Journal
ADVANCED MATERIALS INTERFACES
Volume 9, Issue 20, Pages -Publisher
WILEY
DOI: 10.1002/admi.202200660
Keywords
block copolymers; directed self-assembly; hierarchical nanopatterns; interfacial self-assembly; nanofabrication; nanopatterning
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2021R1C1C2012905, NRF-2021R1A2C2007339]
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This study introduces a directed self-assembly strategy to control the pattern direction of strand morphology by gradual morphology transition, and successfully fabricates highly aligned nanostrand arrays in a large area. In addition, a method for density-doubled metal nanowire fabrication and hierarchical BCP nanopatterning using the aligned nanostrand array as a template is demonstrated.
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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