Fig. 2.
SFM phase images of PS-b-PEO (Mn = 26.5 kg/mol) thin films on the faceted sapphire substrate, where the film thicknesses are 38.0 nm for (A) and 47.6 nm for (B) and the solvent annealing times are 2 h. The Inset in Fig. 2B is the Fourier transform of SFM image of Fig. 2B. The scale bars are 200 nm. Cahn-Hilliard-Cook and Landau-Ginzburg simulated morphologies of cylinder-forming AB diblock copolymer films with a thickness of (C), Δ = 1.0 L1 and (E), Δ = 1.1 L1 on the faceted pattern having a pitch size of λ = 1.7 L1, where L1 is a domain spacing of cylindrical microdomains, 2π/q∗. Regions of high density of A and B block are colored opaque maroon and translucent blue, respectively, and the saw-toothed substrate is represented by purple color. The morphologies in (D) and (F) are the lower half of the films of (C) and (E), respectively.