1479 results about "Metal nanoparticles" patented technology

The invention relates to a preparation method of antibacterial and anti-mite healthy cotton fibers based on compounding of copper-silver alloy and graphene fibers. The preparation method comprises the following steps: synthesizing Cu-Ag alloy with a pomegranate-shaped structure, preparing copper-silver core-shell double-metal nanoparticles, preparing a copper-silver double-metal core-shell nanoparticle material, performing surface modification on a copper antibacterial agent, preparing a nano anti-mite antibacterial finishing agent, preparing a graphene / carbon nanofiber composite material, and preparing the antibacterial anti-mite healthy cotton fiber. A vacuum hot pressing method and a sintering method are creatively combined, and the prepared antibacterial anti-mite healthy cotton fiber endows bedding with excellent antibacterial, anti-mite and various healthy functions and has the advantages of excellent antibacterial performance, efficient anti-mite function, improved tensile strength and the like.

The invention discloses an acylhydrazone bond-linked three-component covalent organic framework material and application thereof in photocatalytic full-decomposition of water. The three-component COFs expands the designability of the structure and function of the porous organic material by generating ordered anisotropic tiling and ordered pores with abnormal shapes. In addition, COFs connected through acylhydrazone bonds have good thermal stability and chemical stability, and nitrogen atoms on the acylhydrazone bonds can provide a large number of sites for load metal. According to the invention, two electron-deficient and electron-rich nodes are introduced into a COFs framework to form a donor-pi-acceptor structure motif, and Pt metal nanoparticles are loaded onto a three-component covalent organic framework material by using a NaBH4 reduction method. The material has great potential in the aspect of producing H2 and H2O2 through photocatalytic full decomposition of water by taking water as a reactant while solar energy is utilized and a sacrificial agent is not added.

The invention relates to a silicon-based negative electrode material for a sulfide solid-state lithium battery, which is prepared by the following method: mixing silicon powder and sulfide solid-state electrolyte, performing ball milling, adding a lithium alloy lithium supplement agent, and continuing ball milling to obtain mixed powder; and uniformly mixing the mixed powder with the metal nanoparticles to obtain the silicon-based negative electrode material, so that the electronic conductivity and the ionic conductivity of a silicon negative electrode can be improved at the same time. The lithium supplement agent selects a lithium alloy material, has good compatibility with sulfide electrolyte, and can effectively inhibit the volume expansion coefficient of a silicon negative electrode after being added; and secondly, along with the synchronous improvement of the electron conductivity and the ion conductivity of the negative electrode, the multiplying power and the coulombic efficiency of the total battery can be comprehensively improved, and the stability limitation of the negative electrode interface is improved.

The invention is applicable to the technical field of conductive adhesives, and provides a conductive nanoparticle-doped epoxy resin conductive adhesive which comprises the following raw materials in parts by weight: 0.05-4 parts of conductive metal nanoparticles, 0.03-6 parts of conductive polymer nanoparticles, 45-80 parts of modified flaky silver-coated copper powder, 10-50 parts of epoxy resin, 10-30 parts of a curing agent, 0.001-1 part of an accelerant and 0.2-0.6 part of a modifier. The invention further provides a preparation method of the epoxy resin conductive adhesive doped with the conductive nanoparticles. The invention also provides application of the epoxy resin conductive adhesive doped with the conductive nanoparticles in preparation of a semiconductor packaging material. The conductive metal nanoparticles and the conductive polymer nanoparticles are introduced into the formula of the conductive adhesive in a doping manner, the usage amount of the micron silver coated copper powder can be reduced on the premise of ensuring that the conductive adhesive has good conductivity, and the preparation method is convenient to operate, simple and easy to implement and low in raw material price.

The invention discloses a preparation method of a small-size defective cerium-based MOFs supported metal catalyst for hydrogenation, and belongs to a preparation technology of a nano composite catalytic material. The preparation method comprises the following steps: in a cerium-based MOFs synthesis process, introducing a proper amount of monocarboxylic acid as a regulator to synthesize a cerium-based MOFs carrier with adjustable defects and size, then loading a metal active component to the cerium-based MOFs carrier, and combining adjustment of reduction conditions to prepare the cerium-based MOFs loaded metal composite catalyst with small-size defects for DCPD hydrogenation. The defects and the size of the cerium-based MOFs carrier are effectively regulated and controlled through the monocarboxylic acid regulator, controllable regulation of the electronic state, the size and the catalytic activity of the loaded metal active component can be achieved by combining regulation and control of the reduction condition of the loaded metal nanoparticle active component, the process is simple, parameters are controllable, the period is short, and the method is suitable for DCPD hydrogenation large-scale production.

The invention relates to the technical field of drilling fluid cooling, and discloses a phase change microcapsule suitable for drilling fluid cooling and a preparation method thereof.The phase change microcapsule comprises a capsule wall stabilizing material and a capsule core phase change material, and the capsule wall stabilizing material comprises polyurethane, polyurea, polyamide, polyimide, polystyrene and a first organic solvent; the capsule core phase change material comprises paraffin, fatty acid, polyol, inorganic hydrated salt, polymer gel, expanded graphite, carbon nanotubes, metal nanoparticles and a second organic solvent, and the first organic solvent is at least one of toluene, xylene, cyclohexanone and the like. The temperature of the drilling fluid is kept at a relatively low level, the cooling of the drilling fluid is realized, so that the drilling efficiency is improved, harmful solvents and additives are not used in the preparation process of the phase-change microcapsules, the phase-change microcapsules are pollution-free to the environment, and the requirements of greenness and environmental protection are met.

The present disclosure relates in some aspects to methods and compositions for in situ detection of an analyte in a biological sample embedded in a matrix that is attached to metal nanoparticles. In some embodiments, the detection involves generation of a fluorescent signal that is enhanced by the metal nanoparticles. The fluorescent signal can be detected at a 3-dimensional (3D) location in the matrix which corresponds to the 3D location of the analyte in the biological sample.

The present invention provides a composition comprising a Ferritin-metal nanoparticle bioconjugate, wherein the Ferritin-metal nanoparticle bioconjugate comprises at least one metal nanoparticle and at least one Ferritin or a variant or a fragment thereof conjugated to the at least one metal nanoparticle; and wherein the Ferritin-metal nanoparticle bioconjugate specifically targets at least one cell expressing a transferrin receptor 1 (TfR1), and methods of making and use thereof.

The invention relates to a preparation method and application of an electrochemical-colorimetric dual-mode sensor based on nanoflowers and a bifunctional NiFe-PBA nano enzyme. The NiFe-PBA loaded gold-platinum bimetallic nanoparticles have excellent oxidation-reduction activity and peroxidase activity, and are used as a bifunctional probe to construct an electrochemical colorimetric dual-mode sensor. More signal probes are introduced into the branched DNA structure to participate in the reaction, the specificity of the sensor is enhanced through specific recognition of the aptamer on OTA, and finally, an electrochemical and colorimetric dual-mode channel is ingeniously constructed by utilizing a magnetic separation technology, so that environmental interference is effectively reduced, and false positive signals are avoided. NiFe-PBA loaded gold-platinum bimetallic nanoparticles participate in the dual-mode channels, so that the experimental operation is simplified while the signal response caused by the target is realized. The dual-mode sensor constructed by the invention has the characteristics of sensitivity, reliability, rapidness and stability, and is beneficial to popularization and application. And the biosensor has good anti-interference capability and practical application capability, and provides a novel biosensing platform for practical sample analysis.

The invention discloses a metal-doped molybdenum disulfide composite super-smooth coating and a preparation method thereof, and belongs to the technical field of composite super-smooth coatings. The invention discloses a preparation method which comprises the following steps: sputtering metal palladium on a substrate by adopting a direct-current power supply to obtain a metal transition layer, depositing a molybdenum disulfide target on the metal transition layer by adopting a pulsed power supply, and preparing a metal-doped molybdenum disulfide composite super-smooth coating by adopting a double-target co-sputtering mode. The metal nanoparticles and the vertically oriented MoS2 sheet layer in the film are co-grown and have strong interaction to form the T-shaped array type Ag-MoS2 low dangling bond film, dangling bonds can be encapsulated to the maximum extent, the internal order degree of the film is improved, and the number of dangling bonds is reduced; meanwhile, the density and the oxidation resistance are ensured.

The present disclosure refers to a method for building a SERS substrate from metal nanoparticles for determining the content of phosphonate-based scale inhibitors present at low concentrations in water using surface-enhanced Raman spectroscopy (SERS). The substrates also are used in detergent and dispersant products, in corrosion inhibitors and in water treatment systems in general, such as cooling water and boiler water, in addition to being applied in other fields such as the textile, concrete and paper industries.

A quantitative analysis method for internal and external loading capacities of carbon nanotubes. The method comprises the following steps: (1) placing, in a tubular furnace, carbon nanotubes loaded with metal catalyst particles, and vacuumizing same; (2) performing annealing and capping; (3) calcining same, then placing same in a reaction kettle, adding dilute sulfuric acid, and heating same while stirring to obtain a sulfuric acid metal salt solution and capped carbon nanotubes in which metal catalyst particles are loaded; (4) measuring the loading capacity of nickel in the carbon nanotubes by means of IPC-MS technology; and (5) measuring the content of metal ions in the sulfuric acid metal salt solution by means of an EDTA coupling method. Capping the carbon nanotubes in advance before detection prevents metal nano particles loaded in the tubes from leaking, provides prerequisites for subsequent respective detection of the loading capacities in the tubes and on the outer walls, and also improves the detection precision of the internal and external loading capacities of carbon nanotubes. Moreover, the progress rate and extent of the capping reaction are regulated and controlled by adjusting the annealing temperature and rate, thereby achieving a better capping effect.

The invention relates to the field of lithium battery negative electrode materials, in particular to a silicon-based compound negative electrode material and a preparation method thereof.The negative electrode material comprises a compound of a silicon-based material and niobium-based composite oxide and metal nanoparticles loaded on the compound, the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide, and the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide. The negative electrode material is relatively good in conductivity, the conductivity and the lithium intercalation potential of the silicon-based composite negative electrode material are improved, the silicon-based material is prevented from generating side reaction with a solid electrolyte of a solid-state battery under low potential, meanwhile, the volume expansion of the silicon-based material in the charging and discharging process is relieved, and the comprehensive performance of the silicon-based solid-state battery is effectively improved.

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 discloses a microbial electrochemical efficient preparation method and application of metal nanoparticles, the metal nanoparticles are prepared and synthesized by regulating the redox metabolism behavior of microorganisms through positive / negative constant potential, and the microorganisms are electroactive microorganisms domesticated and cultured by activated sludge or single bacteria; the metal nanoparticles are in a solid state of a metal simple substance, are formed on the surface of an electroactive biological membrane, and are generated by electroactive microorganisms through extracellular electron transfer dissolved-state metal salt reduction. The palladium or silver and other metal nanoparticles prepared by the method are uniformly distributed on the surface of the electroactive biological membrane, the particle size is 1-10nm, the electroactive biological membrane-metal nanoparticle complex has extremely strong reducibility, and the electroactive biological membrane-metal nanoparticle complex is used for treating a non-biodegradable organic pollutant (4-chlorophenol), so that compared with a non-electroactive biological membrane and a treatment group without metal ions, the electroactive biological membrane-metal nanoparticle complex has the advantages that the biodegradability is greatly improved; the degradation effect is the best.

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 discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The application discloses a bimetallic optical fiber SPR sensor based on silver core-gold shell nanoparticles, comprising: an optical fiber, the outer surface of which is provided with a sensing area; and the metal functional layer is arranged on the sensing area, the metal functional layer comprises dispersedly stacked silver nanoparticles, and the outer surfaces of the silver nanoparticles are coated with gold films. The metal functional layer of the sensor is composed of the metal nanoparticles, and compared with a traditional metal film SPR sensor, the specific surface area and porosity of metal are remarkably improved, and the detection sensitivity of the SPR sensor can be improved; silver nanoparticles are adopted as a main metal material, SPR sensing is greatly promoted, the silver nanoparticles are coated with a gold film to form isolated bimetal nanoparticles, the chemical stability of the silver nanoparticles is improved, the sensor is endowed with common characteristics of gold and silver, and the detection performance is remarkably improved.

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.

The invention relates to the technical field of electro-catalysis, in particular to a modified iron monatomic catalyst based on biomass carbon as well as a preparation method and application of the modified iron monatomic catalyst. The preparation method comprises the following steps: mixing and stirring chitosan, an acetic acid solution, thiourea and ferric chloride, adjusting the pH value to 7.5-8.5, and freeze-drying to obtain an aerogel precursor; pre-carbonizing the aerogel precursor to obtain a pre-carbonized product; mixing the pre-carbonized product with an alkali reagent, and calcining to obtain a metal nanoparticle doped monatomic catalyst; and carrying out ultrasonic treatment on the metal nanoparticle doped monatomic catalyst by using a mixed acid solution, washing to be neutral, and drying to obtain the modified iron monatomic catalyst. By adopting the modified iron monatomic catalyst provided by the invention, non-polar CO2 molecules and NO3 <-> are efficiently converted into urea under mild conditions, the yield of the urea is up to 2978.6 mu g h <-1 > mgcat <-1 >, and the maximum Faraday efficiency is up to 30.4%.

The invention relates to the technical field of polishing and grinding, and discloses a polishing disc and a preparation method and application thereof. The polishing disc comprises a hot melting material layer and metal nanoparticles embedded in the hot melting material layer, the metal nanoparticles are evenly distributed on the polishing face of the polishing disc, and parts of the metal nanoparticles are exposed on the polishing face. According to the polishing disc, abrasive particles do not need to be added in the polishing process, the surface of a to-be-polished component cannot be damaged, and polishing of sub-angstrom-level surface roughness can be achieved.

The embodiment of the invention relates to the technical field of nanofluid preparation, in particular to a nanofluid preparation method which is used for mixing metal nanoparticles and alkali metal to form nanofluid and comprises the steps that S1, the metal nanoparticles are coated with solid alkali metal so as to form an integrated piece with the solid alkali metal; s2, adding the integrated piece into liquid alkali metal; and S3, uniformly mixing the integrated piece with liquid alkali metal to form the nanofluid. According to the embodiment of the invention, the nanoparticles are coated with the solid alkali metal to form the integrated piece, and then the integrated piece is added into the liquid alkali metal, so that the metal nanoparticles can be prevented from being adsorbed on the inner wall of a container or a pipeline, and the situation that the ratio of the metal nanoparticles to the alkali metal is not accurate can be avoided.

The invention provides a method for preparing a flexible circuit through ultrafast laser sintering of metal nanoparticles, and the method comprises the following steps: S1, coating the surface of a flexible substrate with metal nanoparticle slurry, and drying the metal nanoparticle slurry to form a metal nanoparticle layer; s2, the flexible base material is preheated through a preheating device; s3, pulse laser generated by the ultrafast laser light source is focused on the surface of the metal nanoparticle layer, and a metal nanoparticle sintering area is formed through sintering; and S4, preparing a patterned flexible circuit. The metal nanoparticles are preheated and softened, so that the deformation resistance of the metal nanoparticles is reduced; low-temperature sintering of metal nanoparticles on the flexible substrate and preparation of a flexible circuit are realized through a thermal-mechanical composite effect introduced by ultrafast laser, the nanoparticles are fully coalesced, the conductivity of a conductive region is high, and the selection range of a flexible substrate material is wide; by introducing the bonding layer into the flexible substrate, the conductive area is semi-embedded into the substrate, and the mechanical deformation durability of the flexible circuit is good.

The invention relates to a durable light-color antistatic master batch, a fiber and a preparation method thereof. The durable light-color antistatic master batch comprises the following components in parts by mass: 1-20 parts of a macromolecular antistatic agent, 0-10 parts of metal nanoparticles, 3-5 parts of a dispersing accelerator, 0.3-0.5 part of a silane coupling agent and 70-90 parts of a polymer matrix. The modified metal nanoparticles are effectively and uniformly mixed with a macromolecular antistatic agent consisting of polyether and polyamide chain segments, so that an excellent synergistic effect can be achieved in a polymer matrix, and a complete effective conductive path is formed. The composite material can effectively form a complete conductive network under the condition of low addition amount, and the antistatic performance of the composite material is greatly improved. In addition, as the metal nanoparticles account for a small proportion of the whole antistatic fiber, the antistatic fiber is light in color, and dyeing and later processing and manufacturing are facilitated.

A proton exchange membrane electrolytic cell membrane electrode structure with non-uniform load distribution under an anode catalyst layer rib and a flow channel area is characterized in that different load catalysts are sprayed on the area under the anode catalyst layer rib and the flow channel area of a membrane electrode in different areas, so that the whole catalyst layer is in non-uniform load distribution to improve the reaction performance of the membrane electrode; and gradient distribution of the catalyst is formed to improve membrane electrode performance. The thought of non-uniform load distribution of the under-rib area and the runner area of the membrane electrode catalyst layer designed by the invention not only can be used for preparing the membrane electrode of a proton exchange membrane electrolytic tank, but also can be used in the fields of the catalyst layer of a proton exchange membrane fuel cell and the like in which metal nanoparticles are deposited on the two sides of the membrane to improve the reaction performance and the like.

The invention discloses a longitudinally conductive basalt fiber composite material and a preparation method thereof, and belongs to the technical field of fiber reinforced composite materials, and the preparation method comprises the following steps: treating a desized basalt fiber plain weave fabric in a high-temperature and high-pressure water environment to obtain a hydroxylated basalt fiber plain weave fabric; dispersing the metal nanoparticles in a tannic acid solution to obtain tannic acid modified metal nanoparticles; depositing the tannic acid modified metal nanoparticles on the surface of the hydroxylated basalt fiber plain weave fabric to obtain a metal nanoparticle modified basalt fiber plain weave fabric; dispersing the conductive filler, blending with polycarbonate, and performing hot pressing to prepare a composite sheet; laying, hot-pressing and annealing the metal nanoparticle modified basalt fiber plain weave fabric and the composite sheet to prepare the basalt fiber composite material; by modifying the basalt fiber plain weave fabric, the interface bonding between the basalt fiber plain weave fabric and the matrix is increased, and the conductive composite sheet is introduced, so that the longitudinal conductivity of the basalt fiber composite material is improved.

The invention relates to the field of polyolefin catalytic aromatization, and discloses a low-temperature polyolefin aromatization method based on a zeolite-encapsulated metal catalyst, which comprises the following steps: heating and melting a zeolite-encapsulated metal catalyst as a lower bed layer and a mixture of polyolefin plastic and a lamellar ZSM-5 molecular sieve as an upper bed layer to carry out aromatization reaction; the zeolite encapsulated metal catalyst comprises a matrix and metal encapsulated in the matrix, and the matrix is an HZSM-5 molecular sieve. By designing a double-bed series catalytic route, polyolefin is firstly converted into low-carbon olefin, and then olefin aromatization reaction is performed, so that the reaction temperature and the content of heavy aromatic hydrocarbon are reduced; according to the catalyst for catalyzing the olefin aromatization reaction in the lower bed layer, the metal nanoparticles are encapsulated in zeolite crystals, the pore channel confinement effect is exerted to avoid generation of a large-size carbon deposition precursor, the diffusion speed of reactants and product molecules is adjusted to inhibit a deep reaction, a stable catalytic system is formed, and the catalytic activity of the catalyst is improved. The aromatic hydrocarbon yield and the service life of the catalyst can be improved.

The invention discloses an SERS (Surface Enhanced Raman Scattering) substrate for solution in-situ rapid detection as well as preparation and application thereof, and belongs to the technical field of substance detection. Comprising a substrate, a nanorod array film growing on the substrate, and metal nanoparticles deposited on the outer side surfaces of nanorods. The sensor has the advantages of portability of a solid substrate, strong plasmon resonance absorption in a broadband visible light region, strong surface enhancement effect and the like, and trace substances and microorganisms in a solution can be rapidly detected through the surface enhancement Raman effect; when substances in a solution are tested, pretreatment such as mixing, adsorption and drying is not needed, the limitation that in-situ detection of a traditional surface enhanced Raman base in the solution cannot be achieved is broken through, pretreatment-free in-situ and second-level ultrafast detection can be achieved, operation is easy, cost is low, and sensitivity is high. The problems that an existing SERS substrate is poor in stability and repeatability, and in-situ, ultrafast, trace and portable detection of substances in a solution cannot be achieved are solved.

The invention provides a silicon oxide loaded platinum-based high-entropy intermetallic compound catalyst for a propane catalytic dehydrogenation reaction. The catalyst is composed of a silicon oxide carrier and active metal nanoparticles loaded on silicon oxide. The preparation method of the catalyst comprises the following steps: fully drying a silicon oxide material to obtain a catalyst carrier; then, soluble metal salt is used as a precursor, and the heterogeneous catalyst is obtained through equivalent-volume impregnation, drying and reduction. A PtSn intermetallic compound is used as a substrate, the high-entropy intermetallic compound catalyst is prepared through a multi-metal doping strategy, the stability of the catalyst is greatly improved through a high-entropy structure, the electronic state of Pt can be adjusted through introduction of rare earth metal, desorption of propylene is promoted, the particle size of active components is reduced, and the catalytic activity of the catalyst is improved. The conversion rate and the stability of the catalyst are obviously improved. The catalyst shows good catalytic activity and selectivity at high temperature, shows excellent stability, and provides a novel high-activity and high-stability catalytic system for propylene preparation through propane dehydrogenation.