Figure 5
(a) Raman intensity of R6G peaks at 613, 774 and 1360 cm−1 as a function of the molecular concentration on the Au@Ag/3D-Si substrate, in log scale. (b) SERS map of the R6G peaks at 613 cm−1 with concentration of 10−8 M on the Au@Ag/3D-Si substrate over 20 × 20 μm area. (c) Average SERS spectrum of the R6G from 8 positions on a same Au@Ag/3D-Si substrate (blue line). (d) Intensity distribution of the peak at 613 cm−1 from 8 different batches of Au@Ag/3D-Si substrates.
