Stamp recyclable contact printing of liquid droplet matrix on various surfaces

A direct printing of liquid droplet matrix on various surfaces is demonstrated using a stamp that can be recycled for over 100 times. The technique can be applied to pattern functional organic materials and nanoparticles and fabricate microlens arrays in one step. By controlling the printing pressure and the surface wettability, a feature size that is smaller than that of the stamp was achieved in a tunable manner.