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    Air-Water Interfacial Directed Self-Assembly of Block Copolymer Nanostrand Array

    Year: 2022

    Journal: Adv. Mater. Interfaces, Volume 9, JUL

    Authors: Kim, Dong Hyup; Kim, So Youn

    Organizations: National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2021R1C1C2012905, NRF-2021R1A2C2007339]

    Keywords: block copolymers; directed self-assembly; hierarchical nanopatterns; interfacial self-assembly; nanofabrication; nanopatterning

    Interfacial self-assembly (ISA) of block copolymers (BCPs) creates various periodic 2D nanostructures at the air-water interface, such as dot, strand, and planar morphologies, which are widely used in various applications. Here, a directed self-assembly strategy to control the pattern direction of ISA of strand morphology, so-called nanostrands, in a large area using a gradual morphology transition is introduced. ISA of BCPs in a lens-shaped droplet of a concentrated BCP solution at the air-water interface shows the gradual morphology transition from the edge to the center of the droplet. The gradual morphology transition is explained by the spreading area-dependent dewetting mechanism. Furthermore, a dense nanostrand array in a large area which is highly aligned normal to the radial direction of the droplet at an intermediate transition regime is found. In addition, a density-doubled metal nanowire fabrication and a hierarchical BCP nanopatterning by using the highly aligned nanostrand array as a template are demonstrated.
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