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- Title
Two-dimensional directed lamellar assembly in silicon- and fluorine-containing block copolymer with identical surface energies.
- Authors
Jeon, Seungbae; Lee, Seungjae; Kim, Junsu; Eim, Sungoh; Lee, Wooseop; Nam, Woo Hyun; Son, Jeong Gon; Ryu, Du Yeol
- Abstract
A block copolymer (BCP) with specific monomer structures of fluoroacrylate polymers was designed by exploiting the inorganic superhydrophobicity and low glass transition temperature of polydimethylsiloxane (PDMS). With the use of a fluorine-containing block providing a surface tension as low as that of PDMS (19.9 < γ < 21.5 mN/m), PDMS-b-poly(2,2,3,3,3-pentafluoropropyl acrylate) (PDMS-b-PPeFPA) copolymer was synthesized to create a volume-symmetric lamellar structure. The compositional randomness of the BCP chains adsorbed onto the substrates provided well-balanced interfacial interactions toward the overlaid PDMS-b-PPeFPA (γ PDMS-ads ≈ γ PPeFPA-ads). Under this symmetric confinement with simultaneous dual neutral interfaces, lamellar microdomains with a sub-10 nm half-pitch feature size were successfully oriented perpendicular to the interfaces at room temperature. We showed the response of the BCP films to a lateral electric field, demonstrating that the perpendicular lamellae were adaptively aligned along the electric vector within a short treatment period. Furthermore, the PDMS-b-PPeFPA system exhibited a remarkable etch contrast for O2 reactive ion etching, yielding unidirectionally aligned air–inorganic nanoarrays emanating from the perpendicular lamellae between the electrodes. This study reports a system engineering approach for conceiving highly immiscible, silicon- and fluorine-containing BCP whose components exhibit identical surface tensions (γ PDMS ≈ γ PPeFPA) and for generating perpendicularly oriented lamellar microdomains due to substrate neutrality. With the use of a fluorine-containing block providing a surface tension as low as that of PDMS (19.9 < γ < 21.5 mN/m), the PDMS-b-PPeFPA copolymer is synthesized to create a volume-symmetric lamellar structure. Under the symmetric confinement with simultaneous dual neutral interfaces, lamellar microdomains with a sub-10 nm half-pitch feature size are successfully oriented perpendicular to the interfaces at room temperature (RT). Together with unidirectionally aligned perpendicular lamellae along the electric vector in a short period (0.5 h) at RT, we demonstrate a unidirectional alignment of the perpendicular air–inorganic (oxidized PDMS) lamellae between the electrodes.
- Subjects
SURFACE tension; GLASS transition temperature; POLYDIMETHYLSILOXANE; SYSTEMS engineering; SURFACE energy; ELECTRIC fields; FLUOROPOLYMERS; POLYMER structure
- Publication
NPG Asia Materials, 2023, Vol 15, Issue 1, p1
- ISSN
1884-4049
- Publication type
Article
- DOI
10.1038/s41427-023-00519-3