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O: Fachverband Oberflächenphysik

O 112: Development of Novel Methods I

O 112.8: Vortrag

Donnerstag, 19. März 2020, 17:00–17:15, WIL C107

shear flow-driven dewetting for wrinkle-free transfer of centimeter-scale ultrathin alumina membrane onto arbitrary substrates — •Huanming Zhang, Min Zhou, Rui Xu, and Yong Lei — Institute für Physics & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693 Ilmenau

The transfer of ultrathin membrane (UTM) onto arbitrary substrates is important in different practical fields. The polymer-supported transfer of UTM keeps the structure of membrane intact, but suffers from organic residual. Wet transfer is applicable to the UTM without a polymer support, where the liquid surface serves as an underlying support. However, conventional wet transfer methods inevitably induce wrinkle defects as a result of the large contact angle of the trapped droplet between UTM and substrate. To solve this problem, the target substrates always need either hydrophilic treatments or organic liquid wetting. However, they are not applicable to all the substrates. Here we demonstrate a shear flow-driven dewetting method to transfer centimeter-scale membrane onto arbitrary substrates without wrinkle. Compared with hydrophilic treatments or organic liquid wetting, this method is fast, simple, cheap, convenient and safe. Taking widely-used ultrathin anodic aluminum oxide membrane (UTAM) as an example, we investigate the microscale details of these macroscale wrinkles and successfully demonstrate the application of large-area wrinkle-free UTAM to defect-free ordered nanostructure arrays fabrication. Corresponding superiority over the defective counterpart is further studied in optical sensing.