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Patterning high-curvature 3D objects with nanonets made from two layers of block copolymer. Side-view (a) and top-down (b and c) SEM images of 800 nm silica spheres draped with platinum nanonets obtained by metalization of two layers of aligned cylindrical C116 PS-b-P2VP crossed at ∼90°. Mechanically, the crossed meshes are more stable than single-layer arrays, which do not withstand plasma-ashing removal of the BCP template and tend to form bundles in the unsupported regions (d).
