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SEM images of (a) silicon nanocone array, which were fabricated by the maskless etching in the ICP system, (b) the floral-clustered graphene nanosheets, which were grown on the nanocone array with the growth times of 30 minutes, (c) the high-resolution image of petaliform graphene nanosheets on the nanocone tips, (d) Ag nanoparticles attached to both sides of a graphene nanosheet.
