Highly asymmetric lamellar nanostructures from nanoparticle–linear hybrid block copolymers. Issue 31 (30th July 2020)

• Record Type: Journal Article
• Authors: Watanabe, Kodai; Katsuhara, Satoshi; Mamiya, Hiroaki; Kawamura, Yukihiko; Yamamoto, Takuya; Tajima, Kenji; Isono, Takuya; Satoh, Toshifumi
• Is Part Of: Nanoscale. Volume 12:Issue 31(2020)
• Page Start: 16526
• Page End: 16534
• Publication Date: 2020-07-30
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0nr05209d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The compositionally asymmetric nanoparticle-linear hybrid block copolymers with a polystyrene single-chain nanoparticle and a long linear polylactide demonstrated the astonishing capability to produce the highly asymmetric lamellar nanostructures. 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.