Figure 1.

A) Scheme and B) SEM image of MOSF@GNPs. C) UV–vis extinction spectra of MOSF and MOSF@GNPs in water. D) SERS response of 3‐MPBA adsorbed on MOSF@GNPs. E) Scheme showing oxidation of 3‐MPBA to 3‐HTP by H₂O₂ at GNP surface. F) SERS spectra of 3‐HTP and 3‐MPBA before and after addition of H₂O₂. G) SERS spectra of 3‐MPBA recorded from surface of MOSF@GNPs as a function of H₂O₂ concentration. H) Peak intensity ratios (I ₈₈₂/I ₉₉₈) of the spectra shown in (G) as a function of H₂O₂ concentration. The error bars represent the standard deviation obtained from the mean of triplicate measurements.