Vapor phase preparation method of core-shell structure Cu / Ag nano alloy

Abstract

The invention discloses a vapor phase preparation method of a core-shell structure Cu / Ag nano alloy, and belongs to the technical field of nano materials, the preparation method is as follows: dual source gas aggregation clustering growth, to be more specific, an inert buffer gas is introduced into a condensation chamber, a constant air pressure is kept, Cu and Ag powder are simultaneously thermally evaporated by magnetron sputtering of Cu and Ag elemental target materials or by double crucibles to produce dense Cu and Ag atom gases, nucleation growth of Cu and Ag atoms is performed in a buffer gas atmosphere to form Cu and Ag clusters, the Cu and Ag clusters flow with the buffer gas to a nozzle at the top of the condensation chamber for further growth of core-shell structure Cu / Ag nano alloy clusters; and cluster beam deposition, to be more specific, Cu / Ag clusters are sprayed along with the buffer gas from the nozzle to a high vacuum chamber to complete growth and form a directional cluster beam to deposit on the surface of a substrate to obtain the Cu / Ag nano alloy. The vapor phase preparation method belongs to a physical preparation method, and has the advantages of simple operation, high versatility, good process control and no error making, and the prepared product has high purity, clean surface and good monodispersity.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a gas-phase preparation method of a Cu / Ag nano-alloy with a core-shell structure. Background technique [0002] Core-shell bimetallic nanoparticles have attracted widespread attention due to their special atomic arrangement and unusually excellent physical and chemical properties, and have shown great potential in various applications, especially in the fields of optics and catalysis. However, most of the existing methods for preparing core-shell nanoparticles are chemical methods. The preparation process is cumbersome, difficult to control, and is easy to generate impurities, especially the surface is usually wrapped with ligands, so that it is difficult for optical, electrical, catalytic, etc. performance impact. [0003] Gas aggregation is an important method for gas-phase preparation of clusters and nanoparticles. On the one hand, this method can obtain a relati...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a vacuum gas-phase preparation method of Cu / Ag nano-alloys with core-shell structure, which belongs to the physical method and can avoid the cumbersome process and difficult control of the existing chemical methods for preparing nanoparticles with core-shell structure. It is easy to introduce impurities, and there are problems such as ligand wrapping on the surface

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