Figure 5.

Effects of the thickness of the Ag shells on the geometries and the SERS effects of the core-satellite nanostructures. (a–d) Representative SEM images showing the nanostructures coated with the Ag shells using (a) 50 μl, (b) 100 μl, (c) 200 μl, and (d) 400 μl of 1 mM AgNO₃. (e) The average sizes of the Au-Ag core-shell satellite nanoparticles synthesized using different amounts of AgNO₃ (n = 20 per experimental condition). Error bars, SD. (f) The intensities of the characteristic Raman peak of adenine at 734 cm⁻¹ measured using the nanostructures that had the satellite nanoparticles of the sizes shown in (e) (n = 10 per experimental condition). Error bars, SD.