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(a) The UV/visible absorption spectra of the Ag-NPs, serum, and serum-Ag-NPs mixture. (b) SEM image of the surface morphology of Ag-NPs on the PSi substrate. (c) Raman spectrum of R6G (10−2 M) on the silicon wafer. (d) Spectral images of Ag sol mixed with serum in different ratios.
