Figure 2
From: A New Strategy of Lithography Based on Phase Separation of Polymer Blends
Top view of SEM images of porous PS film with different PS/PEG weight ratio.
The initial polymer blend concentration was set at 5 wt% and the spin speed was 4000 r min-1. (a) PS:PEG = 1:2; (b) PS:PEG = 1:2.5; (c) PS:PEG = 1:3; (d) PS:PEG = 1:4.
