Aqueous-based method for producing ultra-fine metal powders

摘要

The present invention provides a method for forming compositions having a plurality of ultra-fine metallic particles, and the metallic composition produced therewith. Also provided is a substrate coated with the plurality of ultra-fine metallic particles obtained in accordance with the method of the present invention.

主权项

1. A method for forming a plurality of ultra-fine metallic particles comprising:
(a) obtaining a reducing solution comprising a reducing agent and a stabilizing agent; (b) obtaining a metal-ammonia solution comprising a metal-ammonia complex by reacting a metal nitrate with one of ammonium hydroxide and ammonia, wherein the reaction consists of water, the metal nitrate, and either the ammonium hydroxide or the ammonia, and further wherein said metal-ammonia solution is obtained under atmospheric pressure; (c) forming a reaction mixture comprising the reducing solution and the metal-ammonia solution; (d) maintaining the reaction mixture under a suitable condition for a time effective to reduce the metal-ammonia complex to metallic particles; and optionally, (e) isolating the metallic particles.