration organic pollutants.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium ion battery. By doping metal ions into lithium iron phosphate lattices, lattice parameters can be optimized, the electronic conductivity and the lithium ion diffusion rate are improved, and the rate capability of the material is improved. The carbon source forms a carbon coating layer in the sintering process, so that the conductivity of the material is further improved, and particle aggregation is inhibited. According to the prepared MOF-based interface modifier, an epoxy group and a phosphonate group are grafted on the surface of MOF through amino-olefin addition and Michael addition reactions, harmful products such as HF generated by electrolyte decomposition can be effectively adsorbed through a pore structure of the MOF, and interface side reactions are reduced; a phosphonate group and metal ions on the surface of a positive electrode form a coordinate bond, so that the interface bonding force is enhanced, and the structure collapse caused by Li deintercalation is inhibited, thereby remarkably improving the cycling stability of the material.

The application discloses a kind of anticorrosion functional composite fillers, preparation method and application, preparation method includes: respectively with fly ash, lamellar material as main filler, it is uniformly mixed with aniline, oxidizing agent, metal ion dopant, acid dopant, ethanol and water, after a certain time of reaction, functional fly ash filler and functional lamellar filler are prepared;Functional fly ash filler and functional lamellar filler are prepared under the action of chemical modifier and have long-acting anticorrosion filler with specific orientation.The application adopts the above-mentioned anticorrosion functional composite filler, preparation method and application, fly ash, lamellar material, metal oxide are compounded into functional filler with long-acting corrosion inhibition effect, and it is applied to water-based paint system, and excellent shielding performance and catalytic passivation activity are given to coating.

The invention belongs to the technical field of material synthesis and electro-catalysis, and particularly relates to a metal ion doped nickel phosphide catalyst and a preparation method and catalytic application thereof.The preparation method comprises the steps that salt containing metal ions, a nickel source, an organic ligand and a solvent are fully mixed, then a carrier is added, a hydrothermal reaction is conducted, and a metal ion doped Ni-organic ligand precursor is obtained; and then the metal ion doped Ni-organic ligand precursor is subjected to phosphating treatment, and the metal ion doped nickel phosphide is obtained. The preparation method of the material is simple, the prepared material simultaneously has alkaline hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) catalytic activity, and compared with traditional Pt and Ru-based catalysts, the use amount of Ru is reduced, the cost is reduced, and higher HER and UOR activity and stability are achieved. By coupling HER with UOR for hydrogen production, the problem of high energy consumption of full water splitting is solved thermodynamically, and the method has higher industrial application value.

The invention discloses a metal ion doped hard carbon material with a graphene coating and a preparation method and application thereof, the metal ion doped hard carbon material with the graphene coating is prepared through the steps of hard carbon precursor treatment, pre-carbonization treatment, metal salt mixing and in-situ growth, and the metal ion doped hard carbon material with the graphene coating can be used for preparing a sodium ion battery negative electrode material. The doping of different graphene coatings can be realized by selecting different types of liquid carbon sources, and the thickness of the graphene coating can be regulated and controlled by adjusting the carbonization treatment time or the gas flow rate of the liquid carbon source steam, so that the doped metal ions are effectively protected, the electrode structure is effectively stabilized, the reaction active sites are protected, and the electrochemical performance is improved. And the stability and the conductivity of the hard carbon material are remarkably improved.

The application discloses a composite material and a preparation method and quantum dot light emitting diode thereof, wherein the composite material comprises three-dimensional graphene and zinc oxide nanoparticles or metal ion doped zinc oxide nanoparticles loaded on the three-dimensional graphene. In the composite material, the zinc oxide nanoparticles or the metal ion doped zinc oxide nanoparticles are loaded in the three-dimensional graphene, so that the three-dimensional graphene can improve the conductivity of the composite material on one hand and effectively avoid the agglomeration between the zinc oxide nanoparticles or between the metal ion doped zinc oxide nanoparticles on the other hand; and the three-dimensional graphene also has good rigidity and good ductility, and can improve the film forming uniformity of the composite material.

The application discloses a kind of graphical substrate and its preparation method, LED epitaxial wafer.Preparation method includes: providing sapphire substrate;Sapphire substrate includes the substrate body and metal ion doping layer being arranged in layers, and the side surface of metal ion doping layer deviating from substrate body is sapphire substrate front;Mask layer is formed on sapphire substrate front;Using exposure developing process, mask layer is patterned to form mask pattern;Based on mask pattern, using dry etching process, sapphire substrate is etched to form multiple protruding structures on sapphire substrate front, and metal ions are doped in protruding structure.This application, metal ion doping layer can absorb light into sapphire substrate inside when exposure, avoid appearing secondary exposure phenomenon, improve mask pattern uniformity;Metal ion doped in protruding structure, can adjust the carrier concentration of epitaxial film layer, reduce the non-radiation process of extra electron in chip, improve the overall performance of chip.