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PDMS stamp fabrication. (a) Photopolymer flexographic master mold (Fmold). (b,c) The epoxy resin mold (ERmold) is formed on the Fmold and cured at room temperature. (d,e) The ERmold is demolded after 72 h. (f,g) The PDMS is cast on the ERmold and cured at 40 °C overnight. (h,i) The PDMS replica is peeled off. (j,k) The PDMS stamp is used for microcontact printing.
