Roll-to-Roll Apparatus for Residue-Free Direct Stamping of Functional Nano-Inks

Abstract

A tabletop prototype of a roll-to-roll (R2R) direct stamping apparatus has been developed.The prototype is about 100 cm long, 30 cm wide and 40 cm high and is operational up to the web speed of 1 m/min. While upper rolls carry a web with a patterned stamp on it clockwise, a sprayer on top of the R2R apparatus dispenses the nano-ink to fill in the stamp. Two other rolls with adhesive films completely remove the residual layer on the stamp. Final products remain on the substrate after de-stamping in which the web rolls up and the substrate moves to the further right. This roll-to-roll direct stamping apparatus demonstrates high throughput and material efficiency for fabrication of flexible micro-and nano-electronic devices.