Figure 12.

SERS study on aqueous suspensions of MZF@sil@Au-MBA+MMC nanoparticles whose pH was adjusted in the range of 3–10 using diluted NaOH or HCl. (a) Raw (unprocessed) SERS spectra measured on aqueous suspensions with varying pH and (b) detail of the 1125–975 cm⁻¹ region normalized to the MMC band at 1056 cm⁻¹ with the pH-dependent intensity of the MBA band at 1077cm⁻¹. (c) The dependence of the ratio of Raman band intensities at 1077 cm⁻¹ and 1056 cm⁻¹ on pH, complemented by linear fit in the range of pH = 3–7.