Fig. 4From: Fabrication of Ordered Nanopattern by using ABC Triblock Copolymer with Salt in TolueneAFM height images of PS-b-P2VP-b-PEO films spin-coated from 0.1 wt% polymer-LiCl toluene solution with various time scale of ultrasonic treatment when the molar ratio of Li+ ions to the total number of oxygen atoms (O) in PEO block and the nitrogen atoms (N) is 1:32.2: (a) 7.5 min, (b) 15 min, (c) 22.5 min, (d) 37.5 minBack to article page