METHOD FOR PREPARATION OF NANO-METAL INK

摘要

A method for preparing a nano-metal ink is provided to simplify the manufacturing process, to improve production yield, to allow the production velocity, stability and physical properties to be controlled easily. A method for preparing a nano-metal ink comprises the steps of applying high voltage between electrodes made of catalyst metal to produce spark, thereby forming some of the catalyst metal into a catalyst nanoparticle; carrying the catalyst nanoparticle with a carrier gas to supply to a source solution containing a metal ion; and initiating and accelerating the reduction of a metal ion of the source solution by the catalyst nanoparticle so as to produce a metal nanoparticle of high purity and to disperse the produced metal nanoparticle uniformly in the solution. The size of the catalyst nanoparticle is controlled by the flux of the carrier gas; the agglomeration of the metal nanoparticle is inhibited by the application of ultrasonic wave to the source solution; the source solution comprises a metal salt, a reducing agent, a stabilizer, a pH controller, a dispersion controller and a viscosity controller; the catalyst metal is at least one selected from Ni, Cu, Fe, Pd, Pr, Au and Ag; and the metal ion is at least one selected from Ag^+, Cu^2+, Pd^2+, Ni^+ and Au^3+.