265 results about "Nano copper" patented technology

The invention relates to the technical field of conductive copper paste, in particular to conductive copper paste prepared by combining liquid nonferrous metal with graphene and a preparation method of the conductive copper paste. The preparation method comprises the following steps: weighing nano-copper coated graphene composite powder, a liquid nonferrous metal, a binder, trifluoropropyltrimethoxysilane, an auxiliary agent and copper powder, and then preparing trifluoropropyltrimethoxysilane into a dilute solution; copper powder and the nano-copper coated graphene composite powder are mixed to obtain composite powder; the liquid nonferrous metal and the composite powder are stirred to obtain metal paste; and adding a resin solution and an auxiliary agent into the metal paste to form printing paste, and then standing and curing. According to the conductive copper paste, the liquid nonferrous metal serves as a main binding phase, the defect that the welding thrust is low due to a traditional resin system is overcome, the problems of dispersion and interface compatibility are solved through cooperation of the nano-copper-coated graphene and the silane coupling agent, and finally the conductive copper paste with extremely low resistance, high stability and ultrahigh welding thrust is obtained.

The invention discloses a high-transparency PVB intermediate film and a production process and application thereof, and relates to the technical field of PVB intermediate films, the high-transparency PVB intermediate film comprises the following raw materials by weight: 100 parts of PVB resin, 20-30 parts of a composite plasticizer, 0.5-0.9 part of an LDH-based composite antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.1-1.5 parts of nano lanthanum hexaboride, 0.1-1.5 parts of porous hollow nano copper sulphide, and 0.1-2 parts of nano TiO2 / SiO2 core-shell particles. The PVB intermediate film provided by the invention is relatively high in light transmittance, low in haze value, and excellent in oxidation resistance, weather resistance and mechanical strength.

The invention discloses copper paste, an electrode and a preparation method and application of the electrode, the electrode comprises copper powder, the copper powder comprises nano-copper particles and flaky copper powder, the nano-copper particles comprise at least two connected copper nanoparticles, and the adjacent copper nanoparticles are connected in a surface contact mode. According to the electrode disclosed by the invention, the nano-copper particles formed by connecting more than two copper nano-particles are filled in the gap areas among the large-size flaky copper powder, so that the nano-copper particles are in direct contact with the flaky copper powder, conductive channels among the conductive particles are smoother, and the structure of the electrode is more compact due to the filling of the nano-copper particles; the bulk resistance of the electrode is greatly reduced and is equal to the conductivity of a silver electrode; the nano-copper particles can also be used as an auxiliary adhesive after being sintered and cured, so that the adhesive force between the copper grid line and the solar cell is improved, and the connection between the grid line and the solar cell is firmer.

The invention discloses a powder coating imitation copper wire drawing coating based on a gradient composite structure and a preparation method of the powder coating imitation copper wire drawing coating, and relates to the technical field of novel printing ink. The invention relates to a gradient composite structure-based powder coating copper-wire-drawing-imitating coating, which is characterized by comprising a bottom layer, a middle layer and a surface layer, wherein the bottom layer is an epoxy resin-based powder coating layer containing nano silicon dioxide; the middle layer is a copper-imitating ink wiredrawing layer containing micro-nano copper powder in directional arrangement; the surface layer is a water-based gloss oil layer containing a self-repairing flatting agent; wherein the bottom layer is formed by electrostatic spraying. Through the gradient composite structure design of the bottom layer, the middle layer and the surface layer, the coating provided by the invention shows remarkable advantages in the aspects of hardness (4H), salt fog resistance (more than 1000 hours), self-repairing property and the like, and overcomes the limitation that the traditional coating is insufficient in adhesive force and hard to consider both hardness and wear resistance.

The invention relates to the technical field of printed electronic materials, in particular to conductive copper ink for a printed circuit and a preparation method of the conductive copper ink. The conductive mica powder-graphene composite material comprises conductive mica powder, a nano-copper-graphene filler, flaky copper powder, spherical copper powder, an organic carrier, a dispersing agent, a coupling agent, an antioxidant and an auxiliary agent, a layer-point composite conductive structure is constructed through conductive mica powder and nano-copper-graphene filler, a close packing system is formed by combining particle size grading of copper powder with different morphologies, and the conductivity is guaranteed; by means of a chemical bonding interface formed by the coupling agent, the copper powder and the organic carrier, the integrity of the coating is enhanced, and stress cracking during welding is reduced; microencapsulated rosin in the auxiliary agent promotes wetting and spreading of the welding flux, titanate modified nano titanium dioxide constructs a three-dimensional cross-linked network to improve the bending resistance and thermal shock resistance of the coating, the falling phenomenon of components after welding is reduced, and the stability of the conductive copper ink in actual printed circuit production is improved.

The invention discloses a copper-clad plate material containing elastomer resin and a preparation method of the copper-clad plate material, and belongs to the technical field of new materials. The method comprises the following steps: mixing a styrene-butadiene-styrene block copolymer with polybutadiene rubber, adding nano-montmorillonite, and carrying out intercalation modification through hexadecyl trimethyl ammonium bromide to prepare nano-modified elastomer resin; the preparation method comprises the following steps: mixing polybutylene terephthalate with nano silicon dioxide, and carrying out surface modification by gamma-aminopropyltriethoxysilane and hexamethyldisilazane to obtain a resin matrix; mixing the two phases, adding citric acid, and carrying out microwave heating and high-shear dispersion to obtain a discrete material; carrying out hot pressing on the dispersion, adding polyurethane and polylactic acid, uniformly mixing, adding polydimethylsiloxane and sodium dodecyl benzene sulfonate, and curing to obtain a cured product; and coating the surface of the cured product with a nano-copper layer. The material has the characteristics of high peel strength, low dielectric loss, low water absorption and low thermal expansion, and is suitable for the field of high-speed low-loss copper-clad plates.

The present invention belongs to the technical field of petrochemical catalysis, and relates to a preparation method for improving the stability of a Cu-Beta zeolite catalyst for preparing caprolactam from caprolactone, and the use thereof. In the present invention, a cavity-modified dealuminated Beta zeolite is used as a carrier, and copper is loaded in pore channels of the zeolite carrier by means of an improved ammonia distillation method. The cavity modification refers to subjecting the dealuminated Beta zeolite carrier to a desiliconization technique controlled by the use of a weak organic base so as to enlarge silanol nests generated by dealumination of the dealuminated Beta zeolite carrier, thereby better accommodating and stabilizing the nano and sub-nano copper particles. The core of the improved ammonia distillation method involves impregnating a zeolite carrier with an equal volume of a copper-ammonia complex solution, such that the copper-ammonia complex mainly undergoes, during ammonia distillation, a reaction of depositing copper hydroxide in zeolite pore channels, thereby improving the sintering resistance. The Cu-Beta catalyst prepared using the method provided by the present invention exhibits high activity, selectivity and stability when applied to the reaction of caprolactam prepared from caprolactone via gas-solid phase hydroamination.

The invention belongs to the technical field of electronic materials, and particularly relates to a preparation method of a copper powder enhanced terahertz composite wave-absorbing film. The preparation method comprises the following steps: by taking polyurethane modified epoxy resin as a raw material, sequentially adding silane coupling agent modified aluminum oxide, chitin coated silicon dioxide and substituted thiophenol self-assembled nano-copper powder, stirring, then adding a curing agent and a dispersing agent to obtain a mixed solution, then pouring the mixed solution into a coating machine, and coating to obtain the coating. Preparing a copper powder enhanced terahertz composite wave-absorbing film; the minimum wave-absorbing efficiency of the thin film in the frequency band of 0.3-3.0 THz is-26.7 dB, and the effective bandwidth with the wave-absorbing efficiency smaller than-10 dB is the full frequency band; the composite wave-absorbing material can be used for wave-absorbing electromagnetic protection of 6G electronic devices.

The invention relates to the technical field of solar cells, and particularly discloses conductive paste for a solar cell, a preparation method of the conductive paste and an electrode. The conductive paste for the solar cell comprises the following components in percentage by weight: 88%-92% of carbon-based nano-copper particles, 4%-6% of glass powder and 4%-6% of an organic additive, the carbon-based nano-copper particles are prepared by reacting copper chloride with glucose and then calcining, the particle size is 52-100nm, and copper oxidation is inhibited by using a carbon layer; the organic additive is composed of a stabilizer, resin and an organic solvent according to a ratio of 1: 3: 9. The conductive material is prepared by mixing, dispersing, grinding and filtering, and can be prepared into a solar cell conductive material by silk-screen printing and high-temperature sintering. The conductive paste is low in cost, high in oxidation resistance and excellent in conductivity, and can replace silver paste to reduce the manufacturing cost of the solar cell, improve the performance and prolong the service life.

The present disclosure provides a high-temperature resistant nano-copper produced by laser direct writing, a preparation method and an application thereof. The high-temperature resistant nano-copper exhibits excellent oxidation resistance, thermal stability and superior conductivity. In this disclosure, the preparation is simple, and the nano-copper oxide ink can be stored for extended periods without being affected by oxidation. It is suitable for various manufacturing processes including printing, coating, and other similar methods. Moreover, based on laser direct writing, the processing efficiency is high, enabling the one-step integration of multi-performance of the high-temperature resistant nano-copper. The high-temperature resistant nano-copper described in the present disclosure can be used as an interconnection circuit in an integrated sensor system based on all-laser in-situ direct writing, and can be widely applied in fields of aerospace, automobile, electronics, etc.

The invention provides nanoscale superfine copper powder and a preparation method thereof, and belongs to the technical field of metal powder, the preparation method comprises the following steps: dispersing copper salt and a complexing agent in deionized water to obtain a copper salt solution; dispersing a reducing agent and a dispersing agent in deionized water to obtain a reducing solution; dispersing sodium hydroxide in deionized water to obtain a sodium hydroxide solution; the method comprises the following steps: heating a copper salt solution, a reduction solution and a sodium hydroxide solution to 45-80 DEG C, adding the reduction solution into the copper salt solution under a stirring condition, then adding the sodium hydroxide solution to obtain a mixed solution, and reacting for 2-3 hours; and after the reaction is finished, a suspension containing copper powder is obtained, and after solid-liquid separation, washing and drying are conducted, the nanoscale superfine copper powder is obtained. The method is simple in technological process, does not need special equipment and is suitable for industrial production. And the prepared nano copper powder is good in dispersing performance, uniform in particle size distribution, high in purity and suitable for being applied to the field of microelectronic components.

The invention discloses a marine antifouling and anticorrosive coating with copper ion controllable release and self-repairing functions and a preparation method of the marine antifouling and anticorrosive coating, and belongs to the technical field of marine equipment antifouling and anticorrosive coatings. In order to solve the problems that a traditional copper-based antifouling coating is too fast in initial release of copper ions, poor in antifouling persistence, easy to damage and difficult to give consideration to antifouling and self-repairing performance, the preparation method comprises the following steps: firstly, preparing a KH560 modified nano copper oxide / activated carbon antifouling agent; controllable release of copper ions is achieved through the adsorption effect of activated carbon and interface modification of KH560. Secondly, taking PTMG and TDI as raw materials, and introducing FDME and BMI to construct a self-repairing polyurethane matrix containing reversible covalent bonds and hydrogen bonds; finally, the antifouling agent is introduced into the self-repairing polyurethane matrix according to a specific proportion, and the composite coating is prepared. According to the invention, long-acting controllable release of copper ions and synergistic improvement of self-repairing and corrosion resistance of the coating are realized, and the coating is suitable for long-term protection of marine equipment.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention provides a catalytic viscosity reduction system for improving interfacial tension of super-heavy oil and a preparation method of the catalytic viscosity reduction system. The viscosity reduction system comprises the following components in parts by weight: 0.5-1 part of a poly-surfactant, 0.5-2 parts of a nano-copper catalytic system, 0.5-1 part of fatty alcohol-polyoxyethylene ether, 0.2-0.4 part of polyethylene glycol, 0.1-0.5 part of a modified nano-surfactant and 100 parts of water. On one hand, emulsification viscosity reduction is achieved through the synergistic effect of the poly-surfactant and the fatty alcohol-polyoxyethylene ether, and on the other hand, metal catalytic cracking viscosity reduction is conducted through the nano-copper catalytic system, so that the viscosity of the thickened oil is greatly reduced, the thickened oil has the high viscosity reduction rate at the low temperature and the high temperature, and the viscosity reduction rate is 96% or above according to indoor evaluation. The interfacial tension is reduced by compounding the nonionic surfactant fatty alcohol-polyoxyethylene ether and ethylene glycol, and the oil-water interfacial tension can be reduced to 10 <-2 > mN / m or below through the synergistic effect of the surfactant and the modified nano-surfactant, so that oil-in-water emulsion is favorably formed, the viscosity reduction effect is improved, and the fluidity of crude oil is improved.

The invention relates to an additive for improving refrigeration efficiency of liquid water and a production process thereof, and belongs to the technical field of water additives. The additive comprises 70-80 parts by weight of a carrier, 3-6 parts by weight of modified sophorolipid, 1-2 parts by weight of sodium polyacrylate and 0.5-1.5 parts by weight of sodium molybdate, the carrier is of a core-shell structure, the core of the carrier is nano-copper, and the shell of the carrier is hydrophilic mesoporous silica doped with carboxylated carbon nanotubes; according to the additive prepared by the invention, the refrigeration efficiency of water is improved through the interaction among the carrier, the surfactant and liquid water.

The invention discloses a nano-copper-zinc bimetal organic framework, a nano-drug material, a preparation method and application. The structural formula of the nano-copper-zinc bimetal organic framework is shown in the specification. According to the nano copper-zinc bimetal organic framework disclosed by the invention, through the synergistic effect of two metal ions, the structural stability and biocompatibility of a material can be optimized, and the material is endowed with multiple biological functions; the method is suitable for preparing nano-drug materials.

The invention discloses an antistatic teflon sleeve and a preparation method thereof. The antistatic teflon sleeve is prepared from the following components in parts by weight: 80-95 parts of teflon resin, 5-20 parts of a core-shell structure conductive filler, 1-3 parts of a compatilizer, 0.5-2 parts of a flexibilizer and 0.1-0.5 part of an antioxidant. The outer protective layer is prepared from the following components in parts by weight: 70 to 85 parts of ethylene-tetrafluoroethylene copolymer, 5 to 15 parts of modified nano silicon dioxide, 5 to 10 parts of fluororubber, 1 to 3 parts of antistatic aid and 0.1 to 0.5 part of ultraviolet absorbent. Through the design of the core-shell structure conductive filler, the core layer nano copper powder provides high conductivity, the shell layer PVDF has good compatibility with the Teflon base material, the surface modification layer further enhances the interface bonding force, the volume resistivity of the inner layer base material is reduced, and the antistatic requirement is met; the conductive filler is uniformly dispersed in the base material instead of a surface coating, so that the antistatic performance failure caused by friction or bending is avoided, and the antistatic performance is lasting and stable.

The application belongs to the technical field of friction materials, and relates to a powder metallurgy friction material and a preparation method thereof. Raw materials for preparing the powder metallurgy friction material include 10wt%-15wt% silicon carbide nanoparticles, 5wt%-15wt% aluminum oxide nanoparticles, 5wt%-10wt% molybdenum disulfide, 5wt%-10wt% hexagonal boron nitride, 5wt%-10wt% microencapsulated self-repairing agent, and the rest nano-copper powder. The application improves the wear resistance and mechanical properties of the powder metallurgy friction material through the synergistic use of the silicon carbide nanoparticles, nano-copper powder and microencapsulated self-repairing agent, and the preparation method is simple and suitable for large-scale industrial production.

The invention discloses a preparation method of a functional current collector. The preparation method comprises the following steps: step 1, heating and reacting raw materials containing a polyamide raw material, a copper source compound, a catalyst and a reducing agent in an inert atmosphere at 180-220 DEG C for 1-3.5 hours; heating and reacting for 1 to 2 hours under the condition of 230 to 265 DEG C; after the reaction is finished, vacuumizing to-0.07 to-0.08 MP to form a polyamide nano-copper composite material; 2, stirring the polyamide nano-copper composite material to prepare a thin film, so as to obtain a conductive base film; 3, grinding the surface of the conductive base film in an inert atmosphere, and removing dust; and 4, carrying out electroplating treatment on the ground conductive base film, and covering the surface of the conductive base film with a metal coating to obtain the functional current collector. According to the invention, polyamide and metal particles are compounded, water electroplating is directly carried out, and a magnetron sputtering process is not needed. And compared with the traditional magnetron sputtering and water-adding electroplating process for manufacturing the functional current collector, the process yield is improved.

The invention discloses composite lithium-based lubricating grease containing nano-copper and a preparation method of the composite lithium-based lubricating grease. The invention relates to a preparation method of composite lithium-based lubricating grease containing nano-copper. The preparation method comprises the following steps: adding nano-copper particles into lithium-based base grease according to a certain ratio to obtain a mixture; the addition amount of the nano-copper particles is 0.5 wt%-2wt% of the composite lithium-based lubricating grease containing the nano-copper; carrying out primary mixing on the mixture; and then grinding the mixture to obtain the composite lithium-based lubricating grease containing the nano-copper. The nano-copper particles are added into the lithium-based base grease, and the nano-copper particles form a conductive network in the lubricating grease, so that the resistivity of the lubricating grease is effectively reduced, current can be conducted away through a plurality of channels, the situation that the current centrally breaks down an oil film is avoided, and electric corrosion is inhibited from the source.

The invention relates to a preparation method of a copper monatomic bactericidal material. According to the invention, a solid oxide or a carbon material is used as a carrier, and the carrier, nano-copper and a phenolic compound aqueous solution are mixed and stirred in a dark place at an ambient temperature. A phenolic compound, especially an ortho-phenolic hydroxyl group of catechol, is preferentially combined with nano-copper, destroys metallic bonds on the surface of the nano-copper, mediates the nano-copper to dissociate layer by layer, stabilizes the nano-copper into a monatomic state and finally uniformly anchors the nano-copper on the surface of a carrier to form a stable copper monatomic material, the method is carried out under environmental conditions, the preparation steps are simple, the synthesis time is short, and the method is suitable for industrial production. And large equipment is not needed. The sterilization efficiency of the obtained copper monatomic material on escherichia coli is improved by 15 times compared with that of nano-copper, but the dissolution rate of copper ions is reduced by 87%. The material is suitable for long-acting antibiosis of medical instruments, water treatment systems and food packaging surfaces.

The invention discloses a preparation method of a nano copper selenide antibacterial peptide-loaded multistage microporous titanium alloy. The preparation method comprises the following steps: 1, preparing a substrate; 2, surface modification; and 3, carrying out functionalization treatment to obtain the multistage microporous titanium alloy loaded with the nano copper selenide antibacterial peptide. The invention further provides the multistage microporous titanium alloy loaded with the nano copper selenide antibacterial peptide. The load design and photo-thermal synergistic mechanism of the nano copper selenide antibacterial peptide-loaded multistage microporous titanium alloy can effectively inhibit bacterial breeding and greatly reduce the infection risk of implantation operations, and on the aspect of promoting osseointegration, the multi-scale structure and ion slow release design can accelerate bone tissue growth and material fusion and reduce long-term complications, so that the titanium alloy can be used as a medical material for treating osteoporosis. The bone repair microenvironment is optimized, a new thought, good stability and safety are developed for complex disease treatment, long-term stable effect in vivo is guaranteed, strict standards are met, a solid foundation is laid for large-scale clinical application, and the bone implantation medical field is expected to be innovated.

The invention relates to a battery cell manufacturing and welding process, in particular to a process for completing battery cell welding at low temperature, which comprises the following steps: (S1) pretreatment: removing impurities on a welding surface; (S2) preparing nano-copper brazing slurry; (S3) coating the nano-copper brazing slurry, namely coating the nano-copper brazing slurry on a welding area; (S4) welding is conducted, specifically, the welding areas of the welding workpiece are aligned, the areas coated with the nanometer copper brazing slurry are heated, and inert gas is introduced for protection in the heating process; (S5) cooling treatment is conducted, specifically, after welding is completed, a welding area is rapidly cooled; and (S6) welding detection is carried out to determine whether welding requirements are met. The battery cell manufacturing and welding process disclosed by the invention can realize low-temperature welding.

The application discloses a kind of perfluoropolyether nanocomposite grease and preparation method thereof, belong to the technical field of lubricating material.The lubricating grease includes perfluoropolyether base oil, polytetrafluoroethylene thickener and composite nano additive, wherein the composite nano additive is composed of surfactant modified antiwear additive, structure stabilizer, rust and oxidation inhibitor.Antiwear additive is one of nano copper, nano cerium oxide, nano titanium oxide and molybdenum sulfide, structure stabilizer is one of nano silicon oxide and porous alumina, and rust and oxidation inhibitor is nano zinc oxide.The composite nano additive is introduced in the form of perfluoropolyether oil phase dispersion, and is homogenized with thickener under the condition of 150~260℃ after dispersion and mixing.The application realizes the synchronous improvement of lubricating grease wear resistance, colloid stability, rust and oxidation resistance and oxidation stability through the synergistic effect of various nanomaterials, and is suitable for harsh working condition environment such as high temperature, high load, high vacuum and strong corrosion.

The application discloses a preparation method of nano copper powder and belongs to the technical field of nano copper powder preparation. The method comprises the following steps: S1, preparing a mercaptopropionic acid-ethanol solution; S2, preparing surface carboxylated quantum dots; S3, preparing an enzyme solution; S4, preparing an enzyme solution in which surface carboxyl groups are converted into active esters; S5, preparing a surface carboxylated quantum dot solution; S6, preparing a quantum dot-biomolecule mixture; S7, preparing a copper salt solution and adjusting the pH to 5-6; and S8, preparing nano copper powder. In the method, copper ions in the copper salt solution are reduced into copper atoms by the quantum dot-biomolecule mixture to prepare the nano copper powder. The prepared nano copper powder can accurately control the nucleation rate and quantity of the nano copper powder, and has low preparation cost and high preparation efficiency.

This invention belongs to the field of oil and gas well exploration and development technology, specifically relating to a high-temperature sealing thread grease for oil casing and its preparation method and application. The thread grease comprises the following components in parts by weight: 33-58 parts base grease, 10-40 parts magnetic fluid, 1-5 parts polyethylene glycol, 5-10 parts phosphate ester, 4-10 parts fumed silica, 3-18 parts graphite, 1-5 parts nano-molybdenum powder, 1-5 parts nano-copper powder, 6-12 parts zinc powder, 10-30 parts lead powder, 5-10 parts alkylphenol resin, 5-15 parts acrylic resin, 5-15 parts polytetrafluoroethylene, 10-18 parts diisocyanate, 10-18 parts polyurethane, 10-12 parts tetraethylene glycol dimethacrylate, and 6-11 parts nitrile rubber. This invention ensures good lubricity while maintaining excellent sealing performance under high-temperature conditions.

The invention discloses a preparation method of tungsten-coated tungsten / copper powder for tungsten-copper slurry, which comprises the following steps: ensuring that copper is uniformly distributed on the surface of tungsten powder by utilizing the charge adsorption effect of nano copper oxide and the tungsten powder, then reducing the nano copper oxide under a hydrogen condition, and improving the binding force of copper and tungsten by utilizing the energy change of a reduction reaction. Then a functional phase material of a tungsten-tungsten / copper structure is prepared through PVD tungsten layer plating, the binding force of tungsten copper and a tungsten layer is improved through heat treatment, segregation of a copper phase in the high-temperature co-firing process is prevented through the tungsten layer with the compact surface, meanwhile, the layering and cracking phenomena of the material after slurry high-temperature sintering can be reduced through configuration of tungsten powder with different granularities, and the material density is improved; and the square resistance is effectively reduced.

The invention provides a preparation method of rod-like copper powder, and belongs to the field of micro-nano copper powder preparation. The preparation method comprises the steps that a copper salt solution, a dispersing agent and halide ions are mixed to obtain a precursor solution, and the pH value of a reaction system is any one of 8-12; a reducing agent is added into the precursor solution at a preset rate, a reduced copper powder solution is obtained, the pH value of a reaction system is any value in the range of 8-12, and the preset rate is any value in the range of 0.1 mL / min to 3 mL / min; and the reduced copper powder solution is subjected to aftertreatment, and the rod-shaped copper powder is obtained. According to the preparation method, crystals are effectively induced to grow along the specific orientation, the reduction and growth rate is accurately regulated and controlled, and the prepared rod-like copper powder is uniform in morphology, narrow in particle size distribution, good in dispersity and high in purity.

The application discloses a kind of step-by-step doping preparation ultra-thin BME ceramic dielectric capacitor and preparation method, and the ultra-thin BME ceramic dielectric capacitor is by dielectric layer and dielectric layer mutual superposition and is fired, the dielectric layer includes dielectric layer and electrode printed on dielectric layer, the dielectric layer includes the following raw materials: coated BSCT main matrix, liquid flux agent;Coated BSCT main matrix includes the following raw materials: BSCT material, magnesium nitrate, manganese acetate, oxovanadium oxalate, rare earth nitrate;Liquid flux agent is by nano copper oxide, tetraethyl orthosilicate, tributyl borate in proportion, targeted doping is carried out by step-by-step doping, and new three-layer structure is formed to obtain good comprehensive performance.

The invention provides an integrated copper electrode for hydrogen production through electro-catalysis of formaldehyde and a preparation method and application of the integrated copper electrode. The copper electrode comprises a current collector and an active structure attached to the current collector. The current collector is conductive polyurethane of which the surface is plated with a copper metal layer; the active structure is composed of a copper cone grown on the copper metal layer in situ, and the diameter of the bottom of the copper cone is 0.1-2.5 [mu] m; the height is 0.5-5 [mu] m; the height / bottom diameter ratio is 4.5-8; the thickness of the copper metal layer is 0.5-5 [mu] m; according to the copper electrode, a copper metal layer with a specific thickness is electroplated on conductive polyurethane to serve as a current collector; the copper electrode current collector and the active structure are integrally formed by taking the copper metal layer as a substrate and taking the nano-copper cone growing on the copper metal layer in situ as the active structure, so that the copper electrode current collector and the active structure have high mechanical stability, and the catalytic activity and stability of the copper electrode for electro-catalysis of formaldehyde to produce hydrogen are improved; the preparation method of the copper electrode is simple and can be widely applied to hydrogen production through electrocatalysis of formaldehyde.