Peelable porous nanosheet fabricated by roll-to-roll coating and nanoimprinting technique

Abstract A combination of roll-to-roll coating and nanoimprinting technique is proposed for large-scale fabrication of porous nanosheets. Poly ( d , l -lactic acid) (PLA) in 2-methoxy-1-methylethyl-acetate is roll-to-roll coated on polypropylene substrate to obtain nanosheets with thickness above ca. 95 nm. Roller nanoimprinting with a nickel mold is applied to fabricate pores on nanosheets with diameter of ca. 1.2 μm. The imprinted PLA nanosheets with thickness above ca. 129 nm can be directly peeled from the substrate using a polyester adhesive tape frame with open circle of 30 mm. This method shows promising potential for achieving continuous production of porous nanosheets to facilitate their application. Graphical Abstract