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(A–C) Synthesized GNPs function as SERS nanotag. (A) Raman spectra from GNPs of different sizes: black, grape extract; blue, spectrum from 14 ± 1 nm nanoparticles; pink, spectrum from 61 ± 2 nm particles. (B) Raman spectrum of R6G-doped GNPs: red, R6G-doped particles; black, R6G dye alone. (C) Stability of GNPs after long-term storage: black, 0 days; red, 30 days.
Abbreviations: GNPs, gold nanoparticles; SERS, surface-enhanced Raman scattering; R6G, rhodamine 6G; au, arbitrary unit.
