Method of preparing nickel-silver nuclear shell structure nano-particles

Abstract

The invention relates to the field of preparation of functional nanometer materials and materials, in particular to a method of preparing nickel-silver nuclear shell structure nano-particles. The method specifically comprises the following steps of: dissolving silver nitrate into water as plating solution; clearly cleaning nanometer nickel powder which is sensitized by sub-tin ions, adding plating solution, stirring and dispersing, after a certain time, titrating clear liquid through diluted hydrochloric acid to observe whether white precipitate is generated, and checking existence of Ag<+> so as to judge whether reaction is complete; after reacting completely, separating a product through a magnet, washing by deionized water and absolute ethyl alcohol, and drying in vacuum at 40 DEG C for 12 hours. According to the invention, the nickel-silver nuclear shell structure nano-particles can be synthesized on the basis of the prepared nanometer nickel particles, the operating method is simple and practicable, moderate in reaction conditions and simple in required devices, the prepared nickel-silver nuclear shell structure nano-particles has the advantages of strong binding force, good dispersibility and compact coating, and furthermore, the thickness of a silver shell can be controlled through changing additive amount 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 preparation method of nickel-silver core-shell nanoparticle. Background technique [0002] Composite nanoparticles contain two or more components with 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 propertie...

AI Technical Summary

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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