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Fabrication of hierarchical hairs with UV-curable PUA resin. (A) A schematic illustration for the fabrication of dual-scale hierarchical gecko-like hairs by 2-step UV-assisted capillary force lithography. (B) A titled SEM image of 2-level hierarchical PUA hairs formed over a large area. (C–G) Magnified, titled images of B, showing well-defined high-AR and angled nanohairs with bulged flat top formed on 5-μm pillars (5-μm spacing, 25-μm height).
