47results about How to "Uniform and controllable shape" patented technology

The invention discloses a preparation method for cuboid-shaped indium oxide single crystal, which belongs to the hydro-thermal method and consists of the steps of preparing a feature control agent, preparing indium saline solution, preparing a precursor, offcenter separation, calcination, natural cooling, etc. By using the feature control agent, the invention solves the problems that the feature of a sample is difficult to control and easy to collapse and the crystal formed is polycrystal when the hydro-thermal method is used in the prior art; preparing the cuboid-shaped indium oxide single crystal with a controllable feature by using the hydro-thermal method is realized; Owing to the invention, the decentrality of the obtained indium oxide single crystal is good; the feature is uniform and controllable; the preparation method of the invention is simple; the raw material is easy to get; the cost is low; the single crystal of the invention can be suitable for a large scale of industrialized production.

The invention relates to a nickel sulfide-cadmium sulfide nanowire heterostructure and a preparation method thereof and belongs to the technical field of preparation of new energy materials. According to the composite material provided by the invention, the main body is the cadmium sulfide nanowire, and dentritic beta-NiS sheets are attached to the surface. The material has excellent capacity of performing visible catalytic decomposition on water to produce hydrogen. The preparation method comprises the following steps: preparing the cadmium sulfide nanowire by a solvent thermal process; taking the obtained cadmium sulfide nanowire as a template, taking nickel acetate as a nickel source, taking thiourea as a sulfur source, taking sodium hypophosphite as a reducing agent, uniformly growing beta-NiS nanosheets on the surface of cadmium sulfide in a hydrothermal environment, thereby obtaining the nickel sulfide-cadmium sulfide nanowire heterostructure with tight combination and dispersing uniformity. The product obtained by the method is high in yield, high in purity and controllable in morphology and does not need after-treatment; and moreover, the method has the advantages of simplicity in equipment and process, strict and controllable synthetic growth conditions, high product yield, low cost, clean and environmental-friendly production process and the like.

The invention discloses a preparation method for a platinum-silver alloy hollow nanoflower. The method comprises the following steps: taking sodium polyacrylate as a stabilizer and taking ascorbic acid as a reducing agent; reducing silver nitrate at the room temperature to synthesize a silver nanoflower; and introducing potassium chloroplatinite as a platinum source through galvanic reducing process, thereby directly obtaining the platinum-silver alloy hollow nanoflower. The preparation method is simple and economical; the obtained platinum-silver alloy hollow nanoflower is regular in shape and is uniform in dimension, has ultrahigh catalytic activity and stability in an alkaline formic acid fuel cell, has a potential application prospect in the fuel cell field, and is suitable for industrial large-scale production.

A method for preparing a bismuth-molybdenum bimetallic sulfide, a negative electrode material for a sodium ion battery, comprising the following steps: (1) weighing a bismuth source and a molybdenum source at a molar ratio of Bi:Mo=2:1, and then adding In the diol container, stir to dissolve, mix the ethylene glycol solution dissolved with bismuth source and molybdenum source, and stir to form a uniform mixed solution; (2) Add absolute ethanol to the mixed solution, stir evenly, and place in the reaction Solvothermal reaction in the still; (3) Centrifugal washing and drying; (4) Place the bismuth molybdenum oxide precursor in the corundum ark and in the middle of the tube furnace, and place a For the corundum ark of the sulfur source, the tube furnace is sealed and the reducing gas is introduced. After heat treatment, it is naturally cooled to room temperature. The invention has short process flow, controllable parameters, simple equipment, wide sources of raw materials, and environmental friendliness, and bismuth-molybdenum bimetallic sulfide materials with different nanoscales can be obtained by adjusting relevant parameters.