Direct metal patterning by two-step transfer printing of conductive metal nano-inks

Recently there are growing interests in reliable and economical processes for the printed electronics fabrication. In this article we present a new direct metal patterning method by two-step transfer printing process of conductive metal nano-ink solution. This fabrication process consists mainly of two steps: (1) transfer of metal nano-ink solution from the ink-substrate to the polymer stamp, and (2) transfer of metal nano-ink solution from the polymer stamp to the target-substrate. This fabrication method allows simple direct patterning of various microscale metallic structures. Further, low temperature and pressure process conditions are compatible with the fabrication of electronic structures and devices on flexible polymer substrates.