Patent ID: 6923923

Claim:
A method for forming a conductive metal pattern comprising the steps of: (i) transferring a metallic nanoparticle cluster ink prepared by adding a bifunctional compound represented by the following formula (1) to a metallic nanoparticle colloid: X—R—Y (1) wherein R is a linear or branched hydrocarbon chain having 2˜22 carbon atoms; and X and Y are independently an isocyano, a sulfonyl, a phosphate, a carboxyl, an amino or a thiol group onto a substrate using a PDMS stamp in a micro-contact printing technique to form a metallic nanoparticle cluster pattern; and (ii) heat-treating the formed metallic nanoparticle cluster pattern in the vicinity of the melting point of metallic nanoparticles to form the conductive metal pattern.