Fine silver particle powder, method for manufacturing the same, silver paste using the powder, and method of use of the paste

摘要

A method suitable for mass production of nanoparticles with a uniform particle diameter is provided. It is an object to provide a powder of the nanoparticle obtained by this method, a dispersion containing the nanoparticles, and a paste containing the nanoparticles. There is provided a method for manufacturing silver particles including the step of reducing silver in a silver solution containing a protective agent composed of an organic material and a copper component in an amount of 1 to 1,000 ppm relative to the amount of silver to obtain particles having an average particle diameter (DTEM) of 5 to 100 nm as measured using a transmission electron microscope.

主权项

1. A method for manufacturing silver particles, the method comprising:
mixing a copper component in an amount of 1 to 1,000 ppm relative to an amount of silver, a protective agent, and a reducing agent into a solution; and adding a silver solution to the solution to precipitate silver particles of which surfaces are coated with an organic material as the protective agent, thereby obtaining particles with an average particle diameter (DTEM) of 5 to 100 nm as measured using a transmission electron microscope, wherein the molar ratio of the added amount of the protective agent to the amount of silver is 0.1 to 3.0 and the protective agent is a compound having 5 to 8 carbon atoms.