Optimal Size of Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy under Different Conditions

Figure 2

(a) The UV-Vis spectra of gold NPs of different size. The absorbance was normalized for better comparison. (b) The change of maximum absorbance of 17 to 80 nm gold NPs over 4 weeks. The concentrations were 0.083 mM for 17 nm, 0.040 mM for 30 nm, 0.015 mM for 40 nm, 0.017 mM for 50 nm, 0.019 mM for 60 nm, and 0.028 mM for 80 nm.

(a)

(b)