Method for preparing nickel-silver coreshell structure nanoparticles

Abstract

The invention relates to the field of a functional nanometer material and a material preparation, particularly to a method for preparing nickel-silver coreshell structure nanoparticles. The method particularly comprises the following steps of: dissolving silver nitrate in water, adding sodium hydroxide and adjusting solution by ammonia water until the solution becomes transparent again to obtain a main salt; dissolving glucose and tartaric acid in a mixed solution of ethanol and water to obtain a reducing solution; and washing sensitized nanometer nickel powders, adding the washed powders to the main salt, dripping the reducing solution in the main salt while stirring, separating the product by a magnet after stirring for 1h at normal temperature, washing the separated product by de-ionized water and absolute ethanol, and vacuum-drying the washed product for 12h at the temperature of 40 degrees centigrade to obtain the nickel-silver coreshell structure nanoparticles. The nickel-silvercoreshell structure nanoparticles are synthesized on the basis of the prepared nanometer nickel particles; the operation method is simple and easy to implement; the reaction condition is moderate; the required equipment is simple; the shell layers of the prepared nickel-silver coreshell structure nanoparticles have strong bonding force and good dispersity and are covered densely; and the thickness of the silver shell can be controlled by changing the quantity of the silver nitrate.

Description

technical field [0001] The invention relates to the field of functional nanometer materials and material preparation, in particular to a method for preparing nickel-silver core-shell nanoparticle. Background technique [0002] Composite nanoparticles contain two or more components and have unique or diverse properties, so they have wider applications than single nanoparticles. Therefore, in recent years, in the process of unremitting exploration of high-performance new materials, The synthesis, preparation and application of composite nanoparticles have attracted more and more people's attention. An attractive research hotspot in this field is the nano-bimetallic materials with core-shell structure. Compared with single metals and traditional bimetallic components (alloys or As far as binary metal) nanoparticles are concerned, the core-shell bimetallic particles have special electronic structure and surface properties, which not only maintain the physical and chemical proper...

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Problems solved by technology

Due to the large specific surface area of ​​nickel powder particles, the surface state of the particles has an important influence on the chemical and physical properties of the particles. Using various organic and inorganic materials to modify the surface of nickel powder can effectively eliminate surface defects, so as to achieve Macroscopic control of the properties of nickel powder, this core-shell structure not only maintains the physical and chemical properties of the original metal nickel core, but also has the excellent metal properties of the silver coating layer, which improves the oxidation resistance and thermal stability of pure nickel powder. It maintains the high conductivity of nickel and silver; and the nickel in the coating powder can inhibit the dissolution of silver, which can overcome the defect of silver migration in the silver conductive adhesive, and achieve the purpose of saving precious metals and protecting the environment. Therefore, it is used in optics, magnetism, and catalysis. , biochemistry, biomedical fields, electronic paste, conductive fillers, conductive coatings, electronic shielding materials and many other fields have good application prospects, but because in most cases the coating degree of the metal shell is low and the coating is uneven, Therefore, it remains a challenge to fabricate uniform and fully coated Ni-Ag core-shell structures.

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