Surface enhanced Raman scattering of silver sensitized cobalt nanoparticles inmetal–dielectric nanocomposites

Abstract

We report the preparation of a new type of nanocomposite containing cobalt and silvernanoparticles organized in parallel layers with a well controlled separation. Thisarrangement allows the observation of an enhanced low-frequency Raman signal at thevibration frequency of cobalt nanoparticles excited through the surface plasmons of silvernanoparticles. Numerical simulations of the electric field confirm the emergence of hot spotswhen the separation between silver and cobalt nanoparticles is small enough.