14 results about "Metallic clusters" patented technology

The invention provides an atomic precision metal cluster containing a multi-layer ligand spherical shell and a water phase synthesis method of the atomic precision metal cluster. The aqueous phase synthesis method comprises the following steps: performing first mixing on a metal precursor aqueous solution and a ligand aqueous solution, supplementing water to obtain an initial solution, and performing second mixing; then adding a reducing agent aqueous solution to obtain a reaction mixed solution; carrying out first stirring on the reaction mixed solution, concentrating, carrying out second stirring, and supplementing water; and repeating the operations of concentration, secondary stirring and water supplementation to obtain the atom precise metal cluster containing the multilayer ligand spherical shell. The multi-layer ligand spherical shell is adopted to protect the cluster, so that the cluster core can stably exist in an extremely long time without obvious change, and co-production, storage and utilization of related clusters are facilitated; and the metal clusters with uniform size and precise atoms can be directly obtained and have the same molecular weight, so that the post-treatment step can be simplified, and the feasibility of product amplification and application is enhanced.

This invention relates to the field of photocatalytic materials technology, disclosing an atomic-level catalytic material, its preparation method, and its application. The method includes mixing nickel chloride with deionized water to form a solution, adding thiourea and mixing thoroughly to obtain a mixture; ultrasonically treating the mixture and continuously stirring until completely dissolved; drying the dissolved solution in an oven to obtain a solid powder; placing the solid powder in a muffle furnace and calcining it in air, then cooling to obtain the atomic-level catalytic material. This atomic-level catalytic material exhibits a nanoflower-like structure, containing nickel elements distributed in single-atom form, without metal clusters. This invention is applied to the photocatalytic carbon dioxide reduction reaction. The introduction of nickel single atoms promotes the separation and migration of photogenerated charge carriers within the material, causing the carbon dioxide reduction reaction pathway to favor methane production, thus improving the selectivity of the target product in the catalytic reaction.

The invention belongs to the technical field of copper-based catalytic materials and water treatment, and particularly relates to a solar thermal field-electro-catalysis synergistic copper-based catalytic material for groundwater pollution remediation, a preparation method, a water treatment device and application. According to the copper-based catalytic material, the high catalytic activity of copper single atoms, the plasmon resonance effect of metal clusters and the excellent H2O activation capacity of a CN substrate are utilized, the photothermal effect is generated through optical excitation, the mass transfer rate of H2O to the substrate is remarkably increased, the dissociation reaction of H2O is promoted, protons and active hydrogen are efficiently generated, and electrochemical hydrodehalogenation and NO3-electrocatalytic reduction are driven. The process effectively solves the problem of reaction kinetics limitation caused by low proton transfer efficiency in the traditional process, greatly accelerates proton transfer and optimizes electron-proton cooperative transfer efficiency, and provides a new way for research and development of groundwater organic-inorganic pollution cooperative treatment and sustainable development technologies. The method has the advantages of remarkable environment and energy conversion.

The invention discloses an internal functionalized dynamic self-adaptive cage based on sandwich type metal clusters and a preparation method of the internal functionalized dynamic self-adaptive cage, and belongs to the technical field of compound synthesis. The preparation method comprises the following steps: refluxing a hexaalkyl-substituted trimerization bromide compound, imidazole, cesium carbonate and cuprous iodide in a solvent in a dark place, and carrying out a substitution reaction to prepare an imidazole base plate; the preparation method comprises the following steps: heating and refluxing an imidazole base plate and allyl bromide in a solvent, concentrating and precipitating to obtain a solid, and reacting the solid with NH4BF4 to prepare tri-imidazolium salt; the preparation method comprises the following steps: refluxing triimidazolium salt, a nonmetal simple substance and potassium carbonate in a solvent to prepare a ligand; and mixing and stirring the ligand solution and the sandwich type organic metal cluster complex solution to prepare the sandwich type organic metal cluster complex. The invention develops a coordination cage with an aliphatic characteristic cavity, a flexible aliphatic unit in the cavity can be adaptively deformed according to the shape and size of an object, strong affinity is generated in the object combination process, and a thought is provided for developing a function-oriented supramolecular system.

The invention discloses a metal cluster synthesis method, which belongs to the field of electrochemistry and comprises the following steps: in an alkaline electrolyte, taking a pre-prepared graphite flake (D / O-C) containing oxygen-enriched carbon pits as a working electrode, Hg / HgO as a reference electrode and a pre-prepared metal anode as a counter electrode; a metal source is subjected to electro-deposition under the constant-current polarization conditions that the current density is-200mAcm <-2 >, the atmosphere is air, and the reaction environment temperature is the room temperature of 20-25 DEG C to obtain the corresponding metal cluster. According to the invention, cheap, easily available and efficient graphite flakes are used as electrodes, the reaction conditions are mild, heating is not needed, energy is saved, operation is simple, products are easy to separate, and the catalyst is easy to recover. The method has the advantages of being high in controllability, high in efficiency, wide in applicability, easy to achieve automation and large-scale production, environmentally friendly and the like.

The invention discloses a silver nano-cluster and a preparation method and application thereof, belongs to the technical field of metal cluster materials, and aims to synthesize Ag NCs by taking PEI as a template and ascorbic acid as a reducing agent. The invention also discloses an application of the silver nanocluster in pH sensing. As the pH sensor, the Ag NCs provided by the invention can show obvious fluorescence intensity and absorbance changes along with the change of acidity, so that the Ag NCs can combine the advantages of high sensitivity of fluorescence detection and simplicity, convenience, rapidness and the like of a colorimetric method, and has more obvious advantages compared with other nanoscale pH sensors.

The invention belongs to the technical field of nano composite materials, and discloses a preparation method of a metal nanocluster confinement covalent organic framework composite.The method comprises the steps that firstly, a nanosecond pulse laser liquid phase is adopted for ablating a metal target material, secondary laser irradiation is conducted on obtained dispersion liquid at low temperature, and a metal nanocluster colloidal solution is prepared; and then, adding an aldehyde precursor and an amine precursor of a covalent organic framework into the colloidal solution, and carrying out mixing, standing polymerization reaction, washing and drying to obtain the final composite material. According to the method, an exogenous chemical reducing agent does not need to be used, and synchronous and uniform confinement packaging of the metal nanoclusters in the covalent organic framework pore channel generation process is achieved through an in-situ polymerization strategy. The prepared composite material has high dispersibility and high activity of the metal cluster and structural integrity and confinement stability of a carrier material, and has a good application prospect in the field of heterogeneous catalysis.

The application discloses a preparation method and application of a single-atom and atom-accurate cluster co-supported catalyst. Before a metal source of a metal cluster source is introduced, a stable metal molecular cluster is formed by strong coupling of 2-Methyl-1H-benzimidazole-1-methanol organic ligand and a metal center. The strong coupling of the organic ligand to the metal center effectively avoids aggregation in a subsequent pyrolysis process, so that the metal cluster exists in an orderly arrangement and in a controllable atom number. The application prepares a series of atom-accurate cluster and single-atom supported carbon carrier catalysts and applies the catalysts to an electrocatalytic nitrate reduction field, so that efficient and directional conversion of nitrate is realized.

This invention belongs to the interdisciplinary field of coordination chemistry and nanomaterials, and discloses an ultrastable, strongly luminescent N-heterocyclic carbene-protected chiral heterometallic cluster and its preparation method. This invention utilizes multidentate chiral... R / S -NHC ql A well-designed and modular construction strategy using the -PF6 ligand resulted in a highly stable chiral heterometallic cluster, which remains stable in air up to 200°C. The chemical formula of this enantiomeric cluster is: C 74 H 66 AuCu4F6I4N8OP (abbreviated as: R / S -NHC ql -AuCu4 ‑ I), belongs to the orthorhombic crystal system, and its space group is chiral space group. P 21212. This cluster exhibits strong orange luminescence at room temperature with a luminescence quantum yield as high as 93%. It possesses advantages such as ultra-high photoluminescence quantum yield with thermally activated delayed luminescence characteristics, microsecond lifetime at room temperature, circularly polarized luminescence, and good solubility, radiation resistance, and high-temperature resistance. The external quantum efficiency of the CP-OLED prepared by solution processing reaches as high as 20.8%, opening up new avenues for developing novel solution-processable cluster-based CP-OLEDs.

This invention belongs to the interdisciplinary field of coordination chemistry and nanomaterials, and discloses an ultrastable, strongly luminescent N-heterocyclic carbene-protected chiral heterometallic cluster and its preparation method. It is prepared by a simple synthetic method using a chiral N-heterocyclic carbene as the protecting ligand. Its chemical formula is: C 72 H 61 AuCl6Cu4F6N8O 0.5 P (abbreviated as: R / S -NHC ql -AuCu4 ‑ Cl), belongs to the orthorhombic crystal system, and its space group is chiral space group. C 2221. Another of the nanoclusters has the chemical formula: C 77 H 73 AuBr4Cl2Cu4F6N8O 1.5 P (abbreviated as: R / S -NHC ql -AuCu4 ‑ Br), belongs to the orthorhombic crystal system, and its space group is chiral space group. P 212121. These clusters have their structure in the air and can be stable up to 150°C. R / S -NHC ql -AuCu4 ‑ Br exhibits strong orange luminescence in air at room temperature, with a fluorescence quantum yield of 62%. Its chiral structure and strong luminescence give it excellent chiral luminescence properties, making it promising for applications in holographic projection, information storage, and cell imaging.

The present application relates to the technical field of photoresist, in particular to a photoresist composition and a preparation method thereof; the photoresist composition comprises 30-45 parts of p-hydroxystyrene copolymer, 2-4 parts of triphenylsulfonium salt, 8-15 parts of metal cluster, 10-20 parts of ethylene oxide, 2-3 parts of free radical photoinitiator and 30-40 parts of solvent; the p-hydroxystyrene copolymer is used as the main body, the triphenylsulfonium salt is used as the photoacid generator, the metal cluster is added to increase the absorption of ultraviolet light, the dendritic ethylene oxide resin is connected with each other to form a crosslinked network structure after ring-opening reaction under acidic conditions, the solubility of the photoresist film is reduced, the free radical photoinitiator is added, a negative photoresist composition is prepared, the negative photoresist composition has strong absorption capacity for deep ultraviolet light, the sensitivity and the etching resistance of the photoresist are improved, the minimum resolution size of the photoresist is small, the irradiation area forms a network structure and is not easy to be eluted, and the overall performance of the negative photoresist is improved.

The invention discloses a rare earth loaded nano material as well as a preparation method and application thereof. The rare earth loaded nano-material comprises a silicon-based nano-material of which the surface is modified with an active ligand, wherein the silicon-based nano-material is loaded with a metal cluster; the metal cluster comprises hydrogenated rare earth metal. In the rare earth loaded nano material, an ordered local structure is introduced into an initial disordered network of the material to establish local active sites, then surface ligand modification is utilized to realize the dispersity of the material, and meanwhile, the stability of a core structure of the material is improved. The functionalized nano-material disclosed by the invention has an extremely high application prospect in the fields of biological medicine development, diagnosis and treatment integration, sensing and the like.

The invention provides an atom precise metal cluster containing bound positive and negative ion pairs and a water-phase synthesis method thereof. The aqueous phase synthesis method comprises the following steps: performing first mixing on a metal precursor aqueous solution and a ligand aqueous solution, supplementing water to obtain an initial solution, and performing second mixing; then adding a reducing agent aqueous solution to obtain a reaction mixed solution; and stirring the reaction mixed solution to obtain the precise atomic metal cluster containing bound positive and negative ion pairs. According to the invention, the cluster is protected by using the bound tight ion pair, so that the cluster core can stably exist in a long time, and the metal cluster with uniform size and precise atoms and with the same molecular weight can be directly obtained, so that the post-treatment step can be simplified, and the feasibility of product amplification and application can be enhanced. In addition, water is used as a unique solvent, so that the generation of waste liquid is reduced.

The invention provides a metal cluster containing bound positive and negative ion pairs, a preparation method of the metal cluster, a high-dispersion metal catalyst and a preparation method and application of the high-dispersion metal catalyst. The preparation method of the metal cluster containing bound positive and negative ion pairs comprises the following steps: dissolving a metal compound in a mixed solution containing water, alcohols and a ligand, and mixing to obtain a metal precursor solution; and sequentially adding a protective agent and a reducing agent into the metal precursor solution, and mixing to obtain a solution of metal clusters containing bound positive and negative ion pairs. The high-dispersion metal catalyst provided by the invention can be directly prepared by dipping carrier particles into a metal cluster solution protected by bound positive and negative ion pairs; by dynamically loading bound positive and negative ion pairs on the metal surface, excessive metal aggregation in the catalyst preparation process can be prevented, so that the effect of controlling the metal dispersity is achieved, and the technical route of implementing bound positive and negative ion pair protection and cluster soft landing on metal clusters is realized.