A NERS-active structure is disclosed that includes at least one heterostructure nanowire. The at least one heterostructure nanowire may include alternating segments of an NERS-inactive material and a NERS-active material in an axial direction. Alternatively, the alternating segments may be of an NERS-inactive material and a material capable of attracting nanoparticles of a NERS-active material. In yet another alternative, the heterostructure nanowire may include a core with alternating coatings of an NERS-inactive material and a NERS-active material in a radial direction. A NERS system is also disclosed that includes a NERS-active structure. Also disclosed are methods for forming a NERS-active structure and methods for performing NERS with NERS-active structures.

 
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