METHOD FOR PREPARING CONDUCTIVE BALL USING CARBON NANO TUBE

摘要

A method for preparing conductive balls is provided to improve electroconductivity of conductive balls and to form an ion-bonded multilayer by a self assembled monolayer, thereby preventing crack of a conductive layer causable by a characteristic difference between a polymer and metal. A method for preparing conductive balls includes the steps of: (1) subjecting the surfaces of polymer beads to direct sulfonation to change the surfaces of the polymer beads into sulfone groups; (2) mixing the modified polymer beads(A) with a mixture of a cationic electrolyte solution and a solvent to form a cationic layer(B) on the surface of the modified polymer bead; (3) mixing the cation-stacked polymer beads with a mixture of an anionic electrolyte solution and a solvent to form an anionic layer(C) on the surface of the cation-stacked polymer bead; (4) to form a desired layer, alternately coupling anionic/cationic layers through a repetitive self assembled monolayer comprising the step 2 and step 3, thereby forming a multilayer having a finally cationic layer on the surface of the bead; and (5) mixing the modified polymer beads of the step (4) with surface-modified carbon nanotubes dispersed in a solvent to form polymer beads coated with carbon nanotubes(D).