30results about How to "Enhanced Raman activity" patented technology

The invention discloses a preparation of a carbon-based dot-wrapped tin dioxide nanosheet composite material and its application in a surface-enhanced Raman substrate. Nanoparticles are mixed and ultrasonicated, using the ultra-thin structure of the single-layer carbon-based dots as an intercalation agent to peel off the tin dioxide nanoparticles into nanosheets, and using the abundant oxygen-containing functional groups on the surface of the single-layer carbon-based dots to combine with the two SnO nanosheets are combined to obtain SnO2 nanosheets wrapped by carbon-based dots. The preparation method of the present invention is simple and convenient, pollution-free and highly operable, and the obtained carbon-based dot-wrapped tin dioxide nanosheet composite material has good dispersibility and stability in water, and can be used for selective detection of certain environmental pollutants .

The invention relates to a preparation method of silver nano particle coated zinc oxide nano tube substrate. The preparation method adopts a combination of a chemical method and a magnetron sputtering method. The target product Ag@ZNT substrate is prepared from following raw materials: Zn(OOCCH3)2.2H2O, Zn(NO3)2.6H2O, KCl, absolute ethanol, hexamethylene tetramine, and silver target. The substrate has the advantages of very good Raman activity, stability and repeatability, is an ideal SERS substrate, and is capable of being applied to fields of chemistry, materials science, and biomedicine.

The invention discloses a surface enhanced Raman substrate material for detecting the water content of an organic solvent, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) modifying polyvinyl alcohol gel with a p-aminothiophenol derivative 4,4'-dimercaptoazobenzene as a probe molecule; (2) preparing PVA-DMAB microspheres with uniform particle sizes and smooth surfaces in a micro-reactor; and (3) loading nano-silver particles on the surfaces of the PVA-DMAB microspheres through in-situ growth in order to prepare the PVA-DMAB-Ag Ramansubstrate material. The preparation method is simple, and the prepared Raman probe can realize the rapid, quantitative and qualitative analysis of water in the organic solvent, has the advantages ofrepeated use and low detection sensitivity, and has a great application prospect in the field of analysis and detection of a micro or trace amount of water.

The invention discloses a large-area metal nano-structural substrate for surface-enhanced Raman and a preparation method thereof. The large-area metal nano-structural substrate for the surface-enhanced Raman consists of a nano-scale structural substrate consisting of different phase alloy materials and a nano-thickness metal material deposited on the substrate. The metal nano-structural substrateprovided by the invention has good Raman enhancing effect, and can be widely applied in the fields of physics, chemistry, materials science, biomedicine and the like. The preparation method for the large-area metal nano-structural substrate for the surface-enhanced Raman uses an alloy material consisting of different phases as a primary template, adopts a selective plasma etching method to etch the nano-structural substrate, and then adopts an ion beam sputtering method to deposit the nano-thickness metal material on the nano-structural substrate so as to form the surface-enhanced Raman substrate based on different phase metal materials; and the preparation method has mature industrial technology and low production cost, and can implement industrialized mass production.

The invention discloses a surface enhanced Raman substrate material for detecting nitrite and a preparation method thereof. The preparation method comprises the following specific steps: (1) synthesizing a gold nano-rod by a crystal seed method; (2) preparing a p-mercaptoaniline modified gold nano-rod material; (3) synthesizing a gold nano-sphere by a hydrothermal method; (4) preparing a 1-amino-8-metcaptonaphthalene modified gold nano-sphere composite material; (5) mixing the p-mercaptoaniline modified gold nano-rod material and nitrite to generate diazonium salt; (6) mixing the diazonium salt and the 1-amino-8-metcaptonaphthalene modified gold nano-sphere composite material to generate azo-dye; (7) indirectly carrying out qualitative and quantitative detection on the nitrite by utilizing a surface enhanced Raman spectrum signal of the azo-dye. The surface enhanced Raman substrate material disclosed by the invention has good surface enhanced Raman activity on a substrate and can be used for rapidly detecting the nitrite in the environment and food samples.

The invention belongs to the technical field of micro-nanometer materials and particularly relates to a method for preparing an Au modified Zn / ZnO micro-nanometer structure function material through the combination of electrochemical deposition and the substitution method. Two electrodes are arranged on a substrate silicon wafer in parallel, ZnSO4 electrolyte is dripped between the electrodes, a glass sheet covers the ZnSO4 electrolyte, the substrate silicon wafer is placed in an insulation room, an ice layer fully spread between the two electrodes is formed between the silicon wafer and the glass sheet by means of a TEC in the insulation room, the substrate silicon wafer is placed in the insulation room for another 30 minutes, then direct-current voltage of 0.8-1.4 V is added between the two electrodes for 30 minutes of deposition, the obtained product is cleaned through deionized water, aired and steeped into a chloroauric acid solution for 30 seconds and then is taken out, cleaned and aired, and therefore an Au modified Zn / ZnO micro-nanometer structure is obtained. According to the method, operation is simple, and the prepared product has high surface-enhanced Raman activity and can be used repeatedly.

The invention discloses a reduced graphene / ferroferric oxide / precious metal nanocomposite and a preparation method and application thereof. The preparation method comprises the specific steps that 1, polyethyleneimine and polyacrylic acid are used as polyelectrolytes, and a reduced graphene nano material supported by magnetic ferroferric oxide is prepared through a self-assembly method; 2, trimethoxysilylpropanethiol is added into the reduced graphene nano material supported by the magnetic ferroferric oxide, and a magnetic graphene material modified by the trimethoxysilylpropanethiol is obtained; 3, precious metal nano particles and the magnetic graphene material modified by the trimethoxysilylpropanethiol are mixed, and the reduced graphene / ferroferric oxide / precious metal nanocomposite is obtained. The obtained composite has the good surface-enhanced Raman activity and electrocatalytic activity, and can be widely applied to the fields of biosensing, electrocatalysis, surface-enhanced Raman detection and the like.

The invention belongs to the technical field of function materials, and specifically relates to a Raman strengthening active microsphere and a preparation method and an application thereof. The Raman strengthening active microsphere provided by the invention has a core-shell structure, the core of the Raman strengthening active microsphere is a melamine resin microsphere, and the shell is uniform and compact silver nanometer granules. The preparation method comprises the steps of firstly preparing uniform melamine-oxymethylene microsphere through fasculation, then utilizing a reducing agent to restore silver nitrate through a normal position chemical reduction method, and uniformly and compactly depositing the generated silver nanometer granules onto the surface of the melamine resin microsphere, so as to prepare the MF / Ag-NPs composite microsphere. The raman strengthening active microsphere utilizes a single microsphere as a raman strengthening base material, and is used for detecting Raman. The single Raman strengthening active base material microsphere provided by the invention has the characteristics of high stability and high Raman strengthening property. The method provided by the invention has the advantages that the operation is simple, the process is controllable, and the prepared composite microsphere can be used for analyzing and detecting organic contaminants such as pesticide residue of a single microsphere in a Raman manner.

The invention relates to a method for detecting residual organics on a fire scene based on a surface enhancing raman spectrum. The method comprises the following steps: constructing a detection substrate material which comprises a metal film and a nanometer particle, wherein the surface of the metal film is modified with functional groups, the metal film has a hydrophobic effect and is smooth and flat, and the nanometer particle has surface enhancing raman activity and is free from modification with the functional groups; dropwise adding the filtration liquid onto the surface of the metal film with the hydrophobic effect; after finishing the dropwise adding, naturally volatilizing the liquid; dropwise adding the colloid containing the nanometer particle with the surface enhancing activity on the surface of the metal film and utilizing a raman spectrometer to detect the colloid on the surface of the metal film; comparing and analyzing the acquired spectrum chart and identifying the category of the organic compound in the to-be-detected article. According to the method, the operation is simple and convenient; the detecting base structure is simple and can be directly used for extracting, absorbing and enriching the analyte in the solution sample; the designed and constructed enhancing system can realizably acquire high-quality SERS test result; the method has the advantages of high sensitivity, excellent repeatability, zero background interference, and the like.

The invention discloses a preparation method of a nano-tin dioxide / carbon base point / nano-silver surface-enhanced Raman substrate. The nano-tin dioxide / carbon base point nanomaterial and silver ions are dissolved in water, and dilute ammonia water is added in a stirring state to adjust the pH Add the reducing agent glucose after being weakly alkaline, and then the nano-tin dioxide / carbon base point / nano-silver composite material can be prepared. The preparation method of the invention is simple and convenient, has no pollution, and has rapid response and strong operability. The obtained nano-tin dioxide / carbon base point / nano-silver composite material has good dispersibility in water because the surface carbon base point has a large number of oxygen-containing functional groups. As a more excellent surface-enhanced Raman substrate, the composite material not only has the electromagnetic enhancement effect of noble metal nanoparticles, but also the compound semiconductor material has a certain chemical enhancement effect. Adsorption of benzene series can be used for surface-enhanced Raman detection.