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(a) SEM outline of gold nanocones fabricated over an area of more than 100 μm2. Polystyrene spheres with diameters decreased in an oxygen plasma were exploited as the mask. The magnified image presents the homogeneous hexagonal pattern of cones with individual grain boundaries and missing cones (b) Procedure (double layer and alumina mask) utilized to a silver film leads to sharp-tipped silver cones with a smaller tip aperture angle than for the gold cones [88].
