112 results about "Nano clusters" patented technology

The invention relates to a preparation method of copper nano-clusters with an adjustable and controllable fluorescent color. The method comprises the following steps: dissolving copper metal salt andquaternary ammonium salt into de-ionized water; then carrying out reduction reaction; after reacting, separating and purifying to obtain the copper nano-clusters with a high fluorescent quantum yield.The method provided by the invention is simple and convenient to operate and short in consumed time, moderate in reaction conditions and does not need a large-size instrument; the copper nano-clusters capable of emitting fluorescent light with different wavelengths can be obtained through adjusting alkyl chain lengths of the different quaternary ammonium salt. The preparation method has the characteristics that the fluorescent quantum yield of the obtained copper nano-clusters is high; meanwhile, the fluorescent emission wavelength also has the characteristic that the wavelength is changed along changes of the alkyl chain lengths of the quaternary ammonium salt. By adopting the characteristics, the prepared copper nano-clusters have extremely great potential application value in the aspects of preparation of photoelectric and luminescent devices, biological imaging, sensing detection and the like.

The invention discloses a preparation method of Cs4PbBr6 perovskite nanocrystals with size and shape controllable, and belongs to the technical field of semiconductor nanomaterial preparation. The method comprises the steps that a caesium carboxylate solution is added into a lead bromide solution protected by N2, reaction is conducted under room temperature to synthesize CsPbBr3 nano clusters, andthermal injection is conducted on the CsPbBr3 nano clusters into the caesium carboxylate solution to obtain the Cs4PbBr6 perovskite nanocrystals. The preparation method has the advantages of simple operation, easy adjustment of the size of products, control of the shape of the products and the like.

The claimed invention describes methods and apparatuses for manufacturing nano-aerosols and nano-structured materials based on the neutralization of charged electrosprayed products with oppositely charged electrosprayed products. Electrosprayed products include molecular ions, nano-clusters and nano-fibers. Nano-aerosols can be generated when neutralization occurs in the gas phase. Neutralization of electrospan nano-fibers with molecular ions and charged nano-clusters may result in the formation of fibrous aerosols or free nano-mats. Nano-mats can also be produced on a suitable substrate, forming efficient nano-filters.

The invention discloses a preparation method of graphene / TiO2 flower-like nano-clusters. The invention belongs to the fields of new energy materials, electrochemical, photochemical and photoelectrocatalysis. According to the invention, for a first time, a graphene salt solution is adopted as an electrolyte; short-time anodic oxidation is carried out; and the graphene / TiO2 flower-like nano-clusters are prepared. The method is simple, and has the advantages of easy operation, easy-to-control process, low cost, environment friendliness, and good repeatability. The prepared graphene / TiO2 flower-like nano-clusters have wide application prospect, and can be used as photoelectrocatalysis electrode in environmental fields. The nano-clusters can be used in organic wastewater and waste gas degradation through photoelectrocatalysis. The nano-clusters can be used as photoelectrode in fields such as solar cells, or can be used as a hydrogen storage material in the field of novel energy.

The invention relates to a method for preparing iron oxide particles having controllable morphology and size. The method comprises the following steps: 1, adding a surfactant into an organic solvent,fully stirring the surfactant and the organic solvent to obtain a uniformly dispersed suspension, adding an inorganic alkali and a soluble iron salt into the suspension, and fully stirring the inorganic alkali, the soluble iron salt and the suspension until the inorganic alkali and the soluble iron salt are completely dissolved; 2, pouring a solution prepared in step 1 into a closed heating container, and carrying out a thermal reaction; and 3, separating a precipitate in the obtained reaction solution through a centrifuging or magnet process, repeatedly washing the precipitate with ethanol and deionized water, and carrying out vacuum drying to obtain a black solid which is the final product. The accurate and highly-efficient regulation of the size and the morphology of nano-particles is realized through adjusting the proportion of the reaction solvent and the addition amount of the inorganic alkali under same reaction conditions, the size of the obtained particles is 20-400 nm, and solid particles, nano-clusters, triangular prisms, regular octahedrons and other various morphologies can be obtained. The preparation method has the advantages of simplicity, and green and environmentally-friendly raw materials and technology, the product has the advantages of high crystallinity, stable structure, uniform size and gram level reaching yield, and the preparation method is of great guidance significance to preparing magnetic nano-particles.

The invention discloses application of glutathione-stabilized gold nano-clusters in detection of cysteine and lysine contents. The application comprises the following steps: mixing a newly prepared glutathione aqueous solution and a chloroauric acid hydrated aqueous solution under the vigorous stirring in equal concentration and equal volume, and reacting an obtained mixture for 2-5 days at an illumination condition to obtain a light yellow solution, centrifuging, purifying supernate through a dialyser so as to prepare the glutathione-stabilized gold nano-clusters. The glutathione-stabilized gold nano-clusters can be used as a fluorescent probe or a ratiometric fluorescent probe to respectively or simultaneously detect cysteine and lysine. The application of the glutathione-stabilized gold nano-clusters in the detection of the cysteine and the lysine contents has the characteristics of being high in selectivity, high in sensitivity, simple and easy to implement, and the preparation method is simple and convenient, green and gentle.

The invention belongs to the technical field of functional nanoparticle assembly, and specifically relates to a method of preparing binary nanoclusters with nanoparticle as a structural unit and microemulsion droplets as a template, and preparing a polymer with binary nanoclusters as a core through surface-initiated polymerization. A new method for shell-composite nanoclusters. It includes three steps: synthesis of nanoparticles, preparation of nanoclusters, and surface-initiated polymerization. Oil-soluble nanoparticles can be synthesized by two-phase method, phase transfer method, and high-temperature pyrolysis method, and the size of nanoclusters can be regulated by changing the amount of surfactant and the concentration of nanoparticles. The invention is a new method for preparing bifunctional nano-clusters and compounding them with polymers, which realizes the integration and optimization of various nano-particle functions. After compounding with polymers, it can not only improve the stability of nano-clusters, but also introduce polymerization The special properties of materials can be obtained to obtain nano-micro-scale multifunctional composite materials, which have broad application prospects in the research fields of biology, catalysis, sensing, and optoelectronics.