Fig. 3

PS microspheres templates etched for 0 min (a), 5 min (b), 10 min (c), 15 min (d), 20 min (e), and 30 min (f). Displacement was observed for PS microspheres etched for 30 min, resulting in a disorder PS array. g–i The corresponding cross-linked networks after removing the PS microspheres templates etching for 15 min, 20 min, and 30 min. Networks could not be formed for templates etched less than 15 min, because the gap between two adjacent PS microspheres were too small