HIGHLIGHTS
SUMMARY
The detected SERS signal results from the summation of many SM signals located within the probed surface area, both from hot-spot areas (where enhancement is maximal) and the rest of molecules located far from hot spots. The authors have shown how the SERS-mapping technique can be used to comprehensively study the spectra of large molecules, as well as calculate the percentage of the active substrate area that enhances the analyte spectra in the case of molecules with a diameter of several angstroms and a nanometer. The large area mapping and subfication of . . .
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