Fig. 6
Modification of the 4-MBA SAM during SERS analysis. a Typical 4-MBA spectra obtained from the same AuNP colloidal solution (pH = 7.4) at 1, 20, and 72 mW, normalized to the intensity detected at around 1068 cm−1. b–d Experimental intensities and band fitting in the range 980–1120 cm−1 from the spectra in a acquired at 1, 20, and 74 mW, respectively. In e–g, intensities and band fitting results are shown in the range 1350–1450 cm−1 as acquired at 1, 20, and 74 mW, respectively. h Comparison of the intensity band ratios (A + B)/C and (A + B)/(C + H) calculated at different outputs of the laser source, from the spectra shown in a
