Easy orientation of diblock copolymers on self-assembled monolayers using UV irradiation
Pang-Hung Liu, Patrick Guenoun, and Jean Daillant
TL;DR
This paper presents a straightforward UV/ozone treatment method to precisely control surface energy, enabling the orientation of diblock copolymer mesophases on self-assembled monolayers, which is crucial for nanofabrication.
Contribution
It introduces a simple UV/ozone technique to tune surface energy for directing diblock copolymer orientation, enhancing control over nanostructure alignment.
Findings
Perpendicular lamellar phase at surface energy 23.9-25.7 mN/m
Perpendicular cylinders at 24.6 mN/m
Parallel cylinders at 26.8 mN/m
Abstract
A simple method based on UV/ozone treatment is proposed to control the surface energy of dense grafted silane layers for orientating block copolymer mesophases. Our method allows one to tune the surface energy down to a fraction of a mN/m. We show that related to the surface, perpendicular orientation of a lamellar phase of a PS-PMMA diblock copolymer (neutral surface) is obtained for a critical surface energy of 23.9-25.7 mN/m. Perpendicular cylinders are obtained for 24.6 mN/m and parallel cylinders for 26.8 mN/m.
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