Figure 1From: New Colloidal Lithographic Nanopatterns Fabricated by Combining Pre-Heating and Reactive Ion EtchingSEM images of the PS particle monolayer (465 nm in diameter) after oxygen RIE for different time:a1–a4 0, 300, 450, 600 s, without preheating; andb1–b4 0, 300, 450, 700 s, with preheating, respectively. Thescale bar is 500 nm in each imageBack to article page