Figure 13.

(a) A self-assembled concentric in-plane cylindrical pattern obtained by the directed self-assembly of PS-b-PDMS BCP in circular trenches of a diameter of 800 nm. (b) SEM image of a 23 nm thick PS-b-PMMA film displaying 160 nm wide dot-patterned plateau domains spaced by 160 nm wide patternless trenches assembled on a topographically modified substrate prepared by EBL. (c) Cross-sectional SEM image of the nanofins of a periodicity of 35 nm fabricated in a nanofin array of periodicity of 395 nm. (d) PS-b-PDMS BCP alignment into 2D wrinkles with jog angles (perpendicular BCP alignment for 10% pre-strain was maintained). (e) SEM image of hierarchically crumpled (two times in two orthogonal directions) lamellae of PS-b-PDMS BCP on chemically modified graphene. (f) AFM image depicting submicroscopic surface relief patterns obtained by breath figure method. Adapted with permission from ref. [219] (a), ref. [273] (b), ref. [268] (c), ref. [279] (d), ref. [280] (e), and ref. [281] (f). Ref. [268]—Published by The Royal Society of Chemistry. Copyright (2019, 2020) American Chemical Society and (2015, 2017, 2019) John Wiley and Sons.