Flexography Printed Pattern Based on Nano-Copper Conductive Ink

This work demonstrates a simple printed electronics process to obtain the copper pattern by flexography. The nano-copper suspension was synthesized by liquid chemical reduction method. The conductive ink was prepared with nano-copper and glycerol. The copper pattern was printed by a flexo graphic printability tester and then dried in an oven at 80 ℃. The copper in square pattern exhibits better conductivity than that in hexagon, because of the higher surface line density. The confocal laser scanning microscope (CLSM) indicates that the heights of the copper patterns are different in relation to printing direction and shape. The morphologies of the two kinds of the copper pattern were fine. This process could apply to the poly (ethylene terephthalate) (PET) substrate and is easily operated. The printed copper pattern would be used for transparent electrode, printed circuit board, antenna and flexible displays.