| http://www.w3.org/ns/prov#value | - An apparatus, comprising: a substrate; a plurality of freestanding nanowires attached to the substrate, the nanowires each being monocrystalline and including at least one of gold and silver; and wherein the nanowires each include a respective free end, each have a first dimension of 500 nanometers or less, and each have a second dimension extending from the substrate to the respective free end, t
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