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

Figure 6

Raman spectra obtained using R6G as a probing molecule. SERS spectra of R6G deposited (a) on the Ag nanoparticles without any protection for oxidation and (b) on the few-layer graphene-encapsulated Ag nanoparticles were measured. The measurement was performed before and after annealing process in ambient conditions and He-Ne laser (633 nm) was employed for the measurement. (c) Quantitative analysis of the change of the Raman intensity at 1363 cm⁻¹ according to the annealing process in the case where the bare Ag nanoparticles and the few-layer graphene-encapsulated Ag nanoparticles were used as SERS substrates.

(a)

(b)

(c)