Abstract
Roll-to-roll (R2R) ultraviolet (UV) imprinting technology, because of its merits of low cost, high throughput, and large-area patterning, is attracting interest from academia and industry for continuous fabrication of micro/nanostructures. Early reports of UV imprinting can be traced back to the 1970s, while R2R UV imprinting did not appear in the literature until 2006. This review surveys recent progress of R2R UV imprinting technology in terms of UV-curing resin material behavior, innovative apparatus, and typical processes involved in this method including resist filling, UV exposure, UV curing, and demolding. Roller mold fabrication is also thoroughly discussed, and challenges and innovations in mold fabrication techniques are comprehensively summarized. Typical industrial applications of UV imprinting are systematically cataloged. Finally, technical challenges and future trends for R2R UV imprinting technology to fabricate micro/nanostructures are presented.
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