In recent years, nanoimprint lithography is applied to manufacturing of optical materials and biosensor. However, void and generated gas are caused pattern failures. We proposed cellulose based gas permeable molds to reduce pattern failures. In this research we could raise the mold reproducibility by using the under-layer coating and liquid release agent. It was confirmed that imprinting materials including 10 wt% each of acetone, cyclopentane, and propylene glycol methyl ether acetate (PGMEA) as volatile solvents could also be imprinted accuracy and number of imprinting times were increased. In addition, we succeeded in expand the cellulose based gas permeable mold size 5 times as compared with the conventional cellulose based gas permeable mold by using step and repeat process and large scale quartz mold. Various manufacturing can be expected by increasing the repeatability and the pattern area of the cellulose based gas permeable mold.
Nanoimprint lithography is applied to manufacturing of cell culture dish and biosensor. The outgas released from the material often causes defects on patterns. Gas permeable templates were derived from cellulose for ultraviolet nanoimprint lithography process. The templates were made of thermoset cellulose of acrylic group and methacrylic group. The light transmission rate of the thermoset cellulose film and mechanical properties and pattern structure of the gas permeable template were measured. The template with acrylic group baked at 80 °C for 10 min. showed superior mechanical properties. This suggests the template had a large number of crosslinked points. After pattern transfer from quartz template, structures of the holes, the pillars, and the lines and spaces on the gas permeable template were observed.
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