Figure 4

AFM phase images of a 32-nm-thick (=2.0L₀) PS₁₀₀-b-PMHxOHS₂₅ film cast from different solvents

(a–c) before annealing and (d–f) after annealing at 130 °C for 1 min. (a,d) Cast from a PGMEA solution. (b,e) Cast from a toluene solution. (c,f) Cast from a chloroform solution with a PMMA-r-PMA film.