Thickness-dependent morphologies of Ag on n-layer MoS sub(2) and its surface-enhanced Raman scattering

The size and density of Ag nanoparticles on n-layer MoS sub(2) exhibit thicknessdependent behavior. The size and density of these particles increased and decreased, respectively, with increasing layer number (n) of n-layer MoS sub(2). Furthermore, the surface-enhanced Raman scattering (SERS) of Ag on this substrate was observed. The enhancement factor of this scattering varied with the thickness of MoS sub(2). The mechanisms governing the aforementioned thickness dependences are proposed and discussed. [Figure not available: see fulltext.]