Highly Stable Surface-Enhanced Raman Spectroscopy Substrates Using Few-Layer Graphene on Silver Nanoparticles

Figure 2

Typical SEM image showing (a) the as-prepared Ag nanoparticles on SiO₂ substrates, (b) few-layer graphene-encapsulated Ag nanoparticles, and (c) the agglomerated Ag nanoparticles after annealing process using a gas-phase carbon source (CH₄ gas).

(a)

(b)

(c)