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Keywords:

  • nanopipette writing;
  • self assembly;
  • rings;
  • nanostructures;
  • SERS;
  • metal nanoparticles
Thumbnail image of graphical abstract

A simple direct writing method using template-directed convective self-assembly is employed to fabricate concentric multi-ring structures of metallic nanoparticles. The concentric ring-type nanostructures, combined with a gold film, effectively induce a collective surface plasmon resonance, evidenced by a significant enhancement of the fluorescence intensities and Raman signals. This method opens possibilities for many advanced applications, including biosensing and nanophotonics.