Patent ID: 8318260
Filing Date: 2012-11-27
Classification: C23C

Abstract:
1. A method for the electroless deposition of nano metallic silver on a substrate comprising steps of: preparing a silver solution and a reducing solution, wherein the silver solution is heat treated and irradiated with neutrons and includes ionic silver to be reduced into metallic silver and the reducing solution includes a reducing agent for reducing the silver solution; and spraying the prepared silver solution and the prepared reducing solution at the same time to a predetermined region above the substrate wherein the silver solution and the reducing solution meet and react in the predetermined region above the substrate to form the metallic silver particles which are deposited as a nano-sized silver layer on the substrate and have a diameter of 2 Å to 30 Å; wherein the silver layer has a surface roughness of less than 3 nm; and wherein the silver solution and the reducing solution are each at a temperature of 20° C. to 35° C.; and wherein the silver solution and the reducing solution are sprayed in a ratio of 1 to 2 equivalents of the reducing agent based on 1 equivalent of the ionic silver with a speed of 100 ml/minute to 300 ml/minute at an air pressure of 2 kg/cm