809 results about "Metal nanoparticles" patented technology

The invention discloses a composite negative electrode material and a preparation method thereof and a lithium battery, the composite negative electrode material provided by the invention comprises a three-dimensional porous carbon material, and a lithium-loving metal and a lithium metal which are loaded on a three-dimensional porous carbon skeleton, and the three-dimensional porous carbon material is prepared by taking a ZIFs precursor as a raw material. The three-dimensional porous carbon material prepared by taking the ZIFs precursor as a raw material has a Zn / N-containing double-doped three-dimensional porous carbon skeleton, so that the problems of poor conductivity, insufficient lithium storage aperture and the like of the existing carbon skeleton are solved; a plurality of lithium-loving metal nanoparticles are loaded on the surface of the carbon skeleton, so that the lithium-loving property and the electron conductivity of the carbon skeleton are further enhanced, the uniform deposition of lithium is facilitated, and the growth of dendrites is inhibited; the porous carbon skeleton limits the lithium deposition space, the doped nanoparticles provide lithium-loving sites to guide uniform nucleation, the dual mechanisms synergistically inhibit dendritic crystal growth, and the safety of the lithium metal negative electrode is improved.

The invention belongs to the technical field of engineered probiotics, and particularly relates to engineered probiotics for radiosensitization and tumor metabolism regulation as well as a preparation method and application of the engineered probiotics. The engineering probiotics comprise probiotics and core-shell type metal nanoparticles which are loaded on the probiotics and are synthesized through a biological directional mineralization effect; the core of the core-shell type metal nanoparticle is a palladium element, and the outer layer of the core-shell type metal nanoparticle is a palladium element and a gold element. The engineering probiotics provided by the invention have excellent enzyme catalysis performance and can target and retain in tumor sites, and through the synergistic effect of all components in the engineering probiotics, adenosine metabolism is effectively inhibited, secretion of pro-inflammatory cytokines is enhanced, tumor microenvironment is promoted to be converted into an inflammatory state, up-regulation of immune checkpoints is inhibited, and the immune checkpoints are inhibited. And T cells are inhibited from being transformed into depletion phenotype and transformed into effect type from depletion type. After the SBRT and the immune checkpoint inhibitor are combined for use, the growth of tumors can be effectively inhibited, and the effect of enhancing immune radiotherapy is achieved.

The invention relates to the technical field of preparation of nano catalytic materials, in particular to a preparation method of hierarchical pore channel mesoporous carbon loaded metal nanoparticles. According to the invention, biomass diatomite is used as a template to construct a vertically through macroporous channel, a block copolymer is introduced to form an ordered mesoporous structure, and a pore-foaming agent is added to generate a macro-pore network in a pyrolysis process, so that a macro-pore-mesoporous-micropore three-level communicated carbon-based skeleton is realized; and a bimetallic component is loaded on the hierarchical porous mesoporous carbon in a gradient confinement manner. The material disclosed by the invention has the advantages of fast mass transfer of macropores, stable nanoparticles of mesoporous confinement and efficient catalysis of monatomic sites, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention provides a compound disinfectant for preventing and treating aquaculture virus diseases and a preparation method thereof. The composite disinfectant is prepared by introducing polyhexamethylene guanidine or a salt thereof, a quaternary ammonium salt compound, metal nanoparticles and an auxiliary agent into a water system as main raw materials, and is prepared by the following steps: adding a quaternary ammonium salt compound solution and a penetrating agent into a polyhexamethylene guanidine or salt solution thereof, and uniformly stirring and mixing to obtain a mixed solution A; slowly dropwise adding the metal nanoparticle dispersion liquid into the mixed solution A, starting ultrasonic treatment at the same time, and uniformly stirring and mixing to obtain a mixed solution B; dropwise adding the pH regulator solution into the mixed solution B, regulating the pH, adding the preservative solution, supplementing water, uniformly mixing, standing and curing to obtain the composite disinfectant. The compound disinfectant aims at achieving synergistic interaction, finally achieves the comprehensive prevention and treatment effects of being efficient, low in toxicity, broad in spectrum and not prone to inducing drug resistance, and particularly achieves efficient and safe prevention and control on fish, shrimp and crab virus diseases so as to meet the urgent requirement for healthy aquaculture.

A method for manufacturing a semiconductor structure includes: forming a first bonding layer on a device substrate, the first bonding layer including a first bonding sub-layer and a second bonding sub-layer, the first bonding sub-layer including a first metal oxide material in an amorphous state and a plurality of metal nanoparticles, the second bonding sub-layer including a second metal oxide material in an amorphous state; forming a second bonding layer on a carrier substrate, the second bonding layer including a third metal oxide material in an amorphous state; conducting a surface modification process on the first and second bonding layers; bonding the device and carrier substrates to each other through the first and second bonding layers; and annealing the first and second bonding layers to convert the first, second, and third metal oxide materials from the amorphous state to a crystalline state.

The invention discloses a negative electrode composite current collector of a non-negative electrode lithium battery and a preparation method of the negative electrode composite current collector. The preparation method comprises the following steps: preparing a metal nanoparticle-metal organic framework composite material MNP-MOF-NH2 by adopting a solvothermal method; the preparation method comprises the following steps: adding MNP-coated MOF-NH2, a conductive agent and a binder into a solvent, mixing and uniformly stirring to obtain a negative electrode coating slurry, coating the surface of a negative electrode current collector foil with the negative electrode coating slurry to form a first coating, placing the first coating in a reaction chamber of atomic layer deposition equipment, introducing a metal source and gas in an alternate feeding deposition mode to generate a layer of compact lithium-loving metal oxide, and carrying out vacuum drying to obtain the lithium-loving metal oxide negative electrode. And drying to obtain a double-gradient composite protective layer, namely the negative electrode composite current collector of the non-negative electrode lithium battery. According to the invention, a double-layer structure of a compact lithium-loving layer, a porous metal organic framework and a metal particle composite layer is constructed, and the upper lithium-loving metal oxide induces uniform nucleation of lithium, so that the deposition barrier is reduced. The network structure of the lower layer MOF provides a space limiting effect to accommodate and separate lithium deposition, in addition, polar groups contained in the MOF promote desolvation and transport of Li +, and metal nanoparticles accelerate ion / electron transport.

The invention relates to a method and a system for reversibly regenerating an inactivated carbon dioxide reduction electrode based on electro-catalysis, which comprises the following steps: firstly, controllably removing pollutants on the surface of the electrode by reversely applying an oxidation potential, and then introducing an electroplating solution containing metal ions and applying a dynamic reduction potential; metal nanoparticles are deposited on active sites on the surface of the catalyst in situ, and the active sites are reconstructed and optimized. According to the method, the initial catalytic performance of the electrode can be basically recovered, the catalytic activity can be recovered, the operation process is compatible with the continuous production requirement, and a core guarantee is provided for efficient and continuous industrial application of the electrocatalytic carbon dioxide reduction technology.

The invention relates to a preparation method and application of a two-dimensional ultrathin porous nitrogen-doped carbon composite material. According to the invention, a metal salt nitrate ion mediation method is adopted, and the ultrathin porous carbon nanosheet loaded with metal single atoms and metal nanoparticles is successfully prepared through decomposition of a prepolymerized dopamine-metal salt precursor. By changing the type of metal salt ligand anions, accurate regulation and control between a non-porous structure and a porous structure can be realized. Endogenous multi-scale pore defects are introduced into the surface of the carbon nanosheet, so that the impedance matching of the prepared carbon nanosheet system is effectively improved, and meanwhile, high conductivity is kept. According to the prepared material, the dielectric constant is improved by introducing a porous structure, impedance matching is optimized, and the electromagnetic wave absorption capacity is improved.

The present application relates to the technical field of nano-catalytic material preparation, in particular to a preparation method of multi-stage pore mesoporous carbon loaded metal nanoparticles, which constructs vertical and through macroporous channels by taking biomass diatomite as a template, forms ordered mesoporous structure by introducing block copolymer, and realizes macro-pore-mesopore-micropore three-stage communication of carbon-based skeleton by adding porogen to produce macro-porous network in the pyrolysis process, and gradientally limits and loads bimetallic components on the multi-stage pore mesoporous carbon. The material has the advantages of macroporous rapid mass transfer, mesoporous limited stable nanoparticles and single-atom site efficient catalysis, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention provides a black TiO2 nanosheet (at) Pt nanoparticle photoelectric catalyst and a preparation method and application thereof in methane photoelectric catalytic conversion, black TiO2 is prepared by introducing surface defects (such as oxygen vacancies) so as to expand the visible light response range of the black TiO2, and the surface of the black TiO2 is modified by precious metal nanoparticles (such as Pt), so that the visible light response range of the black TiO2 is expanded. While the photo-induced electron separation is promoted and the catalytic activity is improved, the overall conductivity and the interface electron transfer rate are remarkably improved. Particularly, TiO2 is constructed into an ultrathin two-dimensional nanosheet structure, so that not only can a larger specific surface area and more reaction active sites be provided, but also the diffusion path of photon-generated carriers can be shortened, and the recombination probability can be effectively reduced, thereby further enhancing the photoelectric conversion efficiency. Compared with the prior art, the catalyst provided by the invention has the advantages of ultrathin two-dimensional structure, surface defect regulation and precious metal synergistic modification, and can realize efficient visible light driven photoelectrocatalytic methane conversion.

The invention discloses a seawater initiation preparation method of metal wet gel and aerogel and application of the seawater initiation preparation method in electro-catalysis ethylene glycol oxidation. Comprising the following steps: 1) sequentially adding a metal salt, sodium citrate and a reducing agent into pure water, 2) adding seawater into a reaction solution to obtain wet gel, and 3) washing and drying the wet gel to obtain the aerogel. Seawater can be used for replacing expensive drugs used in a large amount in a salting-out method and an excessive sodium borohydride method, so that the metal nanoparticle solution is unstable, the metal aerogel material is prepared, and the preparation cost of the metal aerogel is greatly reduced. The metal aerogel obtained by the invention shows excellent catalytic performance in the application of electro-catalysis of ethylene glycol oxidation.

The invention provides a refractive index sensor based on surface lattice resonance, belongs to the technical field of micro-nano sensors, and aims to solve the problem that the sensitivity and quality factor are low when the environmental refractive index is detected. The structure of the refractive index sensor sequentially comprises a substrate, a metal layer, a dielectric layer and a periodic structure layer from bottom to top, the periodic structure layer is an array formed by periodically arranging metal nanoparticles according to a rule, and the metal nanoparticles are hemispherical metal nanoparticles. The sensor device provided by the invention can realize high refractive index sensitivity and high quality factor, the refractive index sensitivity reaches 562.42 nm / RIU, the quality factor (FOM) is 54.38 RIU-1, and the sensor device is very suitable for biomedical sensing application.

The invention discloses a preparation method of L-5 methyltetrahydrofolic acid based on an MOFs catalyst, and high-selectivity hydrogenation and methylation of folic acid are realized under mild conditions by designing MOFs material loaded noble metal nanoparticles with a chiral confinement effect. The method does not need an optical resolution step, and the ee value of the product is gt; and the catalyst can be recycled, so that the method is suitable for industrial production.

Disclosed is a photodetector, preferably a mid-infrared photodetector, composition comprising semiconductor particles (101) comprising a band gap of less than 1.5 eV, preferably less than 1eV, and metal nanoparticles (103), wherein the semiconductor particles are interconnected via electrically conducting bridges (102) comprising the metal nanoparticles thereby forming an electrically conductive network. A photodetector comprising the composition and a method of manufacturing the composition are also described.

The application discloses a metal organic framework reference solid-state electrolyte and a preparation method and application thereof, the electrolyte takes a commercial diaphragm as a base, takes a metal organic framework as a carrier, and has metal nanoparticles deposited on the base; wherein the metal nanoparticles provide nucleation sites for the metal organic framework on the base; the thickness of the metal organic framework layer of the electrolyte is 0.2-30 microns, and the mass of the electrolyte is 0.2-30 mg / cm 2 The application has the following advantages: (1) the electrolyte can construct a high specific energy lithium metal battery; (2) the electrolyte has excellent mechanical stability, and can still maintain structural stability even after experiencing hundreds of electrochemical cycles; (3) the electrolyte has good compatibility with lithium metal, and can significantly improve the cycle life of the lithium metal battery; and (4) a soft package battery of LiNi 0.8 Co 0.15 Al 0.05 O2 / / Li (NCA / / Li, 3-35 mg cm ‑2 NCA loading) has an energy density of 200-450 Wh / kg and stable electrochemical performance (50-1000 cycle life, 60-95% capacity retention rate).

There is provided an antimicrobial composition comprising: an antimicrobial compound; and a population of metal nanoparticles. Also described is a method of producing such an antimicrobial composition, a coating or treatment for a surface or substrate comprising such an antimicrobial composition, and a medical device comprising such a coating or treatment.

The invention relates to the technical field of phase-change materials, and discloses a light-operated composite phase-change material catalyst and a preparation method and application thereof, and a light-operated phase-change composite material is a paraffin-encapsulated metal M / halloysite / sodium alginate composite phase-change material; according to the metal M / halloysite / sodium alginate composite phase change material for packaging the paraffin, halloysite / sodium alginate aerogel loaded by metal M nanoparticles is used as a supporting material, and the paraffin is packaged in the metal M / halloysite / sodium alginate composite phase change material. According to the invention, the metal M / halloysite / sodium alginate composite phase change material for packaging paraffin is prepared by using the halloysite nanotube, the aerogel in the invention has a relatively large paraffin encapsulation amount, the encapsulation efficiency can reach up to 86%, and the phase change material can still maintain good mechanical and chemical stability after multiple heat absorption and release cycles. The melting and solidification of paraffin in the composite phase change material are controlled by turning on and turning off the light source, and the exposure and shielding of active sites are realized, so that the catalytic reaction is accurately started and stopped, and the complete starting and pausing of the reaction are realized.

The present invention discloses an electromagnetic absorption composite material, its preparation method, and its application. The composite material comprises graphene; metal nanoparticles coated with carbon shells are interspersed within the graphene's layered structure. The electromagnetic absorption composite material of the present invention has an intercalated structure, with metal nanoparticles interspersed within the graphene. The surface of the nanoparticles is coated with carbon shells to form a core-shell structure, which improves the electromagnetic absorption performance of the material by enhancing multiple reflection losses.

The invention belongs to the field of new energy nano material technology and water electrolysis hydrogen production, and particularly relates to a vacancy-rich Ru / RuSex heterostructure electrocatalyst as well as a preparation method and application of the vacancy-rich Ru / RuSex heterostructure electrocatalyst. The electrocatalyst is composed of a cubic phase RuSe2 matrix rich in selenium vacancy and metal Ru nano-particles which are uniformly distributed and stably anchored on the surface of RuSe2. The preparation method comprises the following steps: synthesizing precursor RuSe2 powder by a hydrothermal method, and carrying out Joule heating treatment on the RuSe2 powder in an inert atmosphere or a reducing atmosphere environment to obtain the vacancy-rich Ru / RuSex heterostructure electrocatalyst. The catalyst disclosed by the invention shows excellent hydrogen evolution performance under alkaline water and alkaline seawater conditions, and overpotentials of only 21 mV and 26 mV under the current density of 10 mA. Cm <-2 > are respectively realized; and the battery can stably run for 400 hours under the current density of 800mA. Cm <-2 >.

The invention provides a process for preparing a three-dimensional graphene foam metal composite material by a biological template method. The preparation method comprises the following steps: preparing through an innovative biological template method process, carrying out carbonization-activation treatment on a natural hierarchical porous biological structure serving as a sacrificial template to form a three-dimensional graphene foam skeleton with bionic hierarchical pore channels, and carrying out in-situ compounding of copper / silver metal nanoparticles through a pulse electrodeposition technology to obtain the composite material. And finally, the three-dimensional graphene foam metal composite material with ultrahigh thermal conductivity and eco-friendly characteristics is constructed. The core breakthrough of the heat-conducting property is as follows: a bionic heat transfer framework is optimized, graded pores derived from a biological template form a phonon efficient transfer path, and the axial heat conductivity is improved by more than 40% compared with that of a material prepared by a traditional chemical foaming method; according to graphene-metal interface cooperation, metal nanoparticles directionally grow on the edge of a graphene sheet layer and hole wall defect sites, and interface thermal resistance is reduced to 8.7 * 10 <-9 > m < 2 > K / W by forming a coherent interface; cross-scale heat flow guide control is achieved, specifically, phonon conduction with the in-plane heat conductivity being 1600 W / (m.K) is achieved through a high-crystallinity graphene domain in a micropore, and an electron conduction heat diffusion network is constructed through a metal filling layer in a macropore channel.

The application provides a temperature self-compensation strain sensor sensitive layer composite material and a preparation method thereof, and belongs to the technical field of functional materials. The composite material is prepared from raw materials including the following mass percentages: metal nanoparticles 25-35%, insulating oxide nanoparticles 2-3%, dispersing agent 0.1-0.5%, and the balance solvent; the metal nanoparticles have a positive temperature coefficient of resistance; and the insulating oxide nanoparticles include aluminum oxide nanoparticles, silicon oxide nanoparticles, zirconium oxide nanoparticles or chromium oxide nanoparticles. The composite material provided by the application can be used as a sensitive layer of a temperature self-compensation strain sensor, can avoid strain signal disturbance caused by environmental temperature changes, can make the strain sensor have a temperature self-compensation function, and can further simplify the system of the strain sensor without using an external circuit and without changing the size and structure of the strain sensor.

The invention provides an SERS (Surface Enhanced Raman Scattering) sensing chip with a conical periodic array structure as well as a preparation method and application of the SERS sensing chip. The SERS sensing chip with the conical periodic array structure comprises a conical periodic array structure substrate, a metal layer, a hollow dielectric layer and a metal nanoparticle layer which are sequentially stacked. The SERS sensor chip has the advantages of high enhancement performance, high detection sensitivity, uniform detection signals and the like, and is widely applied to the fields of environment detection, food safety, industrial production, human health detection and the like.

The invention provides a platinum-based catalyst and a preparation method and application thereof, and belongs to the technical field of fuel cells. The preparation method comprises the following steps: mixing a polymer solution, a conductive agent and a zeolite imidazate framework material to obtain an electrostatic spinning solution; carrying out electrostatic spinning on the electrostatic spinning solution, and then carrying out heat treatment to obtain composite nanofibers containing metal nanoparticles or metal oxide nanoparticles; and mixing the composite nanofiber, a platinum source and an organic solvent, and carrying out a reduction reaction to obtain the platinum-based catalyst. According to the preparation method, the polymer solution, the conductive agent and the zeolite imidazate framework material are mixed, and uniform distribution of all the components on the nanoscale can be ensured by virtue of an electrostatic spinning technology, so that a stable and efficient three-phase interface can be formed; the metal nanoparticles or metal oxide nanoparticles obtained by conversion are compounded with platinum particles, so that the catalyst exposes more active sites, and the efficient proceeding of the catalytic reaction is facilitated.

The invention belongs to the field of catalysts, and provides a regenerated supported metal catalyst for growing a single-walled carbon nanotube and a preparation method of the regenerated supported metal catalyst. Comprising the following steps: growing the SWNTs by taking gases such as CO, CH4, C2H2 and the like as carbon source gases through a CVD (Chemical Vapor Deposition) method on an oxide carrier loaded metal (such as Fe, Co and Ni) catalyst. And then dissolving the metal nanoparticles by using strong acid (such as hydrochloric acid), introducing an alkali precipitator into an acidic leaching solution, and carrying out coordination recombination on metal ions and the carrier magnesium oxide through pH regulation and control to realize reloading of the active components on the surface of the carrier. After the regenerated catalyst is calcined and activated, the SWNTs are grown again under the same CVD condition, and the high-purity SWNTs can be controllably prepared through multiple regeneration and growth processes. According to the scheme, the inherent limitation of single use of the supported metal catalyst is broken through, the yield of the SWNTs is improved, the discharge of acid waste liquid is effectively reduced, and the utilization rate of the metal catalyst is improved.

An actuator includes a twisted and coiled polymer fishing line and an untwisted resistance heating wire (TCPFLRHW) actuator and a coating on the TCPFLHRW actuator. The coating includes a mixture of carbon nanotubes, metal nanoparticles, and mesoporous carbon nanoparticles, and in some variations, the coating includes a polymer matrix with the carbon nanotubes, metal nanoparticles, and mesoporous carbon nanoparticles disposed in the polymer matrix. And the actuator exhibits enhanced actuator parameters such as actuator efficiency, hydrophobicity, power consumption, actuation frequency, dynamic actuation and cooling rate.

The invention relates to the technical field of semiconductors, and discloses a deep ultraviolet LED structure and a preparation method thereof, the deep ultraviolet LED structure comprises an LED substrate, and the LED substrate comprises a substrate, a non-doped AlN buffer layer, a GaN / AlN superlattice layer, an n-type AlGaN layer, an active layer, a p-type AlGaN layer and a p-type GaN cover layer which are stacked in sequence; openings of the plurality of nanoholes are located in the surface of one side, back to the p-type AlGaN layer, of the p-type GaN cover layer, and the nanoholes penetrate through the p-type GaN cover layer, the p-type AlGaN layer and the active layer; the isolating layer is positioned on the inner wall of the nanopore; and the metal nanoparticles are located on the surface of one side, back to the p-type AlGaN layer, of the p-type GaN cover layer and cover the surface of one side, back to the inner wall of the nanopore, of the isolation layer. According to the deep ultraviolet LED structure, the LSPR effect between the metal nanoparticles and the active layer can be enhanced, the light output intensity and effect are improved, and the forward light output intensity and effect of the deep ultraviolet LED structure are improved.

The invention relates to a memristor and a preparation method and application thereof. The memristor structurally comprises a bottom electrode, a tunneling layer, a nanoparticle layer, a resistive layer and a top electrode from bottom to top, the nano-particle layer is made of metal nano-particles; and the resistive layer is made of a low-dimensional rare earth boride nano material. According to the memristor with the specific structure, the dynamic electron release and capture process between the metal nanoparticles in the nanoparticle layer and the low-dimensional rare earth boride nanomaterial of the resistive layer is used as a physical entropy source to enable current signals to maintain binary distribution for a long time; therefore, the memristor generates a random telegraph noise current signal with high stability, and the memristor can be used as a random entropy source of a true random number generator to generate an unpredictable binary number in a real-time transmission process of a hardware encryption system.

The present invention relates to a Ru-Ni bimetallic catalyst for the selective hydrogenation of a quinoline organic hydrogen storage carrier, and a preparation method therefor and the use thereof. In the catalyst, carbon nitride is used as a carrier, and metal nanoparticles Ru and Ni serve as active components and are jointly loaded on the carbon nitride carrier; and the carbon nitride is prepared by mixing carbon tetrachloride, ethidene diamine and nano-silica, reacting same to obtain a carbon nitride polymer, then calcining same at 750-850ºC, performing a desilicification treatment, and then filtering and drying same. The catalyst provided in the present application has good catalytic hydrogenation performance in the selective hydrogenation of the quinoline organic hydrogen storage carrier and can achieve the omission of a solvent in a reaction system; the reaction is simple, green and environmentally friendly, and the gravimetric hydrogen storage density of the system can be maximally ensured when a quinoline compound is used as an organic hydrogen carrier; moreover, the catalyst also has a good cycling stability.

The invention belongs to the technical field of polymer composite materials, and discloses a leather collagen fiber / polyurethane composite material and a preparation method thereof. The metal-polyphenol coordination network interface layer provided by the invention is accurately positioned on the surface of the leather collagen fiber and is between the fiber and a waterborne polyurethane matrix, and a three-stage structure of'fiber-interface layer-matrix 'is constructed. The interface layer forms a stable network through coordination of metal nanoparticles and polyphenol, and forms chemical bridging with a WPU matrix through secondary bonding. According to the structure, the tearing strength and the tensile capacity of the composite material are greatly improved, the limitation that reinforcement and toughening are difficult to consider in traditional physical blending modification is broken through, and a synergistic reinforcement effect is generated.

Disclosed are compositions comprising extracts of kale and a number of other plants in synergistic mixtures. Methods of forming metal nanoparticles and nanoparticles formed using the methods are disclosed.