Controlled Nanopores in Thin Films of Nonstoichiometrically Supramolecularly Assembled Graft Copolymers.
Herein, nanometer-scale morphologies of graft-copolymer-like supramolecular thin films, composed of sulfonic acid terminated polystyrene (SPS) and poly(2-vinylpyridine) (P2VP), and their application to antireflection coatings were investigated. The intermolecular complexes of SPS and P2VP, formed through nonstoichiometric multiple hydrogen bonding between the sulfonic acid group of SPS and the nitrogen atom in pyridine unit of P2VP, occurring in film deposition allowed for the formation of spherical micelles (with SPS and P2VP as the corona and core, respectively) in the thin film. Interestingly, the domain size of the micelles was tunable from approximately 20 to 90 nm on average by controlling either the blend ratio of components or the concentration of polymer solution. Furthermore, nanoporous thin films could be easily prepared by removing the core of micelle-based nanostructures by using a simple solvent etching process, leaving sulfonic acid groups on the surface of nanopores, which can be utilized as potential functional sites. Those resultant nanoporous thin films were conveniently employed as an antireflection layer on a glass substrate, giving a maximum 97.8 % transmittance in the visible wavelength range.
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea).
Suk Man
SM
Cho
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea).
Giyoung
G
Song
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea).
Sun Kak
SK
Hwang
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea).
Richard Hahnkee
RH
Kim
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea).
Jinseong
J
Lee
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea).
Seunggun
S
Yu
Department of Chemical and Biological Engineering, Korea University, Seoul, 136-713 (Republic of Korea).
June
J
Huh
Department of Electrical and Computer Engineering, Division of Energy Systems Research, Ajou University, Suwon, 443-749 (Republic of Korea). huijoon@ajou.ac.kr.
Hui Joon
HJ
Park
Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 (Republic of Korea). cmpark@yonsei.ac.kr.
Cheolmin
C
Park
micelles; nanostructures; polymers; supramolecular chemistry; thin films