73 results about "Ag nanoparticles" patented technology

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and relates to a preparation method of an Ag-Fe3O4 composite SERS substrate and application of the Ag-Fe3O4 composite SERS substrate in monitoring trace pollutants in water. Based on a plasma-semiconductor synergistic enhancement mechanism, cubic Fe3O4 nano particles with exposed {100} crystal faces are synthesized through a hydrothermal method, and the cubic Fe3O4 nano particles and Ag nano particles are subjected to ultrasonic-stirring to construct the Schottky heterojunction. The substrate creatively realizes dual-channel enhancement: the local surface plasmon resonance effect of Ag nanoparticles generates electromagnetic enhancement, the narrow band gap of Fe3O4 promotes photo-induced electrons to be transferred to Ag, an interface electric field is formed, and the polarizability of adsorption molecules is remarkably increased. When the probe is applied to detection of trace pollutants in a water body, the probe molecule RB is anchored on the surface of Fe3O4 through carboxyl, and the HOMO energy level of the probe molecule RB and the valence band top of Fe3O4 generate resonance charge transfer, so that the Raman cross section is improved. The detection limit of RB under 0.25 mW laser is increased by several orders of magnitude compared with that of a single Ag substrate.

The application belongs to the technical field of food safety detection, and specifically discloses a method for detecting BaP in edible oil by using CTAB modified silver nanomaterial based on LLE-SERS, which comprises the following steps: preparing Ag nanoparticle sol, preparing CTAB functionalized Ag nanoparticle sol, SERS detection of BaP standard aqueous solution with different concentrations, fitting a standard curve, extracting BaP and performing SERS detection. The synthetic raw materials of the surface CTAB functionalized Ag nanoparticles used in the application are simple, and the coverage degree of the ligand molecules CTAB on the surface of the Ag nanoparticles can be controlled and adjusted. The CTAB as the surface ligand can directly capture and enrich BaP molecules. The detection method is high in stability, and can effectively avoid the problem that different batches of samples produce different effects in the Raman test.

The invention discloses a proton solid oxide and a preparation method and application thereof, and the proton solid oxide comprises a trigonal system ABO3 type La < 0.9 > Ba < 0.1 > Co < 0.7 > Ni < 0.2 > Ag < 0.1 > O < 3-delta >, a Ruddlesden-Popper type La < 0.9 > Ba < 0.1 > Co < 0.7 > Ni < 0.2 > Ag < 0.1 > O < 3-delta > and Ag nanoparticles. The proton solid oxide provided by the invention realizes a multi-phase coexistence structure, thermogravimetric analysis shows that the proton solid oxide meets the requirements of high catalytic activity and ion / electron transfer capability, and the structure not only improves the catalytic activity of the material, but also enhances the mechanical stability and thermal expansion resistance of the material, so that the proton solid oxide can be used for preparing a composite material. And the problems of unstable catalytic activity and high-temperature structure degradation caused by additional introduction of Ni-containing substances are avoided.

The application discloses an in-situ testing method for an electron transmission mechanism of an oxygen vacancy modified SrTiO3@Ag nanotube photocatalyst, and belongs to the technical field of energy materials. The method steps are as follows: first, SrTiO3 nanotubes are prepared by an in-situ electrospinning method; a SrTiO3@Ag nanotube is prepared by using a photoreduction method to anchor Ag nanoparticles near oxygen vacancies to construct a Schottky heterojunction. The electron absorption characteristics of the oxygen vacancies and the Ag nanoparticles provide a driving force for the transfer of photo-generated electrons, and the synergistic effect of the oxygen vacancies and the Ag nanoparticles greatly promotes the separation of photo-generated carriers. Subsequently, the migration direction of the photo-generated carriers in the system is characterized by in-situ irradiation XPS technology. By using the in-situ testing method, it is proved that the oxygen vacancies can serve as a "bridge" to transfer the photo-generated electrons activated by the SrTiO3 nanotubes to the active site Ag nanoparticles for a photocatalytic reduction reaction, and the electron transmission mechanism under the catalytic reaction condition is revealed. The method can provide a more convenient, more scientific and more actual scene conforming research mode for the research on the electron transmission mechanism of a photocatalyst with vacancies.

Electrochemical CO2 upgrading into C2 oxygenates is achieved a membrane electrode assembly (MEA) cell comprising metal plates, an anion exchange membrane (AEM), a cathode and anode, wherein the cathode comprises nanoscale Cu and Ag nanoparticles on a hydrophobic carbon substrate, wherein CO2 is fed to the cathodic side and converted to C2 oxygenates at the electrocatalyst surface.

The invention discloses Cu / CuO / Ag nano-particles and a preparation method and application thereof, and the method successfully prepares the Cu / CuO / Ag nano-particles with regular morphology and uniform dispersion by optimizing a dual-stabilizer system and a step-by-step reduction-replacement process. The material has dual functions of SERS enhancement and catalysis: as an SERS substrate, the enhancement factor of rhodamine 6G reaches 5.3 * 10 < 8 >, the detection limit is as low as 5.0 * 10 <-13 > mol / L, and the reproducibility is good (RSD = 6.2%); meanwhile, as a catalyst for hydrazinolysis and reduction reaction, by optimizing a reaction solvent and the pH value of a system, the reaction efficiency is remarkably improved, and an additional incubation step is not needed. The detection limit on the plasticizer DOTP can reach 2.0 * 10 <-9 > mol / L, and the method has the advantages of simplicity and convenience in operation, good reproducibility, high analysis speed and the like, and is suitable for rapid screening and quantitative analysis of plasticizers in food packaging, environmental water bodies and medical instruments.

A kind of TiO2 core Ag satellite hybrid super nanostructure preparation and sisomicin SERS detection application, it is related to the field of analysis and detection, first TiO2 microsphere surface modification, by electrostatic adsorption Ag nanoparticles, synthesis a kind of TiO2 core Ag satellite hybrid super nanostructure, can be used as SERS substrate detection sisomicin, by charge transfer mechanism between core and satellite, greatly improve the detection sensitivity of sisomicin.Under the optimal experimental conditions, the linear detection range of sisomicin is 10 ‑5 ~10 ‑11 M, the detection limit is 7.12× 10 ‑12 M, the relative standard deviation of SERS intensity is less than 10%;The method is simple, accurate and high sensitivity, without complex operation technology, meet the requirements of large quantities and rapid analysis and detection.

The application discloses an ultrafiltration membrane for sewage treatment and a preparation method thereof, and relates to the field of membrane separation technology. The method comprises the following steps: firstly, ZnO@PHEMA-Ag nanoparticles are prepared, and the nanoparticles are pretreated, modified, grafted and loaded with silver nanoclusters; then, maleic anhydride grafted PVDF and modified MXene are prepared; then, a composite casting solution is prepared, and the solution is cast into a film and then immersed into a polyvinyl alcohol coagulation bath containing dimethylformamide to form a film; finally, the finished ultrafiltration membrane is obtained through ultraviolet crosslinking post-processing. The ultrafiltration membrane has excellent anti-pollution performance through functional nanoparticles, substrate modification and process optimization.

The invention relates to a preparation method of a mould-corrosion-resistant ABS electromagnetic protective coating in a humid environment. The preparation method is characterized by comprising the following steps: pretreatment of an ABS matrix, preparation of an electromagnetic shielding layer, preparation of a mould-corrosion-resistant layer and preparation of a hydrophobic layer. In the ABS substrate pretreatment, a diamond free abrasive mechanical polishing method is adopted to remove an oxide layer not exceeding 10 microns on the surface, in the electromagnetic shielding layer preparation, a compact Cu-plated layer is reduced on the surface of the substrate by using an Ag nanoparticle-doped chemical copper plating process, and in the mold corrosion resistant layer preparation, a compact Ni-plated layer is prepared by using a nickel electroplating process on the surface of the electromagnetic shielding layer. And the hydrophobic layer is prepared by injecting a graphene oxide-doped polyurethane layer on the surface of the mould corrosion resistant layer through an injection molding process. According to the invention, 80-100 dB attenuation of broadband (1-18 GHz) electromagnetic waves is realized through the 10-13 [mu] m ultrathin composite coating, the growth of aspergillus niger, aspergillus flavus and other moulds can be inhibited, and the application prospect is wide.

The application provides a Z-type heterojunction Ag3PO4 / Ag / Bi4Ti3O 12 The application discloses a method for detecting H2S by using light-induced-thermal catalysis-chemiluminescence of nanomaterials. A 365 nm LED lamp is used to irradiate the sensing material for 2 min, air carrier gas is used to pass H2S sample to the surface of the ceramic rod coated with the material to generate a catalytic oxidation reaction, and the generated luminescence signal is detected by a BPCL ultra-weak luminescence analyzer with a photomultiplier tube and output. The unique electron transport path of the Z-type heterojunction and the LSPR effect of Ag nanoparticles make the catalyst generate photo-generated electron-hole pairs under light excitation, and the thermal catalysis condition inhibits the recombination of the electron-hole pairs. The electron transfer capacity between the material and H2S is improved, the whole catalytic oxidation reaction process is promoted, and the CTL detection signal is improved. The constructed analysis method realizes the rapid detection of H2S with high sensitivity and high selectivity.

The invention is applicable to the technical field of nano material preparation, and provides a preparation method and application of a Mn < 2 + >-MoS2-Ag surface enhanced Raman spectrum substrate, the method comprises the following steps: synthesizing a Mn < 2 + >-doped MoS2 nano material through a hydrothermal method, and loading Ag nano particles on the surface of the Mn < 2 + >-doped MoS2 nano material by using an ultrasonic-assisted chemical reduction method to obtain the Mn < 2 + >-MoS2-Ag surface enhanced Raman spectrum substrate. The substrate combines a chemical enhancement effect brought by Mn < 2 + > doping and an electromagnetic enhancement effect provided by Ag nanoparticles to form a synergistic enhancement system. When being applied to SERS (Surface Enhanced Raman Scattering) detection of trace ofloxacin in a water environment, the sensor shows excellent sensitivity and specificity, and the detection limit can reach 10 <-11 > M. The method is simple in preparation process and mild in condition, the prepared substrate is good in stability and remarkable in enhancement effect, and an effective tool is provided for rapid and high-sensitivity detection of antibiotic pollutants in the environment.

The invention provides a nano-enzyme system based on an Ag-polydopamine nano-microsphere (at) MOF-74 structure as well as a preparation method and application of the nano-enzyme system, and belongs to the technical field of biological medicines. The nano-enzyme system takes a polydopamine microsphere as a core, and an MOF-74 shell layer grows on the surface of the polydopamine microsphere in situ to form a composite microsphere with a core-shell structure; and by utilizing the reduction property of polydopamine, Ag nanoparticles are reduced in situ and uniformly dispersed in the MOF-74 framework, so that the composite nano material with the enzyme-like activity and the photo-thermal function is constructed. The system shows excellent horse radish peroxidase-like activity, and can effectively promote electron transfer between hydrogen peroxide and a substrate and catalyze a chromogenic reaction. Meanwhile, the composite system has good photo-thermal conversion performance, shows a remarkable photo-thermal sterilization effect on gram-negative bacteria and gram-positive bacteria, and can effectively inhibit and destroy the formation of bacterial biofilms. An in-vitro antibacterial experiment result shows that the MOF-74-based nano enzyme system has relatively high antibacterial activity.

The invention discloses an ultrafiltration membrane for sewage treatment and a preparation method thereof, and relates to the technical field of membrane separation. The method comprises the following steps: firstly, preparing ZnO (at) PHEMA-Ag nanoparticles, and carrying out pretreatment, modification, grafting and loading of silver nanoclusters; then preparing maleic anhydride grafted PVDF (Polyvinylidene Fluoride) and modified MXene; preparing a composite membrane casting solution, scraping the membrane, and immersing the membrane into a polyvinyl alcohol coagulating bath containing dimethylformamide to form the membrane; and finally, performing ultraviolet crosslinking post-treatment to obtain the finished ultrafiltration membrane. The ultrafiltration membrane disclosed by the invention realizes excellent anti-pollution performance through functional nanoparticles, substrate modification and process optimization.

The application discloses a CNTs / Ag / AgNWS / SiO2 combined SERS substrate, which is formed by dropping a CNTs / Ag / AgNWS solution on a silica glass sheet and drying, wherein the mass percentage of each component in the CNTs / Ag / AgNWS solution is as follows: silver nanoparticles 26-60%, silver nanowires 30-55% and multi-walled carbon nanotubes 3-20%. The application successfully attaches Ag nanoparticles to multi-walled carbon nanotubes, and then makes silver nanowires staggered and superimposed on the multi-walled carbon nanotubes. The application adopts silver nanoparticles with strong electromagnetic enhancement capability, combines the silver nanoparticles with carbon nanotubes, and adds silver nanowires with different structural shapes, and further enhances the Raman signal by using the charge transfer of the semiconductor, so that the Raman signal can be greatly enhanced, and the detection limit can be improved, and a good effect can be obtained by using a simple structure.

Disclosed is a catalyst for producing a multicarbon product from CO2, comprising a copper (Cu) substrate having at least one silver copper (AgCu) single-atom alloy (SAA), and silver (Ag) nanoparticles (NPs) on the Cu substrate or on the AgCu SAA, wherein the AgCu SAA comprises at least one single Ag atom dispersed into a surface of the Cu substrate, and the Ag nanoparticles comprise Ag-Ag bonds between the Ag nanoparticles.

The invention discloses a windmill-shaped alpha-Fe2O3 / Ag nano hybrid material and a preparation method and application thereof in relieving plant salt stress, and the method comprises the following steps: mixing fusiform alpha-Fe2O3 prepared by a forced hydrolysis method with silver acetate, then carrying out ball milling treatment, and then carrying out a high-temperature calcination process to obtain the windmill-shaped alpha-Fe2O3 / Ag nano hybrid material. And the windmill-shaped alpha-Fe2O3 / Ag hybrid structure formed by assembling the fusiform alpha-Fe2O3 and the Ag nanoparticles is obtained. The nano hybrid material has high specific surface area, excellent dispersity and remarkable leaf surface adhesion performance, when the nano hybrid material is applied to plant cultivation, the material can effectively relieve growth inhibition caused by salt stress, can regulate and control plant hormone signals, terpene and carbohydrate metabolism, sulfur metabolism, protein homeostasis and the like, realizes multi-channel comprehensive regulation, and has a wide application prospect. Therefore, the plant stress resistance and quality are improved.

The invention provides an incubation-free composite SERS (Surface Enhanced Raman Scattering) substrate as well as a preparation method and application thereof. The preparation method comprises the following steps: providing Ag nanoparticles; providing a nano carbon material, and loading the Ag nanoparticles on the surface of the nano carbon material to form an SERS solution system with a composite nano structure; loading a cationic polyelectrolyte structure on the surface of the nanofiber membrane to obtain a composite fiber membrane; the SERS solution system is dripped onto the composite fiber membrane, and the incubation-free composite SERS substrate is obtained. The detection efficiency and sensitivity of the sulfonamide antibiotics can be remarkably improved, and the application prospect is wide.

The invention belongs to the field of lithium ion batteries, and relates to a silver salt modified polyacrylonitrile quasi-solid electrolyte, a preparation method thereof and a lithium ion battery. The quasi-solid polymer electrolyte comprises polyacrylonitrile, a lithium salt, a plastic crystal and a silver ion additive, based on the total weight of the quasi-solid electrolyte, the weight content of the polyacrylonitrile is 35-65%, the weight content of the lithium salt is 20-50%, the weight content of the plastic crystal is 3-35%, and the weight content of the silver ion additive is 0.01-10%. The strong oxidizing property of Ag < + > ions is utilized, a large number of Ag nano-particles can be formed on the surface of the Li negative electrode, the particles can serve as nucleation sites, uniform deposition of Li on the negative electrode side is induced, and improvement of the cycle performance of the solid-state battery is promoted. The quasi-solid electrolyte provided by the invention has higher conductivity and better cycle performance.

The invention belongs to the technical field of preparation of medical degradable metal-based composite materials, and relates to a biodegradable composite material and a preparation and application method thereof. The preparation method comprises the following steps: 1, taking graphene oxide, silver nitrate and ferric nitrate as raw materials, and enabling Ag and Fe2O3 nanoparticles to grow on the surface of the graphene oxide together in situ through a hydrothermal method, so as to form (Ag + Fe2O3) coated GO; 2, (Ag + Fe2O3) coated GO is uniformly dispersed in Zn powder through wet ball milling, and (Ag + Fe2O3) coated GO / Zn mixed powder is obtained; and 3, the mixed powder is subjected to sintering and plastic processing, and the ZnO-coated GO / Zn-Fe-Ag alloy-based composite material is prepared. And reinforcing the zinc matrix by using an in-situ alloying reaction between the Ag nanoparticles and the zinc matrix, and endowing the zinc matrix with an antibacterial characteristic, so as to finally obtain the biodegradable ZnO (at) GO / Zn-Fe-Ag biological composite material with good comprehensive performance.

This invention provides a method for preparing and applying a long-lasting photocatalytic antifouling coating material, belonging to the field of marine antifouling coating technology. This invention uses an improved wet chemical reduction method to prepare an Ag@CuGaO heterojunction photocatalytic antifouling agent. This material is a nanocubic structure of CuGaO modified with Ag nanoparticles, with a silver loading of 0.5~10wt%. It combines the small size effect of Ga doping with the surface plasmon properties of Ag, which can broaden the light absorption range and improve carrier separation efficiency. 1~5 parts by weight of this antifouling agent are compounded with 100 parts by weight of organosilicon resin, and an organosilicon antifouling coating is prepared after substrate pretreatment, ultrasonic dispersion, curing and degassing, and spin coating curing. The coating of this invention achieves integrated antifouling and antibacterial properties, with an immediate bactericidal rate of 99% against Staphylococcus aureus and Pseudomonas aeruginosa, and an antibacterial rate of >90% after 60 days in a simulated marine environment. It effectively solves the problems of photocorrosion, short antifouling cycle, and poor mechanical properties of traditional photocatalytic materials, and is suitable for preventing biofouling on metal surfaces of marine facilities. The process is green and economical.

The invention discloses a gold-silver-chromium nano composite material as well as a preparation method and application thereof. The Au-Ag-CrNCs synthesized by a simple and efficient method not only can be used for colorimetric sensing of multiple modes and multiple analytes, but also plays an important role in the field of advanced MIT. Au-Cr nano seeds are generated through a pre-reaction, and the nano seeds are mixed with Ag < + >, a stabilizer SDBS and a reducing agent AA, so that Au-Ag-Cr NCs coated with the SDBS is successfully prepared. The morphological characteristic of the Au-Ag-Cr NCs is Au / Ag nanoparticles attached to the branched chromium nanobelt. The Au-Ag-Cr NCs can selectively and quantitatively detect two analytes (Hg < 2 + > and ClO <->) by analyzing the multi-signal change of color, Tyndall effect and absorption. Furthermore, a basic logic gate and an advanced logic circuit can be constructed by using the different substances as inputs and the signal change of the generated solution as an output. Meanwhile, through binary conversion of multi-signal response, molecular information coding, encryption and steganography based on Au-Ag-CrNCs logic relation and selective response can be realized.

This invention belongs to the field of environmental pollution detection and treatment technology, specifically relating to a SiO2@Ag / ZnO flexible substrate and its application in the detection and degradation of malachite green. A SiO2@Ag nanocomposite material is prepared by modifying Ag nanoparticles onto the surface of SiO2 spheres. Further, ZnO is attached to the surface of SiO2@Ag to prepare the composite material SiO2@Ag / ZnO. A SiO2@Ag / ZnO flexible substrate was successfully prepared by attaching SiO2@Ag / ZnO to fabric. This material exhibits detection capability at lower concentrations and demonstrates stable response to concentration changes in SERS signal detection of malachite green, exhibiting high quantitative accuracy and suitability for SERS quantitative analysis. Simultaneously, this material achieves stable degradation of malachite green under light irradiation conditions; the degradation rate gradually increases with prolonged ultraviolet light irradiation time, reaching a maximum degradation rate of 91.1%.

This invention discloses an Ag / MnO2 alkaline oxygen evolution catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The catalyst preparation method includes: (1) dissolving manganese salt, silver salt, and anionic surfactant in a solvent and obtaining an Ag / MnO2 precursor via a hydrothermal reaction; (2) calcining the Ag / MnO2 precursor to obtain the Ag / MnO2 alkaline oxygen evolution catalyst. The catalyst of this invention is made from non-precious metal materials, with abundant and inexpensive raw material sources, which can reduce the production cost of the catalyst; in addition, the catalyst preparation method is simple to operate and easy to mass-produce. In this invention, Ag nanoparticles anchored on the MnO2 surface help increase the specific surface area of ​​the composite catalyst, which helps to expand the electrochemical reaction region, and it exhibits good OER catalytic activity and stability in alkaline electrolytes.

The invention discloses a joint replacement full-stage self-adaptive Ag-DLC coating and a preparation method thereof, the coating comprises a bio-friendly substrate, a titanium bonding layer and an Ag-element-doped Ag-DLC functional layer, the Ag element in the functional layer is embedded in a DLC carbon skeleton in the form of Ag nanoparticles, the size of the Ag nanoparticles is 1-35 nm, and the doping amount is 2-40 at.%. According to the invention, the DLC coating with the nanocrystalline / amorphous composite structure characteristic is constructed by doping the Ag element with the anti-bond characteristic, so that the synergism of functions such as mechanical bearing, abrasion resistance, antibacterial property and biocompatibility can be realized. By means of controllable release of the Ag nanoparticles, self-adaptive response of functional characteristics of the metal joint implant in the whole service stage can be achieved, the requirements of the coating on the antibacterial performance and biocompatibility in the early postoperative stage can be met, and reliable anti-abrasion protection and osteogenesis promoting functions can be provided for the stable postoperative service stage.

The application discloses a multi-component gradient three-dimensional zinc negative electrode induced by stack deposition and a preparation method and application thereof, relates to the field of electrochemical energy storage, and in-situ constructs a general strategy of multi-component gradient 3D host skeleton induced stack zinc deposition / detachment by combining a solution immersion method and a thermal evaporation technology: an amino-functionalized polysiloxane passivation layer distributed along a concentration gradient effectively inhibits zinc anode corrosion, and conductive zincophilic Ag nanoparticles distributed along a reverse concentration gradient guide zinc to uniformly nucleate and deposit at the bottom; the electric field distribution, zinc ion flux and deposition path of the electrode are optimized, dendrite-free, dense and high-load zinc deposition is realized; a symmetrical battery based on the gradient electrode can be stably cycled for more than 5000 hours under high current density / capacity, exhibits high coulombic efficiency and excellent long cycle stability; and a full battery prepared in cooperation with a manganese dioxide positive electrode has a capacity retention rate of 82.2% after 800 cycles.

The invention belongs to the technical field of carbon fiber surface modification, and discloses MoS2 nanosheet and Ag nanoparticle different-dimensional co-modified carbon fiber and a preparation method and application thereof, the preparation method comprises the following steps: desizing carbon fiber, and activating to obtain activated carbon fiber; growing MoS2 nanosheets on the surfaces of the activated carbon fibers; dipping the carbon fiber on which the MoS2 nanosheet grows in an AgNO3 solution, then adding ammonia water into the AgNO3 solution, then adding a glucose solution into the AgNO3 solution, and growing Ag nanoparticles in situ. The MoS2 nanosheet is used as a rigid stress transfer bridge to effectively transfer the load from the polyether-ether-ketone to the carbon fiber, so that the interfacial stress concentration is avoided. And the Ag nano-particles absorb fracture energy through plastic deformation, so that the effect of delaying crack propagation is achieved, and the interface bonding strength and the overall mechanical property of the composite material are improved.

The invention relates to the technical field of magnetic nano materials, in particular to a pigment coating capable of realizing full-color-gamut controllable self-discoloration and a preparation process of the pigment coating. Comprising a matrix layer, a functional layer and a magnetic control layer, and the functional layer comprises the following components in parts by weight: 100-300 parts of Fe3O4 coated SiO2 nanorods, 12-18 parts of nano-TiO2, 8-12 parts of Ag nanoparticles, 3-6 parts of titanium dioxide, 2-5 parts of a dispersing agent and 3-6 parts of a photoinitiator. By improving a pigment formula and a dispersion technology, the stability of the pigment in different environments is improved. By optimizing the nanostructure design, the view angle dependence is reduced, and the application prospects in the fields of automobiles, buildings and the like are improved. The problems that a traditional electrochromic technology is narrow in color gamut and high in energy consumption are solved.

This invention discloses an Ag-Bi 24 Br 10 O 31 This paper discusses the preparation and application of Bi₂O₂S heterojunction composite materials, belonging to the field of SERS detection technology. First, Bi₂O₂S heterojunction composite materials are prepared using a hydrothermal method. 24 Br 10 O 31 Nanosheets, then with Bi 24 Br 10 O 31 Bi2O2S was constructed by secondary hydrothermal in-situ growth of Bi2O2S on nanosheets as a substrate. 24 Br 10 O 31 A Bi₂O₂S heterostructure was formed, followed by chemical reduction to load Ag nanoparticles, and then dried to obtain the target composite SERS substrate. This material utilizes the localized surface plasmon effect of Ag to form a strong SERS "hot spot," exhibiting excellent Raman enhancement performance for crystal violet, enabling highly sensitive detection of crystal violet. This method is simple, uses readily available raw materials, and produces a material that combines excellent SERS enhancement performance with photocatalytic activity, showing broad application prospects in environmental monitoring and pollution control.

The invention provides a coating, a preparation method of the coating and a medical instrument, and the preparation method of the coating comprises the following steps: providing a base material, and forming a polydopamine layer on the surface of the base material; preparing a hydrogel solution of chitosan and sodium alginate, wherein the hydrogel solution contains Cu < 2 + > ions and Ag nanoparticles; enabling the polydopamine layer to be in contact with the hydrogel solution, and forming a hydrogel coating on the surface of the polydopamine layer; the coating has good anti-inflammatory and antibacterial effects, and can effectively play a role in promoting wound healing when being applied to medical apparatuses and instruments.

The purpose of the present invention is to provide a technology with which it is possible to increase the reliability of a bonding layer comprising a metal particle paste. The present invention provides a metal particle paste, wherein: the mass percentage of Ag nanoparticles with respect to total metal particles comprising Ag nanoparticles, Sn microparticles, and Ag microparticles is 50-70 wt%; the mass percentage of Sn microparticles with respect to the total metal particles is 10-20 wt%; and the mass percentage of Ag microparticles with respect to the total metal particles is a value obtained by subtracting the mass percentage of Ag nanoparticles and the mass percentage of Sn microparticles from 100 wt%.