Patent ID: 8147908

Claim:
A method of producing organoamine-stabilized silver nanoparticles, comprising: forming a solution comprising an organic solvent and a first amount of organoamine and heating the solution to a first temperature; wherein the first temperature is from about 50° C. to about 80° C.; adding a silver salt to the solution heated to the first temperature; adding a second amount of organoamine to the solution heated to the first temperature; cooling the solution from the first temperature to a second temperature; adding a hydrazine to the solution to reduce the silver salt forming a reduced silver salt, and reacting the reduced silver salt with the organoamine to form organoamine-stabilized silver nanoparticles while maintaining the solution at the second temperature; and precipitating the solution after performing the reaction and recovering the organoamine-stabilized silver nanoparticles, by a two-solvent precipitation procedure comprising adding a non-solvent to the solution and then after the non-solvent is added, adding an alcohol to the solution; wherein the molar ratio of silver salt to total organoamine is from about 1:4 to about 1:10.