48 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 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.

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.

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 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 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.

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.

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.

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.

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%.

The application discloses a kind of gold-silver composite carbon-supported catalysts based on oleylamine ligand and its preparation method and application, belong to the technical field of electrocatalytic carbon dioxide reduction, the gold-silver composite carbon-supported catalyst is by in-situ ligand control obtained dispersion type Au / C catalyst and hydrophobic type Ag nanoparticles mixed grinding obtained composite system.The catalyst surface of the application is modified with long-chain oleylamine Ag nanoparticles (20-60nm) uniformly distributed on Au / C (Au particle size <5nm).The hydrophobic Ag particles establish a hydrophobic layer inside the catalytic layer, and leave CO2 gas transmission channels, not easy to store liquid water, avoid water film completely covering catalyst layer to cause activity decline and voltage rapid growth.

The application discloses basalt fiber and PVDF composite material and a preparation method of Ag / Fe3O4 synergic modification, Ag nanoparticles and Fe3O4 nanoparticles are simultaneously modified on the basalt fiber, and the limitation of traditional single modification function is broken; and the modified basalt is used to prepare oriented PVDF composite material, so that the prepared PVDF composite material realizes synchronous improvement of piezoelectric performance and electromagnetic shielding performance, and can be directly used as a structural material of equipment shell, cabin, automobile and the like, realizes intelligent structure manufacturing of self-sensing and self-shielding, and has good application prospect and economic value as a new type of PVDF composite material product.

The invention relates to the field of semiconductor devices and neuromorphic calculation, in particular to a dual-structure memristor based on Ag nanoparticle modified MoS2 / HfO2 and a preparation method of the dual-structure memristor. The preparation process comprises the steps of sequentially depositing the Pt bottom electrode and the HfO2 resistive layer on the substrate, forming the Ag nanoparticle layer through thermal evaporation and annealing, then transferring the MoS2 thin film, and finally preparing the Au / Ag top electrode. The device can realize 19ns quick response and 283-order conductance state regulation and control in a vertical structure, and shows wide-spectrum light response capability in a planar structure by virtue of a local surface plasma resonance effect of Ag nanoparticles. The device has ultra-low power consumption, high switch ratio and multi-wavelength light sensing characteristics, can simulate various nerve synaptic behaviors and a light pulse learning function, is suitable for the fields of brain-like calculation, intelligent robots, multi-mode artificial intelligence systems and the like, and effectively realizes integrated fusion of sensing and calculation.

The invention discloses a silver-loaded and anion-interspersed layered catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, a hydrothermal method is adopted for growing oxalate ion-interspersed layered ferrocobalt bimetal hydroxide CoFe-C2O4 < 2->-LDH on foamed nickel, and then the layered ferrocobalt bimetal hydroxide CoFe-C2O4 < 2->-LDH is soaked in an aqueous solution of AgNO3; and reacting to generate the silver-loaded oxalate ion interspersed layered ferrocobalt double metal hydroxide Ag / CoFe-C2O4 < 2->-LDH. The silver-loaded and anion-interspersed layered hydroxide has excellent catalytic activity and stability in seawater electrolysis oxygen evolution reaction. Under the applied voltage, the Ag nanoparticles generate AgCl in situ in the seawater oxygen evolution process, chloride ions can be fixed, and the Ag nanoparticles and C2O4 < 2-> anion groups which are embedded into the CoFe layered double hydroxides and have high electronegativity cooperate to construct a chloride ion erosion resistant barrier, so that the chlorine corrosion resistance of the NiFe layered double hydroxides in seawater electrolysis is enhanced.

The invention discloses a preparation method of an Ag / P25 composite catalyst and application of the Ag / P25 composite catalyst in photocatalytic conversion of CH4 into CH3OH, and belongs to the technical field of CH4 photocatalytic conversion. The preparation method comprises the following steps: firstly, ultrasonically dispersing commercial P25 in an AgNO3 aqueous solution, then slowly dropwise adding a NaBH4 aqueous solution, continuously stirring for reaction after dropwise adding, and finally performing centrifugal separation, washing and drying after the reaction is completed. The Ag / P25 composite catalyst with Ag nanoparticles loaded on the surface and containing a large amount of Ov is prepared through a simple wet impregnation method, the performance of CH4 photocatalytic conversion into CH3OH is greatly improved, and the yield and selectivity of CH3OH within 2 h reach 5.5 mmol g <-1 > h <-1 > and 94% respectively under the conditions of the room temperature and the total pressure of CH4 + O2 (19: 1) of 2 MPa.

This invention discloses an anode material, its preparation method, and a battery, belonging to the technical field of battery anode materials. The anode material of this invention comprises a regularly grown array of LDH nanosheets on a substrate, LDH nanosheets containing vacancy defects, uniformly attached silver nanoparticles on the LDH nanosheets, and conjugated organic ligands inserted between the LDH nanosheet layers. The unique three-dimensional array composite porous structure of this invention effectively buffers the volume change of lithium metal during repeated charge-discharge processes. The loaded Ag nanoparticles increase the number of active sites and conductivity, while also guiding uniform lithium deposition to inhibit dendrite growth. The d-π conjugated structure formed by the conjugated organic ligands and the metal not only improves the overall conductivity of the material but also optimizes the electronic structure of the metal sites. Simultaneously, the strong coordination chelation effectively ensures the stability of the Ag nanoparticles during charge-discharge processes, inhibiting interlayer aggregation and effectively improving electrochemical performance.

The invention relates to a method for preparing a UiO-66-NH2 photocatalyst, and the method comprises the following steps: adding a reducing agent into a mixed solution containing UiO-66-NH2 and an Ag precursor, carrying out a reduction reaction to obtain a reaction product, and carrying out solid-liquid separation on the reaction product to obtain a solid-phase product. The method provided by the invention can effectively promote the adsorption of NO3 <->; compared with the prior art, the prepared UiO-66-NH2 can effectively promote separation and transfer of photogenerated charges and provide more active sites, so that the prepared UiO-66-NH2 has more excellent light absorption performance and higher photocurrent density, thereby effectively promoting rapid separation of electron-hole pairs and improving the transmission efficiency. The UiO-66-NH2 photocatalyst provided by the invention has higher photocatalytic efficiency and ammonia synthesis yield when being used for photocatalytic synthesis of ammonia, and the introduction of the Ag nanoparticles improves the energy barrier of the N-N coupling step, effectively avoids the generation of by-products such as N2 and N2O, and makes the ammonia selectivity close to 100%. In addition, the method provided by the invention is simple to operate, high in safety and easy for large-scale production.

The invention discloses humidity response type antibacterial and mildew-proof leather and a preparation method thereof. The method comprises the following steps: firstly, dissolving silver nitrate and quercetin to obtain QC-Ag nanoparticles; secondly, preparing polydopamine nano particles; then copper acetate is dispersed in an ethanol solution, PDA nano-particles are added, ultrasonic stirring and standing precipitation are carried out, precipitates are added into an ethanol solution of sodium hypophosphite, reflux condensation is carried out for 30 min at the temperature of 80 DEG C, and PDA-Cu nano-particles are obtained after alcohol and water alternate centrifugation and drying treatment are carried out. And finally, physically blending the obtained QC-Ag nano-particles and PDA-Cu nano-particles with a polyacrylate emulsion in proportion, and constructing the two nano-composite finishing agents on the surface of leather by adopting layer-by-layer self-assembly, brush coating or magnetron sputtering. The leather coating prepared by the method has a remarkable inhibition effect on growth of aspergillus niger, and particularly has good wet-sensing, antibacterial and mildew-proof properties when the environment humidity changes.

The application belongs to the technical field of SERS detection, and particularly relates to application of an Ag / Al-Bi2WO6 composite SERS substrate in detection of 4-MBA in industrial wastewater. Al-Bi2WO6 nanoparticles are prepared by a calcination method; Ag nanoparticles are grown on the surface of the Al-Bi2WO6 material by an in-situ reduction method, and Ag / Al-Bi2WO6 is obtained by drying, and the Ag / Al-Bi2WO6 composite SERS substrate is obtained by loading the Ag / Al-Bi2WO6 on a glass sheet. The application constructs an efficient interface charge transfer channel by integrating the local surface plasmon resonance effect of Ag nanoparticles and the charge separation capacity of Al-Bi2WO6, and enhances the Raman signal of 4-MBA molecules. The substrate has electromagnetic enhancement and chemical enhancement synergistic effect, and realizes high-sensitivity and specificity detection of trace 4-MBA.

The invention discloses a negative electrode material, a preparation method thereof and a battery, and belongs to the technical field of battery negative electrode materials. The negative electrode material disclosed by the invention comprises an LDHs nanosheet array regularly grown on a substrate, nano-silver particles uniformly attached to the LDHs nanosheets and a conjugated organic ligand inserted between LDHs nanosheet layers, wherein the LDHs nanosheets contain vacancy defects. A unique three-dimensional array composite porous structure effectively buffers the volume change of lithium metal in the repeated charging and discharging process, the number of active sites and the conductivity are increased through the loaded Ag nanoparticles, and meanwhile uniform deposition of lithium can be guided, so that dendritic crystal growth is inhibited; a d-pi conjugated structure formed by a conjugated organic ligand and metal not only improves the overall conductivity of the material, but also optimizes the electronic structure of a metal site, and meanwhile, the strong coordination chelation effectively ensures that the Ag nanoparticles are stable and do not fall off in the charging and discharging process, inhibits interlayer agglomeration and effectively improves the electrochemical performance.

The application relates to the technical field of water treatment, and discloses a preparation method of a composite material catalyst and application of the composite material catalyst. The preparation method of the composite material catalyst comprises the following steps: S1, ultrasonic treatment of rape pollen in anhydrous ethanol, soaking in a mixed solution of anhydrous ethanol and formalin, stirring in concentrated sulfuric acid, filtration, drying, and obtaining carbonized rape pollen; sealing and hydrothermal treatment of the carbonized rape pollen in a mixed solution of iron nitrate nonahydrate, sodium fluoride, a cationic surfactant and NaOH, calcining the material to obtain a thorn-like Fe2O3 / C material; configuring the thorn-like Fe2O3 / C into a mixed solution, stirring in polyethylene glycol solution, adding AgNO3, and performing photodeposition and drying to obtain a catalyst product. By introducing Ag nanoparticles, the cycle number of the material can be significantly improved, meanwhile, the Ag nanoparticles are anchored on the surface of the thorn-like Fe2O3, the specific surface area of the material is increased, more reaction active sites are provided, and therefore the photocatalytic performance of the material is improved.

This invention belongs to the field of SERS detection, specifically relating to a double-shell Ag-ZnAl2O4-MOF composite material, its preparation method, and its application in trace detection of organic pollutants. First, ZnAl2O4 nanoparticles are synthesized using a hydrothermal method. Then, the prepared ZnAl2O4 nanoparticles are placed into a prepared MOF growth solution to form a ZnAl2O4-MOF composite structure. Further composite with Ag nanoparticles is then formed to create the double-shell Ag-ZnAl2O4-MOF composite material. The Ag-ZnAl2O4-MOF composite substrate exhibits a synergistic effect of physical and electromagnetic reinforcement. Furthermore, due to the large specific surface area, porosity, and multiple metal sites of the intermediate MOF layer, more hot spots can be formed. The charge transfer effect generated by the composite with ZnAl2O4 produces an electromagnetic reinforcement effect. These characteristics effectively enhance the SERS signal intensity.