Fig. 3
From: Fabrication of Ordered Nanopattern by using ABC Triblock Copolymer with Salt in Toluene
AFM height images of PS-b-P2VP-b-PEO films spin-coated from 0.1 wt% toluene solution with different methods after the addition of LiCl-toluene 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) 1500 rpm stirring for 30 min at room temperature, (b) 1500 rpm stirring for 30 min at 75 °C, (c) ultrasonic treatment for 30 min at room temperature