Patent ID: 6090858
Filing Date: 2000-07-18
Classification: B01J,B82Y,C01G,C01P

Abstract:
A method for producing colloidal nanoparticles utilizing capping material and metal ions selected from the group consisting of transition metals, comprising the steps of:providing a solution of a transition metal salt and water in a reaction vessel;determining a concentration ratio of a capping material to transition metal ions such that colloidal nanoparticles of a desired shape distribution will be produced when said concentration ratio of capping material to metal ions is present in said reaction vessel;mixing a quantity of said capping material in said solution such that said concentration ratio of said capping material to said transition metal ions in said solution is established;passing an inert gas through said solution;passing hydrogen through said solution so that said transition metal ions in said solution are reduced; andallowing said solution to stand in said reaction vessel until said colloidal particles of said desired shape distribution are formed in said solution;wherein said desired shape distribution is a distribution of one or more particles selected from the group consisting of: cubic particles, tetrahedra, polyhedra, and irregular-prismatic particles.