775 results about "Silver particles" patented technology

The invention discloses a multifunctional interlayer modified silicon-based nanowire photoelectric cathode, which comprises a p-Si substrate layer, a nanowire morphology layer, a CdS layer and a MoS2 cocatalyst layer, the preparation method comprises the following steps: (1) cleaning the p-Si substrate, and blow-drying the p-Si substrate for later use; (2) depositing in a first deposition solution to prepare a p-Si substrate with silver particles adsorbed on the surface; (3) etching in an etching solution, and forming a nanowire structure on the p-Si substrate; (4) placing the nanowire structure in a second deposition solution for deposition, and forming a CdS layer on the nanowire structure; and (5) taking the p-Si substrate treated in the step (4) as a working electrode, and depositing in an electro-deposition solution to prepare the silicon-based nanowire photoelectric cathode. The CdS layer and the MoS2 co-catalyst layer in the photoelectric cathode reduce the lattice mismatch problem caused by direct loading of the CdS layer and the MoS2 co-catalyst layer, and meanwhile, the CdS layer and the MoS2 co-catalyst layer and the silicon substrate form a heterogeneous pn junction structure, and the photoelectrochemical performance is remarkably improved through a multi-layer synergistic effect.

The invention provides a natural graphite composite negative electrode material and a preparation method thereof, and a lithium ion battery, the natural graphite composite negative electrode material comprises natural graphite, a fluffy net-shaped three-dimensional carbon network coated outside the natural graphite, and an amorphous carbon coating layer arranged outside the fluffy net-shaped three-dimensional carbon network; wherein magnesium ions and / or aluminum ions are dispersed in the fluffy three-dimensional carbon network, and copper particles and / or silver particles are doped in the amorphous carbon coating layer. The natural graphite composite negative electrode material provided by the invention has a three-dimensional conductive network, is doped with metal, and has good conductivity and excellent electrochemical cycle performance.

The invention relates to the field of optical lens coatings, and particularly discloses a preparation method of an antifouling and antibacterial spectacle lens coating. The preparation method of the antifouling and antibacterial spectacle lens coating comprises the following steps: depositing a silicon dioxide substrate on the surface of a lens through plasma enhanced chemical vapor deposition treatment; the preparation method comprises the following steps: dispersing nano-graphene and nano-silver particles in an ethanol solvent, adding a silane coupling agent to form a homogeneous suspension, loading the suspension on the surface of a silicon dioxide substrate through a spin-coating method, and carrying out heat treatment curing to form an antibacterial layer, with the loading amount of nano-silver being less than or equal to 0.5 wt%; and etching the surface of the antibacterial layer by adopting a reactive ion etching method, and then grafting perfluorooctyltriethoxysilane on the etched surface at 80-100 DEG C by adopting a vapor deposition method to form the hydrophobic layer. The preparation method of the antifouling and antibacterial spectacle lens coating has the advantages of being antibacterial, antifouling and high in durability.

The invention discloses a complex sample detection method based on surface enhanced Raman spectroscopy and application, and relates to the field of biomolecular detection.The method comprises the following steps that silver nanoparticles are prepared and serve as a surface enhanced Raman substrate; preparing a concentrated silver particle solution by using the silver nanoparticles; detecting surface enhanced Raman spectrum signals of the complex sample under excitation of different wavelengths; removing a background signal and noise from the obtained surface enhanced Raman spectrum signal; and averaging the surface enhanced Raman spectra obtained by processing each wavelength, and carrying out maximum and minimum normalization processing on the obtained average spectrum intensity. According to the method, richer and more comprehensive chemical information and component information of the complex samples can be obtained, more accurate recognition and classification of the complex samples can be achieved, the recognition accuracy is greatly improved, the method is convenient and rapid to operate, low in cost and high in generalization ability and practicability, and large-scale commercial application can be achieved.

The invention discloses silver powder with high tap density and a preparation method and application thereof, and the preparation method of the silver powder comprises the following steps: dispersing silver salt in an alcohol amine solution, and then reacting with an organic amine solution to prepare silver particles. According to the preparation method of the silver particles, spherical powder with different particle sizes can be prepared, silver paste prepared from the spherical silver powder generally has better fluidity, the silver particles with large particle sizes and the silver particles with small particle sizes are filled with one another, the sufficient contact area between the silver powder is ensured, and the requirement of the front silver paste for the performance of the silver powder can be met.

A method including detecting contaminants in a water sample using a machine learning algorithm having a Laplacian operator configured to extract Raman peak data, a deep neural network, and a K nearest neighbors (KNN) cluster model. The method may include a test system having a silicon nanofiber film, a plurality of ZnO nanorods arranged in an array on the silicon nanofiber film, and a plurality of silver particles disposed on the plurality of ZnO nanorods. A water sample may be applied onto the test system, and the water sample may be measured using surface-enhanced Raman spectroscopy to generate the Raman peak data used in the machine learning algorithm.

Composite materials with noble metal coated silver nanowires loaded into polymer are described. The composite materials may have resistivities of no more than about 100 Ohm-cm, or from about 100 Ohm-cm to about 1×1011 Ohm-cm depending on the amount of noble metal coated silver nanowires loaded into the polymer. The noble metal coated silver nanowires may be platinum coated silver nanowires. Metal particulates such as silver flakes or silver particles may be added to the composite materials in order to obtain desired properties. Composite precursor compositions and methods for preparing the composite materials are described.

The invention provides high-filling silver powder and a preparation method thereof, and belongs to the field of metal powder.The preparation method comprises the steps that a nano-silver solution is prepared, a dispersing agent and a first reducing agent are mixed to obtain a mixed solution, the nano-silver solution and the mixed solution are mixed in a constant-temperature stirring state to obtain a base solution, a second reducing agent solution and a silver nitrate solution are prepared respectively, and the high-filling silver powder is prepared. And under the constant-temperature stirring state, the second reducing agent solution and the silver nitrate solution are synchronously added into the base solution, a silver powder solution is obtained through reaction, the silver powder solution is subjected to washing, solid-liquid separation, drying and depolymerization shaping treatment, and the high-filling silver powder is obtained. Controllable preparation of the large-size sphericity silver powder is achieved by controlling the particle size and the adding amount of the nano-silver, regulating and controlling heterogeneous nucleation and growth sites of silver ions and inhibiting formation of multistage dendritic crystals, surface charges and steric hindrance effects of silver particles are optimized through the surface adsorption effect of the dispersing agent, the agglomeration phenomenon of the silver powder in the growth process is reduced, and the silver powder is prepared. And meanwhile, the silver powder is endowed with excellent flowability.

The invention discloses a power-on viscosity-reducing adhesive tape and a preparation method and application thereof, and belongs to the technical field of processing of UV adhesive tapes for batteries, the preparation method comprises the following steps: mixing and stirring an acrylate pressure-sensitive adhesive, a UV prepolymer, composite conductive hydrogel, a curing agent, a photoinitiator, a solvent and a leveling agent to obtain conductive glue; and coating the conductive glue on the upper and lower surfaces of the aluminum foil substrate, drying at 80-100 DEG C for 5-6 minutes to obtain a conductive adhesive layer, and adhering release films on the upper and lower surfaces of the conductive adhesive layer to obtain the electrified viscosity-reducing adhesive tape. The synthesized porous carbon has high porosity, and promotes the manganese-doped nano zinc sulfide to emit light to initiate polymerization, crosslinking and curing of the conductive adhesive layer, so that the conductive adhesive layer loses viscosity; nano-silver particles are formed on the surface of the zinc oxide whisker loaded with the porous carbon, so that the pore structure of the porous carbon is refined, and the heat dissipation performance of the electrified viscosity-reducing adhesive tape is improved.

The invention provides application of a silver-bismuth tungstate catalyst in preparation of methanol from light-driven CO2, and belongs to the technical field of CO2 conversion and reduction. Bismuth tungstate nanosheets, silver salt and water are mixed, the size of silver particles is controlled by adjusting the pH value, the silver-bismuth tungstate catalyst is obtained, and the size of the silver particles is 20-50 nm; silver is evenly distributed on the surface of bismuth tungstate, the obtained silver-bismuth tungstate catalyst is large in specific surface area and high in light response capacity, the silver-bismuth tungstate catalyst can generate a large number of high-energy hot electrons during illumination, in-situ photo-thermal conversion is achieved, no external heat source is needed for heat supply, the photo-thermal effect is enhanced, CO2 conversion is promoted, and the methanol yield is increased.

The invention relates to the technical field of composite materials, in particular to a high-conductivity thermosetting resin-based composite material and a preparation method thereof.The high-conductivity thermosetting resin-based composite material is prepared from, by weight, 50-80 parts of epoxy resin, 10-30 parts of conductive carbon nanotubes, 20-40 parts of nano-silver particles, 10-20 parts of functionalized polyurethane prepolymer, 5-15 parts of polyamine curing agent and 2-8 parts of organosilane coupling agent. 5-15 parts of graphene nanosheets, 5-15 parts of aluminum borate whiskers and 5-15 parts of barium titanate nanoparticles; 2-10 parts of conductive polymer microspheres; 1 to 5 parts of nano zinc oxide; wherein the conductive polymer microsphere comprises a core formed by polyaniline or polypyrrole, and a polyurethane polymer or a polyacrylate polymer wrapping the outer layer of the core; the surface of the core is modified by adopting nano silver particles and gamma-aminopropyltriethoxysilane; the conductive polymer microspheres are used for providing a long-range conductive path, the nano-silver particles are used for providing short-range conductive connection, and the conductive polymer microspheres and the nano-silver particles form a multi-layer conductive network.

The invention relates to the field of solder materials, and provides a non-ferrous metal solder for low-temperature brazing and application, the solder is composed of carbon-coated copper nanorods, tin-bismuth alloy-coated silver nanoparticles, 2-mercaptobenzimidazole, rosin resin, an organic active agent, a dispersing agent, ionic liquid, hydroxyethyl cellulose, indium nitrate and citric acid. The silver particles are of a core-shell structure and are coated with tin-bismuth alloy layers, and continuous carbon layers are formed on the surfaces of the copper nanorods, so that the conductivity and the interface stability of the solder are effectively improved. The non-ferrous metal solder with excellent conductivity, low melting point and good wettability is prepared through step-by-step mixing, hot press molding and low-temperature heat treatment processes, and is suitable for electronic device packaging, power device connection and flexible circuit interconnection, and the defects of existing solder in the aspects of low-temperature welding and high conductivity are overcome.

The invention discloses porous cyclodextrin microspheres loaded with nano-silver as well as a preparation method and application of the porous cyclodextrin microspheres. The porous cyclodextrin microspheres are obtained by loading nano-silver on oligomeric cyclodextrin with the molecular weight of 8000-14000, then blending the oligomeric cyclodextrin with poly (methyl vinyl ether-alt-maleic acid) to obtain microspheres and then cross-linking the microspheres. The porous cyclodextrin microspheres are selected as the carrier of AgNP, and cyclodextrin has a hydrophobic cavity, so that specific hydrophobic molecules and pollutants can be included in the cavity, and contact and catalysis processes of reactants and silver particles are promoted synergistically. Moreover, the cyclodextrin microspheres have micron-scale and even millimeter-scale porous structures, the abundant porous structures can ensure that reactants quickly enter the microspheres to be in full contact with silver, the catalytic reaction is efficiently carried out, and meanwhile, the larger size of the microspheres ensures that fluid can pass through the microspheres at a high speed in a fixed bed reactor, so that the catalytic efficiency is improved. And the contradiction between the catalyst efficiency and the large particle size in practical application is solved.

The invention discloses an antibacterial air purification filter element and a preparation method thereof, and relates to the technical field of filter materials. The antibacterial air purification filter element is prepared from the following raw materials in parts by weight: 30 to 50 parts of activated carbon, 10 to 15 parts of silver chloride nanoparticle / quaternary ammonium salt polymer composite antibacterial agent, 3 to 5 parts of calcium hydroxide, 8 to 10 parts of simethicone, 3 to 5 parts of sodium alginate and 20 to 30 parts of bentonite. A diblock copolymer of a quaternary ammonium salt compound and an aromatic nitrogen atom-containing functional monomer is prepared through free radical copolymerization, then silver chloride particles are generated in a polymer matrix through in-situ precipitation, and the silver chloride nanoparticle / quaternary ammonium salt polymer composite antibacterial agent is prepared. The antibacterial air purification filter element prepared by the invention has the characteristics of strong antibacterial ability, long antibacterial time, corrosion resistance and the like.

The invention discloses composite silver powder with a surface nano-coating structure and a preparation method of the composite silver powder. The composite silver powder comprises a micron-sized spherical silver powder core and a nano-silver shell layer coating the surface of the core, and the nano-silver shell layer comprises nano-silver particles making contact with one another; the D50 particle size of the core body is 1-2 microns, and the particle size D50 of the nano-silver particles is 10-100 nm; the composite spherical silver powder with micron-sized silver coated with nano-silver is prepared through a liquid phase chemical reduction method, the D50 particle size of the composite spherical silver powder is 1.67-1.70 microns, the tap density can reach 5.94 g / cm < 3 >, the specific surface area can reach 0.47 m < 2 > / g, and compared with micron-sized spherical silver powder of a single structure, the conductive performance of the silver powder can be improved by 32%, and the sintering activity is higher.

The invention provides a preparation method of a catalyst for synthesizing indole, which comprises the following steps: sequentially impregnating silicon dioxide in a manganese salt solution, a first alkali solution, a silver nitrate solution containing an auxiliary agent M and a second alkali solution by adopting an impregnation method, standing for 0-72 hours at the temperature of 0-50 DEG C during each impregnation, and drying for 0-72 hours at the drying temperature of 20-290 DEG C after each standing, the auxiliary agent M is any one or more of aluminum nitrate, zirconium nitrate, lanthanum nitrate and cerium nitrate. Manganese dioxide is used as an anchor point, so that silver oxide is effectively dispersed and anchored on the surface of a silicon dioxide carrier modified with manganese dioxide; and finally, a nitrate auxiliary agent with the atomic radius larger than that of silver atoms is added and used for inhibiting the rate of increasing the particle size of the silver particles due to agglomeration of the silver particles caused by high-temperature sintering. The preparation process does not involve treatment at 300 DEG C or above and roasting treatment, and the preparation method is simple in step.

The invention discloses conductive silver paste for a co-fired ceramic inner electrode and a preparation method of the conductive silver paste. The conductive silver paste comprises the following components in percentage by mass: 80%-90% of silver particles, 0%-10% of an inorganic additive, 5%-20% of a carrier, 0.6%-0.9% of an inorganic additive, 0.3%-1% of an auxiliary agent, 0.2%-0.4% of an organic additive and 0.8%-5% of an organic solvent. The preparation method comprises the following steps: mixing raw materials, dispersing, adjusting and filtering. Conductive silver particles are prepared through a chemical synthesis method, and the silver powder particles are further stirred and sheared to be refined, so that the purity of the silver particles is higher, and the conductivity is improved; meanwhile, the dispersity and the stability of the conductive particles are improved by adding auxiliaries, and the fluidity and the viscosity of the slurry are adjusted by utilizing an organic solvent, so that the slurry can cover the surface of a ceramic body in a better fit manner, the situation that silver ions permeate and diffuse to the ceramic substrate in the co-firing process of the electric silver slurry and the ceramic substrate is avoided, and the insulativity of the ceramic substrate is improved.

The invention discloses a silver particle modified and carbon coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of materials.The preparation method comprises the steps that a lithium source, an iron source, a manganese source and a phosphorus source are mixed and dissolved, and a mixed solution is obtained; adding a silver ion solution into the mixed solution, and carrying out a first hydrothermal reaction to obtain a reaction solution; mixing the reaction liquid with a carbon source and a reducing agent, carrying out a second hydrothermal reaction, and separating a solid phase to obtain a precursor; and sintering the precursor to obtain the lithium iron manganese phosphate positive electrode material. In the hydrothermal reaction stage, silver ions can inhibit rapid growth of high-energy crystal faces, and finally more high-energy crystal faces are exposed. And in the sintering stage, silver ions are reduced into simple substances to modify the carbon layer, a carbon-metal composite conductive network is formed, and the conductivity of the carbon layer is improved. The preparation method is simple and convenient to operate, can quickly and efficiently form the nanoscale lithium manganese iron phosphate positive electrode material with relatively good electrical properties and [001] crystal face orientation, and has a relatively good application prospect.

The invention provides a preparation method of high-specific-surface-area silver particles for low-temperature sintered silver paste, and belongs to the technical field of conductive materials, and the preparation method comprises the following steps: adding ammonia water into a hydrazine hydrate solution with the molar concentration of 1.60-6.0 mol / L until the pH value of the hydrazine hydrate solution is 10-13; the method comprises the following steps: preparing an alpha-amino acid aqueous solution with the molar concentration of 0.012-0.048 mol / L at the temperature of 35-45 DEG C; the preparation method comprises the following steps: dropwise adding a hydrazine hydrate solution and a silver nitrate solution into an alpha-amino acid solution at the same time within 8-12min, stirring, heating, adding a sodium hydroxide solution to adjust the pH value of a reaction solution to 11-13, continuously stirring, aging, separating, washing and drying to obtain the silver particles with high specific surface area. On the premise of ensuring the conductivity of the high-specific-surface-area silver particles, the particle size and the specific surface area of the silver particles are controllable, the requirement for the stability of the silver powder serving as the conductive filler is met, and the yield is high.

The invention discloses a preparation method of a wear-resistant magnetic composite nano ferroferric oxide material, and belongs to the technical field of nano ferroferric oxide materials.The preparation method comprises the steps that coated modified ferroferric oxide composite powder, silver nitrate and absolute methanol are added into a reaction kettle, stirring and ultrasonic dispersion are conducted, then 2-aminoterephthalic acid is added, stirring and mixing are conducted, and a mixture is obtained; and after the reaction, separating to obtain the wear-resistant magnetic composite nano ferroferric oxide material. The wear-resistant magnetic composite nano ferroferric oxide material prepared by the preparation method disclosed by the invention overcomes the problem that an existing ferrite material is relatively single in electromagnetic loss mechanism in the aspect of nickel-phosphorus plated fabric, and the electromagnetic shielding effectiveness of the fabric is improved; the coated modified ferroferric oxide composite powder has good dispersity, a polydopamine coating layer on the surface of the coated modified ferroferric oxide composite powder improves the anchoring effect on silver MOF particles through a mussel-like adhesion interface, meanwhile, stress is dispersed and crack propagation is reduced through the buffering effect of the polydopamine coating layer, and the mechanical stability of the wear-resistant magnetic composite nano ferroferric oxide material is improved.

The invention provides liquid metal and application thereof, a cathode material and a micro cathode arc thruster, and belongs to the technical field of alloy materials. The liquid metal provided by the invention comprises a liquid gallium alloy and metal particles, the mass ratio of the liquid gallium alloy to the metal particles is (3.78-4.62): (0.3-6); the metal particles comprise one or more of titanium particles, silver particles, gold particles, copper particles and aluminum particles. The surface tension of the liquid gallium alloy is reduced and the viscosity of the liquid gallium alloy is improved by adopting the metal particles, the metal particles can overcome slight vibration, are adsorbed on the surface of the metal feeding pipe and do not flow willfully, the metal particles serve as a cathode working medium of the micro-cathode arc thruster, stable work can be achieved, and the service life of the thruster is prolonged.

The invention provides a composite material solar interface evaporation device and a preparation method and application thereof. The solar interface evaporation device comprises a photo-thermal layer and a supporting layer, and a plurality of fluid transportation channels are formed in the supporting layer. The photo-thermal layer combines the carbon nano tube and the silver particles to generate an efficient photo-thermal conversion film, so that the photo-thermal conversion efficiency is improved; pVA is adopted as a curing film-forming agent, a PVA aqueous solution is firstly sprayed on the surface of the supporting layer through a laminated spraying method, then the photo-thermal layer is sprayed on the surface of the PVA film layer, and the photo-thermal layer is prevented from being stripped from the supporting layer; the supporting layer is of a hollow conical supporting structure prepared from PA12 through the selective laser sintering (SLS) 3D printing technology, and a capillary triangular tooth-shaped groove is designed to serve as a fluid conveying channel. The evaporation device achieves efficient photo-thermal energy utilization, high seawater evaporation rate and biological pollution resistance, has the advantages of being low in preparation cost, long in service life, environmentally friendly and the like, and has wide application prospects in the fields of seawater desalination and sewage treatment.

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of coating slurry, a silver-carbon negative electrode plate, a preparation method of the silver-carbon negative electrode plate and a solid-state battery. Compared with the prior art, by controlling the agglomeration degree of the silver material in the negative electrode active coating, silver and carbon particles can be uniformly dispersed, and on the basis of avoiding the generation of lithium dendrites, attachment sites and spaces of the silver particles on the carbon particles are increased, so that the safety performance and the electrical performance of the battery are improved.

A conductive ink composition contains a (meth)acrylic polymer (A) and silver particles (B). The (meth)acrylic polymer (A) has a glass transition temperature of ≤0° C., a weight average molecular weight of ≥500,000, and a hydroxyl value of more than 50 mgKOH / g. The silver particles (B) have a specific surface area of 0.5 to 3.0 m2 / g, a 50% average particle diameter of 0.5 to 14.0 μm, a maximum particle diameter of ≥8 μm, and a solid content from 50 to 80% by mass. Another conductive ink composition contains a (meth)acrylic polymer (A) and carbon black (CB). The (meth)acrylic polymer (A) has a glass transition temperature of ≤0° C., a weight average molecular weight of ≥500,000, and a hydroxyl value of more than 50 mgKOH / g. The carbon black (CB) has a specific surface area of ≥50 m2 / g, an aggregate diameter of ≤400 nm, and a solid content from 15 to 30% by mass.

The invention relates to the technical field of micro-nano particle preparation, and discloses particle size controllable micro-nano silver powder and a preparation method thereof.The preparation method comprises the steps that S1, micron-sized silver cores and nano-sized silver particles are prepared; s2, performing surface activation on the micron-sized silver core; s3, filling pore gaps of a porous template with the micron-sized silver cores; s4, spraying graphene dispersion liquid on the porous template, and forming graphene network coverage on the surface of each silver core; and S5, after the porous template is removed, nanoscale silver particles are deposited on the surface of the exposed silver core, and a silver shell structure wrapping the silver core and the graphene network is formed. Through gradient compounding of a micron silver core-graphene network-nano silver shell structure, the width difference between two sintering necks formed between the circuit board and connecting plate interfaces on the two sides during sintering is reduced by effectively utilizing the wettability of a nano silver shell and the stress dispersity of graphene, and meanwhile the excellent electrical conductivity and thermal conductivity of the material are utilized; and the sintering performance of the circuit board is optimized.

The invention relates to a porous silver-carbon composite material which contains a carbon powder. The carbon powder contains porous carbon particles, and the carbon particles have pores with an open and continuous pore structure. The porous silver-carbon composite material further contains silver particles, which are at least partly bonded to the surface of the porous carbon particles. The silver-carbon composite material can be used in an electrode of a solid-state battery.

The invention discloses a preparation method of an integrated collector plate for a vanadium battery. The preparation method comprises the following steps: preparing foamed nickel deposited by carbon nanotubes; pressing the conductive particles into sheets, sequentially putting the conductive sheets, the modified foamed nickel and the conductive sheets into a mold, and integrally forming by using a hot press to obtain the composite bipolar plate. Silver-copper composite powder is prepared by plating silver on the surface of copper powder through chemical plating, conductive adhesive containing silver-copper metal powder is prepared, and a copper plate and a composite bipolar plate are bonded through the conductive adhesive to prepare the integrated collector plate. The foamed nickel is used as a framework material, the interface between the foamed nickel and the carbon composite layer is improved by depositing the carbon nanotubes on the surface of the foamed nickel, the mechanical strength and the conductivity of the composite bipolar plate are improved, nano-scale silver particles on the surface of the copper powder can be melted by performing heat treatment on the silver-copper composite powder, a continuous silver film is formed, and the conductivity of the composite bipolar plate is improved. The conductivity and oxidation resistance of the conductive adhesive are improved, and the contact resistance between the bipolar plate and a copper plate is reduced, so that the performance of the flow battery is improved.

The present application relates to the technical field of bacteriostatic impregnated paper preparation, and discloses a bacteriostatic impregnated paper and a preparation method thereof, wherein a melamine impregnated paper substrate is impregnated with an impregnating solution; a rate regulating coating is coated on the surface of the substrate, so that the release rate of the bacteriostatic component is regulated according to the change of environmental pH value; wherein the surface of the rate regulating coating is further coated with a nano-silver particle layer, and the components of the impregnating solution include the following raw materials in percentage by weight: tea tree oil 0.5-2%, cinnamaldehyde 1-3%, lemon essential oil 0.5-1%, ethanol 70-80% and water; the present application provides a multi-layer protection mechanism, which can not only effectively kill various bacteria and fungi, but also prolong the duration of the bacteriostatic effect; the presence of the nano-silver particle layer enhances the long-term bacteriostatic effect, and even after long-term use, the high-efficiency antibacterial performance can be maintained; the introduction of the pH-sensitive polymer coating enables the release rate of the bacteriostatic component to be automatically regulated according to the change of environmental pH value.

The invention provides a perovskite solar cell, a preparation method thereof and a photovoltaic module, and the perovskite solar cell comprises a substrate, a first carrier transmission layer, a perovskite absorption layer, a second carrier transmission layer and an electrode layer which are sequentially stacked. And a nano-silver particle layer is arranged between the first carrier transport layer and the perovskite absorption layer. According to the invention, the nano-silver particle layer is used as a crystal nucleus, so that the crystallization of the perovskite absorption layer is promoted, and the high-quality perovskite thin film with large grain size and low defect density is formed; in addition, the particle surface of the nano-silver particle layer can reflect sunlight, a light trapping structure is formed, and the utilization rate of light can be remarkably improved. In conclusion, the photoelectric property of the perovskite solar cell can be effectively improved, and the perovskite solar cell has a wide application prospect.

The invention provides a preparation method of silver-coated copper powder, and belongs to the technical field of metal powder treatment. The used copper particle suspension contains a complexing agent, so that the activity of the copper particles can be reduced, the reaction rate of reduction coating can be reduced when a silver-ammonia complexing solution is added, and a compact silver layer slowly and uniformly grows on the surface of each copper particle; the reduction of the activity of the copper particles slows down the replacement reaction of silver ions and copper, and the situation that the coating surface is rough and loose due to the generation of overlarge silver particles is avoided; the silver grows slowly and compactly, so that the surface of the coated silver layer is smooth and compact on the basis of lower usage amount of the silver source; the preparation method is simple in process, low in silver content and low in production cost, and the coated silver layer is smooth and compact in surface.