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Effect of 4-MBA on SERS signal of SiO2@Au@4-MBA@Ag NPs at different concentrations in the range of 1 µM–1000 µM. (a) TEM images, (b) UV-Vis spectra, (c) Raman spectra, and (d) Raman signal plot of SiO2@Au@4-MBA@Ag. Error bar represents samples in triplicate.
