Issue 31, 2020

Highly asymmetric lamellar nanostructures from nanoparticle–linear hybrid block copolymers

Abstract

The highly asymmetric lamellar (A-LAM) nanostructure is one of the most important template geometries for block copolymer (BCP) lithography. However, A-LAM is unattainable from conventional BCPs, and there is no general molecular design strategy for A-LAM-forming BCP. Herein, a nanoparticle–linear hybrid BCP system is reported, which is designed based on the intramolecular crosslinking technique, as a remarkably effective platform to obtain the A-LAM morphology. The hybrid BCPs consisting of polystyrene single-chain nanoparticles and linear polylactide segments show a remarkable capability to form the A-LAM morphology in bulk, where a maximum width ratio of 4.1 between the two domains is obtained. This unusual phase behavior is attributed to the bulky and rigid characteristics of the nanoparticle block. Furthermore, the thin films of these hybrid BCPs show perpendicularly oriented A-LAM morphology on a chemically modified Si substrate, allowing promising application in the fabrication of asymmetric line-and-space nanopatterns.

Graphical abstract: Highly asymmetric lamellar nanostructures from nanoparticle–linear hybrid block copolymers

Supplementary files

Article information

Article type
Paper
Submitted
20 May 2020
Accepted
26 Jul 2020
First published
27 Jul 2020

Nanoscale, 2020,12, 16526-16534

Highly asymmetric lamellar nanostructures from nanoparticle–linear hybrid block copolymers

K. Watanabe, S. Katsuhara, H. Mamiya, Y. Kawamura, T. Yamamoto, K. Tajima, T. Isono and T. Satoh, Nanoscale, 2020, 12, 16526 DOI: 10.1039/D0NR05209D

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