A CORE-SHELL NANO PARTICLES

摘要

The present invention relates to core-shell nanoparticles comprising a first metal nanoparticle core, an oxide shell surrounding the first metal nanoparticle core, and a second metal nanoparticle positioned on the surface of the oxide shell. The ratio of the thickness of the oxide shell and the diameter of the second metal nanoparticle is greater than or equal to 1.74. By controlling the ratio of the thickness of the oxide shell and the diameter of the second metal nanoparticle, the nanoparticles can have enhanced Raman signals.