Surface Plasmons and Surface Enhanced Raman Spectra of Aggregated and Alloyed Gold-Silver Nanoparticles

Figure 3

AFM scans and histograms of the two types of samples. (a) Annealed gold covered by annealed silver. (b) Gold covered by silver and annealed together. (c), (d) Histograms of the (a) and (b) samples, respectively.

(a)

(b)

(c)

(d)