Onset of Intense Surface Enhanced Raman Scattering and Aggregation in the Au@Ag System

Figure 4

Extinction spectra of Au@Ag nanoparticle solutions as a function of added titrants (SERS labels): R6G, top; MPY, middle; and MBA, bottom. Titrant concentrations are color-coded as above and spectra were acquired concurrently with the Raman spectra.