107 results about "Ag nanoparticles" patented technology

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and particularly relates to an Ag-MoO2 composite SERS substrate as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing Ag nanoparticles which are uniformly distributed and have the same size by a sodium citrate reduction method; secondly, a MoO2 material is prepared through a hydrothermal method; and finally, the novel SERS substrate Ag-MoO2 is prepared through a physical stirring method. According to the invention, the novel SERS substrate made of Ag nanoparticles and MoO2 materials is constructed, which is different from the conventional SERS substrate made of independent Ag nanoparticles, and can detect stronger intrinsic Raman signals of probe molecules. As the SERS substrate needs to be compounded with a MoO2 material during preparation, a charge transfer phenomenon can occur at an interface where the SERS substrate is in contact with probe molecules, so that intrinsic Raman signals of the probe molecules can be enhanced, and the SERS substrate can be better used for detecting and analyzing chemical substances.

The invention relates to the technical field of catalysts, in particular to a plasma silver nanocluster coated mesoporous molecular sieve TS-1 photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1, synthesizing mesoporous molecular sieve TS-1 powder; and 2, mixing the mesoporous molecular sieve TS-1 and CH3OH to prepare a suspension, injecting an AgNO3 aqueous solution into the suspension, and carrying out ultraviolet irradiation, filtration, washing and freeze drying to obtain the plasma silver nanocluster coated mesoporous molecular sieve TS-1 photocatalyst. The obtained electron-rich Ag cluster / mTS-1 shows an Ag-Ag coordination number (CN = 2.0 + / -0.1) lower than that of a mesoporous molecular sieve TS-1 (CN = 2.9 + / -0.2) loaded with Ag nanoparticles, so that the electron-rich Ag cluster / mTS-1 has higher CO2 adsorption and activation performance. In addition, the silver nanoclusters are firmly anchored on the surface of the mesoporous molecular sieve TS-1, so that the mesoporous molecular sieve TS-1 has high stability, and therefore, the mesoporous molecular sieve TS-1 shows high-stability CO2-to-CO photocatalytic conversion activity under simulated sunlight irradiation, and the yield of CO within 4 hours is 350 [mu] mol g <-1 >.

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.

The present invention provides a piezoelectric nanogenerator based on coaxial heterostructured composite piezoelectric fibers, a preparation method, and a wireless sensing system. This preparation method involves coating the surface of BT with a layer of Ag nanoparticles, spinning the fibers using a coaxial needle, and finally producing a PENG (Peng). This method increases the effective polarization voltage of the piezoelectric particles during polarization and enhances stress transfer within the particles. This method exhibits high piezoelectric output performance, enabling the application of PENG in wireless sensing systems and scalable industrial applications.

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 present invention is a preparation method and application of N-Carbon@Ag-void@SiO2 egg yolk-eggshell structure nanocatalyst. The method first prepares 3-aminophenol formaldehyde resin microspheres@SiO2 core-shell structure nanoparticles, and then, the Ag in the medium + Through the SiO2 shell, it contacts with the amino groups on the surface of 3-APF and converts Ag into + The Ag nanoparticles are then in situ reduced to Ag nanoparticles and fixed to the 3-APF surface. Finally, the Ag-loaded 3-APF@Ag@SiO2 core-shell nanoparticles are carbonized. Due to the coordination between the Ag nanoparticles and the nitrogen atoms on the core, the Ag nanoparticles migrate as the core shrinks during carbonization, ultimately forming the N-Carbon@Ag-void@SiO2 yolk-eggshell nanocatalyst. This method eliminates the complex template removal process, resulting in a simple, low-cost method suitable for large-scale preparation.

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.

A preparation method for a personal thermal management fabric with a temperature visualization function comprises the following steps: wet spinning polyurethane doped with Ag nanoparticles to obtain silver-containing conductive fibers, annealing on a 160°C hot plate for 5-10 minutes, and then treating with oxygen plasma for 30 seconds; dispersing 0.1-0.3wt% of negatively charged thermochromic powder, 0.3-0.5wt% of aqueous polyurethane, and 0.05wt% of sodium lauryl sulfate in deionized water to prepare an electrophoretic solution; electrophoretically depositing the treated silver-containing conductive fibers with the electrophoretic solution to obtain thermochromic conductive fibers; and weaving the thermochromic conductive fibers through a textile weaving process to obtain a personal thermal management fabric with a temperature visualization function. The fabric of the present invention achieves a dynamic thermal management effect, that is, in a hot environment, it can achieve a cooling effect 2.5K lower than that of ordinary white fabrics. In a cold environment, by combining Joule heat and photothermal effects, it can achieve more energy savings while providing the same heating effect.

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 present invention discloses a preparation method of hydrogen-producing liposomes, hydrogen-producing liposomes, and their applications in hydrogen-producing, anti-inflammatory, and anti-hair loss products. The method of the present invention prepares stable and dense liposomes through a simple hydration method, with a reaction time of only 15 minutes and a required temperature of only 45-50 °C. The synthesized liposomes have good dispersibility, strong stability, and good encapsulation. The preparation method has a simple process, mild reaction conditions, short reaction time, low energy consumption, and can achieve large-scale production. In the subsequent reaction of encapsulating antioxidants and Au / Pt / Ag NPs, the synthesized liposomes are mixed with the encapsulant and sonicated in an ice bath to obtain a hydrogen-producing system with completed assembly. The reaction conditions are simple, fast, and have a high success rate, thus opening up new opportunities for hydrogen-producing systems based on Au, Pt, and Ag nanoparticles in the fields of biomedical and cosmetic anti-inflammatory and anti-aging.

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 relates to the field of wastewater treatment, and provides a reusable SERS (Surface Enhanced Raman Scattering) substrate of Ag / Ag3PO4 / MXene, a preparation method of the SERS substrate and application of the SERS substrate in degradation / detection of crystal violet, and the SERS substrate can be used as a surface enhanced Raman scattering substrate for efficiently detecting organic dyes and has the capability of photocatalytic degradation of organic pollutants. And through the synergistic effect of Ag3PO4 and MXene, the SERS signal of the Ag nanoparticles is obviously improved, and the detection sensitivity to the dye is enhanced. The composite material shows excellent performance in the aspect of photocatalytic degradation, the absorption of visible light is remarkably improved through the Ag nanoparticle plasmon resonance effect, separation and transmission of photo-generated charge carriers are promoted, and the photocatalytic degradation efficiency is improved. As an SERS (Surface Enhanced Raman Scattering) sensor, the detection limit on dye crystal violet is 3.82 * 10 <-11 > M, and the SERS sensor has relatively high sensitivity; the CV degradation rate of the composite material is 83.64% within 90 minutes, and the composite material has good reusability.

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 invention discloses a silver-ammonia complex carbonization-reduction silver-loaded diatom-based composite material and its preparation and application. In the preparation process of the material, triaminopropyltriethoxysilane (APTES) is used as a silicon source required for diatom growth, amino functional groups are introduced into the diatom shells, silver ions are added for complexation, and finally carbonization and reduction are performed to obtain a silver-loaded diatom shell material. The diatom shell material is prepared as a lithium-ion battery negative electrode material. The uniformly loaded Ag nanoparticles greatly improve the conductivity of the diatom biosilica, thereby obtaining a lithium-ion battery negative electrode material with excellent electrochemical properties. The invention has the advantages of being simple, efficient, green and low-consumption, and provides theoretical guidance for the development and utilization of silica negative electrode materials.

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 present invention relates to an Ag / Cr x ‑NiFe 1‑x OOH / NF electrolysis seawater oxygen evolution catalyst and its preparation method and application, the present invention is to in situ construct Cr on the nickel foam substrate by mixing a solution containing a divalent nickel source, a trivalent iron source, a trivalent chromium source, urea and an alkaline solution. x ‑NiFe 1‑x OOH / NF, and using spontaneous redox reaction to load silver nanoparticles on its surface, a Ag / Cr with excellent chlorine corrosion resistance was obtained. x ‑NiFe 1‑x OOH / NF. By precisely controlling the ratio of Cr to Fe, the present invention achieves a delicate balance between order and disorder in the crystal structure of the material, achieving controllable growth of nanosheets within a thickness range of 25-1 nm and controllable adjustment of the nanosheet morphology. At the same time, Ag nanoparticles and CrO₄²⁻ anion groups generated in situ under high potential synergistically construct a barrier against chloride ion corrosion, forming a "surface Ag-Cl fixed + interlayer CrO4 2‑ -Dual anti-Cl2 with "shielding effect" – Corrosion structure, significantly improving corrosion resistance and catalytic activity, also has high selectivity and high stability, and can be used for electrolysis of alkaline water or seawater for oxygen evolution.

The invention relates to the technical field of masks, and particularly discloses a self-cleaning sterilization anti-virus non-woven fabric for a mask and a protective mask. The mask body is composed of an outer protective layer and an inner skin-friendly layer, and the outer protective layer is made of self-cleaning sterilization anti-virus non-woven fabric. The inner skin-friendly layer is formed by respectively taking composite polypropylene non-woven fabrics as an upper layer and a lower layer, and taking slow-release blasting beads as a middle layer to be arranged between the upper layer and the lower layer. The composite sterilization material is a metal organic framework material loaded with Ag nanoparticles; the non-woven fabric is a non-woven fabric which is formed by PP and PET through composite spinning and is of a skin-core structure. The composite polypropylene non-woven fabric is prepared by blending polypropylene, polyester, wormwood stems and natural bamboo fibers. The protective mask can specifically and efficiently kill common bacteria and viruses, the killing rate reaches 99.99%, and effective protection on personnel is achieved.

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 present invention belongs to the technical field of composite materials, and particularly relates to an Ag@BN / PVDF composite film, a preparation method thereof and an application. Through the induction of Ag nanoparticles, the content of polar crystal forms of the PVDF matrix in the Ag@BN / PVDF composite film is effectively increased; in the Ag@BN hybrid filler, the Ag nanoparticles are uniformly loaded on the surface of BN nanosheets, and the Ag@BN tends to be arranged in parallel and separated from each other in the PVDF matrix, thereby avoiding the excessive agglomeration of Ag nanoparticles and enabling the Ag@BN hybrid filler to form a large number of micro-capacitor structures in the PVDF matrix, thus effectively increasing the dielectric constant of the obtained composite material and maintaining a low conductivity and dielectric loss factor; the Ag@BN hybrid filler can also effectively increase the thermal conductivity of the obtained composite material.

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.